Shear behavior of woven and non-crimp fabric based thermoplastic composites at near-processing conditions

2020 ◽  
Vol 185 ◽  
pp. 107761 ◽  
Author(s):  
Tobias Mattner ◽  
Michael Wrensch ◽  
Dietmar Drummer
Keyword(s):  
Shear Behavior ◽  
Thermoplastic Composites ◽  
Processing Conditions

scholarly journals Modeling Shear Behavior of Woven Fabric Thermoplastic Composites for Crash Simulations

2020 ◽  
Vol 27 (6) ◽  
pp. 739-765
Author(s):  
Bilal Ahmad ◽  
Xiangfan Fang
Keyword(s):  
Damage Mechanics ◽  
Pure Shear ◽  
Fem Simulation ◽  
Shear Behavior ◽  
Woven Fabric ◽  
Bending Test ◽  
Thermoplastic Composites ◽  
Fiber Direction ◽  
Single Element ◽  
Full Potential

AbstractWoven fabric thermoplastic composites possess high specific strength and stiffness along with thermoformability. To utilize the full potential of these materials to achieve better crash-safe designs in automotive structural parts, the measurement of non-linear shear behavior and its material modeling for FEM simulations is required. The standard testing method was used to measure the pure shear behavior of woven fabric composites. These results were compared with the shear behavior of material in the presence of normal stresses along the fiber direction. Tensile and compression cyclic testing of ± 45° laminate were carried out to measure the stiffness degradation and hardening of the material in the presence of tensile normal and compression normal stress. A methodology is proposed for taking into account the differences in shear behavior under different loading directions in an FEM simulation. Based on the experimental evidence, improvements in the mathematical description of plasticity and damage in continuum damage mechanics models are proposed. The model was implemented as a user-defined material subroutine (VUMAT) for Abaqus. The experimental results from coupon tests were used to verify the results of a single element simulation. Finally, a three-point bending test was used to validate the predictions of the user material model.

Intraply Shearing Characterization of Thermoplastic Composite Materials in Thermoforming Processes

2012 ◽  
Vol 504-506 ◽  
pp. 243-248 ◽  
Author(s):  
Peng Wang ◽  
Nahiene Hamila ◽  
Philippe Boisse
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Shear Behavior ◽  
Mechanical Analysis ◽  
Polyphenylene Sulfide ◽  
Thermoplastic Composite ◽  
Thermoplastic Composites ◽  
Thermoplastic Resin ◽  
Plane Shear ◽  
Significant Difference

The Continuous Fibre Reinforcements and Thermoplastic resin (CFRTP) are widely employed in the prepreg processes. Currently, the most used thermoplastic resins in aeronautics are PPS (polyphenylene sulfide) and PEEK (Polyetheretherketone). They present many advantages on their mechanical properties. However, these mechanical properties depend strongly upon the thermoforming conditions, especially the intraply shearing. In order to improve and complete the understanding about the in-plane shear behavior of thermoplastic composite materials in their forming processes, the thermo-mechanical analysis of PPS/carbon and PEEK/carbon commingled fabrics at different forming temperatures are performed by using the bias-extension tests. The experimental data leads to significant difference on the in-plane shear behavior under different temperature, as well as the wrinkles can be noted in certain thermoforming conditions. Therefore, in order to predict the feasible forming conditions and optimize the important forming parameters of the thermoplastic composites, the in-plan shear behaviors in function of temperature will be integrated into our numerical model to carry out the numerical simulations of thermoforming processes.

scholarly journals A Study on Processing Conditions of Thermoplastic Composites with Commingled Yarn

Seikei-Kakou ◽  
1991 ◽  
Vol 3 (2) ◽  
pp. 157-164
Author(s):  
Hiroyuki HAMADA ◽  
Zen-ichiro MAEKAWA ◽  
Atsushi YOKOYAMA ◽  
Naoto IKEGAWA ◽  
Tatsuki MATSUO ◽  
...  
Keyword(s):  
Thermoplastic Composites ◽  
Processing Conditions ◽  
Commingled Yarn

Formation of defects in implanted hipox-structures

1992 ◽  
Vol 50 (2) ◽  
pp. 1406-1407
Author(s):  
Peter Pegler ◽  
N. David Theodore ◽  
Ming Pan
Keyword(s):  
High Pressure ◽  
Cross Section ◽  
Semiconductor Devices ◽  
Silicon Substrates ◽  
Processing Conditions ◽  
Pressure Oxidation ◽  
Deep Trench ◽  
Local Oxidation ◽  
Trench Isolation ◽  
And Behavior

High-pressure oxidation of silicon (HIPOX) is one of various techniques used for electrical-isolation of semiconductor-devices on silicon substrates. Other techniques have included local-oxidation of silicon (LOCOS), poly-buffered LOCOS, deep-trench isolation and separation of silicon by implanted oxygen (SIMOX). Reliable use of HIPOX for device-isolation requires an understanding of the behavior of the materials and structures being used and their interactions under different processing conditions. The effect of HIPOX-related stresses in the structures is of interest because structuraldefects, if formed, could electrically degrade devices.This investigation was performed to study the origin and behavior of defects in recessed HIPOX (RHIPOX) structures. The structures were exposed to a boron implant. Samples consisted of (i) RHlPOX'ed strip exposed to a boron implant, (ii) recessed strip prior to HIPOX, but exposed to a boron implant, (iii) test-pad prior to HIPOX, (iv) HIPOX'ed region away from R-HIPOX edge. Cross-section TEM specimens were prepared in the <110> substrate-geometry.

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