Stress wave effects and their mechanisms on stress-strain curves in the elastic phase of SHPB tests

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
GAO Guangfa
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Abstract

In Split Hopkinson Pressure Bar (SHPB) tests, the stress wave effects during the elastic phase of the stress-strain curve and their influence mechanisms are crucial. Due to the extremely short duration of the elastic deformation phase, the stress wave effects on the specimen during this stage cannot be ignored. This leads to significant errors in the obtained elastic stress-strain curves. However, the dynamic compressive elastic stress-strain relationship forms the basis for studying the viscoelastic behavior of materials. Accurate determination of elastic yield stress and yield strain is also essential for deriving accurate plastic stress-strain relationships. Quantitative research on the stress wave effects during the elastic compression phase of SHPB tests is fundamental for decoupling and obtaining accurate material elastic curves. This paper conducts a quantitative theoretical analysis of the structural effects caused by stress wave evolution during the elastic compression phase, based on the assumption of plane waves. It studies the deviation characteristics and main factors of the phenomenological engineering stress-strain curves of the specimen compared to the actual material stress-strain curves under different conditions, revealing the influence rules and mechanisms of this deviation. The maximum stress deviation value and its corresponding dimensionless time, as well as the variation trend of the maximum stress deviation value within different fluctuation intervals, are calculated. Additionally, the study investigates the cases where the incident wave is arc-shaped or a combination of arc and linear waves. The findings provide theoretical references for the precise design and accurate data processing of SHPB tests.

应力波效应及其对 SHPB 试验弹性阶段应力-应变曲线的影响机制
在分离式霍普金森压力棒(SHPB)试验中,应力-应变曲线弹性阶段的应力波效应及其影响机制至关重要。由于弹性变形阶段的持续时间极短,因此在此阶段试样上的应力波效应不容忽视。这将导致所获得的弹性应力应变曲线出现重大误差。然而,动态压缩弹性应力-应变关系是研究材料粘弹性行为的基础。准确测定弹性屈服应力和屈服应变对于推导精确的塑性应力应变关系也至关重要。对 SHPB 试验弹性压缩阶段的应力波效应进行定量研究,是解耦和获得准确材料弹性曲线的基础。本文基于平面波假设,对弹性压缩阶段应力波演变引起的结构效应进行了定量理论分析。研究了不同条件下试样的工程应力-应变现象曲线与实际材料应力-应变曲线的偏差特征和主要因素,揭示了这种偏差的影响规律和机理。计算了最大应力偏差值及其对应的无量纲时间,以及最大应力偏差值在不同波动区间内的变化趋势。此外,研究还探讨了入射波为弧形波或弧形波与直线波组合的情况。研究结果为 SHPB 试验的精确设计和准确数据处理提供了理论参考。
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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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