软材料 SHPB 实验中统一变形框架下径向惯性和摩擦效应的修正方法与验证

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
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引用次数: 0

摘要

在分体式霍普金森压力棒(SHPB)实验中,由于严重的径向惯性和摩擦效应,可能会产生显著的测量误差。以往的研究针对这两种效应开发了各种校正方法。然而,这些方法存在过度依赖试样体积不变性假设、对两种效应的变形模式假设不一致等问题,限制了其普遍性和有效性。因此,本文通过合理的假设,将径向惯性效应和摩擦效应整合到统一的变形框架中,并提出了一种将试样从复杂应力状态校正到单轴应力状态的方法。SHPB 数值模拟实验证明,该方法可有效消除径向惯性和摩擦对弹性和粘弹性材料测量结果的综合影响,包括与这两个因素相关的尺寸效应。此外,本文还提出了一种方案,在试样和棒材之间的摩擦系数未知的情况下,利用试样的尺寸效应确定摩擦系数。最后,应用该方法修正了不同直径硅橡胶 SHPB 实验中测得的应力。它成功消除了不同尺寸试样之间应力-应变关系的差异,并确定了合理范围内的摩擦系数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Correction method and verification of radial inertia and friction effects under a unified deformation framework in SHPB experiments on soft materials
During the split Hopkinson pressure bar (SHPB) experiments, significant measurement errors can arise due to severe radial inertia and friction effects. Previous studies have developed various correction methods for these two effects. However, these methods have problems such as over-reliance on the volume invariance assumption of the specimen and inconsistent assumptions on the deformation patterns of the two effects, which limit their universality and effectiveness. Therefore, this paper integrates the radial inertia effect and friction effect in a unified deformation framework through reasonable assumptions, and proposes a method to correct the specimen from a complex stress state to a uniaxial stress state. SHPB numerical simulation experiments demonstrate that this method effectively eliminates the combined effects of radial inertia and friction on measurement results for both elastic and viscoelastic materials, including the size effect associated with these two factors. Additionally, the paper presents a scheme to determine the friction coefficient using the size effect of the specimens when the friction coefficient between the specimen and the bar is unknown. Finally, the method was applied to correct the stresses measured in SHPB experiments on silicone rubber of different diameters. It successfully eliminated discrepancies in the stress-strain relationships between specimens of various sizes and determined a friction coefficient that fell within a reasonable range.
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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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