Droplet impingement of metallic surfaces at high impact velocities results, after some time, in erosion of the surface due to fatigue. By extending our previously published analytical model to enable the use of experimental fatigue data (S‐N curves), here, for the first time, a wide range of experimental liquid droplet erosion incubation period test states for both ferrous (stainless steel AISI 316) and nonferrous (aluminium 6061‐T6) engineering metals have been investigated. To achieve this, the developed model includes additional surface hardening and a residual compressive stress state at the surface due to a water drop peening effect. As such, the interrelation of the physical and mechanical properties that follows from the model has been used to identify how changes in selected metal properties might enhance droplet impingement erosion incubation life. Model predictions for both metals, using fatigue data from S‐N curves from different literature sources, showed for the droplet impact velocity range of 140 to 400 m/s an excellent agreement with results from a multiregression equation as determined from an ASTM interlaboratory test program.

中文翻译：

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基于疲劳的金属表面液滴冲击腐蚀潜伏期模型

一段时间后，以高冲击速度对金属表面的液滴撞击会导致由于疲劳而腐蚀表面。通过扩展我们先前发布的分析模型以允许使用实验疲劳数据（SN曲线），在这里首次首次对两种铁（不锈钢AISI 316）进行了广泛的液滴侵蚀潜伏期试验已对有色金属（6061-T6铝）工程金属进行了研究。为此，开发的模型包括额外的表面硬化和由于水滴喷丸作用而在表面产生的残余压应力状态。因此，从模型中得出的物理和机械性能之间的相互关系已被用于确定所选金属性能的变化如何增加液滴撞击侵蚀的孵化寿命。使用来自不同文献来源的S‐N曲线的疲劳数据对两种金属进行的模型预测表明，液滴冲击速度范围为140至400 m / s，与ASTM实验室间试验计划确定的多元回归方程的结果非常吻合。