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

Impact damage is the main form of rice threshing and one of the significant causes of rice injury. Based on the contact mechanics, models of the compressed displacement and the largest pressure distribution were established, as the threshing component centrally collided with a rice kernel. Due to the difference of moisture content, rice kernels plastic mechanics and brittle mechanics were different. The critical speed formula about impact damage was obtained as the rice kernel collided with the threshing element. Furthermore, the critical speed was calculated for the impact damage as to the spike tooth and the rice of zhendao10, wuxiangjing14, huaidao9, zhennuo653 and xieyou084. Besides, experimental study was performed on the test platform which proved that the experimental mean value was by and large in according with the theoretical calculation.