The Experts below are selected from a list of 159 Experts worldwide ranked by ideXlab platform

Ming C Liu - One of the best experts on this subject based on the ideXlab platform.

  • Bolt Bearing Strength of Commingled Boron/Glass Fiber Reinforced Aluminum Laminates
    Volume 3: Design Materials and Manufacturing Parts A B and C, 2012
    Co-Authors: Poching Yeh, Poyu Chang, Jennming Yang, Ming C Liu
    Abstract:

    The bearing properties of recently developed hybrid fiber/metal laminates, or COmmingled Boron/glass fiber Reinforced Aluminum laminates (COBRA), are investigated in this study. The bolt-type bearing tests on GLass REinforced aluminum laminates (GLARE), non-commingled hybrid Boron/glass/aluminum fiber/metal laminates (HFML) and COBRA were carried out as a function of e/D ratio, metal volume fraction, fiber volume fraction, and fiber orientation.Experimental results show that with the same joint geometry and metal volume fraction, the commingling of Boron Fibers improves the bearing strength of fiber/metal laminates. The bearing strength of COBRA with longitudinal Fibers is lower than that with transverse Fibers due to the fact that shearout failure takes place before maximum bearing strength is reached. The experimental results show that, with only either transverse fiber orientation or longitudinal fiber orientation, COBRA with 18% Boron fiber volume fraction possesses a higher bearing strength when compared to HFML with 6% Boron fiber volume fraction. In addition to the properties in COBRA with parallel-plies commingled prepreg, the bearing properties of various COBRA with [0°/90°] and [0°/90°/90°/0°] cross-ply commingled prepregs are also discussed.© 2012 ASME

  • Bearing strength of commingled Boron/glass fiber reinforced aluminum laminates
    Composite Structures, 2012
    Co-Authors: Poching Yeh, Poyu Chang, Jennming Yang, Justin Wang, Ming C Liu
    Abstract:

    Abstract The bearing properties of recently developed hybrid fiber/metal laminates, or COmmingled Boron/glass fiber Reinforced Aluminum laminates (COBRA), are investigated in this study. The bolt-type bearing tests on GLass REinforced aluminum laminates (GLARE), non-commingled hybrid Boron/glass/aluminum fiber/metal laminates (HFML) and COBRA were carried out as a function of e / D ratio, metal volume fraction, fiber volume fraction, and fiber orientation. Experimental results show that with the same joint geometry and metal volume fraction, the commingling of Boron Fibers improves the bearing strength of fiber/metal laminates. Observations show the Boron/glass fiber prepreg, transverse to the loading direction, results in a bearing mechanism that effectively increases the bearing strength. The bearing strength of COBRA with longitudinal Fibers is lower than that with transverse Fibers due to the fact that shearout failure takes place before maximum bearing strength is reached. The experimental results show that, with only either transverse fiber orientation or longitudinal fiber orientation, COBRA with 18% Boron fiber volume fraction possesses a higher bearing strength when compared to HFML with 6% Boron fiber volume fraction. In addition to the properties in COBRA with parallel-plies commingled prepreg, the bearing properties of various COBRA with [0°/90°] and [0°/90°/90°/0°] cross-ply commingled prepregs are also discussed.

  • blunt notch strength of hybrid Boron glass aluminum fiber metal laminates
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2011
    Co-Authors: Poching Yeh, Poyu Chang, Jennming Yang, Ming C Liu
    Abstract:

    The notch strength of high modulus hybrid fiber/metal laminates (FMLs) was investigated. The composite layers used in this material, which contain both Boron Fibers and S2-glass Fibers, were adhesively bonded to 2024-T3 aluminum sheets and consolidated using an autoclave process. The results of tensile tests clearly showed that high modulus FMLs with a good ductility can be achieved by mingling of Boron and glass Fibers. The effects of notch sizes and constituents on the failure behavior were determined. The experiments showed that the notched hybrid FMLs exhibited excellent strength retaining characteristics even with the presence of large notches. Microscopy, X-ray radiography and chemical removal technique were used to examine the fracture characteristics of hybrid FMLs. A finite element analysis (FEA) model was established to analyze the notch behavior of hybrid FMLs. Experimental results of the blunt-notch strength are in good agreement with the stresses calculated by computational modeling of hybrid FMLs.

