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Unformatted text preview: 1 Stress Calculation ■ First the global equilibrium equation KD = R is solved for D . Then, ◆ nodal dof d is available from D , ◆ element stresses are computed from σ = EBd + σ . ◆ This is done for every element individually . ◆ Software usually report stresses in local (i.e., element ) coordinates but should check software documentation. ■ There is an issue here: In general, B =f(x,y) ! ◆ Where in the element to compute the stresses? ✦ Stresses are usually more accurate within an element than on its boundary but we may be more interested in boundary stresses because they are usually larger there. ✦ So, it is better to calculate stresses at certain points (Gauss points) within the element and then to extrapolate from these. 2 Example on Stress Calculation 2a 2b Prob. 3.10: Given: u 1 =u 3 =-c, u 2 =u 4 =c ; c is a constant. v i =0 Find strains and stresses in the element....
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This note was uploaded on 06/06/2011 for the course EAS 4240 taught by Professor Peterifju during the Spring '08 term at University of Florida.
- Spring '08