โปรแกรมไฟไนต์เอลิเมนต์ที่ปรับขนาดชิ้นส่วนอัตโนมัติ โดยใช้ชิ้นส่วนสามเหลี่ยมชนิดความเครียดเชิงเส้น

Abstract

Given the same number of degrees of freedom ( DOF ) for a problem, an analysis employing the finite element method gives the best solution when errors are uniformly distributed over the whole domain. To obtain better solutions with minimum effort of data preparation and less computation time, an automatic adaptive remeshing technique is being developed. To date, a mesh improvement  procedure, angle – based smoothing technique has already been incorporated into a finite element analysis program. Numerical analysis with benchmark  plane stress problems utilizing such approach showed satisfactory results.  However, due to the use of the constant strain triangular element (CST), the computation time required is still ineffective.  In this research, a better element type, the linear strain triangular element (LST) is used. It has been found that, from the selected examples having the same constraints, the LST approach can reduce the total DOF by approximately 3-30 times. The calculation time, as a consequence, can be reduced by about 3-300 times. Thus, it has been shown that the proposed finite element program can quickly and effectively solve a plane problem with a minimum effort of data preparation and computation time.