Poching Yeh - One of the best experts on this subject based on the ideXlab platform.

  • Bolt Bearing Strength of Commingled Boron/Glass Fiber Reinforced Aluminum Laminates
    Volume 3: Design Materials and Manufacturing Parts A B and C, 2012
    Co-Authors: Poching Yeh, Poyu Chang, Jennming Yang, Ming C Liu
    Abstract:

    The bearing properties of recently developed hybrid fiber/metal laminates, or COmmingled Boron/glass fiber Reinforced Aluminum laminates (COBRA), are investigated in this study. The bolt-type bearing tests on GLass REinforced aluminum laminates (GLARE), non-commingled hybrid Boron/glass/aluminum fiber/metal laminates (HFML) and COBRA were carried out as a function of e/D ratio, metal volume fraction, fiber volume fraction, and fiber orientation.Experimental results show that with the same joint geometry and metal volume fraction, the commingling of Boron Fibers improves the bearing strength of fiber/metal laminates. The bearing strength of COBRA with longitudinal Fibers is lower than that with transverse Fibers due to the fact that shearout failure takes place before maximum bearing strength is reached. The experimental results show that, with only either transverse fiber orientation or longitudinal fiber orientation, COBRA with 18% Boron fiber volume fraction possesses a higher bearing strength when compared to HFML with 6% Boron fiber volume fraction. In addition to the properties in COBRA with parallel-plies commingled prepreg, the bearing properties of various COBRA with [0°/90°] and [0°/90°/90°/0°] cross-ply commingled prepregs are also discussed.© 2012 ASME

  • Bearing strength of commingled Boron/glass fiber reinforced aluminum laminates
    Composite Structures, 2012
    Co-Authors: Poching Yeh, Poyu Chang, Jennming Yang, Justin Wang, Ming C Liu
    Abstract:

    Abstract The bearing properties of recently developed hybrid fiber/metal laminates, or COmmingled Boron/glass fiber Reinforced Aluminum laminates (COBRA), are investigated in this study. The bolt-type bearing tests on GLass REinforced aluminum laminates (GLARE), non-commingled hybrid Boron/glass/aluminum fiber/metal laminates (HFML) and COBRA were carried out as a function of e / D ratio, metal volume fraction, fiber volume fraction, and fiber orientation. Experimental results show that with the same joint geometry and metal volume fraction, the commingling of Boron Fibers improves the bearing strength of fiber/metal laminates. Observations show the Boron/glass fiber prepreg, transverse to the loading direction, results in a bearing mechanism that effectively increases the bearing strength. The bearing strength of COBRA with longitudinal Fibers is lower than that with transverse Fibers due to the fact that shearout failure takes place before maximum bearing strength is reached. The experimental results show that, with only either transverse fiber orientation or longitudinal fiber orientation, COBRA with 18% Boron fiber volume fraction possesses a higher bearing strength when compared to HFML with 6% Boron fiber volume fraction. In addition to the properties in COBRA with parallel-plies commingled prepreg, the bearing properties of various COBRA with [0°/90°] and [0°/90°/90°/0°] cross-ply commingled prepregs are also discussed.

