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Figure 10


Fig. 10. The method of calculating the traction stress. (A) Each triangle element has three nodes, A1, A2 and A3, whose original positions are (x1, y1), (x2, y2), (x3, y3) and displacement vectors are (u1, v1), (u2, v2), (u3, v3), respectively. The strains at each point in one element are assumed to be distributed linearly. P is an arbitrary point whose original position is (x, y) and the displacement vector is (u, v). (B) The longitudinal and shearing strains, {epsilon}x, {epsilon}y and {gamma}xy, at the minute square in the element. (C) The normal and shearing stresses, {sigma}x, {sigma}y and {tau}xy, at the minute square in the element.





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