We develop a basic element of the procedure of construction of the near-threshold part of the diagram of fatigue fracture for metallic materials under the conditions of transverse shear. It is proposed to use a square sample with edge cut and a force scheme of its cyclic loading. We determine the strain-stress state of a square plate with edge crack (regarded as a prototype of the proposed specimen) under the conditions of transverse shear by two independent methods (finite-element method and the method of singular integral equations). The stress intensity factor K II is determined for a broad interval of relative crack lengths with regard for the smooth contact of the crack faces and the presence of friction between the faces.

中文翻译：

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用于确定循环横向剪切下的疲劳阈值的试样

我们开发了在横向剪切条件下金属材料疲劳断裂图的近阈值部分构建程序的基本元素。建议使用带有边缘切割的方形样品及其循环加载的力方案。我们通过两种独立的方法（有限元法和奇异积分方程法）确定了在横向剪切条件下具有边缘裂纹的方板（作为所提出的试样的原型）的应变-应力状态。应力强度因子 K II 是针对裂纹面的平滑接触和面之间存在摩擦而确定的相对裂纹长度的较宽区间。