  • blunt notch strength of hybrid Boron glass aluminum fiber metal laminates
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2011
    Co-Authors: Poching Yeh, Poyu Chang, Jennming Yang, Ming C Liu
    Abstract:

    The notch strength of high modulus hybrid fiber/metal laminates (FMLs) was investigated. The composite layers used in this material, which contain both Boron Fibers and S2-glass Fibers, were adhesively bonded to 2024-T3 aluminum sheets and consolidated using an autoclave process. The results of tensile tests clearly showed that high modulus FMLs with a good ductility can be achieved by mingling of Boron and glass Fibers. The effects of notch sizes and constituents on the failure behavior were determined. The experiments showed that the notched hybrid FMLs exhibited excellent strength retaining characteristics even with the presence of large notches. Microscopy, X-ray radiography and chemical removal technique were used to examine the fracture characteristics of hybrid FMLs. A finite element analysis (FEA) model was established to analyze the notch behavior of hybrid FMLs. Experimental results of the blunt-notch strength are in good agreement with the stresses calculated by computational modeling of hybrid FMLs.

  • fatigue crack initiation in hybrid Boron glass aluminum fiber metal laminates
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008
    Co-Authors: Poyu Chang, Poching Yeh, Jennming Yang
    Abstract:

    Abstract The fatigue crack initiation behavior of a high modulus and hybrid Boron/glass/aluminum fiber/metal laminate (FML) was investigated experimentally and analytically. Two types of hybrid Boron/glass/aluminum FMLs were fabricated and studied, which consisted of aluminum alloy sheets as the metal layers and a mixture of Boron Fibers and glass Fibers as the composite layers. For the first type, the Boron fiber/prepreg and the glass fiber/prepreg were used separately in the composite layers, and for the second type, the Boron Fibers and the glass Fibers were mingled together to form a hybrid Boron/glass/prepreg composite layer. These hybrid FMLs were consolidated using an autoclave curing process. The incorporation of the Boron Fibers improved the Young's modulus of the composite layer in FMLs, which in turn, would improve the fatigue crack initiation life of the Al sheet. The experimental results clearly showed that the fatigue crack initiation lives for both types of hybrid Boron/glass/aluminum FMLs were superior to the monolithic aluminum alloy under the same loading condition. An analytical approach was proposed to calculate the fatigue crack initiation lives of hybrid Boron/glass/aluminum FMLs based on the classical laminate theory and the small-crack theory. A good correlation was obtained between the predictions and the experimental results.

  • Fatigue crack initiation in hybrid Boron/glass/aluminum fiber metal laminates
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008
    Co-Authors: Poyu Chang, Poching Yeh, Jennming Yang
    Abstract:

    Abstract The fatigue crack initiation behavior of a high modulus and hybrid Boron/glass/aluminum fiber/metal laminate (FML) was investigated experimentally and analytically. Two types of hybrid Boron/glass/aluminum FMLs were fabricated and studied, which consisted of aluminum alloy sheets as the metal layers and a mixture of Boron Fibers and glass Fibers as the composite layers. For the first type, the Boron fiber/prepreg and the glass fiber/prepreg were used separately in the composite layers, and for the second type, the Boron Fibers and the glass Fibers were mingled together to form a hybrid Boron/glass/prepreg composite layer. These hybrid FMLs were consolidated using an autoclave curing process. The incorporation of the Boron Fibers improved the Young's modulus of the composite layer in FMLs, which in turn, would improve the fatigue crack initiation life of the Al sheet. The experimental results clearly showed that the fatigue crack initiation lives for both types of hybrid Boron/glass/aluminum FMLs were superior to the monolithic aluminum alloy under the same loading condition. An analytical approach was proposed to calculate the fatigue crack initiation lives of hybrid Boron/glass/aluminum FMLs based on the classical laminate theory and the small-crack theory. A good correlation was obtained between the predictions and the experimental results.

David C. Dunand - One of the best experts on this subject based on the ideXlab platform.

