Download Rheology and Soil Mechanics / Rhéologie et Mécanique des by A. E. Green, R. S. Rivlin (auth.), J. Kravtchenko, P. M. PDF

By A. E. Green, R. S. Rivlin (auth.), J. Kravtchenko, P. M. Sirieys (eds.)

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Read or Download Rheology and Soil Mechanics / Rhéologie et Mécanique des Sols: Symposium Grenoble, April 1–8, 1964 / Symposium Grenoble, 1er–8 Avril 1964 PDF

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Extra resources for Rheology and Soil Mechanics / Rhéologie et Mécanique des Sols: Symposium Grenoble, April 1–8, 1964 / Symposium Grenoble, 1er–8 Avril 1964

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For the record, with compression positive the invariants of the stress tensor and stress deviation tensor are: J1 = - 3p = - (0"1 1 232 J 2 =3(0"1 - 0"2) =21'0 = + 20"2)' 4 3 2 1'max (5) 1 2 =3 q , (6) (7) In this special case, the octahedral shearing stress and the maximum shearing stress are proportional and so provide the same isotropie measure of stress. Successive yield surfaces appear in Fig. 6 as lines parallel to the p-axis, 0"1 = 0"2 = 0"3' because the hydrostatic pressure p has no effect on the plastic deformation of the metal.

Nothing so simple should be expeeted to, or does in fact, control the state of the material as portrayed by the shape and size of the eurrent yield surfaee for areal metal. Strong path dependence is found. Hardening is markedly anisotropie under most eonditions. The set of sueeessive yield surfaees for one direction of loading in stress space bears little resemblanee to that for another direetion. ------~ c d Fig. 3 a-d. Comparison of actual yield surfaees for aluminum alloys with isotropie stress-hardening.

Time effects which appear over long times during a nominally elastic recovery of volume, and rate effects in testing are discussed in terms of time-dependent stress-strain relations [12]. The corresponding asymptotic states also are considered from the time-independent point of view. Differences which arise in the degree of material stability to be expected are examined. The concept of stability of material gives the essential features of time-independent plasticity. Its application is broadened here to include some of the special aspects of soils [22] as distinguished from metals.

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