The Experts below are selected from a list of 58794 Experts worldwide ranked by ideXlab platform
Christian P Deck - One of the best experts on this subject based on the ideXlab platform.
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quantifying the three dimensional damage and stress redistribution mechanisms of braided sic sic Composites by in situ volumetric digital image correlation
Scripta Materialia, 2017Co-Authors: Brendan P Croom, Peng Xu, Edward Jean Lahoda, Christian P Deck, Xiaodong LiAbstract:Abstract Coupled in situ micro-X-ray computed tomography and volumetric digital image correlation (V-DIC) strain measurements of expanding plug tests revealed the three-dimensional, microstructure-dependent mechanisms behind strain localization, damage initiation and stress redistribution in braided SiC/SiC Composites. Hoop strain varied significantly through the Composite Thickness and was highest at regions of tow crossover; at higher loads, tow fracture initiated at these locations, and sample rupture propagated axially by connecting points of tow overlap. Finally, strain measurements after the failure of a tow on the interior surface quantified the three-dimensional stress redistribution mechanisms and damage tolerance of the SiC/SiC Composite.
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Quantifying the three-dimensional damage and stress redistribution mechanisms of braided SiC/SiC Composites by in situ volumetric digital image correlation
Scripta Materialia, 2017Co-Authors: Brendan P Croom, Edward Jean Lahoda, Christian P DeckAbstract:Abstract Coupled in situ micro-X-ray computed tomography and volumetric digital image correlation (V-DIC) strain measurements of expanding plug tests revealed the three-dimensional, microstructure-dependent mechanisms behind strain localization, damage initiation and stress redistribution in braided SiC/SiC Composites. Hoop strain varied significantly through the Composite Thickness and was highest at regions of tow crossover; at higher loads, tow fracture initiated at these locations, and sample rupture propagated axially by connecting points of tow overlap. Finally, strain measurements after the failure of a tow on the interior surface quantified the three-dimensional stress redistribution mechanisms and damage tolerance of the SiC/SiC Composite.
Brendan P Croom - One of the best experts on this subject based on the ideXlab platform.
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quantifying the three dimensional damage and stress redistribution mechanisms of braided sic sic Composites by in situ volumetric digital image correlation
Scripta Materialia, 2017Co-Authors: Brendan P Croom, Peng Xu, Edward Jean Lahoda, Christian P Deck, Xiaodong LiAbstract:Abstract Coupled in situ micro-X-ray computed tomography and volumetric digital image correlation (V-DIC) strain measurements of expanding plug tests revealed the three-dimensional, microstructure-dependent mechanisms behind strain localization, damage initiation and stress redistribution in braided SiC/SiC Composites. Hoop strain varied significantly through the Composite Thickness and was highest at regions of tow crossover; at higher loads, tow fracture initiated at these locations, and sample rupture propagated axially by connecting points of tow overlap. Finally, strain measurements after the failure of a tow on the interior surface quantified the three-dimensional stress redistribution mechanisms and damage tolerance of the SiC/SiC Composite.
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Quantifying the three-dimensional damage and stress redistribution mechanisms of braided SiC/SiC Composites by in situ volumetric digital image correlation
Scripta Materialia, 2017Co-Authors: Brendan P Croom, Edward Jean Lahoda, Christian P DeckAbstract:Abstract Coupled in situ micro-X-ray computed tomography and volumetric digital image correlation (V-DIC) strain measurements of expanding plug tests revealed the three-dimensional, microstructure-dependent mechanisms behind strain localization, damage initiation and stress redistribution in braided SiC/SiC Composites. Hoop strain varied significantly through the Composite Thickness and was highest at regions of tow crossover; at higher loads, tow fracture initiated at these locations, and sample rupture propagated axially by connecting points of tow overlap. Finally, strain measurements after the failure of a tow on the interior surface quantified the three-dimensional stress redistribution mechanisms and damage tolerance of the SiC/SiC Composite.
