有限板共线多孔MSD应力强度因子有限元分析

Finite Element Analysis on SIF of a Number of Collinear Holes on MSD Finite Plate

文章应用二维断裂分析有限元软件FRANC2D/L对有限板共线多孔MSD应力强度因子进行有限元仿真分析,得到不同损伤模式下的应力强度因子(SIF)随裂纹尺寸变化的规律。将中心孔模式与已有文献结果进行比较表明,数值较为精确,证明了利用该方法得到的SIF计算结果的可靠性,即不同长度裂纹的SIF计算可有效地通过FRANC2D/L的裂纹扩展功能来实现。计算结果表明,MSD裂纹相比单裂纹的SIF有所增加,随着裂纹长度的增加,这种现象更加明显;在某些情况下,MSD裂纹的SIF可按单裂纹的SIF进行计算;影响MSD裂纹SIF的因素主要是邻近裂纹的长度、裂纹间或裂纹与边界的距离。最后文章给出了无主裂纹的MSD和有主裂纹的MSD两种情况的SIF随裂纹扩展历程变化的规律。

This paper uses a finite element software FRANC2D/L to analysis fracture problems on 2D crack. Use the software to analysis a number of collinear holes on MSD finite plate, and obtain the stress intensity factors （SIF）. Comparing the center-hole mode with the exist results in the literature, the calculation results agree well with the exist results. The paper proves that using this method to obtain SIF is reliable, that is to say, the SIF at each crack tip can be calculated by the crack growth simulation capability of FRANC2D/L. The results show that the SIF of MSD crack is bigger than the one of the single crack, with the propagation of the crack, the phenomenon is clearer. Under certain circumstances, the SIF of MSD crack can be directly calculated as a single crack. The main factors which will affect SIF general, such as MSD crack length, the space between cracks or between the crack and the boundary, are discussed. This paper also summarizes the changing law of SIF of MSD cracks without and with main crack.