...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Solids and Structures >On crack-tip cooling during dynamic crack initiation
【24h】

On crack-tip cooling during dynamic crack initiation

机译：动态裂纹萌生时的裂纹尖端冷却

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This paper presents a hybrid experimental-numerical treatment of the transient thermoelastic effects around a crack tip, subjected to a dynamic loading. A simple numerical procedure was devised to calculate the transient crack-tip temperature field, in a "one-way" coupled approach. The calculations were carried out in two steps: first the evolution of the volumetric strain is determined by solving the mechanical problem. Next, this strain is converted into a nodal heat generation rate to solve the associated thermal problem for the same geometry. This approach was validated through the comparison of simulated and experimentally determined crack-tip temperatures. The experiments were carried out on instrumented compact compression PMMA specimens. These numerical results confirm and extend previous results concerning crack-tip cooling effects (Rittel, D., 1998a. In: Durban, D., Pearson, J.R.A. (Eds.), IUTAM Symposium on Non-linear Singularities in Deformation and Flow. Kluwer Academic Publishers, Dordrecht, pp. 181-192, Rittel, D., 1998b. Int. J. Solids and Structures 35 (22), 2959-2973). They show the three-dimensional nature of the thermal field, with increased cooling effects at specimens mid-thickness. The present results also confirm that adiabatic conditions prevail during the initial stages of the dynamic fracture process. Finally, it is shown that the crack-rip cooling effect characterizes the response of linear thermoelastic materials, regardless of their thermal conductivity. (C) 2001 Published by Elsevier Science Ltd. [References: 23]
机译：本文提出了动态载荷作用下裂纹尖端周围瞬态热弹性效应的混合实验-数值处理。设计了一种简单的数值程序，以“单向”耦合方式计算瞬态裂纹尖端温度场。计算分两个步骤进行：首先，通过解决机械问题确定体积应变的演变。接下来，将该应变转换为节点生热速率，以解决相同几何形状的相关热问题。通过比较模拟和实验确定的裂纹尖端温度验证了该方法。实验是在仪器紧凑的压缩PMMA标本上进行的。这些数值结果证实并扩展了有关裂纹尖端冷却效应的先前结果（Rittel，D.，1998a。在：Durban，D.，Pearson，JRA（编辑），IUTAM变形和流动中的非线性奇异性研讨会）。 Academic Publishers，Dordrecht，第181-192页，Rittel，D.，1998b。Int。J. Solids and Structures 35（22），2959-2973。它们显示了热场的三维性质，在中厚样品处冷却效果增强。目前的结果还证实，在动态断裂过程的初始阶段绝热条件占主导地位。最后，结果表明，裂纹撕裂冷却效应表征了线性热弹性材料的响应，而与它们的导热性无关。 （C）2001年由Elsevier Science Ltd.出版[参考文献：23]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号