medium-heavy loading

The analysis focused on the effects of different specimen geometries(middle crack tension and central hole tension),different material work hardening models(linear-kinematic hardening and nonlinear-kinematic hardening), different loading conditions(constant amplitude cyclic loading,constant-K loading),and different stress ratios on crack opening/closing levels.

结果表明,在等K加载条件下,用瞬时最大应力正则化的裂纹张开、闭合应力水平和张开应力强度因子与应力比有关,但与裂纹长度无关。

The constant-K loading makes more sense than the constant amplitude cyclic loading in distingui-shing the effects of load level and crack length on the PICC and offers a new idea to characterize crack growth behavior.

采用了等K加载方式,即在裂纹扩展中裂尖应力强度因子的最大值Kmax保持不变(给定R比,最大应力σmax随裂纹长度变化)。

In order to study the creep properties of saturated sand,several tests with different loading patterns were conducted in this paper,including conventional loading(loading ratio of 1),loading with the loading ratio of 3,and equal gradient loading.

为研究单向压缩状态下饱和砂性土的蠕变特性,本文进行了饱和砂性土在常规加载(即加载比为1)与加载比为3及等梯度加载等不同加载方式下的蠕变试验并对试验结果进行对比分析。