For the friction and wear of braking surface disc brake, mechanism contact deformation rough is analyzed. Considering elastoplastic mechanics surfaces, combined with Archard calculation theory, a model fractal established, life prediction brake proposed. Based on high-speed heavy-load conditions, influence different parameters studied. Moreover, pin-on-disc test used to verify validity model, a...

in saturated soils, heating induces thermal expansion of both grains and the pore fluid. lower thermal expansion coefficient of aggregates results in the increase of pore pressure and reduction of the effective stress besides subsequent volume changes due to the dissipation of pore pressure and heat transfer. dissipation of thermally induced pore pressure with time is a coupled thermo-hydro-mec...

We explain an interface for the implementation of rate-independent elastoplasticity which separates the pointwise evaluation of the elastoplastic material law and the global solution of the momentum balance equation. The elastoplastic problem is discretized in time by the implicit Euler method and every time step is solved with a Newton iteration. For the discretization in space the material pa...

A coupled elastoplastic-damage constitutive model taking into account chemo-induced elastoplastic-damage effects for the modeling of coupled chemothermo-hygro-mechanical behavior of concretes at high temperature is proposed in this article. A three-step operator split algorithm for the integration of the rate coupled constitutive equations is developed. Consistent tangent modulus matrices for c...

We study the leakage of air in syringes with Teflon coated rubber stopper and glass barrel. The leakrate depends on interfacial surface roughness, viscoelastic properties elastoplastic coating. measured rates are compared to predictions a simple theory for gas flow, which takes into account both diffusive ballistic multiscale contact mechanics determines probability distribution separations. sh...

This paper deals with unified elastoplastic and elastic-viscoplastic constitutive equations for metals submitted to large deformations. We present here a newly developed time integration algorithm which is an extension to the viscoplastic range of the classical radial return algorithm for plasticity. The resulting implicit algorithm is both efficient and very inexpensive. This algorithm is also...

In this paper a two-dimensional elastoplastic boundary element formulation is presented to analyse composite domains. The non-linear effects are assumed to develop only over the matrix material. In order to take into account the non-linear effects, the usual procedure based on the initial stress technique is adopted. The final non-linear system of equations is analysed by using explicit and imp...

This investigation proposes a more general dashpot model with elastoplastic deformation and rough surface based on the fractal theory in allusion to characteristic. Firstly, of contact body is depicted using Weierstrass-Mandelbrot (W-M) function. The entire process single asperity divided into elastic, elastoplastic, plastic phases, which are assumed be governed by Ma-Liu model. stiffness coeff...

We present and use a system of adaptive procedures for large-deformation finite element analysis of elastic and elastoplastic problems using the h-refinement approach. The procedures include a pointwise indicator for error in stresses, a pointwise indicator for error in plastic strain increments, a quadrilateral element mesh generator for generating completely new meshes on the deformed configu...