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Rethinking Gradient Projection Continual Learning: Stability/Plasticity Feature Space Decoupling
Computer Vision and Pattern Recognition, 2023Continual learning aims to incrementally learn novel classes over time, while not forgetting the learned knowledge. Recent studies have found that learning would not forget if the updated gradient is orthogonal to the feature space.
Zhengfu Zhao +6 more
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On scale invariance in anisotropic plasticity, gradient plasticity and gradient elasticity
International Journal of Engineering Science, 2009A simple but robust scale invariance argument earlier used to derive flow rules for macroscopic kinematic hardening plasticity from the configuration of single slip is now applied to consider yielding of fiber reinforced composites as first pioneered, on a purely phenomenological basis, by Tony Spencer and his co-workers.
Elias C. Aifantis, Elias C. Aifantis
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, 2020
In this contribution, we show that the distortion gradient plasticity recently proposed by our group, characterised by a higher-order plastic potential leading to reliable predictions under non-proportional loading, can predict experimental data of ...
A. Panteghini, L. Bardella
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In this contribution, we show that the distortion gradient plasticity recently proposed by our group, characterised by a higher-order plastic potential leading to reliable predictions under non-proportional loading, can predict experimental data of ...
A. Panteghini, L. Bardella
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On standard gradient plasticity and visco-plasticity
International Journal of Solids and Structures, 2021Abstract This paper is devoted to the standard theory of gradient plasticity and visco-plasticity, cf. Gudmundson (2004), Fleck and Willis (2009) and the quoted references. Within the framework of the generalized standard materials and the generalized principle of virtual work, our attention is focussed on the mathematical basis of the theory in ...
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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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Stability of strain-gradient plastic materials
Journal of the Mechanics and Physics of Solids, 2011Abstract 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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On boundary conditions and plastic strain-gradient discontinuity in lower-order gradient plasticity
Journal of the Mechanics and Physics of Solids, 2004Through linearized analysis and computation, we show that lower-order gradient plasticity is compatible with boundary conditions, thus expanding its predictive capability. A physically motivated gradient modification of the conventional Voce hardening law is shown to lead to a convective stabilizing effect in 1-D, rate-independent plasticity.
Sunil Saigal +3 more
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Energetic approach to gradient plasticity
ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 2010AbstractWe formulate a problem of the evolution of elasto‐plastic materials subjected to external loads in the framework of large deformations and multiplicative plasticity. Our model includes gradients of the plastic strain and of hardening variables. We prove the existence of the so‐called energetic solution.
Martin Kružík +2 more
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Formulations of Strain Gradient Plasticity
2011In 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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