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Low-Velocity Impact Wear Behavior of Ball-to-Flat Contact Under Constant Kinetic Energy

机译:恒定动能下球形触点的低速冲击磨损行为

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摘要

The im pact tests were conducted on metallic materials with different bulk hardness and Young's moduli. Analysis of the dynamics response during the tribological process showed that the tested materials had similar energy absorption, where the peak contact force increased as the tests continued. Moreover, wear volume decreased with the increase in Young's modulus of metals, except for Cr with a relatively low hardness. Wear rate was gradually reduced to a steady stage with increasing cycles, which was attributed to the decrease in contact stress and work-hardening effect. The main wear mechanism of impact was characterized by delamination, and the specific surface degradation mechanisms were depending on the mechanical properties of materials. The absorbed energy was used to the propagation of micro-cracks in the subsurface instead of plastic deformation, when resistance of friction wear and plastic behavior was improved. Hence, both the hardness and Young's modulus played important roles in the impact wear of metallic materials.
机译:对不同体积硬度和杨氏模量的金属材料进行了冲击试验。摩擦学过程中的动力学响应分析表明,试验材料具有相似的能量吸收,其中峰值接触力随着试验的继续而增加。此外,磨损量随着金属杨氏模量的增加而减少,但硬度相对较低的铬除外。随着循环次数的增加,磨损率逐渐降低到稳定阶段,这是由于接触应力和加工硬化效应的降低。冲击的主要磨损机制以分层为特征,具体的表面退化机制取决于材料的力学性能。当摩擦磨损抗力和塑性行为得到改善时,吸收的能量被用于亚表层微裂纹的扩展,而不是塑性变形。因此,硬度和杨氏模量在金属材料的冲击磨损中起着重要作用。

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