  • Mechanisms and kinetics of MgB2 synthesis from Boron Fibers
    Acta Materialia, 2008
    Co-Authors: John D. Defouw, David C. Dunand
    Abstract:

    Abstract Superconducting MgB 2 Fibers were synthesized through the reaction of liquid magnesium with 140 μm diameter Boron Fibers. Fiber reaction occurs by two concurrent mechanisms. First, concentric MgB 2 , MgB 4 and MgB 7 shells grow radially into the B Fibers. Diffusion modeling provides rate constants and effective diffusion coefficients for the borides and their activation energies. Second, radial cracks form in the MgB 4 or MgB 7 shells, allowing for Mg ingress into the Fibers and diffusional growth of MgB 2 wedges in the radial and circumferential directions. Combining both shell and wedge MgB 2 growth mechanisms into a single model provides predictions of overall MgB 2 reaction kinetics as a function of time and temperature, which are in good agreement with in situ X-ray diffraction measurements performed at 885–1025 °C.

  • The Effect of Dopant Additions on the Microstructure of Boron Fibers Before and After Reaction to MgB2
    MRS Proceedings, 2004
    Co-Authors: James V. Marzik, Raymond J. Suplinskas, William J. Croft, Warren J. Moberlychan, John D. Defouw, David C. Dunand
    Abstract:

    Boron Fibers made by a commercial chemical vapor deposition (CVD) process have been used as precursors for the formation of magnesium diboride (MgB2) superconducting wires. Prior to a reaction with magnesium, the addition of dopants such as carbon and titanium to the Boron fiber has been shown to enhance the superconducting properties of MgB2. These dopants also influence the kinetics of the reaction with magnesium. In this study, the effect of carbon dopant additions on the microstructure of Boron Fibers was investigated using powder x-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Additionally, bundles of Boron Fibers were pressure infiltrated with molten magnesium and reacted at elevated temperatures. The microstructure and microchemistry of the fiber-metal interfaces were investigated by TEM and energy dispersive x-ray analysis (EDS).

Jennming Yang - One of the best experts on this subject based on the ideXlab platform.

  • Bolt Bearing Strength of Commingled Boron/Glass Fiber Reinforced Aluminum Laminates
    Volume 3: Design Materials and Manufacturing Parts A B and C, 2012
    Co-Authors: Poching Yeh, Poyu Chang, Jennming Yang, Ming C Liu
    Abstract:

    The bearing properties of recently developed hybrid fiber/metal laminates, or COmmingled Boron/glass fiber Reinforced Aluminum laminates (COBRA), are investigated in this study. The bolt-type bearing tests on GLass REinforced aluminum laminates (GLARE), non-commingled hybrid Boron/glass/aluminum fiber/metal laminates (HFML) and COBRA were carried out as a function of e/D ratio, metal volume fraction, fiber volume fraction, and fiber orientation.Experimental results show that with the same joint geometry and metal volume fraction, the commingling of Boron Fibers improves the bearing strength of fiber/metal laminates. The bearing strength of COBRA with longitudinal Fibers is lower than that with transverse Fibers due to the fact that shearout failure takes place before maximum bearing strength is reached. The experimental results show that, with only either transverse fiber orientation or longitudinal fiber orientation, COBRA with 18% Boron fiber volume fraction possesses a higher bearing strength when compared to HFML with 6% Boron fiber volume fraction. In addition to the properties in COBRA with parallel-plies commingled prepreg, the bearing properties of various COBRA with [0°/90°] and [0°/90°/90°/0°] cross-ply commingled prepregs are also discussed.© 2012 ASME

  • Bearing strength of commingled Boron/glass fiber reinforced aluminum laminates
    Composite Structures, 2012
    Co-Authors: Poching Yeh, Poyu Chang, Jennming Yang, Justin Wang, Ming C Liu
    Abstract:

