Analysis on the turning point of dynamic in-plane compressive strength for a plain weave composite

• Published in: Defence technology 2024-02, Vol.32, p.485-495
• Main Authors: Wang, Xiaoyu, Li, Zhixing, Guo, Licheng, Wang, Zhenxin, Zhao, Jiuzhou
• Format: Article
• Language: English
• Subjects: Dynamic strength; Failure mechanism; Plain weave composite; Quantitative criterion; Turning point
• ISSN: 2214-9147; 2214-9147
• DOI: 10.1016/j.dt.2023.04.005

Experimental investigations on dynamic in-plane compressive behavior of a plain weave composite were performed using the split Hopkinson pressure bar. A quantitative criterion for calculating the constant strain rate of composites was established. Then the upper limit of strain rate, restricted by stress equilibrium and constant loading rate, was rationally estimated and confirmed by tests. Within the achievable range of 0.001/s–895/s, it was found that the strength increased first and subsequently decreased as the strain rate increased. This feature was also reflected by the turning point (579/s) of the bilinear model for strength prediction. The transition in failure mechanism, from local opening damage to completely splitting destruction, was mainly responsible for such strain rate effects. And three major failure modes were summarized under microscopic observations: fiber fracture, inter-fiber fracture, and interface delamination. Finally, by introducing a nonlinear damage variable, a simplified ZWT model was developed to characterize the dynamic mechanical response. Excellent agreement was shown between the experimental and simulated results. [Display omitted] •A criterion for calculating the constant strain rate of composites is established.•The upper limit of strain rate in SHPB tests was rationally estimated.•A turning point of the strain rate effects is found.•The transition of failure mechanism explains the change in strength.•A viscoelastic model with damage is developed to characterize mechanical response.