Cyclic loading of polycrystalline materials results in the localization of strain relative to microstructural features. In this work, strains characterized from digital image correlation were used to calculate a value for the incremental slip on the active slip systems and identify cases of slip transmission. Interconnected slip bands, between neighboring grains, were shown to accumulate more incremental slip (and associated strain) compared with slip bands confined to a single grain, where slip transmission did not occur. These results rationalize the role of grain clusters leading to intense strain accumulation and thus serving as potential sites for fatigue crack initiation.

中文翻译：

---

镍基高温合金循环加载过程中基于微结构的应变累积：相邻晶粒在互连滑带上的作用

多晶材料的循环加载导致应变相对于微结构特征的局部化。在这项工作中，使用以数字图像相关性为特征的应变来计算活动滑移系统上增量滑移的值，并确定滑移传播的情况。与相邻的晶粒之间的相互连接的滑带显示出的累积滑移（和相关应变）相比，限于单个晶粒的滑移带没有发生滑移传输，累积的滑移带（和相关应变）更多。这些结果使晶粒簇的作用合理化，导致强烈的应变积累，从而成为疲劳裂纹萌生的潜在场所。