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Influence of Materials Hardenability Parameters on the Machine Parts Characteristics after Unloading

机译：材料淬透性参数对卸载后机器零件特性的影响

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摘要

This paper studies the problem of the relative area changing on a decrease of the load applied to the joint of roughness surfaces. The penetration of a rigid rough sphere (indenter) into the clastic hard half-space is initially considered, then the elastic crater restoring by unloading is considered. To defining elastic-plastic material, Hollomon's power law is used. To describe a contact of a rigid rough surface with an elastic plastic half-space, the discrete model of a rough surface is used. Micro asperities are represented as a set of identical spherical segments, the height distribution of which corresponds to the bearing profile curve of the real surface. The dependence the dimensionless force elastic-geometric parameter F_q on a relative amount of indentation s at loading and the dependence of analogous parameter F_(qe) on amount of ε-Δε at unloading are obtained. The relations of relative contact areas η and η_e on dimensionless loading F_q and F_(qe) at loading and unloading for different values of a hardening exponent n and parameter ε_y = σ_y/E* are given. The obtained results are of practical importance for the performance prediction of fixed machine elements' joints at the design stage, in particular for tightness supply of flange couplings and high pressure vessels seals.
机译：本文研究了相对区域改变的问题改变了施加到粗糙表面接头的负荷的减少。最初考虑将刚性粗糙球（压紧）渗透到碎片硬半空间中的渗透，然后考虑通过卸载恢复的弹性喷射口。为了定义弹性塑料材料，使用霍洛姆的电力法。为了描述具有弹性塑料半空间的刚性粗糙表面的刚性表面的接触，使用粗糙表面的离散模型。微粗糙度表示为一组相同的球形段，其高度分布对应于真实表面的轴承轮廓曲线。获得依赖性力弹性 - 几何参数F_Q在加载时的负载和依次ε-Δε的量的相对压痕S的依赖性。给出了相对接触区域η和η_e对加载和卸载的无量纲加载f_q和f_（qe）的关系，给出了硬化指数n和参数ε_y=σ_y/ e *的不同值。所得结果对于设计阶段的固定机器元件的关节性能预测，特别是用于法兰联接器和高压容器密封件的密封性的实际重要性。

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