• ISSN 1001-1455  CN 51-1148/O3
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聊聊动态强度和损伤演化

王礼立 胡时胜 杨黎明 董新龙 王晖

王礼立, 胡时胜, 杨黎明, 董新龙, 王晖. 聊聊动态强度和损伤演化[J]. 爆炸与冲击, 2017, 37(2): 169-179. doi: 10.11883/1001-1455(2017)02-0169-11
引用本文: 王礼立, 胡时胜, 杨黎明, 董新龙, 王晖. 聊聊动态强度和损伤演化[J]. 爆炸与冲击, 2017, 37(2): 169-179. doi: 10.11883/1001-1455(2017)02-0169-11
Wang Lili, Hu Shisheng, Yang Liming, Dong Xinlong, Wang Hui. Talk about dynamic strength and damage evolution[J]. Explosion And Shock Waves, 2017, 37(2): 169-179. doi: 10.11883/1001-1455(2017)02-0169-11
Citation: Wang Lili, Hu Shisheng, Yang Liming, Dong Xinlong, Wang Hui. Talk about dynamic strength and damage evolution[J]. Explosion And Shock Waves, 2017, 37(2): 169-179. doi: 10.11883/1001-1455(2017)02-0169-11

聊聊动态强度和损伤演化

doi: 10.11883/1001-1455(2017)02-0169-11
详细信息
    作者简介:

    王礼立(1934—),男,教授,博士生导师,wanglili@nbu.edu.cn

  • 中图分类号: O347

Talk about dynamic strength and damage evolution

  • 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。
  • 图  1  材料的率-温相关的动态力学行为之示意

    Figure  1.  Rate-temperature-dependent behaviors of materials

    图  2  PMMA不同应变率下的理论曲线与实验数据的对比

    Figure  2.  Comparisons between the experimental data and theoretical predictions for PMMA

    图  3  PP/PA共混高聚物BP神经网络预示曲线与实验曲线对比

    Figure  3.  Comparisons between the BP neural networks predictions and experimental data for PP/PA polymer blend

    图  4  PP/PA共混高聚物由BP神经网络确定的D=(ε, ${\mathit{\dot \varepsilon }}$)

    Figure  4.  The D=(ε, ${\mathit{\dot \varepsilon }}$) determined by the BP neural networks for PP/PA polymer blend

    图  5  计及损伤演化的材料率-温相关的动态力学行为的示意图

    Figure  5.  Rate-temperature dependent behavior of materialstaking account of damage evolution

    图  6  加卸载响应比概念之示意

    Figure  6.  Schematics of the concept of load-unload response ratio

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出版历程
  • 收稿日期:  2016-12-23
  • 修回日期:  2017-01-19
  • 刊出日期:  2017-03-25

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