A postdoctoral position in the field of Computational damage geomechanics is open at Université Côte d'Azur.
This project is the result of a collaboration between Geoazur at Université de Nice, the Centre for Material Forming (CEMEF) at Mines ParisTech and the Laboratoire Jean-Alexandre Dieudonné (LJAD) at Université de Nice.
The implicit implementation of creep in abaqus requires dh/d(\delta \epsilon_c ) as Jacobian in Newton-Raphson's iteration. The derivative can be expanded as shown in the figure attached. The term dh/dq, the one underlined by a green stroke, is expected to be provided by users through specifying DECRA, whereas the term dq/d(\delta \epsilon), underlined by a red one, is confusing me. It seems that that term is computed by Abaqus but I have no idea how it is done. The same question applies to the last derivative on the right hand side.
Thank you very much !
Dear All,
I am modelling a 3 point bend specimen with Cohesive elements tied to the upper and lower halves of the specimen in 2d.
The problem is that the CZ elements perform properly only for a combination of element sizes, i.e. a combination of element size of structure and CZ elements, for instance in my case the structure/specimen element size is 0.2mm and CZ is 0.001 or 0.002. For any other combination the adjacent elements bend as shown in the attached image.
I will be glad if someone could explain this behaviour and the solution.
ttps://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201806698
Yuan-Fang Zhang, Ningbin Zhang, Hardik Hingorani, Ningyuan Ding, Dong Wang, Chao Yuan, Biao Zhang, Guoying Gu,* and Qi Ge*
I hope some of you may find this work interesting. We show that kinematic hardening effects play a significant role in monotonic/static fracture.
Steady-state fracture toughness of elastic-plastic solids: Isotropic versus kinematic hardening
K.J.Juul, E.Martínez-Pañeda, K.L.Nielsen, C.F.Niordson
Engineering Fracture Mechanics, 207, pp. 254-268 (2019)
Volume 207, 15 February 2019, Pages 254-268
In this manuscript with Lev Truskinovsky, we developed a new nonlinear theory of large-strain incompatible surface growth. Surface growth is a crucial component of many natural and artificial processes from cell proliferation to additive manufacturing. In elastic systems, surface growth is usually accompanied by the development of geometrical incompatibility leading to residual stresses and triggering various instabilities. Here we developed a nonlinear theory of incompatible surface growth which quantitatively linkes deposition protocols with post-growth states of stress.
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.255304
Accelerated Search and Design of Stretchable Graphene Kirigami Using Machine Learning
P.Z. Hanakata, E.D. Cubuk, D.K. Campbell and H.S. Park
