Loading conditions and complex geometry have led the cylinder heads to become the most challenging parts of diesel engines. The aim of this study is to compare the distribution of temperature and stress in the aluminum and magnesium cylinder heads under thermo-mechanical loads. The three-dimensional model of the cylinder heads was simulated in abaqus software and a two-layer viscoplasticity mod...

The design of composite materials requires microstructurally based computational approaches to optimize the shape and the spatial arrangement of the constituents with respect to a sought-after effective property. This topic remains widely opened especially in the case of heterogeneous media which exhibit multifi eld couplings in their constitutive relations. Up to now, the numerical homogenizat...

We propose a variational h-adaption strategy in which the evolution of the mesh is driven directly by the governing minimum principle. This minimum principle is the principle of minimum potential energy in the case of elastostatics; and a minimum principle for the incremental static problem of elasto-viscoplasticity. In particular, the mesh is refined locally when the resulting energy or increm...

Using crystal plasticity, finite element analyses were carried out to model cyclic deformation for a low solvus high refractory (LSHR) nickel superalloy at elevated temperature. The analyses were implemented using a representative volume element (RVE), consisting of realistic microstructure obtained from SEM images of the material. Monotonic, stress-relaxation and cyclic test data at 725 C were...

In tensile tests the PP/flax fiber composites clearly shows a nonlinear behavior in loading and hystheresis loops in unloading. In creep tests performed at different load levels the response was nonlinear viscoelastic, and after recovery, viscoplastic strains were detected. No degradation in stiffness could be seen and thus nonlinear viscoelasticity and viscoplasticity were assumed to be the ma...

Observations demonstrate that faults are fractal surfaces with deviations from planarity at all scales. We study dynamic rupture propagation on self-similar faults having root mean square (rms) height fluctuations of order 10 3 to 10 2 times the profile length. Our 2D plane strain models feature strongly rate-weakening fault friction and off-fault Drucker–Prager viscoplasticity. The latter boun...

The choice of a pure cohesive or a pure frictional viscoplastic model to represent the rheological behaviour of a flowslide is of paramount importance in order to obtain accurate results for real cases. The principal goal of the present work is to clarify the influence of the type of viscous model-pure cohesive versus pure frictional-with the numerical reproduction of two different real flowsli...

Abstract Background Fatigue failure criteria for fibre reinforced polymer composites used in the design of marine structures are based on micromechanical behaviour (e.g. stiffness properties) their constituents. In literature, there is a lack information regarding degradation fibres, matrix and fibre/matrix interface regions affected by environmental fatigue. Objective The aim present study to ...

Abstract Fatigue failure plays an important role in engineering applications, especially when structural components experience significant cyclic thermal loading and complex force simultaneously. During the last decades, several post‐processing techniques have been developed based on empirical investigations of experimental evidence to predict fatigue life materials. The work at hand postulates...

A non-linear microscale diffusion-mechanics model combining mass transport and linear momentum balance equations, with elasto-viscoplastic polymer constitutive law interfacial traction-separation is proposed to provide a new insight into the effects of viscoplasticity damage on in situ diffusive-mechanical behaviour polymer-based cathode for solid-state battery (SSB). Diffusion mechanics are co...