摘要
基于半球形力学模型,对圆柱形平头压头下方典型材料尼龙12(PA12)弹塑性区域的力学行为进行了研究。压入过程中随着压入深度增大,半球形区域弹性和塑性边界半径与压头半径之比随之增大,但压深到一定值后增大趋势不再显著,压入深度对压入弹塑性区域的影响仅局限于距离压头中心较小的区域内。研究推导出了在压入过程中受压入影响的材料弹性和弹塑性变形区域半径的计算公式,并指出当在材料从塑性屈服开始到出现明显凸起时,该力学模型方可较好反映压入过程中材料弹性和弹塑性变形区域的应力应变特征。
In this paper,the mechanical behavior of PA12 under cylindrical flat-tip indenter based on hemi-spherical mechanical model was studied.The ratio of elastoplastic boundary radii and cylindrical radius increases with the indentation depth,and the trend of increasing becomes unobvious when indentation depth beyond a certain threshold.The effect of indentation depth on impress region is confined to a hemisphere with smaller radius.A formula is derived for calculating elastoplastic boundary radii under cylindrical flat-tip indenter.The model is just suitable for a narrow deformation range from plastic yield deformation to an obvious bulge and the mechanical model can well express the elastic deformation and plastic yield deformation in this range.
作者
冯超
刘二强
宋少楠
FENG Chao;LIU Erqiang;SONG Shaonan(College of Mechanical and Electrical Engineering and Mould Engineering,Taizhou Vocational College of Science and Technology,Taizhou 318020,China;College of Applied Sciences,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《弹性体》
CAS
北大核心
2022年第2期55-60,共6页
China Elastomerics
基金
国家自然科学基金资助项目(11702182)。
关键词
平头压头
弹塑性
半球形力学模型
弹塑性边界
flat-tip indenter
elastic-plasticity
hemi-spherical mechanical model
elastoplastic boundary
