猪背部皮肤生物力学特性的实验研究

Experimental study on biomechanical property of the skin in pig's back

目的对猪背部皮肤进行生物力学实验研究,评价其生物力学特性,为临床和皮类制品提供必要的理论基础。方法选用猪背部皮肤为试验材料,分别进行不同加载速率的单调拉伸和拉拉循环实验研究,以及不同加载方向和不同应力水平下的蠕变和拉拉循环实验研究。结果猪皮在皮纹线方向上抵抗拉伸、蠕变和循环变形的能力强于垂直皮纹线方向;猪皮的蠕变曲线由减速、稳定和破坏3阶段组成,并依赖于加载水平的大小;猪皮在非对称应力循环下体现出明显的棘轮效应,棘轮变形体现出显著的平均应力、应力幅值和加载速率效应。结论实验对皮肤的黏弹性和各向异性的生物力学特性进行了系统的研究,为临床和皮类制品提供了必要的理论基础。

Objective To investigate and evaluate the biomechanical property of the skin in pig＇s back in order to provide the essential theoretical basis for clinical and skin products. Method Taking the skin in pig＇s back as experimental material, the monotonic tensile and cyclic tension-tension tests with different loading rates was researched respectively. Meanwhile, with different loading directions and stress levels the creep and cyclic tension-tension tests were also been studied experimentally. Result The capacity of resisting tensile, creep and cyclic deformation of pig＇s skin in the direction along the Langer＇s line is stronger than that perpendicular to the Langer＇s line. The creep curve of pig＇s skin is load-dependent and consisted of three phases about deceleration phase, stabilization phase and destruction stage. Pig＇s skin exhibits apparent ratcheting under asymmetry stress cycle. Ratcheting deformation displays significant mean stress, stress amplitude and loading speed dependence.Conclusion Based on the experiment, the biomechanics property of skin＇s viscoelasticity and anisotropic feature have been sysmatic stadied, it＇s provide necessary theoretical fundation for clinical and leather products.