Stress oscillations in plane stress modelling of flexure - A field- consistency interpretation

Prathap, Gangan and Subramanian, G and Ramesh Babu, C (1985) Stress oscillations in plane stress modelling of flexure - A field- consistency interpretation. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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Exactly integrated isoparametric plane stress elements13; behave poorly in flexure. The 4-noded element 'locks', with13; errors that progress indefiniGely as element aspect ratio13; inceases. Reduced integration of the shear strain energy13; eliminates this locking entirely. The 8-noded element does not lock, but improves in performance with reduced integration of shear strain energy. Both elements, with their original shape functions show severe shear stress oscillations in flexure. In this paper, we attribute these oscillations to the lack of 'consistency' of shear-strain fields derived directly from independent field-variable interpolations. We derive error models for specific tractable examples which can confirm the accuracy of this conceptual scheme through digital computation using the finite element models. A field-consistent re-distribution strategy for the shear strain-field is offered as an elegant procedure to free the elements of spurious13; oscillations and give a 'lock' free performance.

Item Type: Monograph (Technical Report)
Uncontrolled Keywords: Plane stress modelling;Gaussian integration
Subjects: ENGINEERING > Structural Mechanics
Depositing User: M/S ICAST NAL
Date Deposited: 05 Oct 2006
Last Modified: 24 May 2010 04:21

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