ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

11%～46%,。3-D finite element models and meshes of the cylinder in a certain vehicle diesel engine were established. With the combination of finite element analysis and submodel technology, ABAQUS software was used to carry out finite element strength analysis on engine block. Then the stress concentration position was determined and structural improvement of cylinder block was proposed. Based on this, MSC.Fatigue software was adopted to calculate fatigue strength of the water jacket basement submodel before and after modification, and stress test was done to validate the effect. The experiment results indicated that the stress of water jacket basement reduces from 11% to 46% after adding stiffening rib to the cylinder.