    Abstract The bearing properties of recently developed hybrid fiber/metal laminates, or COmmingled Boron/glass fiber Reinforced Aluminum laminates (COBRA), are investigated in this study. The bolt-type bearing tests on GLass REinforced aluminum laminates (GLARE), non-commingled hybrid Boron/glass/aluminum fiber/metal laminates (HFML) and COBRA were carried out as a function of e / D ratio, metal volume fraction, fiber volume fraction, and fiber orientation. Experimental results show that with the same joint geometry and metal volume fraction, the commingling of Boron Fibers improves the bearing strength of fiber/metal laminates. Observations show the Boron/glass fiber prepreg, transverse to the loading direction, results in a bearing mechanism that effectively increases the bearing strength. The bearing strength of COBRA with longitudinal Fibers is lower than that with transverse Fibers due to the fact that shearout failure takes place before maximum bearing strength is reached. The experimental results show that, with only either transverse fiber orientation or longitudinal fiber orientation, COBRA with 18% Boron fiber volume fraction possesses a higher bearing strength when compared to HFML with 6% Boron fiber volume fraction. In addition to the properties in COBRA with parallel-plies commingled prepreg, the bearing properties of various COBRA with [0°/90°] and [0°/90°/90°/0°] cross-ply commingled prepregs are also discussed.

  • blunt notch strength of hybrid Boron glass aluminum fiber metal laminates
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2011
    Co-Authors: Poching Yeh, Poyu Chang, Jennming Yang, Ming C Liu
    Abstract:

    The notch strength of high modulus hybrid fiber/metal laminates (FMLs) was investigated. The composite layers used in this material, which contain both Boron Fibers and S2-glass Fibers, were adhesively bonded to 2024-T3 aluminum sheets and consolidated using an autoclave process. The results of tensile tests clearly showed that high modulus FMLs with a good ductility can be achieved by mingling of Boron and glass Fibers. The effects of notch sizes and constituents on the failure behavior were determined. The experiments showed that the notched hybrid FMLs exhibited excellent strength retaining characteristics even with the presence of large notches. Microscopy, X-ray radiography and chemical removal technique were used to examine the fracture characteristics of hybrid FMLs. A finite element analysis (FEA) model was established to analyze the notch behavior of hybrid FMLs. Experimental results of the blunt-notch strength are in good agreement with the stresses calculated by computational modeling of hybrid FMLs.

  • fatigue crack initiation in hybrid Boron glass aluminum fiber metal laminates
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008
    Co-Authors: Poyu Chang, Poching Yeh, Jennming Yang
    Abstract:

    Abstract The fatigue crack initiation behavior of a high modulus and hybrid Boron/glass/aluminum fiber/metal laminate (FML) was investigated experimentally and analytically. Two types of hybrid Boron/glass/aluminum FMLs were fabricated and studied, which consisted of aluminum alloy sheets as the metal layers and a mixture of Boron Fibers and glass Fibers as the composite layers. For the first type, the Boron fiber/prepreg and the glass fiber/prepreg were used separately in the composite layers, and for the second type, the Boron Fibers and the glass Fibers were mingled together to form a hybrid Boron/glass/prepreg composite layer. These hybrid FMLs were consolidated using an autoclave curing process. The incorporation of the Boron Fibers improved the Young's modulus of the composite layer in FMLs, which in turn, would improve the fatigue crack initiation life of the Al sheet. The experimental results clearly showed that the fatigue crack initiation lives for both types of hybrid Boron/glass/aluminum FMLs were superior to the monolithic aluminum alloy under the same loading condition. An analytical approach was proposed to calculate the fatigue crack initiation lives of hybrid Boron/glass/aluminum FMLs based on the classical laminate theory and the small-crack theory. A good correlation was obtained between the predictions and the experimental results.

