Showing papers by "Demetres Briassoulis published in 1988"
TL;DR: In this article, a remedy for the pure machine locking problem is developed for the Lagrangian and serendipity elements based on the modified transverse shear modulus, which is also extended to control shear locking.
Abstract: The degenerated shell element is one of the most efficient elements for analysing shell structures. However, it is known to result in rather stiff models when used in thin element applications. The phenomena associated with this behaviour are known as locking phenomena.
This paper analyses the machine locking mechanism developed in thin to very thin Lagrangian and serendipity elements. The machine related locking phenomenon is distinguished from the shear and membrane locking phenomena. A remedy for the pure machine locking problem is developed for the two elements. The proposed remedy is based on the technique of the modified transverse shear modulus. It is also extended to control shear locking. The proposed technique is shown to completely eliminate machine locking. Also, it is shown to effectively alleviate stiffening effects due to the presence of spurious shear strain.
22 citations
TL;DR: In this paper, the nine-node Lagrangian degenerated shell element under reduced integration exhibits excellent performance, provided that no zero-energy modes develop, and a simple scheme of artificial stiffening of the element to eliminate zero energy modes is investigated.
14 citations
TL;DR: In this article, the effects of the integration scheme, the order of the element, the modeled Kirchhoff field and the element distortion are analyzed explicitly and quantitatively for the four-node, eight-node and nine-node degenerated shell elements.
14 citations
18 Apr 1988
2 citations