A plane hybrid element with rotational D.O.F. and adjustable stiffness. (English) Zbl 0615.73084

A simple formulation of a nine d.o.f. plane triangle is achieved by the assumed stress hybrid approach. The element has two translations and the rotation about a normal to the plane as d.o.f. at each node. Performance of the element is shown to be good. A device for softening overly-stiff elements is found to be effective and is suggested as a widely applicable method of improving the behaviour of hybrid elements. A particularly simple form of the element, herein called the CST Hybrid, appears to be the best performer.


74S05 Finite element methods applied to problems in solid mechanics
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