A viscoplastic theory for anisotropic materials

Article Abstract:

A mathematical model for analyzing the viscoplasticity of cubic single crystals and the CMSX-2 nickel-base superalloy is given. The CMSX-2 is used as the material for turbine blades in aircraft engines. They are two-phased single crystals with an ordered face-centered cubic (FCC) within a coherent FCC solid matrix. A phenomenological method could be used in studying the cubic symmetry of the superalloy. The division of the physical constants in the equation of the model enhances the curve fitting process. The equations used are simple with fewer variables. Results obtained with the model agree with experimental data and with slip theory.

Models, Heat resistant alloys, Superalloys

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Viscoplastic collapse of thin-walled tubes under cyclic bending

Article Abstract:

A curvature-ovalization measurement device was used to determine the response and stability of thin-walled stainless steel tubes when subjected to cyclic bending with different curvature rates. Results show that both the hardening of metal tube and the ovalization of tube cross-section increase with an increase in the applied curvature rate. Moreover, the increase in ovalization reduces the number of cycles to produce buckling.

Research, Stainless steel, Deformations (Mechanics), Deformation, Steel, Stainless, Steel tubes, Steel tube

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Evaluation of flow stresses of tubular materials considering anisotropic effects by hydraulic bulge tests

Article Abstract:

A report on the evaluation of the stress-strain characteristic of tubular materials like annealed AA6011aluminum tubes and SUS409 stainless-steel tubes by using Hill's orthogonal anisotropic theory and hydraulic bulge test is presented.

Analysis, Usage, Stress relieving (Materials), Strains and stresses, Stresses (Materials), Mechanical properties, Finite element method, Stress relaxation (Materials)

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