Based on an approximate interpolation scheme, an analytical model for void closure in nonlinear plastic materials was established.
采用插值近似，建立了空洞闭合的解析模型，发现空洞变形的主要机理来自于空洞周围基体材料的塑性流动。
In each time element, approximate solution is constructed by the Lagrangian interpolation functions.
在时间单元上用拉格朗日插值函数构造近似解。
The collocation method is a numerical method which search for the approximate solution of the equation by way of meeting pure interpolation condition.
配置法是以满足纯插值约束条件的方式，寻求算子方程近似解的方法，且具有无需计算数值积分、计算量小、收敛阶高等优点。
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