| 含偏置裂纹三点弯曲梁的动态断裂行为研究 |
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| 引用本文： | 姚学锋,熊春阳,方竞.含偏置裂纹三点弯曲梁的动态断裂行为研究[J].力学学报,1996,28(6):661-669. |
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| 作者姓名： | 姚学锋 熊春阳 方竞 |
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| 作者单位： | 清华大学工程力学系,北京 100084 |
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| 基金项目： | 国家自然科学基金,国家教委跨世纪人才计划项目资助 |
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| 摘 要： | 采用动态焦散线方法，对含偏置裂纹三点弯曲梁承受横向冲击的弯曲断裂行为进行了一系列动态断裂力学实验研究，分析了无量纲量ａ／ｌ的改变（ａ——初始裂纹偏离梁中心线的距离；ｌ——梁长度的一半）对于裂纹动态扩展行为（裂纹起始状态、裂纹尖端的复合应力强度因子、裂纹扩展速度、裂纹扩展轨迹）的影响，并借助动态光弹性应力分析，对应力波与扩展裂纹的相互作用以及应力波传播规律进行探讨．给出了裂纹尖端复合应力强度因子、裂纹扩展速度的变化、裂纹曲裂轨迹以及方向与梁中应力波传播的相互关系
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| 关 键 词： | 动态 光弹性 曲裂 应力强度因子 裂纹扩展 |
STUDY OF DYNAMIC FRACTURE BEHAVIOUR ON THREE POINT BEND BEAM WITH OFF CENTER EDGE CRACK |
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| Yao Xuefeng,Xiong Chunyang,Fang Jing.STUDY OF DYNAMIC FRACTURE BEHAVIOUR ON THREE POINT BEND BEAM WITH OFF CENTER EDGE CRACK[J].chinese journal of theoretical and applied mechanics,1996,28(6):661-669. |
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| Authors: | Yao Xuefeng Xiong Chunyang Fang Jing |
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| Abstract: | A series of experimental studies on the dynamic fracture behaviour of three point bend beam with off center edge crack under transverse implusive loading are presented with the help of dynamic caustics. The effects of the off center position of the prefabricated cracks on dynamic growth (i.e. the crack initiation, the mixed mode stress intensity factor of the crack tip, the crack speed and crack trajectory, etc.) are analysed. By means of dynamic photoelasticity, the interaction between the stress wave and the growth crack is interpreted to show the relations between dynamic fracture parameters and stress waves. |
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| Keywords: | dynamic caustics dynamic photoelasticity crack curving crack speed stress wave mixed mode stress intensity factors crack speed |
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