Instrumented single-shot experiments provide crucial information of a material's response to impact events that can be used in shot-peening modelling. However, no authors successfully used such test for constitutive model identification and validation as existing test rig generally cannot provide an accurate determination of the shot trajectory in three dimensions over a wide velocity range. In this work, a shot-peening test rig that can propel single shot under the process conditions with a high aiming accuracy is presented. The test rig propels industrial shot by sudden pressurised gas release. A methodology to recover the propelled shot three-dimensional trajectory within a 200-μm accuracy using two high-frequency cameras is developed in an open-source in-house code. The test rig can propel 0.5-, 1.19- and 2.5-mm-diameter shot at velocity ranging from 0.8 to 143 m s⁻¹ and can send several shots at the same position when using the largest shot diameter. Two potential applications of the set-up are presented for (i) coefficient of restitution measurement with different shooting angles and velocities and (ii) crystal plasticity finite element model validation using the impact dent topology, the shot displacement curve and the crystal misorientation field under the dent.

中文翻译：

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用于高应变率下材料塑性行为表征的受控单次和重复冲击试验

仪器化的单次射击实验提供了材料对冲击事件的响应的关键信息，可用于喷丸强化建模。然而，没有作者成功地将此类测试用于本构模型识别和验证，因为现有的测试设备通常无法在较宽的速度范围内准确确定三个维度的射击轨迹。在这项工作中，提出了一种喷丸强化试验台，它可以在工艺条件下以高瞄准精度推进单发。试验台通过突然的加压气体释放来推动工业射击。一种使用两个高频相机在 200 微米精度内恢复推进射击的三维轨迹的方法是在开源内部代码中开发的。测试台可以推动 0.5-、1.19- 和 2。^-1并且在使用最大弹丸直径时可以在同一位置发送多个弹丸。提出了该装置的两个潜在应用，用于 (i) 不同射击角度和速度下的恢复系数测量和 (ii) 使用冲击凹痕拓扑、射击位移曲线和晶体错误取向场的晶体塑性有限元模型验证凹痕。