  • Fatigue crack initiation in hybrid Boron/glass/aluminum fiber metal laminates
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008
    Co-Authors: Poyu Chang, Poching Yeh, Jennming Yang
    Abstract:

    Abstract The fatigue crack initiation behavior of a high modulus and hybrid Boron/glass/aluminum fiber/metal laminate (FML) was investigated experimentally and analytically. Two types of hybrid Boron/glass/aluminum FMLs were fabricated and studied, which consisted of aluminum alloy sheets as the metal layers and a mixture of Boron Fibers and glass Fibers as the composite layers. For the first type, the Boron fiber/prepreg and the glass fiber/prepreg were used separately in the composite layers, and for the second type, the Boron Fibers and the glass Fibers were mingled together to form a hybrid Boron/glass/prepreg composite layer. These hybrid FMLs were consolidated using an autoclave curing process. The incorporation of the Boron Fibers improved the Young's modulus of the composite layer in FMLs, which in turn, would improve the fatigue crack initiation life of the Al sheet. The experimental results clearly showed that the fatigue crack initiation lives for both types of hybrid Boron/glass/aluminum FMLs were superior to the monolithic aluminum alloy under the same loading condition. An analytical approach was proposed to calculate the fatigue crack initiation lives of hybrid Boron/glass/aluminum FMLs based on the classical laminate theory and the small-crack theory. A good correlation was obtained between the predictions and the experimental results.

Poyu Chang - One of the best experts on this subject based on the ideXlab platform.

  • Bolt Bearing Strength of Commingled Boron/Glass Fiber Reinforced Aluminum Laminates
    Volume 3: Design Materials and Manufacturing Parts A B and C, 2012
    Co-Authors: Poching Yeh, Poyu Chang, Jennming Yang, Ming C Liu
    Abstract:

    The bearing properties of recently developed hybrid fiber/metal laminates, or COmmingled Boron/glass fiber Reinforced Aluminum laminates (COBRA), are investigated in this study. The bolt-type bearing tests on GLass REinforced aluminum laminates (GLARE), non-commingled hybrid Boron/glass/aluminum fiber/metal laminates (HFML) and COBRA were carried out as a function of e/D ratio, metal volume fraction, fiber volume fraction, and fiber orientation.Experimental results show that with the same joint geometry and metal volume fraction, the commingling of Boron Fibers improves the bearing strength of fiber/metal laminates. The bearing strength of COBRA with longitudinal Fibers is lower than that with transverse Fibers due to the fact that shearout failure takes place before maximum bearing strength is reached. The experimental results show that, with only either transverse fiber orientation or longitudinal fiber orientation, COBRA with 18% Boron fiber volume fraction possesses a higher bearing strength when compared to HFML with 6% Boron fiber volume fraction. In addition to the properties in COBRA with parallel-plies commingled prepreg, the bearing properties of various COBRA with [0°/90°] and [0°/90°/90°/0°] cross-ply commingled prepregs are also discussed.© 2012 ASME

  • Bearing strength of commingled Boron/glass fiber reinforced aluminum laminates
    Composite Structures, 2012
    Co-Authors: Poching Yeh, Poyu Chang, Jennming Yang, Justin Wang, Ming C Liu
    Abstract:

    Abstract The bearing properties of recently developed hybrid fiber/metal laminates, or COmmingled Boron/glass fiber Reinforced Aluminum laminates (COBRA), are investigated in this study. The bolt-type bearing tests on GLass REinforced aluminum laminates (GLARE), non-commingled hybrid Boron/glass/aluminum fiber/metal laminates (HFML) and COBRA were carried out as a function of e / D ratio, metal volume fraction, fiber volume fraction, and fiber orientation. Experimental results show that with the same joint geometry and metal volume fraction, the commingling of Boron Fibers improves the bearing strength of fiber/metal laminates. Observations show the Boron/glass fiber prepreg, transverse to the loading direction, results in a bearing mechanism that effectively increases the bearing strength. The bearing strength of COBRA with longitudinal Fibers is lower than that with transverse Fibers due to the fact that shearout failure takes place before maximum bearing strength is reached. The experimental results show that, with only either transverse fiber orientation or longitudinal fiber orientation, COBRA with 18% Boron fiber volume fraction possesses a higher bearing strength when compared to HFML with 6% Boron fiber volume fraction. In addition to the properties in COBRA with parallel-plies commingled prepreg, the bearing properties of various COBRA with [0°/90°] and [0°/90°/90°/0°] cross-ply commingled prepregs are also discussed.

