Abstract Stress-intensity factor and compliance solutions developed for a single edge notch (SEN) specimen has been validated and verified for tension-compression loading. Fatigue crack growth tests were conducted on the SEN and a surface-crack specimen at stress ratios, R of −1.0 and −2.0 using IN718 forged nickel base superalloy material. (The surface-crack specimen is referred to as the KB-bar specimen in the literature.) Experimentally determined compliance values for the SEN specimen compared well with the analytically predicted values. In addition, crack lengths measured using the compliance equation compared well with crack lengths measured using potential drop and optical techniques. Finally, agreement was found between the SEN and KB specimens in the intermediate crack growth rate range.

中文翻译：

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拉压载荷下单边缺口试样应力强度因子及柔量关系验证

摘要 为单边缺口 (SEN) 试样开发的应力强度因子和柔度解决方案已经过拉伸压缩载荷的验证和验证。使用 IN718 锻造镍基高温合金材料，在应力比 R 为 -1.0 和 -2.0 的 SEN 和表面裂纹试样上进行疲劳裂纹扩展测试。（表面裂纹试样在文献中被称为 KB-bar 试样。）实验确定的 SEN 试样的柔量值与分析预测值进行了很好的比较。此外，使用柔量方程测量的裂纹长度与使用电位降和光学技术测量的裂纹长度相比较。最后，发现 SEN 和 KB 试样在中间裂纹扩展速率范围内是一致的。