AN EMPIRICAL STRESS-INTENSITY FACTOR EQUATION FOR THE SURFACE CRACK
AN EMPIRICAL STRESS-INTENSITY FACTOR EQUATION FOR THE SURFACE CRACK
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DOI：
10.1016/0013-7944(81)90116-8
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发表时间：
1981-01-01
影响因子：
5.4
通讯作者：
RAJU, IS
中科院分区：
文献类型：
--
作者：
NEWMAN, JC;RAJU, IS
本文给出了受拉和受弯载荷时表面裂纹应力强度因子的经验公式，它是参数角、裂纹深度、裂纹长度、板厚和板宽的函数。用于发展方程的应力强度因子是从以前的三维，有限元分析的半椭圆形表面裂纹在有限的弹性板受到拉伸或弯曲载荷。方程中包含了各种各样的配置参数。裂纹长度与板厚之比和裂纹深度与裂纹长度之比的范围为0 ~ 1.0。该方程还考虑了板宽对沿着裂纹前沿应力强度变化的影响，并用于预测拉伸或弯曲疲劳载荷下的表面裂纹扩展模式。该方程还用于关联脆性环氧材料的表面裂纹断裂数据，对于宽范围的裂纹形状和裂纹尺寸，误差在± 10%以内。
This paper presents an empirical stress-intensity factor equation for a surface cracks as a function of parametric angle, crack depth, crack length, plate thickness and plate width for tension and bending loads. The stress-intensity factors used to develop the equation were obtained from a previous three-dimensional, finite-element analysis of semielliptical surface cracks in finite elastic plates subjected to tension or bending loads. A wide range of configuration parameters was included in the equation. The ratios of crack length to plate thickness and the ratios of crack depth to crack length ranged from 0 to 1.0. The effects of plate width on stress-intensity variations along the crack front were also included.The equation was used to predict patterns of surface-crack growth under tension or bending fatigue loads. The equation was also used to correlate surface-crack fracture data for a brittle epoxy material within ± 10 percent for a wide range of crack shapes and crack sizes.