... and thermal creep data before and after irradiation were analyzed to provide further information about the materials' deformation behavior. The extensive tensile database for V-4Cr-4Ti was used to determine the key material parameters in physically-based constitutive equations. The resultant constitutive...

... of materials. State variable constitutive equations based on a viscoplasticity approach have been developed to model the deformation of the polymer matrix. The constitutive equations are then combined with a mechanics of materials based micromechanics model which utilizes fiber substructuring to predict...

.... cyclic loading constitutive equations elasto-viscoplastic material finite elements numerical algorithms Markus Arzt, 1 Wolfgang Brocks, 1and Tainer Mohr I A Newton Algorithm for Solving Non-Linear Problems in Mechanics of Structures Under Complex Loading Histories REFERENCE: Arzt, M., Brocks, W...

... and predictions show that VBOP is competent at modeling the behavior of Nylon 66 and other solid polymers. solid polymers nylon constitutive equations viscoplasticity viscoelasticity numerical experiments overstress model rate dependence creep relaxation Erhard Krempl 1 and Kwangsoo Ho 2...

... database and life prediction methodology for high temperature structural ceramics. silicon nitride creep creep-rupture constitutive equations multiaxial deformation Jow-Lian Ding I, Kenneth C. Liu 2, and Charles R. Brinkman 2 A COMPARATIVE STUDY OF EXISTING AND NEWLY PROPOSED MODELS FOR CREEP...

... with the lowest pressure, producing reversed yielding, which in the past often has been regarded as optimal pressure. autofrettage residual stresses notch strains cyclic hardening cyclic softening constitutive equations Volker B. K6ttgen, 1Michael Schdn, ~and T i m m Seeger 2 Application...

... shear stress paths constitutive equations anisotropy Adel S. Saada^ STATE-OF-THE-ART PAPER Hollow Cylinder Torsional Devices: Their Advantages and Limitations REFERENCE: Saada, A. S., "HoUow Cylinder Torsional Devices: Their Advantages and Limitations," Advanced Triaxial Testing of Soil and Rock...

... and on constitutive modeling of deformation in BCC metals. steels dynamic plasticity shear properties strain rate sensitivity constitutive equations /. Klepaczko^ and J. Dufjy^ Strain Rate History Effects in Body-Centered-Cubic Metals REFERENCE: Klepaczko, J. and Duffy, J., "Strain Rate History Effects...

... is determined from rate theory. The constitutive equations obtained in the study are in the form of ordinary differential equations and are based on a rigorously defined physical model. Numerical solutions of the equations applied to a system of two consecutive energy barriers show excellent agreement...

... The use of back stress terms in constitutive equations implies the existence of inhomogeneous stresses within the solid. We suggest that such inhomogeneities arise naturally from dislocation processes and are associated with the development of hard and soft regions within the substructure. We...

... no correlation can be found. constitutive equations state variables plastic deformation cyclic deformation recovery cyclic creep mechanical testing annealing A. P. L. Turner^ and Tadashi Hasegawa? Deformation Microstructures and Mechanical Equations of State REFERENCE: Turner, A. P. L...

... rate resulted. The forms of the constitutive equations which best fitted the deformation behaviors of low-carbon steel and 5182-0 aluminum were completely different and could be rationalized in terms of the operative microscopic deformation mode. It appears that it may be possible to infer...

...) is introduced. It is shown to vary with overstress or strain rate. KEY WORDS: stainless steel, Ti-alloy, rate dependence, creep, relaxation, servocontrolled testing, constitutive equations, viscoelasticity, viscopiasticity ServocontroUed mechanical testing machines using feedback principles have been frequently...

...; this is in agreement with predictions of the model. Finally, the peak back stresses observed at a given strain range are observed to increase along with the isotropic strength level; this behavior differs from that predicted by the constitutive equations. constitutive equations mechanical properties cyclic...

... and undrained, monotonic and cyclic loading conditions. The use of the proposed formulation for solving boundary value problems of interest in soil mechanics is illustrated. consolidation constitutive equations diffusion finite elements geotechnical engineering plasticity porous media J. H...

... to be very promising in breeder reactor design analysis. constitutive equations neutron irradiation effects tensile strength ductility transient flow strength G. L. Wire' State Variable Description of 316 Stainless Steel Post irradiation Mechanical Properties REFERENCE: Wire, G. L., "State...

... plasticity creep irradiation constitutive equations S. Oldberg, Jr A. K. Miller,^ and G. E. Lucas^ Advances in Understanding and Predicting Inelastic Deformation in Zircaloy REFERENCE: Oldberg, S., Jr., Miller, A. K., and Lucas, G. E., "Advances in Understanding and Predicting Inelastic Deformation...

... Substantial progress has been made towards developing a constitutive equation for Zircaloy which is both accurate and applicable to a wide variety of situations and a broad range in temperature. Starting with a previously presented phenomenological model (MATMOD) for nonelastic deformation under...

... directed to the possibility of environment significantly affecting results. The fracture mechanics approach to estimating rates of crack propagation is discussed. For computer analyses of highly critical sections of components, formulation of constitutive equations on a continuum-metallurgical basis...