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首页> 外文期刊>The Journal of Strain Analysis for Engineering Design >Energy response of S355 and 41Cr4 steel during fatigue crack growth process
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Energy response of S355 and 41Cr4 steel during fatigue crack growth process

机译:S355和41Cr4钢在疲劳裂纹扩展过程中的能量响应。

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摘要

In this research, a novel approach of the fatigue crack growth rate description has been proposed. Based on theoretical and experimental approach, the mean stress effect expressed by R -ratio is present in classical da/dN –Δ K diagram. According to energy approach – based on the irrevocably dissipated energy accumulated in material (hysteresis loop) during fatigue process – the mean stress effect can be minimalized. Experimental validation of the proposed model was performed using results of fatigue crack propagation data for S355 and 41Cr4 steels in terms of strain energy density parameter Δ S or cyclic J -integral range –Δ J . In contrast to the force approach based on K _(max)(or Δ K ), the energy parameters Δ S or Δ J represent unambiguously the fatigue crack propagation rate, without influence of mean stress effect – R -ratio. However, in near threshold range of kinetic fatigue fracture diagram, the energy parameter displays a slight dispersion of the experimental data. According to the crack closure theory and its U -Elber parameter, the dispersion of experimental data is decreased. Therefore, the crack closure effects have a high significance in energy model – similar to the ‘force approach’ based on Δ K concept.
机译:在这项研究中,提出了一种新的疲劳裂纹扩展速率描述方法。基于理论和实验方法,经典da / dN –Δ K图中存在用R-比率表示的平均应力效应。根据能量方法-基于疲劳过程中材料(磁滞回线)中累积的不可消散的能量-可以将平均应力影响最小化。利用S355和41Cr4钢的疲劳裂纹扩展数据,根据应变能密度参数ΔS或循环J积分范围–Δ J,对所提出模型进行了实验验证。与基于K _(max)(或ΔK)的力方法相反,能量参数ΔS或ΔJ明确表示疲劳裂纹扩展速率,而没有平均应力影响– R-比。然而,在动疲劳断裂图的阈值范围附近,能量参数显示实验数据略有分散。根据裂纹闭合理论及其U-Elber参数,减小了实验数据的离散度。因此,裂纹闭合效应在能量模型中具有很高的意义-类似于基于ΔK概念的“力法”。

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