Results 181 to 190 of about 6,620 (226)

Strain ratchetting of titanium upon reversible alloying with hydrogen

Philosophical Magazine A, 2001
Abstract During cyclic hydrogen charging (e.g., in metal–hydride systems), internal stresses and strains can be developed due to lattice swelling and/or phase transformation (e.g., allotropic transformation or hydride precipitation). We examine macroscopic plastic deformation due to such internal stresses (strain ratctetting) in the Ti–H system, where ...
M. Frary, C. Schuh, D. C. Dunand
openaire   +2 more sources

Ratchetting characteristics of 316FR steel at high temperature, part I: Strain-controlled ratchetting experiments and simulations

International Journal of Plasticity, 1998
The paper is concerned with characteristics in ratchetting of 316FR steel at high temperature. In Part I, first, by discussing isothermal and nonisothermal “strain-controlled” ratchetting experiments, it is shown that 316FR steel exhibits the almost perfect closure of stress and strain hysteresis loops as well as the isotropic hardening depending on ...
Ohno, N., Abdel-Karim, M., Kobayashi, M., Igari, T.   +3 more
openaire   +1 more source

Ratchet Boundary Evaluation and Comparison With Ratcheting Experiments Involving Strain Hardening Material Models

Volume 1: Codes and Standards, 2012
Pressure components in nuclear power plants are designed to prevent the failure mechanism of incremental deformation or “ratcheting” due to the simultaneous application of mechanical loads such as pressure and cyclic loads. Design criteria using elastic methods that are specified in NB-3200 of ASME Section III Code are derived from a perfectly-plastic ...
H. Indermohan, W. Reinhardt
openaire   +1 more source

A Fast Method for Ratchetting Strain Prediction

Volume 2: Computer Technology, 2006
A time efficient method for predicting ratchetting strain is proposed. By finding the ratchetting rate, at only a few cycles, the ratchetting strain of any cycle can be determined. It is shown that a trajectory of the origin of stress may be defined in the deviatoric stress space as the ratchetting progresses.
Mohammad Noban, Hamid Jahed
openaire   +1 more source

Ratcheting Responses of Strain Hardening Plasticity Models

Volume 1: Codes and Standards, 2011
Nuclear reactor components are often subjected to combinations of sustained and cyclic stresses due to the application of internal pressure and transient temperature loads. During the thermal transients, the interaction of such stresses could cause cyclic plastic deformation, which may either lead to shakedown or ratchetting behavior.
H. Indermohan, W. Reinhardt
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Computational modeling of inelastic large ratcheting strains

International Journal of Plasticity, 2005
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Johansson, Göran, Ekh, Magnus, Runesson, Kenneth   +2 more
openaire   +1 more source

Electronic Speckle‐Pattern Interferometry Measurements of Structural Ratcheting Strain

Strain, 2010
Abstract:  Several tensile specimens with a central hole were subjected to a cyclic loading for which the Von Mises stress was beyond the initial yield stress in the vicinity of the hole. The tensile machine was fixed together with a phase‐shifting electronic speckle‐pattern interferometry measurement bench that makes it possible to perform strain ...
Farge, L., Nazarov, R., Ayadi, Z.
openaire   +1 more source

Numerical analysis of uniaxial strain ratcheting of conductive adhesives

2009 8th International Conference on Reliability, Maintainability and Safety, 2009
Under the condition of uniaxial strain(Amplitude is ±0.025%), the elastic-plastic finite element method was used to analyze the bonding of conductive/copper wire. The result shows that the plastic strain of X and Y direction is mainly occurred at two positions: one is at the left arc side; the other is at the right arc side of the Department.
Zhi Li, Xiao-yun Wu, Yun-tao Wang, Mei-rong Zhao, Min You   +4 more
openaire   +1 more source

Ratchetting strain as a driving force for fatigue crack growth

International Journal of Fatigue, 2013
Abstract Ratchetting deformation has significant implications on material damage and fatigue life of components under service loading conditions. In this work, we explore the concept of ratchetting strain as a driving force in controlling crack growth, both time-independent and time-dependent, utilising elasto-plastic, visco-plastic and crystal ...
J. Tong, L.G. Zhao, B. Lin
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Upper Bounds for Accumulated Strains Due to Creep Ratcheting

Journal of Pressure Vessel Technology, 1974
A rigorous method of bounding both the total accumulated strain and the strain ranges due to cyclic operation in the creep regime is presented. These limits can be obtained from the results of purely elastic stress analyses. The basic problem of a cylindrical vessel under internal pressure subjected to cyclic thermal stresses is solved in detail.
W. J. O’Donnell, J. Porowski
openaire   +1 more source