Constitutive modeling of the visco-plastic response of Hastelloy-X and Aluminium alloy 8009

Article Abstract:

Use of the Bodner Partom unified constitutive model enables the characterization of the viscoplastic behaviour of advanced, high temperature, metallic Hastelloy-X and Aluminium 8009 alloys. Data from the isothermal, uniaxial, monotonic tension and compression tests and isothermal creep tests gives the Bodner Partom model parameters. The model parameters obtained from isothermal uniaxial tensile tests for Hastelloy-X are comparable to the experimental stress-strain data. Uniaxial compression test data show the strain-hardening nature of the Aluminum 8009 alloy.

Observations, Structural analysis (Engineering), Heat resistant alloys, Superalloys, Parameter estimation

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Use of the shadow optical method of caustics to predict fatigue crack growth in compression

Article Abstract:

The feasibility of using the shadow optical method of caustics for analyzing the fatigue crack growth process in metals under compressive loadings is discussed. Experiments are carried out wherein single edge notch specimens are subjected to a single compressive overload and fatigue cycling. A camera is used to monitor and record the materials' caustic images at various intervals. Results indicate that the shadow optical method is useful for predicting fatigue crack propagation in metals.

Metals, Metal fatigue, Optical measurements, Optical measurement

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Finite element analysis of whisker-reinforced SiC/Al composites subjected tocryogenic temperature thermal cycling

Article Abstract:

The behavior of whisker-reinforced SiC/Al composite materials during the various phases of thermal cycling is studied using the finite element method (FEM). Three-dimensional elastoplastic FEMs areemployed to analyze the response of a model composite system at a starting stress-free temperature of 500 degrees centigrade. Results reveal that a cooling cycle to cryogenic temperatures has considerable effects on the materials' mechanical behavior.

Testing, Composite materials, Finite element method

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