Computational Contact and Impact Mechanics: Fundamentals of by Tod A. Laursen

By Tod A. Laursen

This publication comprehensively treats the formula and finite aspect approximation of touch and effect difficulties in nonlinear mechanics. meant for college students, researchers and practitioners drawn to numerical strong and structural research in addition to engineers and scientists facing applied sciences during which tribological reaction has to be characterised, the booklet comprises an introductory yet exact assessment of nonlinear finite point formulations ahead of facing touch and effect in particular. themes encompassed contain continuum mechanics, mathematical constitution, variational framework and finite point implementations linked to contact/impact interplay. also, very important and presently rising study issues in computational touch mechanics are brought, encompassing such themes as tribological complexity, conservative therapy of inelastic impression interplay and novel spatial discretization thoughts.

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Additional info for Computational Contact and Impact Mechanics: Fundamentals of Modeling Interfacial Phenomena in Nonlinear Finite Element Analysis

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Note that the are material quantities, in that they are associated with points X E O. It is useful at times to consider spatial forms of the weighting functions, obtained by composition of;P with the 40 2. Finite Element Formulations in Nonlinear Solid Mechanics (unknown) mapping '1'-1. 158) for any a: = CPt(X). This causes the condition w = 0 on cpt(r u) to be satisfied, and provided the configuration mapping is smooth (which we assume to be the case), all required partial derivatives of w can be computed.

It is used often enough to warrant a special symbol, denoted here as I: I=Vv. 64) and W 1 T = Vav = "2[1 -I ]. 65) It is clear that d is the symmetric part of the velocity gradient, while w is the antisymmetric, or skew, portion. The quantities d and w are spatial measures of deformation. The tensor d is effectively a measure of strain rate suitable for large deformations, while w provides a local measure of the rate of rotation of the material. 7). It is of interest at this point to discuss whether appropriate material counterparts of these objects exist.

4. 50 2. 8. Simple illustration of the incremental load approach to quasistatic problems. 199) and consider the following generic problem: given algorithmic approximations for the solution vector (d n ), velocity (v n ), and acceleration (an) at time t n , find approximations d n+1 , v n+! and an+! for these quantities at time t n+!. Note that in possible contrast to the quasistatic problem, the variable t here does have the interpretation of actual time. Several time-stepping algorithms have been proposed for this incremental problem we have posed.

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