Robert L. Harder

TL;DR: A proposed standard set of test problems is described and applied to representative quadrilateral plate and solid brick finite elements, some of which have become de facto standards for comparing the accuracy of finite elements.

TL;DR: Three modifications are proposed whose combined effect is to correct deficiencies of Cook's four-noded quadrilateral while preserving satisfaction of the C 0 patch test and improved accuracy for the modified element rivaling, and in some cases exceeding, that of the eight- noded isoparametric with reduced order integration.

TL;DR: In this paper, it was shown that a simple modification of the shape functions of an eight-noded element can make this advantage disappear and test results confirm this result and show that the performance of a modified eight-ns element is similar to that of recently reported nine-ns.

TL;DR: In this paper, the singularity of rotation about the normal to a shell's surface is shown to be defective and a new method is described in which a unique normal is constructed at each node and automatically constrained.

TL;DR: In this article, a general-purpose fluid-structure interaction capability which can be used in analyzing internal acoustic problems in automobiles and aircraft has been formulated, and a variety of output features that are needed by the analyst in identifying the causes of the acoustic problems have been studied and implemented.