Robust contact modeling using trimmed NURBS surfaces for dynamic simulations of articular contact
Robust contact modeling using trimmed NURBS surfaces for dynamic simulations of articular contact
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DOI：
10.1016/j.cma.2009.02.022
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发表时间：
2009-01-01
影响因子：
7.2
通讯作者：
Piazza, Stephen J.
中科院分区：
文献类型：
--
作者：
Landon, Ryan L.;Hast, Michael W.;Piazza, Stephen J.
随着年轻患者对新关节提出更高的功能要求，对骨科植入物在现实体内环境中的行为进行计算模拟作为一种测试应用于前瞻性设计的重要性正在迅速增长。除了肌肉和韧带的作用力外，在这些模拟过程中，必须以准确和高效的方式计算和应用假体接触引起的作用力。提出了一种利用刚体弹簧模型(RBSM)计算种植体接触力的方法，即当一个种植体上的接触节点穿透到构成第二个种植体的NURBS曲面片中时，通过该方法计算种植体接触力。描述了一种用于放置均匀分布的接触节点的方案，以及用于明确解释节点是否与特定表面接触的方法。然后使用不同的弹簧间距来评估正确表示曲面的能力。使用该方案间隔3 mm的接触节点似乎产生了与使用较小间隔获得的运动相似的模拟植入物运动，并且产生的模拟比使用三角测量放置类似数量的弹簧节点时可能的模拟更稳定。(C)2009爱思唯尔B.V.保留所有权利。
Computational simulation of the behavior of orthopaedic implants in a realistic in vivo environment is rapidly growing in importance as a test applied to prospective designs as younger patients place greater functional demands on their new joints. In addition to muscle and ligament forces, forces caused by implant contact must be computed and applied in an accurate and efficient manner during these simulations. A method is presented by which implant contact forces are computed from the contact nodes on one implant as the nodes penetrate into NURBS Surface patches that comprise a second implant using a rigid-body-spring-model (RBSM). A scheme for placing evenly-distributed contact nodes is described, as well as methods for unambiguously interpreting whether a node is in contact with a specific surface. The ability to represent the surface properly was then evaluated using various spring-spacings. Spacing contact nodes 3 mm apart using this scheme appears to produce simulated implant motions that are similar to those obtained using smaller spacings, and results in simulations that are more stable than those possible when a similar number of spring nodes are placed using triangulation. (C) 2009 Elsevier B.V. All rights reserved.