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2-D Shapes Are Behind the Drapes! by Tracy Kompelien

By Tracy Kompelien

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Title: 2-D Shapes Are in the back of the Drapes!
Author: Kompelien, Tracy
Publisher: Abdo Group
Publication Date: 2006/09/01
Number of Pages: 24
Binding kind: LIBRARY
Library of Congress: 2006012570

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33) From the condition of normality, the direction of the incremental plastic strain vector specified by this equation must intersect the yield locus at a right angle . _=-l. 34), and taking the limit as op' and oq differential equa tion is ob tairred : Cam-clay is based on the following assumptions_ The isotropic normal consolidation line has an equation: v=r+ q dq -=-M+dp' p" A-K -Aln(p'), and isotropic swelling and recompression lines have equations: V=V,,-Kln(p'). 1 Derivation of Cam-day (a) 75 Comments on Cam-day Sec.

It is only recently that the underlying mathematics has come to be understood. It is possible to identify three stages in how finite element techniques for stress analysis have been formulated and interpreted over the last three decades : (a) the method was regarded as an extension of matrix methods for the computerised analysis of structural frames. This method requires a 'stiffness matrix' describing the stiffness properties of one part of the structure. The only difference between a computer program for matrix analysis and one for finite element analysis is that the latter uses stiffness matrices which describe the stiffness of parts of a continuum.

Their paper ~pe~ulates about what happen~ to the cap on elastic unloading and during tnaxlal tests, but makes no fIrm proposals. 4) . , and discarded others. In doing so they managed to produce a model of soil behaviour which is 'simple' in the sense that the model is derived from a small number of basic assumptions, yet the model manages to reproduce for the first time an appropriate description of volumetric response under shear. What really sets the critical state models apart from other attempts to formulate elasto-plastic models for soils is the critical state line.

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