STRESS-INTENSITY FACTORS FOR A WIDE-RANGE OF SEMI-ELLIPTICAL SURFACE CRACKS IN FINITE-THICKNESS PLATES
STRESS-INTENSITY FACTORS FOR A WIDE-RANGE OF SEMI-ELLIPTICAL SURFACE CRACKS IN FINITE-THICKNESS PLATES
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DOI：
10.1016/0013-7944(79)90139-5
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发表时间：
1979-01-01
影响因子：
5.4
通讯作者：
NEWMAN, JC
中科院分区：
文献类型：
--
作者：
RAJU, IS;NEWMAN, JC
表面裂纹是飞机和压力容器部件中较为常见的缺陷之一。为了可靠地预测表面裂纹构件的裂纹扩展速率和断裂强度，需要对其进行精确的应力分析。在文献中已经出现了几种半椭圆表面裂纹受拉的应力强度因子的计算方法。本文给出了受拉板表面浅裂纹和深半椭圆形表面裂纹的应力强度因子。为了验证所采用的三维有限元模型的准确性，通过改变模型中的自由度数从1500到6900来研究收敛。这里使用的6900个自由度是以前报道的解决方案中使用的自由度的两倍多。此外，还研究了裂纹与自由表面交界处边界层区域的应力强度变化。
Surface cracks are among the more common flaws in aircraft and pressure vessel components. Accurate stress analyses of surface-cracked components are needed for reliable prediction of their crack growth rates and fracture strengths. Several calculations of stress-intensity factors for semi-elliptical surface cracks subjected to tension have appeared in the literature. However, some of these solutions are in disagreement by 50–100%.In this paper stress-intensity factors for shallow and deep semi-elliptical surface cracks in plates subjected to tension are presented. To verify the accuracy of the three-dimensional finite-element models employed, convergence was studied by varying the number of degrees of freedom in the models from 1500 to 6900. The 6900 degrees of freedom used here were more than twice the number used in previously reported solutions. Also, the stress-intensity variations in the boundary-layer region at the intersection of the crack with the free surface were investigated.