| 动态焦散线实验方法及其在断裂力学中的初步应用 |
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| 引用本文： | 苏先基,雷志辉.动态焦散线实验方法及其在断裂力学中的初步应用[J].力学学报,1987(4). |
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| 作者姓名： | 苏先基 雷志辉 |
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| 作者单位： | 北京大学力学系
(苏先基)，北京大学力学系(雷志辉) |
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| 摘 要： | 本文给出了静、动态的焦散线方程,和确定裂纹尖端位置、动应力强度因子K_1~d的计算公式,并证明了在裂纹扩张速度较低时,可用静态公式计算,还研究了带预裂纹的三点弯曲梁和圆环在冲击载荷下的断裂问题,得到了系列动态焦散线照片、裂尖位置和动应力强度因子随时间的变化曲线。
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| 关 键 词： | 动态焦散线 断裂力学 |
EXPERIMENTAL METHOD OF DYNAMIC CAUSTICS AND ITS APPLICATION IN FRACTURE MECHANICS |
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| Su Xianji Lei Zhihui.EXPERIMENTAL METHOD OF DYNAMIC CAUSTICS AND ITS APPLICATION IN FRACTURE MECHANICS[J].chinese journal of theoretical and applied mechanics,1987(4). |
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| Authors: | Su Xianji Lei Zhihui |
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| Abstract: | The equation of static and dynamic caustics, and the formulae determing the position of crack tip and stress intensity factor are given. It is proved that for the case of low speed of crack propagation the static formula is availible in calculation. The fractures in beam and rings with initial crack under impact loading was researched. A series of dynamic cansi-tics phodos and the curves, which show the variations of corresponding crack lengths and dynamic stress intensity factors with time, are presented. |
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| Keywords: | Dynamic caustics Fracture mechanics |
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