Results 181 to 190 of about 3,870,040 (252)

Strain gradients in plasticity [PDF]

Acta Mechanica, 1977
An analytical model of a plastically deforming solid is assumed to be a material where the second spatial gradients of strain are included in the constitutive equations. These constitutive equations are combined, in a one dimensional shearing problem, with the second law of thermodynamics and condition of thermodynamic stability. The results are that a
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Nonlocal strain gradient beam model for nonlinear secondary resonance analysis of functionally graded porous micro/nano-beams under periodic hard excitations

Mechanics based design of structures and machines, 2020
Functionally graded porous materials (FGPMs) have a wide range of applications as hollow members in biomedical and aeronautical engineering. In the FGPMs, the porosity is varied over the material volume because of the density change of pores.
A. Fattahi, S. Sahmani, N. Ahmed
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Thermoelastic damping in strain gradient microplates according to a generalized theory of thermoelasticity

Journal of thermal stresses, 2020
This paper deals with the small-scale effects on the thermoelastic damping (TED) in microplates. The coupled equations of motion and heat conduction are provided utilizing the strain gradient theory (SGT) and the dual-phase-lag (DPL) heat conduction ...
Vahid Borjalilou, M. Asghari
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Formulations of Strain Gradient Plasticity

2011
In the literature, different proposals for a strain gradient plasticity theory exist. So there is still a debate on the formulation of strain gradient plasticity models used for predicting size effects in the plastic deformation of materials. Three such formulations from the literature are discussed in this work.
Forest, Samuel, Bertram, A.
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Adjusting the electromechanical coupling behaviors of piezoelectric semiconductor nanowires via strain gradient and flexoelectric effects

, 2020
In this paper, the strain gradient is introduced to tune the semiconducting performance of piezoelectric semiconductor (PSC) nanowires by changing their cross sections.
C. Ren, Kaican Wang, Baolin Wang
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Stability of strain-gradient plastic materials

Journal of the Mechanics and Physics of Solids, 2011
Abstract A formulation of Fleck and Willis (2009a,b) for strain-gradient plasticity has been adapted to provide possible descriptions for materials that initially strain-harden but eventually soften. In the absence of gradient terms, such material is unstable for any wavelength and subject to localization in the softening regime.
Dal Corso, Francesco, J. R. Willis
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A new Bernoulli–Euler beam model based on a reformulated strain gradient elasticity theory

, 2020
A new non-classical Bernoulli–Euler beam model is developed using a reformulated strain gradient elasticity theory that incorporates both couple stress and strain gradient effects.
G. Zhang, X.-L. Gao
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Bending, free vibration and buckling analyses of AFG flexoelectric nanobeams based on the strain gradient theory

Mechanics of Advanced Materials and Structures, 2020
In this article, on the basis of Bernoulli-Euler beam theory, an axially functional gradient (AFG) flexoelectric nanobeam model incorporating strain gradient elasticity effect is established.
Xie Zhao, S. Zheng, Zongjun Li
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A Strain-Rate Gradient Theory of Plasticity and its Comparison with Strain Gradient Theories

Applied Mechanics and Materials, 2013
Gradient theories of plasticity play an important role in the description of inelastic behavior of materials. Usually, these theories involve space derivatives of stress or strain. On the other hand, conventional theories of plasticity can be divided into two groups, flow and deformation theories.
Sergei Alexandrov, Elena Lyamina, Yeau-Ren Jeng   +2 more
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Strain gradient thermopiezoelectric materials

Journal of Thermal Stresses, 2023
Results from the linear theory of thermopiezoelectricity are discussed in this article. A brief introduction to dielectric materials and the phenomenon of direct and inverse piezoelectricity is given. Then, a general theory of thermopiezoelectricity for strain gradient materials is given, where the second gradient of the displacement field and electric
Tibullo V., Nunziata M.
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