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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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球形压痕的凸起凹陷行为及其对硬度测量的影响
Keywords: 材料科学基础学科,有限元法,压痕的凸起凹陷,球形压痕,屈服应变,硬化指数
Abstract:
？采用球形压头的数值模拟表明,当应变硬化指数n大于0.23时,不论屈服应变σy/e为何值,在压入过程中所有材料的压痕周围均出现凹陷;当n小于0.23时,随着σy/e的增大,材料由凸起向凹陷转变;当σy/e大于0.02时,不论n为何值材料也都出现凹陷;当σy/e小于0.02时,材料出现凸起向凹陷的转变.当比值残余压痕深度/最大压入深度(hf/hmax)小于0.76时,材料出现凹陷,n值越大凹陷越严重;当(hf/hmax)}>0.76,若n<0.23材料出现由凸起向凹陷转变,若n>0.23材料均发生凹陷.还得到了反映凸起凹陷的表观参量c2与接触面积am之间的函数关系,分析了c2对压痕硬度误差的影响规律.
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