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Numerical simulation the stress uniformity in split Hopkinson pressure bar testing

机译：数值模拟拆分升降机压力条试验中的应力均匀性

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摘要

The assumption of uniform stress in a test specimen is fundamental to SHPB test technique. In the present paper, a numerical simulation of wave propagation in SHPB is performed to validate the assumption. A one-dimensional model based on CSPM is firstly developed. Then the wave propagations in SHPB with various area ratios of bar/specimen are simulated. The results show that the condition of stress uniformity is not satisfied, especially at the beginning of wave propagation. For the large area specimen, the stress tends to be uniform. While for the small area specimen, the non-uniformity of stress is more apparent.
机译：试样中均匀应力的假设是SHPB测试技术的基础。在本文中，执行SHPB中波传播的数值模拟以验证假设。首先开发了基于CSPM的一维模型。然后，模拟了具有各种区域比的SHPB中的波传播。结果表明，不满足应力均匀性的条件，特别是在波传播的开始时。对于大面积样品，应力趋于均匀。虽然对于小区域标本，但压力的不均匀性更加明显。

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