Results 1 - 10 of 522

Multiaxial Fatigue Damage Criterion

by F. Ellyin, Mem Asme, K. Golost , 1988
"... A multiaxial fatigue failure criterion is proposed based on the strain energy density damage law. The proposed criterion is hydrostatic pressure sensitive; includes the ef-fect of the mean stress, and applies to materials which do not obey the idealized Masing type description. The material constant ..."
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A multiaxial fatigue failure criterion is proposed based on the strain energy density damage law. The proposed criterion is hydrostatic pressure sensitive; includes the ef-fect of the mean stress, and applies to materials which do not obey the idealized Masing type description. The material

DAMAGE CRITERIONS IN THERMO-MECHANICAL FATIGUE MODELS

by Cristiana Delprete , Carlo Rosso , Raffaella Sesana
"... ABSTRACT In the present paper different damage criterions, recorded in literature, are compared, distinguishing the philosophical approach to thermo-mechanical fatigue (TMF) in energetic methods and phenomenological methods. TMF is the combination of mechanical and thermal stresses that takes place ..."
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ABSTRACT In the present paper different damage criterions, recorded in literature, are compared, distinguishing the philosophical approach to thermo-mechanical fatigue (TMF) in energetic methods and phenomenological methods. TMF is the combination of mechanical and thermal stresses that takes

A Multiscale Damage Criterion for Fatigue Life Prediction in Metallic Materials

by unknown authors
"... In this paper a multiscale damage criterion for fatigue life prediction is introduced. A damage evolution rule based on strain energy density is modified to incorporate crystal plasticity at the microscale. A damage tensor that indicates the local damage state is derived using optimization theory. L ..."
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In this paper a multiscale damage criterion for fatigue life prediction is introduced. A damage evolution rule based on strain energy density is modified to incorporate crystal plasticity at the microscale. A damage tensor that indicates the local damage state is derived using optimization theory

Damage Criterion for Prediction of Ductile Failure during Severe Plastic Deformation

by R Lapovok
"... ABSTRACT Severe Plastic Deformation (SPD) processes are known to introduce large plastic deformation into material resulting in extreme grain refinement to nanometer range and significant enhancement of mechanical properties (e.g. strength) To design the tooling, to investigate parameters of proce ..."
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tensors and temperature distribution within the deformed material. However, to design the process against ductile failure of the workpiece, a single criterion is needed, which relates all output variables in a single scalar function. For this purpose the damage accumulated during plastic deformation

Critical Strain Based Ductile Damage Criterion and its Application to Mechanical Damage in Pipelines

by Ming Gao, Ravi Krishnamurthy, Samarth T, Udayasankar Arumugam
"... Strain based assessment of mechanical damage in pipelines requires a failure criterion for cracking based on plastic damage. Several criteria have been proposed by industry codes such as B31.8 and in the literature. However, these criteria essentially are based on engineering decisions. In this pape ..."
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Strain based assessment of mechanical damage in pipelines requires a failure criterion for cracking based on plastic damage. Several criteria have been proposed by industry codes such as B31.8 and in the literature. However, these criteria essentially are based on engineering decisions

Damage-based Formability Analysis for TWBs

by L. C. Chan, C. H. Cheng, M. Jie, C. L. Chow - International Journal of Damage Mechanics , 2005
"... ABSTRACT: This paper describes a damage-based formability analysis for tailor-welded blanks (TWBs) using an anisotropic damage model and damage criterion for localized necking. The damage model and criterion are coupled into finite element code to simulate the stamping process of JIS G3141 steel TWB ..."
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ABSTRACT: This paper describes a damage-based formability analysis for tailor-welded blanks (TWBs) using an anisotropic damage model and damage criterion for localized necking. The damage model and criterion are coupled into finite element code to simulate the stamping process of JIS G3141 steel

Criterion Auctions

by Peter Cramton, Allan T. Ingraham, Hal J. Singer, Peter Cramton, Allan T. Ingraham, Hal J. Singer , 2008
"... This paper examines the impact of an incumbent carrier’s participation in two simultaneously conducted auctions: one set-aside for non-incumbents and one open to all carriers. This paper estimates the extent to which prices in the closed auction were inflated by the participation of incumbents. This ..."
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, non-incumbents won fewer licenses and paid more for what they won. The econometric techniques employed here to estimate prices in a “but for ” world could be replicated in future damage analysis. Finally, this paper suggests an alternative method of screening bidders seeking access to set

A Strain Energy Based Criterion for Multiaxial Fatigue Failure

by Fernand Ellyin
"... Abstract. Research on the fatigue resistance of mechanical components / structures has been proceeding for nearly a century and half. Yet, there is no universally agreed upon damage criterion which can predict most aspects of fatigue failure. The reason is the complexity of phenomenon and its depend ..."
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Abstract. Research on the fatigue resistance of mechanical components / structures has been proceeding for nearly a century and half. Yet, there is no universally agreed upon damage criterion which can predict most aspects of fatigue failure. The reason is the complexity of phenomenon and its

A Multiple-Damage Location Assurance Criterion Based on Natural Frequency Changes

by T. Contursi, A. Messina, E. J. Williams - Journal of Vibration and Control , 1998
"... Abstract: A new method for locating multiple damage sites in elastic structures is introduced. It uses only the natural frequencies for diagnosis and obviates the need to have complete experimental mode shapes. Results from three damaged structures are presented. A 2-bar truss illustrates the basis ..."
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Abstract: A new method for locating multiple damage sites in elastic structures is introduced. It uses only the natural frequencies for diagnosis and obviates the need to have complete experimental mode shapes. Results from three damaged structures are presented. A 2-bar truss illustrates the basis

Continuum damage mechanics for softening of brittle materials

by W. A. M. Brekeimans, P. J. G. Sehreurs, J. H. P. De Vree, The Netherl , 1991
"... Summary. Continuum damage theory is used to model the failure behaviour of brittle materials. In the constitutive equations adamage parameter is incorporated. A damage criterion is postulated such that large differences between tension and compression strength can be described. A damage growth law i ..."
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Summary. Continuum damage theory is used to model the failure behaviour of brittle materials. In the constitutive equations adamage parameter is incorporated. A damage criterion is postulated such that large differences between tension and compression strength can be described. A damage growth law
Results 1 - 10 of 522