Results 21 to 30 of about 50 (49)
A rate theory of strain relaxation
Materials Science and Engineering, 1969 Abstract Dislocation mobility studies indicate that the symmetrical form of the energy barrier and the corresponding sinh expression, usually assumed in the analysis of strain relaxation, cannot be reconciled with the results obtained in dislocation velocity measurements.
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Strain and Strain Rate: Different Preload Dependence? [PDF]
Journal of the American Society of Echocardiography, 2018 openaire +3 more sources
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Strain and strain rate echocardiography
Current Opinion in Cardiology, 2002Strain and strain rate echocardiography is an emerging technique for assessing myocardial systolic and diastolic function. It is envisioned that this modality could change the quantitative assessment of regional wall motion and improve the accuracy and reproducibility of test readings. Myocardial strain and strain rate can detect inducible ischemia and
Theodore P. Abraham +2 more
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Strain and Strain Rate Imaging in Cardiomyopathy
Echocardiography, 2009The most common indication for an echocardiogram is for the assessment of left ventricular (LV) function and, in the evaluation of cardiomyopathy (CM), this becomes even more important. However, conventional echocardiographic measures of ventricular function are insensitive at detecting subtle perturbations in contractility.
Sunil Mankad, Gillian C. Nesbitt
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Strain-rate effects for high-strain-rate computations
Journal de Physique IV (Proceedings), 2006This paper examines the effect of strain rates for computations involving high strain-rates, beyond 10 3 s -1 . Although it is generally agreed that there is an enhanced rate effect at these higher rates, there is uncertainty regarding the interpretation of dynamic test data, the form of the high-rate effect, and the effect of the high rates on ...
Charles E. Anderson +3 more
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Heart Rate Effects on Strain and Strain Rate in Healthy Children
Journal of the American Society of Echocardiography, 2005Based on myocardial Doppler echocardiography, regional strain (S) and strain rate (SR) can be evaluated as regional parameters of ventricular function. The use of these techniques in clinical pediatric cardiology remains a challenge. This study establishes reference values for S and SR in both systole and diastole in healthy children over a large age ...
Boettler, Petra +7 more
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Strain hardening rate sensitivity and strain rate sensitivity in TWIP steels
Materials Science and Engineering: A, 2015Abstract TWIP steels are materials with very high strength and exceptional strain hardening capability, parameters leading to large energy absorption before failure. However, TWIP steels also exhibit reduced (often negative) strain rate sensitivity (SRS) which limits the post-necking deformation.
Bintu, A +5 more
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Philosophical Magazine A, 1978
Abstract A method of calculating the distribution, and its time dependence, of temperature, strain rate and strain in plastically deforming metals is presented. It is assumed that the strain rate y depends on stress T and temperature T as γ = (const) Tm exp (-E/RT) where m, E and R are constants.
M. Wada, N. Kinoshita, T. Nakamura
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Abstract A method of calculating the distribution, and its time dependence, of temperature, strain rate and strain in plastically deforming metals is presented. It is assumed that the strain rate y depends on stress T and temperature T as γ = (const) Tm exp (-E/RT) where m, E and R are constants.
M. Wada, N. Kinoshita, T. Nakamura
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Strain-rate sensitivity and effects of strain rate in sheet forming
Metals Technology, 1980AbstractThe strain-rate dependencies of flow strength and strain-hardening behaviour are particularly important in sheet-forming operations because they influence strain distribution and necking resistance. Measurements made in uniaxial and biaxial tensile tests on low-carbon steels have shown that strain-rate sensitivity is a function of both strain ...
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