Results 191 to 200 of about 3,870,040 (252)

Computation of brittle fracture propagation in strain gradient materials by the FEniCS library

, 2020
Strain gradient continuum damage modelling has been applied to quasistatic brittle fracture within an approach based on a maximum energy-release rate principle. The model was implemented numerically, making use of the FEniCS open-source library.
E. Barchiesi, H. Yang, C. Tran, L. Placidi, Wolfgang H. Müller   +4 more
semanticscholar   +1 more source

A strain space gradient plasticity theory for finite strain

Computer Methods in Applied Mechanics and Engineering, 2004
Abstract In this paper, an extension to the finite deformation regime of the infinitesimal theories of strain gradient plasticity discussed in a paper by R. Chambon, D. Caillerie and T. Matsushimas [Int. J. Solids Struct. 38 (2001) 8503–8527] is presented which extends and generalizes the previous works of R. Chambon, D. Caillerie and C. Tamagnini [C.
Chambon R., Caillerie D., TAMAGNINI, Claudio   +2 more
openaire   +3 more sources

Strain-gradient extension of hypoplasticity

Acta Mechanica, 2008
The paper presents an extension of the hypoplasticity theory by introducing the second-order gradient of the strain rate into the constitutive equation. The strain-gradient extension is aimed at the adequate modelling of the shear band formation in the post-localization regime.
Wei Wu, V. A. Osinov
openaire   +2 more sources

The development of strain-rate gradients

Acta Metallurgica, 1979
Abstract The development of nonuniformities in tensile deformation and its dependence on material parameters and external conditions have been reanalyzed. It is found that the major influence of strain rate on neck growth is usually through its effect on the rate of strain hardening, rather than on the flow stress itself.
U.F. Kocks, John J. Jonas, H. Mecking
openaire   +2 more sources

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 ...
Yonggang Huang, K. C. Hwang, J. Y. Chen, T. F. Cuo   +3 more
openaire   +2 more sources

Torsion of strain gradient bars

International Journal of Engineering Science, 2011
Abstract The governing differential equation and both classical and non-classical boundary conditions of strain gradient bars are derived using variational approach. A closed-form analytical solution is obtained for static torsion and the characteristic equation, which gives the natural frequencies, is derived and analytically solved for the free ...
S.A. Tajalli, Javad Akbari, M. H. Kahrobaiyan, Mohammad Taghi Ahmadian, M. R. Movahhedy   +4 more
openaire   +2 more sources

Fractional strain-gradient plasticity

European Journal of Mechanics - A/Solids, 2019
We develop a strain-gradient plasticity theory based on fractional derivatives of plastic strain and assess its ability to reproduce the scaling laws and size effects uncovered by the recent experiments of Mu et al. (2014, 2016, 2017) on copper thin layers undergoing plastically constrained simple shear.
C.F.O. Dahlberg, M. Ortiz
openaire   +3 more sources

Multilayer GPLRC composite cylindrical nanoshell using modified strain gradient theory

Mechanics based design of structures and machines, 2019
In this paper, influence of modified strain gradient theory (MSGT) on buckling, free and forced vibration characteristics of the composite cylindrical nanoshell reinforced with graphene nanoplatelet (GPL) in thermal environment is investigated.
Zanyar Esmailpoor Hajilak, Johar Pourghader, Davoud Hashemabadi, Farzaneh Sharifi Bagh, M. Habibi, H. Safarpour   +5 more
semanticscholar   +1 more source

Nonlocal strain gradient-based nonlinear in-plane thermomechanical stability of FG multilayer micro/nano-arches

Archives of Civil and Mechanical Engineering, 2023
Zhicheng Yang, Dogus Hurdoganoglu, S. Sahmani, Abubakar Abdussalam Nuhu, B. Safaei   +4 more
semanticscholar   +1 more source

Strain gradient polarization in graphene

Carbon, 2017
Abstract Flexoelectricity phenomenon is the response of electric polarization to an applied strain gradient and is developed as a consequence of crystal symmetry in all materials. In this study, we show that the presence of strain gradient in non-piezoelectric graphene sheet does not only affect the ionic positions, but also the asymmetric ...
S.I. Kundalwal, S.A. Meguid, G.J. Weng
openaire   +2 more sources