聊聊动态强度和损伤演化

发布时间：2018-03-13 23:26

本文选题：动态强度　切入点：损伤演化　出处：《爆炸与冲击》2017年02期 　论文类型：期刊论文

【摘要】：材料强度在传统上常理解为材料在外载荷下抵抗流动/变形和破断的能力。由流变阶段到貌似突发的破断,其实源于一个隐含的应变率/时间相关的损伤演化过程。动态损伤演化研究的难点在于损伤与流变总是耦合在一起发展的。研究发现,热激活损伤演化模型可成功描述材料宏观损伤的动态演化。在此基础上,从实测的含损伤演化的表观应力应变曲线,可将两者解耦分开,并可确定各自相关的材料参数。这一思路可推广到中医脉诊的客观化研究,通过脉搏波信息定量反演脉搏波系统的正常及病态本构关系,可诊断生命体偏离正常状态的程度(病情),这可视为一种广义的损伤演化和强度问题。上述思路还可推广到地震预报研究,即"对地球把脉"。与加卸载响应比理论相结合,通过相邻3处的地震波信息来反演地球相关板块含损伤演化的非线性载荷-响应曲线,再区分出损伤演化程度,将有利于改进地震预报,这可视为另一种广义的损伤演化和强度问题。
[Abstract]:The strength of materials is traditionally understood as the ability of materials to resist flow / deformation and fracture under external loading. The difficulty of dynamic damage evolution is that the damage and rheology always develop together. Thermal activation damage evolution model can successfully describe the dynamic evolution of macroscopic damage of materials. On this basis, the two can be decoupled from the measured apparent stress-strain curves with damage evolution. This idea can be extended to the objective study of pulse diagnosis in traditional Chinese medicine, and the normal and pathological constitutive relations of pulse wave system can be quantitatively retrieved by pulse wave information. The degree to which the life body deviates from the normal state can be diagnosed as a generalized problem of damage evolution and strength. The above idea can also be extended to the study of earthquake prediction, that is, "looking at the earth's pulse" and combining with the theory of load-unloading response ratio. The nonlinear load-response curves of the Earth's related plates with damage evolution can be retrieved by the seismic wave information at the adjacent three places, and the degree of damage evolution can be distinguished, which will be helpful to improve the earthquake prediction. This can be seen as another generalized problem of damage evolution and strength.
【作者单位】：宁波大学省部共建教育部冲击与安全工程重点实验室;中国科学技术大学中国科学院材料力学行为和设计重点实验室;宁波市中医医院王晖工作室;
【分类号】：O346

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