Multilevel Analysis of Strain Rate Effect on Visco-Damage Evolution in Short Random Fiber Reinforced Polymer Composites

2021 ◽  
Vol 36 (2) ◽  
pp. 213-218
Author(s):  
M. D. D. Boudiaf ◽  
L. Hemmouche ◽  
M. A. Louar ◽  
A. May ◽  
N. Mesrati
Keyword(s):  
Strain Rate ◽  
Damage Evolution ◽  
Glass Fibers ◽  
Rate Sensitivity ◽  
Polymeric Composite ◽  
Tensile Tests ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Fiber Reinforced ◽  
Stress Levels

Abstract In this study, the strain rate sensitivity of a discontinuous short fiber reinforced composite and the strain rate effect on the damage evolution are investigated. The studied material is a polymeric composite with a polyamide 6.6 matrix reinforced with oriented randomly short glass fibers at a 50% weigh ratio (PA6.6GF50). Tensile tests at low and high strain rate are conducted. In addition, interrupted tensile tests are carried out to quantify the damage at specific stress levels and strain rates. To perform the interrupted tensile tests, an intermediate fixture is realized via double notched mechanical fuses with different widths designed to break at suitable stress levels. The damage is estimated by the fraction of debonded fibers and matrix fractures. Based on the experimental observations, it is concluded that the ultimate stress and strain, and the damage threshold are mainly governed by the strain rate. Furthermore, it is established that the considered composite has a non-linear dynamic behavior with a viscous damage nature.

High Strain Rate Tensile Behavior of Carbon Fiber Reinforced Aluminum Laminates

2005 ◽  
Author(s):  
Yuanxin Zhou ◽  
Pingwen Mao ◽  
Mohammad F. Uddin ◽  
Shaikh Jeelani
Keyword(s):  
Carbon Fiber ◽  
Strain Rate ◽  
Rate Sensitivity ◽  
Tensile Tests ◽  
Strain Rate Range ◽  
Fiber Reinforced ◽  
Stress Strain ◽  
Static Tensile ◽  
Carbon Fiber Reinforced ◽  
Good Agreement

In this paper, loading and loading-unloading tests of carbon fiber reinforced aluminum laminates (CRALL) have been carried out in a tensile impact apparatus, and quasi-static tensile tests have been performed on a MTS-810 machine. Complete stress-strain curves of composite in the strain rate range from 0.001–1200 1/s have been obtained. Experimental results show that CRALL composite is a strain rate sensitivity material, the tensile strength and failure strain both increased with increasing strain rate. A linear strain hardening model has been combined with Weibull distribution function to establish a constitutive equation for CRALL. The simulated stress-strain curves from model are in good agreement with the test data. The analysis of the model shows that the Weibull scale parameter, σ0, increased with increasing strain rate, but Weibull shape parameter, β, can be regarded as a constant.

scholarly journals Modification of the Johnson-cook Model for the Strain Rate Effect On Tensile Properties of 304/316 Austenitic Stainless Steels

2021 ◽  
Author(s):  
Jun-Min Seo ◽  
Sang-Seop Jeong ◽  
Yun-Jae Kim ◽  
Jin Weon Kim ◽  
Chang-Young Oh ◽  
...  
Keyword(s):  
Plastic Strain ◽  
Strain Rate ◽  
Tensile Properties ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Tensile Tests ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Strain And Strain Rate ◽  
Cook Model

Abstract In this study, tensile tests of 304 and 316 austenitic stainless steels at various strain rate were performed to investigate the strain rate effect on tensile properties. It is shown that the strain rate effect on stress depends not only on the strain rate but also on the plastic strain level. Accordingly, a modification of the existing Johnson-Cook model is proposed to incorporate the interacting effect of plastic strain and strain rate for 304 and 316 austenitic stainless steels. Although improvement is not significant, the proposed modified Johnson-Cook model can reduce the difference from the experimental data at various strain levels, compared to the existing Johnson-Cook model.

Investigating Strain Rate Effect on Transverse Compressive Strength of Fiber Composites

2006 ◽  
Vol 306-308 ◽  
pp. 733-738 ◽  
Author(s):  
Jia Lin Tsai ◽  
Jui Ching Kuo
Keyword(s):  
Compressive Strength ◽  
Strain Rate ◽  
Shear Failure ◽  
Split Hopkinson Pressure Bar ◽  
Rate Sensitivity ◽  
Fiber Composites ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Epoxy Composites ◽  
Hopkinson Pressure Bar

This research aims to investigate strain rate effect on transverse compressive strength of unidirectional fiber composites. Both glass/epoxy and graphite/epoxy composites were taken into account in this study. To demonstrate strain rate effect, composite brick specimens were fabricated and tested to failure in the transverse direction at strain rate ranges from 10-4/s to 500/s. For strain rate less than 1/s, the experiments were conducted by a hydraulic MTS machine. However, the higher strain rate tests were performed using a Split Hopkinson Pressure Bar (SHPB). Experimental observations reveal that the transverse compressive strengths increase corresponding to the increment of the strain rates. A semi-logarithmic function was employed to describe the rate sensitivity of the transverse compressive strength. SEM photographic on the failure surfaces depicts that for glass/epoxy composites, the failure mechanism is mainly due to the matrix shear failure, however, for the graphite/epoxy composites, it becomes the fiber and epoxy interfacial debonding which could dramatically reduce the transverse compressive strengths of the fiber composites.

scholarly journals Numerical Simulation Study on Strain Rate Effect of Fiber Reinforced Composites

2020 ◽  
Author(s):  
Hui Ye ◽  
Chang Liu ◽  
Yanrong Zhu
Keyword(s):  
Constitutive Model ◽  
Strain Rate ◽  
Composite Laminates ◽  
Model Simulation ◽  
Strain Rate Effect ◽  
Rate Effect ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Simulation Results

Abstract In order to study the effect of strain rate effect on the simulation precision of fiber reinforced composites, the dynamic enhancement factor (DIF) was introduced to modify the modulus and strength of the composite, and the modified Hashin failure criterion was used to establish a three-dimensional progressive damage constitutive model of composite materials which could consider the strain rate effect. The model is embedded into the Abaqus software by VUMAT subroutine, and the simulation of the projectile penetrating the fiberglass reinforced composite laminates is carried out. The simulation results are compared with the experimental results and the constitutive model simulation results without considering the strain rate effect. The results show that the constitutive model with strain rate established in this paper can accurately simulate the process of projectile penetrating the laminates. Compared with the simulation results without strain rate, the accuracy is increased in the model with strain rate, respectively by 14.1% at the penetration speed of 1.8 m/s and by 22.7% at 3 m/s. The errors, between the simulation results of without strain rate and that of the experiments, are increased with the increase of penetration speed, and increase from 28.7% of 1.8 m/s to 36.9% of 3 m/s. The simulation error of constitutive model with strain rate is relatively stable.

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