【摘要】 本文由运动裂纹尖端附近的应力场解,给出了动态焦散线方程和确定裂纹尖端位置、应力强度因子的计算公式.研究带边裂纹拱形三点弯曲试件在枪击动载荷下的动态断裂问题,得到系列动态焦散线照片并给出动态应力强度因子与裂纹扩展速度特性曲线以及裂纹不同扩展速度时的断口形貌特征.更多还原

【Abstract】 In this paper, the stress field near a crack tip is used to obtain the equation of dynamic caustics and formulas dcterming the position of crack tip and stress intensity factor. The fracture of three-points bending arch specimen with initial crack under impact loading is researched. The dynamic causitics photographs are faken, and the curve of relation between dynamic stress intensity factor and crack propagation velocity is given. The fracture surface in different crack prapagation velocity is investigated.更多还原