纳秒脉冲激光诱导冲击波作用下TC17钛合金高应变率本构模型参数辨识

发布时间：2018-04-10 16:11

  本文选题：激光器 + 本构模型　； 参考：《中国激光》2016年08期

【摘要】：基于Johnson-Cook(J-C)本构模型,提出了基于有限元模型和修正Levenberg-Marquard(L-M)算法的参数辨识方法。对TC17材料进行不同参数、不同工艺的激光冲击,得到了高应变率条件下的残余应力场分布;利用霍普金森压杆得到了中应变率条件下TC17材料的动态响应曲线;将上述两个测试结果作为辨识目标。引入低应变率条件下材料的响应曲线作为约束条件,辨识得到了TC17钛合金高应变率条件下的J-C本构模型参数。实验和计算结果对比验证表明,辨识得到的参数能比较准确地描述TC17钛合金材料高应变率条件下的动态响应规律,并预测激光冲击条件下材料的残余应力场分布。
[Abstract]:Based on the Johnson-Cookg J-C) constitutive model, a parameter identification method based on the finite element model and the modified Levenberg-MarquardL-M algorithm is proposed.The distribution of residual stress field at high strain rate was obtained by laser shock with different parameters and processes for TC17 materials, and the dynamic response curves of TC17 materials at medium strain rate were obtained by using Hopkinson pressure bar.The above two test results are used as identification targets.The J-C constitutive model parameters under the condition of high strain rate for TC17 titanium alloy were identified by introducing the response curve of the material at low strain rate as the constraint condition.The comparison of experimental and computational results shows that the identified parameters can accurately describe the dynamic response of TC17 titanium alloy under high strain rate and predict the distribution of residual stress field under laser shock.
【作者单位】： 空军工程大学等离子体动力学重点实验室;
【基金】：国家973计划(2015CB057400) 国家自然科学基金(51505496,51305456)
【分类号】：V252.2;V261.8
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本文编号：1731946