Results 311 to 320 of about 2,251,793 (347)
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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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Aspects of strain measures and strain rates
Acta Mechanica, 1986In finite homogeneous deformation processes, the principal triad generally rotates with respect to a material element during the deformation. The material derivative of the logarithmic strain is no longer simply related to the rate of deformation tensor, and this is exemplified herein.
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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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2009
The tensor analysis providing the mathematical foundation for the continuum mechanics is described in Chapter 1. Basic concepts and quantities for continuum mechanics will be studied in the three chapters up to Chapter 4. The description of motion and deformation of a material body constitutes the basic introductory part of the continuum mechanics ...
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The tensor analysis providing the mathematical foundation for the continuum mechanics is described in Chapter 1. Basic concepts and quantities for continuum mechanics will be studied in the three chapters up to Chapter 4. The description of motion and deformation of a material body constitutes the basic introductory part of the continuum mechanics ...
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Strain rate and strain rate history effects on the dynamic behavior of metallic materials
International Journal of Solids and Structures, 1980Abstract The constitutive equations for strain hardening (f.c.c. metals and alloys) and strain softening-hardening metallic materials (b.c.c. metals and alloys) have been developed. The development is within the framework of the endochronic theory of viscoplasticity. In this discussion, the intrinsic time is dependent on the plastic strain rate. The
Han C. Wu, M.C. Yip
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Strain-Rate Selection in the Constant-Rate-of-Strain Consolidation Test
1981Constant-rate-of-strain (CRS) consolidation tests were performed on remolded kaolinite specimens. The effect of strain rate on CRS test data is shown. A relation between soil parameters and strain rate was developed and used to formulate a strain-rate selection procedure.
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