The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform

Dai Gil Lee - One of the best experts on this subject based on the ideXlab platform.

  • Torque transmission capabilities of adhesively bonded tubular Lap Joints for composite drive shafts
    Composite Structures, 1995
    Co-Authors: Won-Seock Kim, Dai Gil Lee
    Abstract:

    The stresses and torque transmission capabilities of adhesively bonded circular, hexagonal and elliptical Lap Joints were analyzed by the three-dimensional finite element method and compared with the experimental results. The adherends of the Joints were composed of carbon fiber epoxy composite shafts and steel shafts. In calculating the torque transmission capabilities, the linear laminate properties of the composite material and the nonlinear shear properties of the adhesive were used. Using this method, the torque transmission capabilities of the adhesively bonded Lap Joints could be calculated accurately, except the circular and the hexagonal single Lap Joints whose adherends were failed by bulging when the composite adherends had small stacking angles from the shaft axis. The experiments revealed that the hexagonal Joint had the best torque transmission capability among the single Lap Joints, and the Double Lap Joint had better torque transmission capability than the single Lap Joint. The torque transmission capability of the hexagonal single Lap Joint was found to be comparable to that of the circular Double Lap Joint. ?? 1995.

  • Optimal tubular adhesive-bonded Lap Joint of the carbon fiber epoxy composite shaft
    Composite Structures, 1992
    Co-Authors: Ki-soo Kim, Won-Seock Kim, Dai Gil Lee, Eui Jin Jun
    Abstract:

    The effects of adhesive thickness and adherend surface roughness on the fatigue strength of the tubular adhesive-bonded single Lap Joint were experimentally investigated using small fatigue test specimens (??21 mm) whose adherends were made of S45C carbon steel. From the fatigue experiments, it was found that the optimal arithmetic surface roughness of the adherends was about 2 ??m and the optimal adhesive thickness was about 0??15 mm. Also, the manufacturing method of the adhesive-bonded tubular single Lap Joint was discussed for the reliable and optimal Joint quality. Using the optimal adhesive thickness and the optimal adherend roughness, the prototype torsional adhesive Joints for the power transmission shafts (??66 mm) of an automotive or a small helicopter were manufactured and statically tested under torque. The tests were performed on the single Lap Joint, the single Lap Joint with scarf, the Double Lap Joint, and the Double Lap Joint with scarf. The one part of the adherend of the Joint was made of high strength carbon fiber epoxy composite material and the other part of the adherend was made of S45C carbon steel. The stresses of Joints were analyzed by the finite element method. In applying the finite element method to the composite adherends, the smeared laminate properties were used. From the experiments, it was found that the Double Lap Joint was the best among the Joints in terms of torque capacity as well as manufacturing cost. ?? 1992.

K Drechsler - One of the best experts on this subject based on the ideXlab platform.

  • novel method for determination of critical fiber length in short fiber carbon carbon composites by Double Lap Joint
    Composites Part B-engineering, 2013
    Co-Authors: Daniel Heim, Mathias Peter Hartmann, Johannes Neumayer, Christian Klotz, Omer Ahmettsaous, S Zaremba, K Drechsler
    Abstract:

    Abstract A novel approach is introduced for the experimental determination of critical fiber length in carbon fiber reinforced carbon (CFRC) composites. Critical fiber length is investigated using Double Lap Joint samples. The transition of failure mode from bonding failure to fiber fraction with increasing overLap length correlates with the critical fiber length. Tested overLap lengths were in the range of 4–100 mm. For CFRC at hand, failure mode changes at an overLap length of 26 ± 2 mm. Hence critical fiber length is derived as lc = 52 ± 4 mm.

  • Novel method for determination of critical fiber length in short fiber carbon/carbon composites by Double Lap Joint
    Composites Part B-engineering, 2013
    Co-Authors: Daniel Heim, Mathias Peter Hartmann, Johannes Neumayer, Christian Klotz, S Zaremba, Ömer Ahmet-tsaous, K Drechsler
    Abstract:

    Abstract A novel approach is introduced for the experimental determination of critical fiber length in carbon fiber reinforced carbon (CFRC) composites. Critical fiber length is investigated using Double Lap Joint samples. The transition of failure mode from bonding failure to fiber fraction with increasing overLap length correlates with the critical fiber length. Tested overLap lengths were in the range of 4–100 mm. For CFRC at hand, failure mode changes at an overLap length of 26 ± 2 mm. Hence critical fiber length is derived as lc = 52 ± 4 mm.

Won-Seock Kim - One of the best experts on this subject based on the ideXlab platform.

  • Torque transmission capabilities of adhesively bonded tubular Lap Joints for composite drive shafts
    Composite Structures, 1995
    Co-Authors: Won-Seock Kim, Dai Gil Lee
    Abstract:

    The stresses and torque transmission capabilities of adhesively bonded circular, hexagonal and elliptical Lap Joints were analyzed by the three-dimensional finite element method and compared with the experimental results. The adherends of the Joints were composed of carbon fiber epoxy composite shafts and steel shafts. In calculating the torque transmission capabilities, the linear laminate properties of the composite material and the nonlinear shear properties of the adhesive were used. Using this method, the torque transmission capabilities of the adhesively bonded Lap Joints could be calculated accurately, except the circular and the hexagonal single Lap Joints whose adherends were failed by bulging when the composite adherends had small stacking angles from the shaft axis. The experiments revealed that the hexagonal Joint had the best torque transmission capability among the single Lap Joints, and the Double Lap Joint had better torque transmission capability than the single Lap Joint. The torque transmission capability of the hexagonal single Lap Joint was found to be comparable to that of the circular Double Lap Joint. ?? 1995.

