• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Fatigue and fracture mechanics >Study of an On-Line Crack Compliance Technique for Residual Stress Measurement Using 2D Finite Element Simulations of Fatigue Crack Growth
【24h】

Study of an On-Line Crack Compliance Technique for Residual Stress Measurement Using 2D Finite Element Simulations of Fatigue Crack Growth

机译：基于疲劳裂纹扩展的二维有限元模拟的残余应力在线裂纹顺应性技术研究

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

There are several methods available to measure residual stress fields present within a structural component. Recently a new so called on-line crack compliance technique has been proposed, which is based on linear elastic fracture mechanics. This experimental method uses incremental crack mouth opening displacements measured during fatigue crack growth testing to generate information on the existing residual stresses along the crack line. The present study employs two dimensional (2D) plane stress finite element simulations of fatigue crack growth from a cold worked hole to investigate the performance of this technique. Using the simulation results, the stress intensity factors due to the residual stress field normalized by the maximum applied stress intensity factor K_(lrs)/K_(lmax) were obtained from the online crack compliance method. For validation, the J-integral approach was used to calculate K_(lrs)/K_(lmax) values from fatigue crack growth simulations in an elastic material. The two methods generated nearly identical results. Fatigue crack growth was also simulated in an elastic-plastic material. Even though the stress intensity factor is not the appropriate crack tip characterizing technique for elastic-plastic material conditions, it is still investigated here to approximate the actual testing conditions, where plastic deformation near the crack tip is unavoidable. The K_(lrs)/K_(lmax) solutions are presented for different cold work levels and applied loadings. Results indicate that the agreement between the elastic and elastic-plastic crack growth solutions is dependent on the maximum applied loading level, as might be expected.
机译：有几种方法可用来测量结构部件内存在的残余应力场。最近，已经提出了一种新的在线裂缝顺应性技术，该技术基于线性弹性断裂力学。该实验方法使用在疲劳裂纹扩展测试过程中测得的增量裂纹张口位移来生成沿裂纹线的现有残余应力的信息。本研究采用二维（2D）平面应力有限元模拟疲劳裂纹从冷加工孔的生长，以研究该技术的性能。使用模拟结果，通过在线裂纹顺应性方法获得了归因于残余应力场的应力强度因子，该残余应力场由最大施加应力强度因子K_（lrs）/ K_（lmax）归一化。为了进行验证，使用J积分方法根据弹性材料中的疲劳裂纹扩展模拟来计算K_（lrs）/ K_（lmax）值。两种方法产生的结果几乎相同。在弹塑性材料中还模拟了疲劳裂纹扩展。尽管应力强度因子不是弹塑性材料条件下合适的裂纹尖端表征技术，但仍在这里进行研究，以逼近不可避免的裂纹尖端附近塑性变形的实际测试条件。针对不同的冷作水平和所施加的载荷，提出了K_（lrs）/ K_（lmax）解决方案。结果表明，弹性裂纹和弹塑性裂纹扩展解决方案之间的一致性取决于所预期的最大施加载荷水平。

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