仿生支架力学性能测试与分析

Test and Analysis of the Mechanical Properties of Bionic Scaffolds

仿生支架可以采用CAD建模方法设计内部结构,并采用快速成形加工制备仿生支架实体。仿生支架必须保证其结构形状和力学性能,其中力学性能与内部单元的排列方式和尺寸有关,通常采用的排列方式包括0/90°排列方式、0/60°/120°排列方式及两两相交排列。通过力学试验证明:增大内部单元尺寸可以提高力学性能;在不同的排列方式中,0/90°排列方式的仿生支架具有较高的抗压性能,同时,承受压力的方向同样影响仿生支架的力学性能,在X方向和Y方向,仿生支架具有较高的压力承受能力;在支架受到外界压力作用时,支架的应力一应变不是均匀变化的,而是由4个不同的阶段构成。

Such porous scaffolds can be designed by CAD modeling method,and fabricated by rap- id prototyping technology.The mechanical properties of the scaffolds is related to the array modes and sizes of the inner units.The array modes include 0/90 array,0/60/120 array and interleaving array. Mechanical tests prove that the bigger size enhances the mechanical capability,and that 0/90 array can bear more pressure.Meanwhile,the press direction influences the mechanical properties,and the scaffolds have bigger pressure capability in X and Y direction.Under the circumstance of the outer forces,the stress-stain curve changes with time and it is combined with 4 stages.