A method for determining the critical value of the Cockcroft–Latham damage criterion is presented using the example of R260 railway steel. The determinations were performed using a rotary compression test specially developed for that purpose. The main object of the proposed test was to provide the best possible representation of the state of stress generated by cross-wedge rolling. The rotary compression test was performed in two stages: in the first stage, experimental tests were conducted to establish the moment of cracking of the specimen, and in the second stage, numerical modeling was used to determine the critical value of the Cockcroft–Latham criterion for the experimentally established cracking moment. The critical value of the Cockcroft–Latham criterion was determined under hot forming conditions.

中文翻译：

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用于确定 R260 钢的 Cockcroft-Latham 准则临界值的旋转压缩试验

以 R260 铁路钢为例，介绍了一种确定 Cockcroft-Latham 损伤准则临界值的方法。使用专门为此目的开发的旋转压缩测试进行测定。建议测试的主要目的是提供楔横轧产生的应力状态的最佳可能表示。旋转压缩试验分两个阶段进行：第一阶段进行实验测试以确定试样的开裂力矩，第二阶段使用数值模型确定 Cockcroft-Latham 准则的临界值对于实验确定的开裂力矩。Cockcroft-Latham 准则的临界值是在热成型条件下确定的。