Zhang M, Zheng Y P, Mak A F
Rehabilitation Engineering Centre, Hong Kong Polytechnic University, Kowloon.
Med Eng Phys. 1997 Sep;19(6):512-7. doi: 10.1016/s1350-4533(97)00017-9.
A nonlinear finite element model was developed to investigate the biomechanics of indentation, particularly the influence of friction and large deformation on the calculation of the effective Young's modulus from the cylindrical, flat-ended indentation test of soft tissues. A new kappa table was given for calculation of the effective Young's modulus to account for the effects of layered geometry with consideration of the larger deformation. The results indicate that the effect of friction on the calculation of Young's modulus becomes significant with a large aspect ratio and with a large Poisson's ratio. It is found that the factor kappa increases almost proportionally to the increase of the indentation depth, especially obvious with a larger Poisson's ratio v and a larger aspect ratio a/h.
建立了一个非线性有限元模型，以研究压痕的生物力学，特别是摩擦力和大变形对软组织圆柱形平头压痕试验中有效杨氏模量计算的影响。给出了一个新的κ表，用于计算有效杨氏模量，以考虑分层几何形状的影响，并考虑到更大的变形。结果表明，随着长宽比和泊松比的增大，摩擦力对杨氏模量计算的影响变得显著。发现κ因子几乎与压痕深度的增加成正比增加，在较大的泊松比v和较大的长宽比a/h时尤其明显。
