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

Three deformation stages of straightening T-rail’s warpage, including elastic deformation, elastic-plastic deformation and elastic unloading springback, were analyzed according to the elastic-plastic mechanics theory, the load-stroke expressions of three deformation stages were gained through deriving relationships among load, bending moment and stroke, and then the straightening load-stroke model was established. By using the model, the straightening stroke could be calculated directly and accurately according to the initial deflection. In order to verify the model presented, taking T89/B guide rail for example, the straightening experiment was conducted. Comparing the calculation strokes by model with experimental results, the relative errors are less than 10%. It showed the presented model was practical. It will give theoretical support to the development of automatic machines for T-rail’s warpage straightening.