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脆性裂纹动态传播中的速度振荡现象和理论分析

张振亚 段忠 周风华

张振亚, 段忠, 周风华. 脆性裂纹动态传播中的速度振荡现象和理论分析[J]. 力学学报, 2013, 45(5): 729-738. doi: 10.6052/0459-1879-13-056
引用本文: 张振亚, 段忠, 周风华. 脆性裂纹动态传播中的速度振荡现象和理论分析[J]. 力学学报, 2013, 45(5): 729-738. doi: 10.6052/0459-1879-13-056
Zhang Zhenya, Duan Zhong, Zhou Fenghua. EXPERIMENTAL AND THEORETICAL INVESTIGATIONS ON THE VELOCITY OSCILLATIONS OF DYNAMIC CRACK PROPAGATING IN BRITTLE MATERIAL TENSION[J]. Chinese Journal of Theoretical and Applied Mechanics, 2013, 45(5): 729-738. doi: 10.6052/0459-1879-13-056
Citation: Zhang Zhenya, Duan Zhong, Zhou Fenghua. EXPERIMENTAL AND THEORETICAL INVESTIGATIONS ON THE VELOCITY OSCILLATIONS OF DYNAMIC CRACK PROPAGATING IN BRITTLE MATERIAL TENSION[J]. Chinese Journal of Theoretical and Applied Mechanics, 2013, 45(5): 729-738. doi: 10.6052/0459-1879-13-056

脆性裂纹动态传播中的速度振荡现象和理论分析

doi: 10.6052/0459-1879-13-056
基金项目: 教育部博士点基金(20123305110005); 非线性力学国家重点实验室开放基金资助项目和宁波大学王宽诚幸福基金资助项目.
详细信息
    通讯作者:

    周风华,教授,主要研究方向:冲击动力学和断裂力学.E-mail:fzhou@nbu.edu.cn

  • 中图分类号: O346.1

EXPERIMENTAL AND THEORETICAL INVESTIGATIONS ON THE VELOCITY OSCILLATIONS OF DYNAMIC CRACK PROPAGATING IN BRITTLE MATERIAL TENSION

Funds: The project was supported by the Ministry of Education (MOE) Foundation for PhD Supervisors (20123305110005), the Opening Fund of State Key Laboratory of Nonlinear Mechanics, and the Ningbo University K. C. Wong Magna Fund.
  • 摘要: 设计了一种精确测量裂纹在预拉伸带板中的传播速度的实验装置, 系统研究了裂纹在受不同预加载荷作用的不同尺寸的有机玻璃 板中的传播行为.实验结果表明:在一个细长、上下表面固定的带板中, 裂纹速度分为加速和稳定2个阶段.在稳定速度阶段, 裂纹平均速度v0 是预加载荷在板中储存的弹性能Wh的增函数.由于此时裂纹处于自相似传播阶段, 可以认为材料的动态断裂能Gc是裂纹传播速度v0的增函数, 即材料存在"速度增韧性".当裂纹传播速度达到一定阈值, 裂纹的传播速度出现明显的振荡现象, 裂纹的振荡周期与断裂面出现的周期性沟槽的尺度一致.在更高的预加能量下, 裂纹传播路径出现弯曲、微分岔以及宏观分岔现象.建立了一个描述裂纹在带板中的直线传播行为的动力学模型, 并用这个模型模拟裂纹在传播过程中的速度振荡现象.

     

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出版历程
  • 收稿日期:  2013-03-05
  • 修回日期:  2013-07-01
  • 刊出日期:  2013-09-18

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