复合材料单向板裂纹尖端的应变能释放率

On Strain Energy Release Rate near Crack Tip in Unidirectional Plate of Composite Materials

本文通过将裂纹尖端应力和位移代入应变能释放率的一般公式,推出了线弹性正交异性复合材料单向板非弹性主方向在对称载荷作用下的裂纹尖端应变能释放率的计算公式,给出了相应的应变能释放率断裂判据。作为特例,得到了Ⅰ型裂纹尖端应变能释放率的计算公式和断裂判据。

In this paper, first the computing formulae of the stra(?)n energy release rate near erack tip in off-axis unidirectional plate of linear-elastic orthotropic composite materials under symmetric loading by substituting crack-tip stresses and displacements into general formula of the sirain energy release rate are derived, then the corresponding strain energy release rate fracture criterions arc given. As special examples, the computing formula and fracture criterion of strain energy release rate of mode I crack-tip can be obtained.