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TJ tD

, Eq 35 \

Fleck ^

V V

\ * \ x \ % \ *

\ i \ 1

Normalized mean stress (Wy)

Normalized mean stress (Wy)

Fig. 8 Yield surfaces predicted by Fleck's (Ref 17) isotropic model for (a) V= 0 and (b) V= 1, compared with the prediction of Eq 41 and 35

Fleck (Ref 17) has also examined the influence of material anisotropy by relating the size and number of contacts at a

0 0

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