The Mechanics of Surface Modification for Rolling Element Performance

滚动体性能的表面改性机理

• 批准号: 9203252
• 负责人: Carol Rubin
• 金额: $ 19.6万
• 依托单位: Vanderbilt University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-15 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9203252&HistoricalAwards=false
• 关键词: Mechanics; Surface; Modification; Rolling; Element

Finite element modeling of elasto-plastic rolling and sliding contact will be extended to the near-surface region so that it can include surface damage due to repeated loading of individual asperities and surface irregularities. These irregularities produce intense spikes in the pressure distribution and result in cyclic plasticity and fatigue damage very close to the contact surface. The effects are not addressed by conventional Hertzian theory for smooth contact surfaces and become determining factors in the failure of rolling elements made from advanced materials. The modeling of the effects of irregularities will be extended to also study their effects on bodies with shallow modified surface layers and coatings in order to determine which properties and dimensions of these layers give optimal rolling element performance.

弹塑性滚动和滑动接触的有限元建模将扩展到近表面区域，以便它可以包括由于单个粗糙体和表面不规则性的重复加载而导致的表面损伤。 这些不规则性会在压力分布中产生强烈的峰值，并导致非常接近接触表面的循环塑性和疲劳损伤。 传统的光滑接触表面赫兹理论并未解决这些影响，而是成为先进材料制成的滚动元件失效的决定因素。 不规则影响的建模将扩展到研究它们对具有浅改性表面层和涂层的物体的影响，以确定这些层的哪些属性和尺寸可以提供最佳的滚动元件性能。