Ling Daosheng

An h-type adaptive finite element

For h-type adaptive finite element method, the local mesh refinement introduces irregular nodes and destroys the standard continuity between elements. The reference nodes of the irregular are used to interpolate element coordinates and displacements. The improved shape functions, of which the conventional shape functions are a particular case, are presented to guarantee the continuity. No changes but the shape functions are needed when the method is applied in finite element programs. The computational results show the features of the method: higher accuracy, simplicity, fewer degrees of freedom and less computation effort.

Analysis of transient thermal stress in cylindrically orthotropic tubes

The incorrect deduction of equations in the research works devoted to the studies of transient stress in cylindrically orthotropic tubes and done by Kardomateas (Journal of Applied Mechanics,1989, 1990) leads to the wrong results. The errata (1991) correct the deduction error, but do not give the right numerical results. All errors are corrected, and the Mathematica is adopted to solve the large argument problem for Bassel function. A theoretical solution of the transient thermal stresses in tubes with uniform form is presented, and a numerical example is studied.