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Fatigue Crack Growth Rate of 16mnr Steel with Effect of Stress Ratio

机译:应力比对16mnr钢疲劳裂纹扩展速率的影响

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Fatigue crack growth was simulated by using a newly developed unified model on the fatigue initiation and crack growth based on an incremental multiaxial fatigue criterion. The cyclic elastic-plastic stress-strain field was analyzed using the general-purpose finite element software (ABAQUS) with the implementation of a robust cyclic plasticity theory. The fatigue crack growth rates with respect to three different stress ratios were selected as the benchmark to check the unified model. The predicted results agreed with the experimental data very well. The insensitivity of the crack growth rate to the stress ratio is due to the fast mean stress relaxation.
机译:通过使用新开发的基于增量多轴疲劳准则的疲劳萌生和裂纹扩展统一模型,模拟疲劳裂纹扩展。利用通用的有限元软件(ABAQUS),结合稳健的循环塑性理论,分析了循环弹塑性应力应变场。选择相对于三种不同应力比的疲劳裂纹扩展速率作为检验统一模型的基准。预测结果与实验数据吻合得很好。裂纹扩展速率对应力比的不敏感是由于快速平均应力松弛。

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