Journal of Engineering Materials and Technology
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Application of Finite Element Calculations to Residual Stress MeasurementsThe use of finite element calculations is assessed as a means of analysis of the strain relaxation data from a measurement of residual stress by a material removal method. This application is important because it allows a greater flexibility of choice for specimen shape, materials, and experimental procedure than would be possible if only analytic or experimental calibrations are used. Thr... ...
Journal of Engineering Materials and Technology - Tập 103 Số 2 - Trang 157-163 - 1981
In-Plane Stiffness and Yield Strength of Periodic Metal HoneycombsIn-plane mechanical properties of periodic honeycomb structures with seven different cell types are investigated in this paper. Emphasis is placed on honeycombs with relative density between 0.1 and 0.3, such that initial yield is associated with short column compression or bending, occurring prior to elastic buckling. Effective elastic stiffness and initial yield strength of these metal h... ...
Journal of Engineering Materials and Technology - Tập 126 Số 2 - Trang 137-156 - 2004
On the Prediction of Stress Relaxation From Known Creep of Nonlinear MaterialsA method to predict the nonlinear relaxation behavior from creep experiments of nonlinear viscoelastic materials is presented. It is shown that for given nonlinear creep properties, and creep compliance represented by the Prony series, the Schapery creep model can be transformed into a set of first order nonlinear equations. The solution of these equations enables the obtaining of the nonl... ...
Journal of Engineering Materials and Technology - Tập 119 Số 2 - Trang 121-124 - 1997
Further Developments in Anisotropic PlasticityA simple extension of Hill’s formulation for anisotropic plasticity which accounts for the distortion of the yield surface, Mij, the strength differential between tension and compression, αi and the effective size of the loading surface, k, has been proposed. These material parameters, Mij, αi, and k, define the initial state of the material and vary with plastic deformation. The parameter... ...
Journal of Engineering Materials and Technology - Tập 100 Số 3 - Trang 294-302 - 1978
Representation of the High-Temperature Tensile Behavior of Reannealed Type 304 Stainless Steel by the Voce EquationTensile tests were performed on a reference heat of type 304 stainless steel (heat 9T2796) in the laboratory reannealed condition. Testing temperatures ranged from 25 to 760 deg C (77 to 1400 deg F) and strain rates were varied from 1.5 × 10−6 to 8.3 × 10−2/s. Several models were developed to represent the tensile curves, and each model was restricted to a specific range of applicability. ... ...
Journal of Engineering Materials and Technology - Tập 97 Số 2 - Trang 98-106 - 1975
The Influence of Aging on Critical Transformation Stress Levels and Martensite Start Temperatures in NiTi: Part I—Aged Microstructure and Micro-Mechanical ModelingTransmission electron microscopy is used to determine the microstructures of a Ti-50.8 at% Ni alloy given different aging treatments. Two different peak-aging treatments are shown to result in disk shaped semi-coherent Ti3Ni4 precipitates with a diameter ranging from 50 nm to 200 nm depending on the aging temperature. In the peak-aged materials, strong strain fields are clearly visible on ... ...
Journal of Engineering Materials and Technology - Tập 121 Số 1 - Trang 19-27 - 1999
Material Characterization of SMA Actuators Under Nonproportional Thermomechanical LoadingThe application of SMA actuators in smart structures usually involves thermally induced phase transformation with a variable applied stress in SMA actuators, resulting in thermomechanical nonproportional loading of SMAs in stress-temperature space. To investigate the constitutive response of SMAs under thermomechanical nonproportional loading, experiments for thermally induced phase transf... ...
Journal of Engineering Materials and Technology - Tập 121 Số 1 - Trang 75-85 - 1999
Mechanical Behavior of an Ni-Ti Shape Memory Alloy Under Axial-Torsional Proportional and Nonproportional LoadingSeveral biaxial proportional and nonproportional loading experiments are reported for thin-wall tubes of a pseudoelastic Ni-Ti shape memory alloy (SMA). In addition to the mechanical behavior, temperature was measured during the experiments. It is shown that the phase transformation exhibits asymmetrical behavior in the case of tension-compression cycling. The transformation strain rate is... ...
Journal of Engineering Materials and Technology - Tập 121 Số 1 - Trang 9-18 - 1999
Dislocation-Stacking Fault Tetrahedron Interactions in CuIn copper and other face centered cubic metals, high-energy particle irradiation produces hardening and shear localization. Post-irradiation microstructural examination in Cu reveals that irradiation has produced a high number density of nanometer sized stacking fault tetrahedra. The resultant irradiation hardening and shear localization is commonly attributed to the interaction between st... ...
Journal of Engineering Materials and Technology - Tập 124 Số 3 - Trang 329-334 - 2002
Elasto-Plastic Analysis of the Peel Test for Thin Film AdhesionAnalyses have been made to extract the objective interfacial fracture toughness from the peel strength of very thin metallic films. An elastoplastic bending model of the adherend film has been employed in the analyses applying the fracture mechanics concept of steady-state interfacial crack growth. The analytic result finally shown is a universal peel diagram where the objective interfacia... ...
Journal of Engineering Materials and Technology - Tập 110 Số 3 - Trang 266-273 - 1988
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