F. Teixeira-dias - One of the best experts on this subject based on the ideXlab platform.
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Optimisation of thin-walled hybrid vertical struts for crashworthy aircraft designs
Structural and Multidisciplinary Optimization, 2019Co-Authors: J. Paz, L. Romera, J Diaz, F. Teixeira-diasAbstract:This research concerns the crashworthiness enhancement of a model of a Boeing 737-200 fuselage section. Using a validated numerical specimen, four thin-walled crushable hybrid energy absorbers are added to the aircraft to work as vertical struts. The absorbers are composed of a hollow aluminium tube, a star-shaped glass fibre–reinforced polymer inner matrix and foam extrusions. The absorbers—with variable tube edge and Thickness, Composite Thickness and core height—are single- and multi-objectively optimised. Surrogate models and genetic algorithms are used for the minimisation of acceleration loads, injury levels and the strut’s weight. Results yield a more efficient frames’ collapse evolution with plastic dissipation increased by over 50%. Consequently, acceleration peaks are up to 50% lower at the two measured locations while maintaining low mass values. Injury levels were also reduced from severe to moderate according to an Eiband diagram.
Seung-hwan Chang - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of modeling techniques for a type III hydrogen pressure vessel (70 MPa) made of an aluminum liner and a thick carbon/epoxy Composite for fuel cell vehicles
International Journal of Hydrogen Energy, 2012Co-Authors: Seung-hwan ChangAbstract:Abstract Stress distributions in the Composite layers of a Type III hydrogen pressure vessel composed of a thin aluminum liner (5 mm) and a thick Composite laminate (45 mm) were calculated by using three different modeling techniques. The results were analyzed and compared with the plausible stress distribution calculated by a full ply-based modeling technique. A laminate-based modeling technique underestimated the generated stresses especially at the border between the cylinder and dome parts. A hybrid modeling technique combining a laminate-based modeling for the dome part with a ply-based modeling for the cylinder part was also tried, but it overestimated the generated stresses at the border. In order for the ply-based modeling technique to carry out precise analysis, a fiber trajectory function for the dome part was derived and the Composite Thickness variation was also considered.
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Determination of the autofrettage pressure and estimation of material failures of a Type III hydrogen pressure vessel by using finite element analysis
International Journal of Hydrogen Energy, 2012Co-Authors: Dae-sung Son, Jin-ho Hong, Seung-hwan ChangAbstract:Abstract The autofrettage process of a Type III hydrogen pressure vessel for fuel cell vehicles with preset winding pattern was simulated by finite element analysis (FEA). For a precise finite element analysis, the ply based modeling technique was used for the Composite layers; a contour function was derived for the fibers at the dome part to determine the exact winding angle; and the exact Composite Thickness was also considered. In order to determine the most appropriate autofrettage pressure, stress analysis of the pressure vessel according to its internal pressure was carried out with consideration of the international regulations about pressure vessel design. The minimum stress ratio, the permanent volumetric expansion and the generated residual stress were investigated, and the failure of the pressure vessel under minimum burst pressure was predicted by application of various failure criteria of anisotropic Composites.
Xiaodong Li - One of the best experts on this subject based on the ideXlab platform.
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quantifying the three dimensional damage and stress redistribution mechanisms of braided sic sic Composites by in situ volumetric digital image correlation
Scripta Materialia, 2017Co-Authors: Brendan P Croom, Peng Xu, Edward Jean Lahoda, Christian P Deck, Xiaodong LiAbstract:Abstract Coupled in situ micro-X-ray computed tomography and volumetric digital image correlation (V-DIC) strain measurements of expanding plug tests revealed the three-dimensional, microstructure-dependent mechanisms behind strain localization, damage initiation and stress redistribution in braided SiC/SiC Composites. Hoop strain varied significantly through the Composite Thickness and was highest at regions of tow crossover; at higher loads, tow fracture initiated at these locations, and sample rupture propagated axially by connecting points of tow overlap. Finally, strain measurements after the failure of a tow on the interior surface quantified the three-dimensional stress redistribution mechanisms and damage tolerance of the SiC/SiC Composite.