...A. Shekarian; A. Varvani-Farahani The present study intends to evaluate local ratcheting and stress relaxation of medium carbon steel samples under various asymmetric load levels by means of two kinematic hardening rules of Chaboche (CH) and Ahmadzadeh-Varvani (A-V). The Neuber's rule was coupled...

...Bipul Barua; Mrinal C. Saha Stress relaxation behavior of thermosetting polyurethane (PU) solid and foams were investigated in tensile mode using a dynamic mechanical analyzer (DMA). PU solid samples were manufactured in a closed mold to avoid any foam formation, whilst PU foam samples were...

...N. V. David; X.-L. Gao; J. Q. Zheng The stress relaxation behavior of a Twaron CT709 ® fabric/natural rubber composite under a uniaxial constant strain is studied using three viscoelasticity models with different levels of complexity and a newly developed para-rheological model. The three...

..., whereas the behavior of stainless steel is greatly influenced by prior loading. Mean stress relaxation in strain control and ratcheting in load control and their influence on fatigue life are discussed. Some unusual mean strain test results are presented for SS304L, where in spite of mean stress...

...M. Benedetti; V. Fontanari; B. D. Monelli The mechanism of the residual stress relaxation during the fatigue life of shot peened high-strength aluminum alloys was investigated. Experiments were conducted on specimens subjected to three different shot peening treatments and tested under reverse...

... history, the shot-peened residual stresses may change due to thermal exposure, creep, and cyclic loading. This paper describes a methodical approach for characterizing and modeling residual stress relaxation under elevated temperature loading, near and above the monotonic yield strength of nickel-base...

... 2004 01 09 2006 aluminium alloys magnesium alloys plastic flow Portevin-Le Chatelier effect strain ageing sheet materials stress relaxation polishing tensile strength nucleation Plastic flow in metals and alloys at ambient condition is originated from generation and motion...

...Dan Liu; Michael A. Hickner; Scott W. Case; John J. Lesko The stress relaxation and proton conductivity of Nafion 117 membrane (N117-H) and sulfonated poly(arylene ether sulfone) copolymer membrane with 35% sulfonation (BPSH35) in acid forms were investigated under uniaxial loading conditions...

...Fazeel Khan Experimental investigations have been performed to understand the effects of prior loading on the creep and stress relaxation behavior of an amorphous polymer (polyphenylene oxide) and a semi-crystalline polymer (high density polyethylene) at room temperature. Of particular interest...

... to the compressed mask frame and the frame is allowed to retract. Subsequently, during further processing of the cathode ray tube, the tensioned shadow mask is subjected to heating. The heating causes some of the tension to decrease due to stress relaxation phenomenon associated with heating and creep...

... of the target material on temperature. A wide spectra of cyclic mechanical and thermal loads as well as their combinations is considered and the resulting relaxed residual stress field is determined. As an application, the model was used to predict the residual stress relaxation in a high-strength steel target...

... viscoplasticity deformation entropy internal stresses stress relaxation Entropy Dissipation VBO Viscoplasticity Caratheodory Krempl , E. , and Ho , K. 2001 , “ Inelastic Compressible and Incompressible, Isotropic, Small Strain Viscoplasticity Theory Based on Overstress (VBO...

... effects. Based on experience with Hart’s model, a similar logarithmic relation Eq. ( 19 ) is applied to describe the kinetics of weak barriers. According to the analysis in this paper, this model provided a reasonable description for stress relaxation with low stress level, especially the initial...

... calibration internal stresses stress measurement finite element analysis stress analysis stress relaxation bending The hole-drilling method is the most commonly used semi-destructive method for the residual stress measurement. It involves applying a special strain gage rosette, drilling...

... manuscript received November 11, 2001. Associate Editor: D. Marquis. 17 10 2000 11 11 2001 26 03 2002 viscoplasticity work hardening dislocation motion recovery-creep plastic flow internal stresses stress relaxation alkali metal halides alloy steel...

... creep stress relaxation plasticity steel strain ageing alloy steel These state variable theories have been applied to modeling the inelastic deformation behavior of metals and alloys at ambient and at elevated temperatures. Application of the state variable theories was mostly in the regions...

... February 2000 03 November 2000 internal stresses stress measurement stress relaxation surface structure With relaxation methods, residual stresses are determined from deformations measured after material removal. Analytical complexity generally limits such techniques...

...Masayuki Tendo; Kenji Yamada; Yasumi Shimura To clarify the influence of creep deformation of stainless-steel plates on the stress relaxation at high-tension bolted connections, the measurements of creep strain and residual stress in the bolt have been made. Annealed type 304 plates showed apparent...

... internal stresses aluminium alloys cold working fatigue creep aircraft finite element analysis X-ray diffraction stress relaxation Residual Stress Cold Expansion Sachs’ Boring X-ray Creep Stress Relaxation Fastener holes in aircraft are common sites for initiation of fatigue crack...

... creep stress relaxation modelling Viscoelasticity Hereditary Behavior TIMETAL 21S Nonisothermal Deformation Multiaxial Thermodynamics A number of advanced material systems (for example metallic, polymer and ceramic based systems) are currently being researched and evaluated...