Plastic torsional buckling of thin walled circular cylinders

Ünal, Zarif


Plastic anisotropy induced by strain path changes in BCC metals
Yalçınkaya, Tuncay; Geers, M G D (null; 2008-12-08)
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Undoubtedly, a world without plastic, which is the most important production material in almost every area, seems inconceivable today. The production and consumption chain, by which induced this versatile use, has caused plastic pollution that has devastating effects on the environment and natural ecosystems. In this thesis, which written with the motivation of contributing to the fight against plastic pollution and to be useful developing effective and sustainable policies, plastic pollution and pollutant ...
Plastic slip patterns through rate-independent and rate-dependent plasticity
Lancioni, Giovanni; Yalçınkaya, Tuncay (2014-05-09)
Plastic deformation induces various types of dislocation microstructures at different length scales, which eventually results in a heterogeneous deformation field in metallic materials. Development of such structures manifests themselves as macroscopic hardening/softening response and plastic anisotropy during strain path changes, which is often observed during forming processes. In this paper we present two different non-local plasticity models based on non-convex potentials to simulate the intrinsic rate-...
Plastic slip patterning driven by rate dependent non convex strain gradient plasticity
Yalçınkaya, Tuncay; Geers, M G D (2010-05-17)
The mechanical response of many engineering materials is often influenced by an existing or emerging microstructure (martensite, dislocation sub-structures, voids, shear bands etc.). There have been various approaches to model the formation and evolution of such microstructures which involve coupled models. The difficulty in the modeling of these multi-field coupled problems is the localization of the corresponding field and strain hardening-softening elastoplastic behavior which yields numerical instabilit...
Plastic slip patterning through rate dependent non convex gradient enhanced plasticity
Yalçınkaya, Tuncay; GEERS, M G D (2011-12-09)
The paper presents a non‐convex rate dependent strain gradient plasticity framework for the description of plastic slip patterning in metal crystals. The non‐convexity is treated as an intrinsic property of the free energy of the material. Departing from explicit expressions for the free energy, the non‐convex strain gradient crystal plasticity model is derived in a thermodynamically consistent manner, including the accompanying slip law. For the numerical solution of the problem, the displacement and the p...
Citation Formats
Z. Ünal, “Plastic torsional buckling of thin walled circular cylinders,” Middle East Technical University, 1984.