基于解析试函数的超协调四面体杂交元

A SUPER CONFORMING TETRAHEDRAL HYBRID ELEMENT BASED ON ANALYTICAL TRIAL FUNCTIONS

  • 摘要: 本文提出一类基于解析试函数的超协调四面体杂交元。不同于普通协调元采用的线位移协调插值格式,超协调元的位移场引入包含转角自由度等线位移导数的高阶协调假设,其内部应力场引入基于三维弹性力学基本解析解的完备到1次的应力场解析试函数。数值算例表明,与其他类型单元相比,此单元具有计算精度高和抗网格畸变的优势,有助于提升有限元数值模拟的精度。

     

    Abstract: In this paper, a novel class of super comforming tetrahedral hybrid element based on analytic test functions is proposed. Different from the linear displacement coordinated interpolation format adopted by traditional isoparametric element, the displacement field of super comforming elements introduces high-order conforming assumptions including linear displacement derivatives such as rotational degree of freedom (RDOF), and the internal stress field introduces a complete first-order stress field analytical trial function based on the fundamental analytical solution of three-dimensional elasticity theory. Numerical examples indicate that this element has high computational accuracy and strong ability to resist mesh distortion compared with other types of elements, which helps improve the accuracy of finite element numerical simulation.

     

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