• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Composites >Quasi-static and dynamic fracture of graphite/epoxy composites: An optical study of loading-rate effects
【24h】

Quasi-static and dynamic fracture of graphite/epoxy composites: An optical study of loading-rate effects

机译：石墨/环氧树脂复合材料的准静态和动态断裂：加载速率效应的光学研究

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

Strain-rate effects on fracture behavior of unidirectional composite materials are studied. Single-edge notched multi-layered unidirectional graphite composites (T800/3900-2) are investigated to examine fracture responses under static and dynamic loading conditions using a digital speckle correlation method. The fracture parameters for growing cracks are extracted as a function of fiber orientation. A 2D digital image correlation (DIC) method is used to obtain time-resolved full-field in-plane surface displacements when specimens are subjected to quasi-static and impact loading. Stress intensity factor and crack extension histories for pure mode-I and mixed mode cases are extracted from the full-field displacements. When compared to the dynamic stress intensity factors at crack initiation, the static values are found to be consistently lower. The stress intensity factor histories exhibit a monotonic reduction under dynamic loading conditions whereas an increasing trend is seen after crack initiation under quasi-static loading cases. This is potentially due to dominant crack face fiber bridging effects in the latter cases.
机译：研究了应变速率对单向复合材料断裂行为的影响。研究了单边缘缺口多层单向石墨复合材料（T800 / 3900-2），以使用数字散斑相关方法检查在静态和动态载荷条件下的断裂响应。提取裂纹扩展的断裂参数作为纤维取向的函数。当样品经受准静态和冲击载荷时，使用2D数字图像相关（DIC）方法获得时间分辨的全场平面内表面位移。从全场位移中提取纯模式I和混合模式情况下的应力强度因子和裂纹扩展历史。当与裂纹萌生时的动态应力强度因子进行比较时，发现静态值始终较低。应力强度因子的历史记录在动态载荷条件下呈单调减少，而在准静态载荷情况下裂纹萌生后出现增加趋势。这可能是由于在后一种情况下主要的裂纹面纤维桥接效应所致。

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