Results 221 to 230 of about 435,912 (264)

Observation of quantum confinement by strain gradients

Physical Review Letters, 1991
We have created one-dimensional quantum wells (quantum wires) by laterally straining a GaAs quantum well with patterned carbon stressors 180 nm in width. We find four well-resolved one-dimensional subbands in the excitation spectra, whose constant spacing of 2.4 meV confirms quantitatively that there is quantum confinement in the parabolic well ...
, Kash, , Van der Gaag BP, , Mahoney, , Gozdz, , Florez, , Harbison, , Sturge   +6 more
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Strain gradients in plasticity

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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An Alternative Decomposition of the Strain Gradient Tensor

Journal of Applied Mechanics, 2001
An alternative decomposition of the strain gradient tensor is proposed in this paper in order to ensure that the deviatoric strain gradient vanishes for an arbitrary volumetric strain field, which is consistent with the physical picture of plastic deformation.
Jiang, H., Huang, Y., Guo, T. F., Hwang, K. C.   +3 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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Strain-gradient extension of hypoplasticity

Acta Mechanica, 2008
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Osinov, V. A., Wu, W.
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Mechanics of Strain Gradient Materials

2020
International ...
Bertram, Albrecht, Forest, Samuel
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Fracture in strain gradient elasticity

Metals and Materials, 1998
Recent experiments have shown that the microscale material behavior is very different from that of bulk materials, and displays strong size effects when the characteristic length associated with the deformation is on the order of microns. Conventional continuum theories, however, can not predict this size dependence because they do not have an ...
K. C. Hwang, T. F. Cuo, Y. Huang, J. Y. Chen   +3 more
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A strain gradient theory of plasticity

International Journal of Solids and Structures, 1970
Abstract A theory which includes first and second strain gradients is proposed as a model for plastic deformations. Heuristic arguments for including the gradients are also given. The main goal is to develop a logical framework in which behavior on a small scale can interact with the response on a larger one.
Dillon, O. W. jun., Kratochvil, J.
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Strain gradient beam element

Finite Elements in Analysis and Design, 2013
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Kahrobaiyan, M. H., Asghari, M., Ahmadian, M. T.   +2 more
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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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