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Showing 1 to 14 of 14 for “"micromechanics model"”.
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Effect of fiber/Matrix Interphase on the Long Term Behavior of Cross-Ply Laminates
… exhibits a global strain conuolled failure. A micromechanics model was developed to investigate the role of the interphase on the tensile strength of unidirectional laminates. A new parameter called the ‘efficiency of the interface’, is introduced in the model. A simple scheme that uses the …
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Nonlinear probabilistic finite element modeling of composite shells
… shear deformable kinematics, forms the modeling foundation. The first-order second-moment technique for probabilistic finite element analysis of random fields is employed and results are presented in the form of mean and variance of the structural response. The effects of material …
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Modeling the effect of debonding on the constitutive response of heterogeneous materials
… Theory of Homogenization (MTH) and a micromechanics model based on Mori-Tanaka homogenization. The rigorous mathematical framework of MTH couples the macroscale and the microscale through asymptotic analysis. MTH-based finite element simulations, performed on a periodic unit cell, …
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Investigation of Residual Stresses in Shape Memory Alloy (Sma) Composites
A three-phase concentric cylinder micromechanics model and an SMA composite thermoelastic beam theory were developed to analyze the micromechanical and structural-level thermal and transformational stresses for nitinol composites induced by nitinol wires embedded in a host matrix. A series of …
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Micromechanics-based approach to predict strength and stiffness of composite materials
… behavior. Therefore, it is vital to use a micromechanics model to calculate stress and displacement variations. In this study, the strength and stiffness of polymer matrix composites will be determined. To accomplish this, a variational model which calculates microstresses and strains due …
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Elastoplastic response of unidirectional graphite/aluminum under combined tension-compression cyclic loading
… induced in each phase of the composite. The micromechanics model proposed by Aboudi was subsequently employed to correlate the experimental and analytical results at room temperature. A semi-inverse methodology was incorporated to determine the in-situ properties of the constituents. …
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Indentation testing of composite materials: a novel approach to measuring interfacial characteristics and engineering properties
… measures of interfacial shear strength. A unique micromechanics model of the contact situation predicted failure events and trends consistent with the observed data from the CBIT. The present elastic model predicted an interfacial shear strength slightly higher than those reported in the …
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Finite element micromechanics modeling of inelastic deformation of unidirectionally fiber-reinforced composites
… path. The approach was employed to solve a micromechanics boundary value problem of a cyclically loaded unidirectional boron/6061 aluminum composite. All the FE results consistently demonstrate superior numerical stability and efficiency of the proposed method. Extensions of the method to …
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Multiscale Modeling of CNT-Polymer Nanocomposites and Fuzzy Fiber Reinforced Polymer Composites for Strain and Damage Sensing
… in resistance. The first focus of the work is on modeling the piezoresistive response of the CNT-polymer nanocomposites by using computational micromechanics techniques based on finite element analysis. The in-plane, axial, the three dimensional piezoresistive responses of the CNT-polymer …
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A Micromechanics Study on Ferroelectrics and Multiferroic Composites
… exponential functions into the micromechanics-based model to establish the nonlinear constitutive relations of a ferroelectric material. Then, for the two-phase ferroelectric composites, the Mori-Tanaka Method can be applied to analyze and solve the overall effective …
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Electromechanical response of textured ferroelectric PZT thin film stacks
… film thickness and grain size was successfully modeled, providing insight into the deformation behavior of polycrystalline metal films grown epitaxially on polycrystalline underlayers. Mechanical experiments on (SiO2-TiO2-Pt-PZT) and full PZT stacks (SiO2-TiO2-Pt-PZT-Pt-ALD) showed that the …
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Chemomechanical modeling of hydrogen-induced degradation at high temperatures
… temperatures in the range of 400 to 600 °C. The model accounts for the coupled effects of creep and grain boundary diffusion, incorporating the influence of stress triaxiality ahead of the crack tip on bubble evolution. By treating the time to microcrack formation as a conservative estimate of …
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Machine learning predictions of crack paths in brittle and ductile media
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Characteristics and modeling of the fracture properties of polymer-silica microparticulate composites via macroscopic scratch tests
… glass bead inclusions is developed as a model material. The hardness and fracture toughness of composites containing 0%, 5%, 10%, and 20% spherical glass bead inclusions by volume are analyzed using a built-in- house macroscopic scratch test device. The elastic modulus and compressive …