Results 211 to 220 of about 351,149 (262)
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A new dwell sensitivity damage parameter
Materials & Design, 2004Abstract Published dwell-fatigue data were compiled from various sources for a number of materials such as copper alloys (NARloy-Z, AMZIRC), steel alloys (9Cr–1Mo), and nickel based alloys (IN 100, Rene 95, Waspaloy). In general, dwell-times were found to be detrimental to the fatigue life of materials, but the exact extent of the effect varies ...
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International Journal of Damage Mechanics, 1992
Identification of the evolution of the damage variable, D, in continuum creep damage theory was developed directly from the metallographical A-parameter. As the observed fraction of cavitated grain boundaries on the observation plane, A-parameter was first related to the cavity area fraction on the grain boundary facet planes by perform ing a ...
S. Murakami, Y. Liu, Y. Sugita
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Identification of the evolution of the damage variable, D, in continuum creep damage theory was developed directly from the metallographical A-parameter. As the observed fraction of cavitated grain boundaries on the observation plane, A-parameter was first related to the cavity area fraction on the grain boundary facet planes by perform ing a ...
S. Murakami, Y. Liu, Y. Sugita
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Influence of Cavity Shape on Damage Parameter
Journal of Applied Mechanics, 1985The relation between cavity shape and damage parameter is analyzed for a cavitated material. The matrix consists of isotropic, incompressible power law creeping material. The cavities are assumed to be either cylindrical or spheroidal in shape and to be well separated. Damage is defined here from the creep rate equation postulated by Rabotnov.
S. Jansson, U. Stigh
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Radiation damage parameters in multicomponent nonmetals
Journal of Nuclear Materials, 1981Abstract Evaluations of contributions to radiation damage parameters in nonmetals are made for several neutron and gamma-ray interactions. Damage parameters for C, Al2O3, Si3N4, and MgAl2O4 are evaluated for neutron spectra from the EBR-II, ORR, and LPTR reactors, for a hypothetical first-wall fusion spectrum, for a 14-MeV neutron spectrum, and for a
G.F. Dell, A.N. Goland
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Measuring of Damage Parameters in Adhesive Bonding
Key Engineering Materials, 2006In this paper, the characterisation of damage in an epoxy adhesive has been investigated. Bulk adhesive samples were used in this study for two reasons; firstly the stress distribution in the bulk adhesive sample is simpler than that in a joint, secondly, the specimen’s dimensions meet fatigue test specimen standards. Low cycle fatigue (LCF) tests with
I. Hilmy +3 more
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Parameter Identification of a Plastic Damage Model
Applied Mechanics and Materials, 2014Studies on parameter identification of a plasticity-based damage constitutive model for concrete are presented in this paper. Differences between the stress-strain curves experimentally obtained and the ones numerically obtained at local level were used as the objective functional of a regularized least square method.
Xin Pu Shen, Xiao Chun Wang
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Parameter Sensitivities to Damage Progression in Structures
Volume 11: Mechanics of Solids, Structures and Fluids, 2009Variations in the natural frequency and damping coefficients with cyclic fatigue testing in steel and composite beams carrying a lumped mass are assessed. The identification of these parameters is performed by exploiting the nonlinear behavior of the beam-mass system and matching an approximate solution of the representative model with quantities ...
Giancarlo G. Bordonaro, Muhammad R. Hajj
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Influence of damage in the acoustic emission parameters
Cement and Concrete Composites, 2013Abstract Acoustic emission (AE) is a Non Destructive Inspection Technique, widely used for monitoring of structural condition of different materials like concrete, masonry and rock. It utilizes the transient elastic waves after each fracture occurrence, which are captured by sensors on the surface.
CARPINTERI, Alberto +5 more
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Effect of Triaxiality on Damage Parameters in Adhesive
Key Engineering Materials, 2007Adhesive in joints will have complex stress state rather than bulk adhesives. This will lead to the assumption behind bulk adhesive that triaxiality function (Rv) is equal to one (uni-axial stress state) is not valid anymore. In this paper, new procedure to find damage parameters α and β for single-lap joints has been developed based on global damage ...
I. Hilmy +4 more
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A variable parameters damage model for concrete
Engineering Fracture Mechanics, 2020Abstract A novel four-parameters damage constitutive model for concrete in strain space is proposed in this paper. It is based on the Heish-Ting-Chen constitutive model and is derived in the framework of the thermodynamics of irreversible process. Because tension damage is a major fracture mode in concrete used for hydraulic structures, an equivalent
Huijun Qi +5 more
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