  • Optimal tubular adhesive-bonded Lap Joint of the carbon fiber epoxy composite shaft
    Composite Structures, 1992
    Co-Authors: Ki-soo Kim, Won-Seock Kim, Dai Gil Lee, Eui Jin Jun
    Abstract:

    The effects of adhesive thickness and adherend surface roughness on the fatigue strength of the tubular adhesive-bonded single Lap Joint were experimentally investigated using small fatigue test specimens (??21 mm) whose adherends were made of S45C carbon steel. From the fatigue experiments, it was found that the optimal arithmetic surface roughness of the adherends was about 2 ??m and the optimal adhesive thickness was about 0??15 mm. Also, the manufacturing method of the adhesive-bonded tubular single Lap Joint was discussed for the reliable and optimal Joint quality. Using the optimal adhesive thickness and the optimal adherend roughness, the prototype torsional adhesive Joints for the power transmission shafts (??66 mm) of an automotive or a small helicopter were manufactured and statically tested under torque. The tests were performed on the single Lap Joint, the single Lap Joint with scarf, the Double Lap Joint, and the Double Lap Joint with scarf. The one part of the adherend of the Joint was made of high strength carbon fiber epoxy composite material and the other part of the adherend was made of S45C carbon steel. The stresses of Joints were analyzed by the finite element method. In applying the finite element method to the composite adherends, the smeared laminate properties were used. From the experiments, it was found that the Double Lap Joint was the best among the Joints in terms of torque capacity as well as manufacturing cost. ?? 1992.

Daniel Heim - One of the best experts on this subject based on the ideXlab platform.

  • novel method for determination of critical fiber length in short fiber carbon carbon composites by Double Lap Joint
    Composites Part B-engineering, 2013
    Co-Authors: Daniel Heim, Mathias Peter Hartmann, Johannes Neumayer, Christian Klotz, Omer Ahmettsaous, S Zaremba, K Drechsler
    Abstract:

    Abstract A novel approach is introduced for the experimental determination of critical fiber length in carbon fiber reinforced carbon (CFRC) composites. Critical fiber length is investigated using Double Lap Joint samples. The transition of failure mode from bonding failure to fiber fraction with increasing overLap length correlates with the critical fiber length. Tested overLap lengths were in the range of 4–100 mm. For CFRC at hand, failure mode changes at an overLap length of 26 ± 2 mm. Hence critical fiber length is derived as lc = 52 ± 4 mm.

  • Novel method for determination of critical fiber length in short fiber carbon/carbon composites by Double Lap Joint
    Composites Part B-engineering, 2013
    Co-Authors: Daniel Heim, Mathias Peter Hartmann, Johannes Neumayer, Christian Klotz, S Zaremba, Ömer Ahmet-tsaous, K Drechsler
    Abstract:

    Abstract A novel approach is introduced for the experimental determination of critical fiber length in carbon fiber reinforced carbon (CFRC) composites. Critical fiber length is investigated using Double Lap Joint samples. The transition of failure mode from bonding failure to fiber fraction with increasing overLap length correlates with the critical fiber length. Tested overLap lengths were in the range of 4–100 mm. For CFRC at hand, failure mode changes at an overLap length of 26 ± 2 mm. Hence critical fiber length is derived as lc = 52 ± 4 mm.

Anthony M Waas - One of the best experts on this subject based on the ideXlab platform.

  • a bonded Joint finite element for a symmetric Double Lap Joint subjected to mechanical and thermal loads
    International Journal for Numerical Methods in Engineering, 2009
    Co-Authors: Peter A Gustafson, Anthony M Waas
    Abstract:

    SUMMARY A bonded Joint finite element (FE) for a symmetric Double Lap Joint is developed that is capable of predicting field quantities in the Lap region. The element is a hybrid method and incorporates features of classical analytical and numerical methods. The element stiffness and load vector formulations have unique, load dependent, non-linear shape functions based on an analytical solution. The adaptive shape functions are formulated in terms of the dimensionless mechanical load fraction ( ¯ P) and total load ( ¯ tot) and are capable of predicting the thermal and mechanical load response. The bonded Joint element has been implemented as a user element in the Abaqus R � commercial FE code. A comparison of the stress predictions for the bonded Joint element and a conventional 2D FE model is presented and are found to be in good agreement. Therefore, the element provides a computationally efficient and mesh-independent stress prediction. The single element reproduces the analytical solution with minimal analyst input and can be easily incorporated into early design and sizing studies. Copyright q 2009 John Wiley & Sons, Ltd.

  • a macroscopic finite element for a symmetric Double Lap Joint subjected to mechanical and thermal loading
    48th AIAA ASME ASCE AHS ASC Structures Structural Dynamics and Materials Conference, 2007
    Co-Authors: Peter A Gustafson, Anthony M Waas
    Abstract:

    A thermo-mechanical analytical model and a corresponding macroscopic bonded Joint finite element is presented for the analysis of orthotropic Double Lap Joints subjected to combined thermal-mechanical loads. The analytical solution offers an improvement in accuracy over its predecessor, at the cost of increased solution complexity. However, to facilitate the use of this solution, it has been incorporated into a macroscopic bonded Joint finite element. The single element reproduces the analytical solution with minimal analyst input, and therefore can be easily incorporated into early design studies. The macroscopic element provides a computationally efficient and mesh independent comparative stress result. To validate the element, the stress predictions of the single element are compared with a continuum finite element model.