000004839 001__ 4839
000004839 005__ 20141119144558.0
000004839 04107 $$aeng
000004839 046__ $$k2002-06-02
000004839 100__ $$aKishino, Yuji
000004839 24500 $$aTHE INCREMENTAL NONLINEARITY OBSERVED IN NUMERICAL TESTS OF GRANULAR MEDIA

000004839 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference
000004839 260__ $$bColumbia University in the City of New York
000004839 506__ $$arestricted
000004839 520__ $$2eng$$aRecently, incrementally nonlinear constitutive models have been proposed for granular media by several researchers. It seems that such generalization of constitutive relationship is the key to grasping true behaviors of granular media. However, it is very difficult to do rigorous evaluation of the validity of these models, because of the limitations inherent in available experimental measures. On the other hand, numerical simulations in terms of suitable discrete element methods have a capability to solve this problem. This paper demonstrates the incremental nonlinearity observed in numerical tests conducted by a discrete element method proposed by the author. Through a series of true tri-axial stress-probe tests, it is found that the direction of plastic strain increment changes with the component of stress increment that is orthogonal to the current stress and the yield surface normal. The result suggests that the plastic deformation is accompanied by multiple shear mechanisms. The stability in the incremental relationship between stress and strain is also discussed based on the calculated results of second-order work.

000004839 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004839 653__ $$agranular media, incremental nonlinearity, Granular Element Method, numerical test stress-probe test, true tri-axial test, multiple shear mechanisms, stability, second-order work

000004839 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002
000004839 720__ $$aKishino, Yuji
000004839 8560_ $$ffischerc@itam.cas.cz
000004839 8564_ $$s263958$$uhttp://invenio.itam.cas.cz/record/4839/files/418.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004839 962__ $$r4594
000004839 980__ $$aPAPER