关于 HJC 模型中的应变速率效应

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Impact Engineering Pub Date : 2024-10-02 DOI:10.1016/j.ijimpeng.2024.105132
Baiyu Chen, Q.M. Li
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引用次数: 0

摘要

本文评估了 HJC 模型中的应变率效应。通过比较 HJC 模型和 KC 模型的应变率效应,结果表明 HJC 模型的确定和实施程序导致了较小的应变率效应。文中讨论了 HJC 模型应变速率效应确定过程中存在的一些问题,即 "向左 "压力校正、过于简化的强度曲线和跨域应力数据的使用,这些问题导致应变速率常数 C 被低估。根据高压数据确定的应变速率效应比根据单轴压缩数据确定的应变速率效应要大,这有助于进一步研究与压力相关的应变速率效应。
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About the strain-rate effect in HJC model
The strain-rate effect in HJC model is evaluated in this paper. Based on a comparison of strain-rate effects between the HJC and KC models, it shows that the determination and implementation procedures in the HJC model lead to smaller strain-rate effect. Some problems on the determination of strain-rate effect in the HJC model, i.e. the utilisations of the ‘leftward’ pressure correction, over-simplified strength curve and the cross-domain stress data, are discussed, which cause the underestimation of the strain-rate constant C. A more logical and practically-applicable ‘rightward’ pressure correction method is proposed to determine the strain-rate effect in the HJC model. The strain-rate effect determined from the high-pressure data is larger than that determined from the uniaxial compressive data, which facilitate further study on the pressure-dependent strain-rate effect.
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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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