Showing papers in "Mechanics of Materials in 2006"

TL;DR: In this paper, a thermodynamically consistent damage model is proposed for the simulation of progressive delamination in composite materials under variable-mode ratio, and a constitutive equation is developed to model the initiation and propagation of delamination.

TL;DR: In this article, a review of shape memory alloys (SMAs) constitutive behavior is presented, including shape memory effect, pseudoelasticity, damping capacity and fatigue life.

TL;DR: In this article, the in-plane elastic properties of carbon nanotubes are calculated using a composite cylinders micromechanics technique as a first step in a two-step process.

TL;DR: In this paper, the authors summarized work on the micromechanical modeling of polycrystalline shape memory alloys (SMAs) and compared the predictions of several models directly compared and correlated with experimental results.

TL;DR: In this article, a series of both quasi-static and dynamic uniaxial compression tests on cylindrical samples, using an Instron servohydraulic testing machine and UCSD's enhanced Hopkinson technique, were performed, at initial temperatures in the range of 77-400 K.

TL;DR: In this article, the authors investigate the microstructural basis for a statistical model of compressive failure in a brittle rock, and establish a methodology whereby the Weibull parameters can be inferred from micro-structural data on microcrack density and length statistics for input into finite element simulations.

TL;DR: In this article, a coupled elastoplastic damage model is proposed for semi-brittle materials, which is applied to a specific semibrittle sedimentary rock material, based on which the authors show an important plastic deformation coupled with stress-induced damage corresponding to initiation and growth of microcracks.

TL;DR: In this article, the effect of the reinforcement spatial distribution on the tensile deformation was investigated in a sphere-reinforced ductile-matrix composite through the finite element simulation of a representative volume element of the material.

TL;DR: In this paper, the authors performed tensile tests on cylindrical specimens made of wet and dry concrete with different strain rates from 10 s−1 to 120 s−s−1 by means of a special experimental technique.

TL;DR: In situ neutron diffraction and ultrasonic experimental techniques have been used to investigate the B2M R transformation and R-phase reorientation processes occurring during thermal, mechanical and thermomechanical loading of NiTi shape memory alloy polycrystals as discussed by the authors.

TL;DR: In this article, the contact problem for two deformable solids with FGM coatings is considered under the assumption of plane strain, Coulomb friction and linear nonhomogeneous elasticity.

TL;DR: In this article, a series of physical and numerical tests of uniaxial compression on samples containing a single hole with varied diameters and sample widths are carried out to investigate the splitting failure, the failure modes and strength characterization due to crack growth from such flaw.

TL;DR: In this article, a 3D microstructure is developed based on the 3D location and size distribution of the pores by use of a computational procedure, which is used as inputs to write scripts of I-DEAS to create 3D finite element models which are then examined for basic global and local mechanical properties.

TL;DR: In this article, the deformation behavior associated with initial austenite (A), rhombohedral (R) and martensite (M) phase structures was studied in polycrystalline NiTi shape memory alloy tubes by tensile testing at different temperatures.

TL;DR: In this paper, a low-order statistical correlation function from an experimental microstructure is used to generate, using a simulated annealing algorithm, a spectrum of statistically similar microstructures that are then tested numerically.

TL;DR: In this article, a phenomenological model describing superelasticity, shape memory effect under constant stress and the reorientation process in the martensitic phase is proposed, based on a thermodynamic description of the phase transformation which involves two internal variables: the overall martensite volume fraction and the mean transformation strain.

TL;DR: In this paper, a micromechanics-based continuum damage model for brittle failure of rock is proposed to provide a numerical tool for analyzing not only the macro-scale mechanical responses of rock under compression such as strength, but also microscopic events, which take place in association with inelastic deformation.

TL;DR: In this article, a boundary effect model for scaling of quasi-brittle fracture is used to study the common size effect on strength and fracture toughness of finite-sized specimens, and the transition from the strength to toughness criterion is then given by the asymptotic solution.

TL;DR: In this article, a self-healing, metal matrix composite reinforced by shape memory alloy wires is simulated using finite element analysis and a one-dimensional constitutive model for SMA behavior is implemented as a user-defined truss element in ABAQUS.

TL;DR: In this paper, the authors investigated the flow behavior of a powder as it is delivered into a confined space from a moving shoe and developed an experimental system to model the filling process.

TL;DR: In this paper, the in-plane quasi-static and dynamic behavior of circular-cell aluminum alloy honeycombs is investigated experimentally and the influence of impact velocity on the localized deformation mode and the plateau stress are found.

TL;DR: In this article, a two-dimensional analytical solution has been obtained under the condition of nonlinear coupled effects of temperature gradient, thermal fatigue, deposited residual stress, thermally grown oxide (TGO) thickening, elasto-plasticity deformation and creep deformation of TBC.

TL;DR: Analytical models and complementary finite element (FEM) calculations are developed to evaluate the influence of Poisson ratio on the mechanical properties of biocomposites with staggered mineral platelets in parallel alignment in a soft protein matrix and it is concluded that the Poisson ratios can play a crucial role.

TL;DR: In this paper, the authors compared the predictions of the theory of a rigid cone indenting an elastic half space and by assuming that the rigid pyramid could be likened to a cone of a semi-included angle of 70.3°.

TL;DR: In this article, the authors used finite element modeling (FEM) to investigate the mechanical behavior of a thin film on a substrate composites during the penetration of a rigid tip.

TL;DR: In this article, the thermomechanical response of Nitronic-50 stainless steel was analyzed using uniaxial compression tests on cylindrical samples, using an Instron servohydraulic testing machine and an enhanced Hopkinson technique.

TL;DR: In this article, a critical evaluation of the statistics of the fatigue strength distribution as determined by the staircase (or up-and-down) method is presented, and the effects of test parameters (namely, step size and sample size) were analyzed using numerical simulation to determine the accuracy of fatigue strength standard deviation calculations using traditional staircase statistics, resulting in a quantification of standard deviation bias as a function of step size.

TL;DR: Rafii-Tabar et al. as mentioned in this paper used a molecular dynamics simulation method to model mode I crack propagation in plates containing nanoscale clusters of impurities located in the vicinity of the crack tip.

TL;DR: In this article, the effect of the constant external stress on the magnetic-field-controlled strain response during the cycling in magnetic field in Ni-Mn-Ga alloys has been investigated.

TL;DR: In this article, a thermodynamics-based damage mechanics rate dependent constitutive model is used to simulate experiments conducted on thin layer eutectic Pb/Sn solder joints and the model is implemented into the commercial finite element code ABAQUS via its user material subroutine capability and validated against experimental results.