Results 151 to 160 of about 1,084 (176)
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Volume 1A: Codes and Standards, 2018
As a further extension to the structural strain method first introduced by Dong et al [1], this paper presents an enhanced structural strain method which incorporates material nonlinearity and for two typical weld structures, i.e. weldment with plate sections (e.g. gusset weld or cruciform weld etc.) and weldment with beam sections. (e.g.
Xianjun Pei +3 more
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As a further extension to the structural strain method first introduced by Dong et al [1], this paper presents an enhanced structural strain method which incorporates material nonlinearity and for two typical weld structures, i.e. weldment with plate sections (e.g. gusset weld or cruciform weld etc.) and weldment with beam sections. (e.g.
Xianjun Pei +3 more
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A strain-dependent ratchet model for [phosphate]- and [ATP]-dependent muscle contraction
Journal of Muscle Research & Cell Motility, 1998A minimal strain-dependent ratchet model of muscle cross-bridge action is proposed which is broadly compatible with structural and kinetic constraints. Its essential features are: (1) dynamic binding of the S1-products complex to actin through a disorder-order transition coupled to the release of inorganic phosphate; (2) the absence of a force ...
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Clarification of strain limits considering the ratcheting fatigue strength of 316FR steel
Nuclear Engineering and Design, 2008The effect of ratcheting on fatigue strength was investigated in order to rationalize the strain limit as a design criterion of commercialized fast reactor systems. Ratcheting fatigue tests were conducted at 550 °C. Duration of the ratchet straining was set for a certain number of strain cycles taking the loading condition of fast reactors into account,
Nobuhiro Isobe +9 more
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Studies on Onset of Ratcheting in Pipe Bends and Effect of Thickness on Strain Accumulation
Recent Advances in Solids and Structures, 2005This paper intends to provide an overview of various possibilities of ratcheting in pipelines subjected to cyclic thermal and mechanical loadings. The present work deals with review on results from the studies of research papers providing experimental data and analytical study on ratcheting.
K. Shanmuga Sundaram +2 more
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Modelling of Damage Development and Strain Ratchetting Using a Viscoplastic Constitutive Formulation
Key Engineering Materials, 2009Simulation of both damage development and strain ratchetting in uniaxial loading conditions has been presented for a nickel-based superalloy at 650°C using the unified Chaboche viscoplastic model. A third kinematic hardening component was employed to simulate strain ratchetting; and a damage variable, based on plastic strain development, was also ...
Christophe Cornet, Li Guo Zhao, Jie Tong
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Ratchetting strain as a damage parameter in controlling crack growth at elevated temperature
Engineering Fracture Mechanics, 2009Progressive increase in tensile strains near a crack tip has been observed from finite element studies of stationary and growing cracks (Zhao, 2004, 2008) [1,2] under cyclic loading conditions. In this work, the significance of such a phenomenon was further explored. In particular, stress-controlled experiments were carried out to evaluate the uniaxial
Cornet, Christophe +2 more
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Volume 3: Design and Analysis, 2014
The influence of mean strain on fatigue life was investigated for Type 316 stainless steel at room temperature in ambient environment. Two types of mean strain were simulated in the fatigue tests: constant and increasing (ratcheting) mean strains. In order to apply the constant mean strain, prestraining was induced prior to fatigue tests.
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The influence of mean strain on fatigue life was investigated for Type 316 stainless steel at room temperature in ambient environment. Two types of mean strain were simulated in the fatigue tests: constant and increasing (ratcheting) mean strains. In order to apply the constant mean strain, prestraining was induced prior to fatigue tests.
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2018
Uniaxial ratcheting behavior of Z2CND18.12N austenitic stainless steel used nuclear power plant piping material was studied. The results indicated that ratcheting strain increased with increasing of stress amplitude under the same mean stress and different stress amplitude, ratcheting strain increased with increasing of mean stress under the same ...
Chen, Xiaohui, Chen, Xu, Chen, Haofeng
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Uniaxial ratcheting behavior of Z2CND18.12N austenitic stainless steel used nuclear power plant piping material was studied. The results indicated that ratcheting strain increased with increasing of stress amplitude under the same mean stress and different stress amplitude, ratcheting strain increased with increasing of mean stress under the same ...
Chen, Xiaohui, Chen, Xu, Chen, Haofeng
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In-situ observation of strain evolution and ratchetting of growing fatigue cracks
Engineering Fracture Mechanics, 2023Rong Chen +3 more
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An Experimental Study of Progressive Strain Growth Due to Thermal-Stress Ratcheting
Journal of Engineering Materials and Technology, 1978A special plate-shaped specimen with two symmetrical, straight air gaps in the center portion and a pair of holes for load chucks at the end portion is used for thermal-stress ratcheting experiments. Experimental results on strain growth due to thermal-stress ratcheting are presented for specimens made of types 304 and 316 austenitic stainless steel ...
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