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

Bone remodeling is the process of ongoing replacement of old bone by new. The remodeling process is achieved by bone-resorbing osteoclasts and bone-forming osteoblasts. In terrestrial vertebrates, activities of these two types of cells are strictly balanced and adapt the shape of bone to mechanical stress. A simple bone remodeling model by coupling the bone formation and resorption based on Turing reaction-diffusion system weighed by local mechanical stress was proposed. This model was coupled with finite element method by using the element adding and removing process, and a new bionic topology optimization model was established. The major idea of this approach is to consider the continuum structure to be optimized as a piece of bone, and the process of finding the optimum topology of a structure was equivalent to the bone remodeling process. Uniform distribution of strain-energy density as a guideline updated the material distribution, until equilibrium was reached and then the optimal topology structure was obtained. The effectiveness of the present method is demonstrated by some numerical examples.