修正G-W模型研究结合面微观接触特性

发布时间：2018-05-07 06:43

本文选题：结合面 + 接触机理　；参考：《振动与冲击》2017年21期

【摘要】：G-W模型在模拟结合面微观接触时发现,当微凸体接触点数0n1时,两表面会产生接触这一不合理现象,提出修正G-W模型研究低载荷下机械结合面的微观接触特性。通过测量表面微观形貌特征和功率谱函数,获得结合面的微观形貌参数,研究表面粗糙度与接触力、微凸体接触数以及真实接触面积间的关系,分析结果表明:不同表面粗糙度下中心线间距与微凸体接触个数和接触力呈对数关系,间距越大,微凸体接触数目越少,接触力越小;在相同间距下,表面粗糙度越大,微凸体接触数目越少,接触力越大;不同表面粗糙度下微凸体接触个数与接触面积和接触力之间呈线性关系,微凸体的接触数目越多,表面接触面积和接触力越大;相同接触数目下,表面粗糙度越大,真实接触面积和接触力也越大;当接触变形量较小时,修正的G-W模型与Hertz接触模型吻合较好,接触变形与接触力之间呈对数递增,而与真实接触面积间近似呈线性递增关系。
[Abstract]:It is found in the G-W model that when the contact number of the microconvex body is 0n1, the contact between the two surfaces will be unreasonable. A modified G-W model is proposed to study the microcosmic contact characteristics of the mechanical interface under low load. The relationship between surface roughness and contact force, contact number of convex body and real contact area is studied by measuring the surface morphology characteristics and power spectrum function, and obtaining the micro-topography parameters of the bonding surface, and studying the relationship between the surface roughness and the contact force, the contact number of the convex body and the real contact area. The results show that the centerline spacing has a logarithmic relationship with the contact number and contact force of the microconvex body under different surface roughness. The larger the distance is, the less the contact number of the microconvex body is and the smaller the contact force is, and the greater the surface roughness is at the same distance, The smaller the contact number, the greater the contact force, the more the contact area and contact force are, the more the contact area and contact force are. When the contact deformation is small, the modified G-W model is in good agreement with the Hertz contact model, and the contact deformation and contact force increase logarithmically. The relationship between the contact area and the real contact area is linear and incremental.
【作者单位】：西安建筑科技大学机电工程学院;
【基金】：国家自然科学基金(51305327;51475352) 高等学校博士学科点专项科研基金(20136120120020) 陕西省自然科学基金(2014JQ7270)
【分类号】：TG659

【相似文献】