Results 301 to 310 of about 2,821,004 (350)
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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 Rates and Material Spins
Journal of Elasticity, 1998This work presents a thorough discussion concerning the definition and properties of various material time rates of Lagrangian strain measures, objective corotational rates of Eulerian strain measures, and related spin tensors needed in the formulation of sophisticated constitutive equations of continuum physics (anelasticity, rheological laws ...
Xiao, Heng +2 more
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Strain, Strain Rate, Torsion, and Twist: Echocardiographic Evaluation
Current Cardiology Reports, 2015Deformation imaging by tissue Doppler imaging (TDI) and speckle-tracking echocardiography (STE) are emerging clinical methods. TDI- and STE-derived parameters, such as myocardial strain and strain rate, as well as torsion and twist, provide detailed information about myocardial function and are associated with cardiovascular morbidity and mortality ...
Anders, Opdahl +3 more
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Echocardiographic strain and strain rate imaging — Clinical applications
International Journal of Cardiology, 2009Echocardiographic strain and strain rate imaging is a new technology enabling more reliable and comprehensive assessment of myocardial function. The spectrum of potential clinical applications is very wide due to its ability to differentiate between active and passive movement of myocardial segments, to quantify intraventricular dyssynchrony and to ...
Michael, Dandel, Roland, Hetzer
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High-rate decremental-strain-rate test
Experimental Mechanics, 1988A modified torsional split-Hopkinson bar is intoduced and used to study material response associated with a sudden reduction of stain rate during high-rate plastic deformation. In tests on 1100-0 aluminum iniial deformation at a strain rate of approximately 2400 s−1 is reduced by a factor of 15 after 200 μs of high-rate deformation. After the reduction,
A. Gilat, Y. H. Pao
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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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1999
The mechanical properties of most materials vary with the rate of loading and this effect is particularly evident in polymers. It is usual when considering rate of loading effects in a material, rather than a structure, to quantify the loading rate in terms of a strain rate where the strain rate can conveniently be visualised as the number of times a ...
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The mechanical properties of most materials vary with the rate of loading and this effect is particularly evident in polymers. It is usual when considering rate of loading effects in a material, rather than a structure, to quantify the loading rate in terms of a strain rate where the strain rate can conveniently be visualised as the number of times a ...
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Strain Hardening and ‘Strain-Rate Hardening’
1982The limitations of power-law strain hardening and ‘strain-rate hardening’ descriptions are reviewed. It is found that significant advantages can be gained by using, instead, the Voce relation, especially in the proposed modification that accounts for the rate sensitivities of flow stress and of strain hardening.
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Strain Rate and Strain Rate History Effects in Two Mild Steels.
1979Abstract : Results are presented of a series of experiments performed with two steels to investigate the dependence of flow stress on strain rate and its history. For this purpose quasi-static, dynamic and incremental strain rate tests were conducted on SAE 1020 hot-rolled steel and SAE 1018 cold-rolled steel at room temperature. It is shown that while
J. Duffy, R. H. Hawley, M. L. Wilson
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