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(a) The distribution of circumferential stress computed using the heterogeneous model. The circumferential stress in each layer computed using the heterogeneous model was plotted against the normalized thickness as mean (•) ± S.D. (+) (n = 5). (b) The distribution of circumferential stress computed using the homogeneous model (solid line). It is plotted with the circumferential stress distribution in the heterogeneous model.