  • blunt notch strength of hybrid Boron glass aluminum fiber metal laminates
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2011
    Co-Authors: Poching Yeh, Poyu Chang, Jennming Yang, Ming C Liu
    Abstract:

    The notch strength of high modulus hybrid fiber/metal laminates (FMLs) was investigated. The composite layers used in this material, which contain both Boron Fibers and S2-glass Fibers, were adhesively bonded to 2024-T3 aluminum sheets and consolidated using an autoclave process. The results of tensile tests clearly showed that high modulus FMLs with a good ductility can be achieved by mingling of Boron and glass Fibers. The effects of notch sizes and constituents on the failure behavior were determined. The experiments showed that the notched hybrid FMLs exhibited excellent strength retaining characteristics even with the presence of large notches. Microscopy, X-ray radiography and chemical removal technique were used to examine the fracture characteristics of hybrid FMLs. A finite element analysis (FEA) model was established to analyze the notch behavior of hybrid FMLs. Experimental results of the blunt-notch strength are in good agreement with the stresses calculated by computational modeling of hybrid FMLs.

  • fatigue crack initiation in hybrid Boron glass aluminum fiber metal laminates
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008
    Co-Authors: Poyu Chang, Poching Yeh, Jennming Yang
    Abstract:

    Abstract The fatigue crack initiation behavior of a high modulus and hybrid Boron/glass/aluminum fiber/metal laminate (FML) was investigated experimentally and analytically. Two types of hybrid Boron/glass/aluminum FMLs were fabricated and studied, which consisted of aluminum alloy sheets as the metal layers and a mixture of Boron Fibers and glass Fibers as the composite layers. For the first type, the Boron fiber/prepreg and the glass fiber/prepreg were used separately in the composite layers, and for the second type, the Boron Fibers and the glass Fibers were mingled together to form a hybrid Boron/glass/prepreg composite layer. These hybrid FMLs were consolidated using an autoclave curing process. The incorporation of the Boron Fibers improved the Young's modulus of the composite layer in FMLs, which in turn, would improve the fatigue crack initiation life of the Al sheet. The experimental results clearly showed that the fatigue crack initiation lives for both types of hybrid Boron/glass/aluminum FMLs were superior to the monolithic aluminum alloy under the same loading condition. An analytical approach was proposed to calculate the fatigue crack initiation lives of hybrid Boron/glass/aluminum FMLs based on the classical laminate theory and the small-crack theory. A good correlation was obtained between the predictions and the experimental results.

  • Fatigue crack initiation in hybrid Boron/glass/aluminum fiber metal laminates
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008
    Co-Authors: Poyu Chang, Poching Yeh, Jennming Yang
    Abstract:

    Abstract The fatigue crack initiation behavior of a high modulus and hybrid Boron/glass/aluminum fiber/metal laminate (FML) was investigated experimentally and analytically. Two types of hybrid Boron/glass/aluminum FMLs were fabricated and studied, which consisted of aluminum alloy sheets as the metal layers and a mixture of Boron Fibers and glass Fibers as the composite layers. For the first type, the Boron fiber/prepreg and the glass fiber/prepreg were used separately in the composite layers, and for the second type, the Boron Fibers and the glass Fibers were mingled together to form a hybrid Boron/glass/prepreg composite layer. These hybrid FMLs were consolidated using an autoclave curing process. The incorporation of the Boron Fibers improved the Young's modulus of the composite layer in FMLs, which in turn, would improve the fatigue crack initiation life of the Al sheet. The experimental results clearly showed that the fatigue crack initiation lives for both types of hybrid Boron/glass/aluminum FMLs were superior to the monolithic aluminum alloy under the same loading condition. An analytical approach was proposed to calculate the fatigue crack initiation lives of hybrid Boron/glass/aluminum FMLs based on the classical laminate theory and the small-crack theory. A good correlation was obtained between the predictions and the experimental results.