Espino Daniel M, Shepherd Duncan Et, Hukins David Wl
School of Mechanical Engineering, University of Birmingham, Birmingham, B15 2TT, UK.
Comput Methods Biomech Biomed Engin. 2013 Apr;16(4):413-24. doi: 10.1080/10255842.2011.623676. Epub 2012 Feb 21.
A new 2D method to implement transient contact using Comsol Multiphysics (finite element analysis software that enables multiphysics simulations) is described, which is based on Hertzian contact. This method is compared to the existing (default) contact method that does not enable real transient simulations, but instead performs steady-state solutions where time is a constant. The two types of contact modelling have been applied to simple 2D biological heart valve models, undergoing strains in the region of 10% under 20 kPa pressure (applied over 0.3 s). Both the methods predicted comparable stress patterns, locations of peak stresses, deformations and directions of principal stress. The default contact method predicted slightly greater contact stresses, but spreads over a shorter surface length than the new contact method. The default contact method is useful for contact systems with little transient dependency, due to ease of use. However, where transient conditions are important the new contact method is preferred.
描述了一种使用Comsol Multiphysics（一款支持多物理场模拟的有限元分析软件）实现瞬态接触的二维新方法，该方法基于赫兹接触。将此方法与现有的（默认）接触方法进行比较，后者无法进行真正的瞬态模拟，而是在时间为常数的情况下执行稳态解。这两种接触建模方法已应用于简单的二维生物心脏瓣膜模型，该模型在20 kPa压力（在0.3 s内施加）下应变达10%左右。两种方法预测的应力模式、峰值应力位置、变形和主应力方向相当。默认接触方法预测的接触应力略大，但分布的表面长度比新接触方法短。由于使用方便，默认接触方法对于瞬态依赖性较小的接触系统很有用。然而，在瞬态条件很重要的情况下，新接触方法更受青睐。
