<p>This study introduces a three-dimensional Hermite element. The project entails the extension of one-dimensional continuous Hermite shape functions to their three-dimensional equivalents. This extension produces a polynomial of 64 independent terms. However, for a 3D element, in many cases it is not necessary to use a polynomial of 64 independent terms, and adequate accuracy in shape functions can be achieved with a smaller number of terms. It should be noted that for the 8-node configuration, only 32 degrees of freedom are necessary to achieve C1 continuity. Consequently, a new method was developed to extract all viable combinations of 32-term polynomials from the original set of 64-term polynomials in this paper. To get continuous finite element shape functions of C1 continuity, polynomial selection procedures take into account many important factors, such as completeness, consistency, symmetry, and the delta function property. The method shown is a reliable way to choose the right polynomial terms to make sure that all the continuity constraints for the three-dimensional Hermite shape functions are met. This development enables enhanced precision and dependability in finite element analysis for three-dimensional applications. Three fourth-order equations were examined to ascertain the accuracy and precision of the shape functions. The findings indicated that the shape functions are effective and applicable for future research endeavors.</p>

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Developing an Efficient Three-Dimensional Hermite-Family Element for Gradient Elasticity Analysis

  • Safoura Sadeghi,
  • YaghoubTadi Beni

摘要

This study introduces a three-dimensional Hermite element. The project entails the extension of one-dimensional continuous Hermite shape functions to their three-dimensional equivalents. This extension produces a polynomial of 64 independent terms. However, for a 3D element, in many cases it is not necessary to use a polynomial of 64 independent terms, and adequate accuracy in shape functions can be achieved with a smaller number of terms. It should be noted that for the 8-node configuration, only 32 degrees of freedom are necessary to achieve C1 continuity. Consequently, a new method was developed to extract all viable combinations of 32-term polynomials from the original set of 64-term polynomials in this paper. To get continuous finite element shape functions of C1 continuity, polynomial selection procedures take into account many important factors, such as completeness, consistency, symmetry, and the delta function property. The method shown is a reliable way to choose the right polynomial terms to make sure that all the continuity constraints for the three-dimensional Hermite shape functions are met. This development enables enhanced precision and dependability in finite element analysis for three-dimensional applications. Three fourth-order equations were examined to ascertain the accuracy and precision of the shape functions. The findings indicated that the shape functions are effective and applicable for future research endeavors.