Results 231 to 240 of about 512,239 (311)

On serrated yielding and negative on strain-rate sensitivity

The Chemical Engineering Journal, 1966
Abstract Negative strain-rate sensitivity is shown to be a common feature in a variety of materials provided test conditions are chosen such that serrated yielding (the Portevin-Le Chatelier effect) occurs. An instability is shown to exist in the dislocation velocity ( v )- stress (τ) relation, which leads to negative values of ∂ log τ ∂
B.A. Wilcox, A.R. Rosenfield
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Strain rate sensitivity of flow stress at large strains

Acta Materialia, 1998
Measurements of the strain rate sensitivity of flow stress are critically assessed. Results depend on strain and on the range of strain rates employed. Changes in strain hardening and transients in the flow stress are discussed.
H.P. Stüwe, P. Les
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Microstructure, strain-rate sensitivity, work hardening, and fracture behavior of laser additive manufactured austenitic and martensitic stainless steel structures

Materials Science & Engineering: A, 2019
The tensile flow properties of austenitic (S316-L) and martensitic (S410-L) stainless steel wall structures deposited by powder-fed laser additive manufacturing (LAM) process are evaluated.
F. Khodabakhshi, M. H. Farshidianfar, A. Gerlich, M. Nosko, V. Trembošová, A. Khajepour   +5 more
semanticscholar   +1 more source

Identifying the origin of strain rate sensitivity in a high entropy bulk metallic glass

Scripta Materialia, 2019
A series of nanoindentation tests were performed on a high entropy bulk metallic glass (HE-BMG). At low peak-loads, high positive strain rate sensitivity was found.
Qing Zhou, Yin Du, Weichao Han, Yue Ren, H. Zhai, Haifeng Wang   +5 more
semanticscholar   +1 more source

Eutectic phase strengthening and strain rate sensitivity behavior of AZ80 magnesium alloy

, 2020
A Mg–8Al-0.5Zn-0.2Mn wt.% (AZ80) alloy, containing a high volume percent of the β eutectic phase, was prepared using extrusion without a homogenization pretreatment (EX-II(F)).
Lingbao Ren, Mingyang Zhou, Tianhui Lu, Lingling Fan, Yangyang Guo, Yuwenxi Zhang, C. Boehlert, G. Quan   +7 more
semanticscholar   +1 more source

Strain-rate sensitivity and effects of strain rate in sheet forming

Metals Technology, 1980
AbstractThe 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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Strain Rate Sensitivity of Automotive Steels

SAE Technical Paper Series, 1992
<div class="htmlview paragraph">Strain rate sensitivity is an important material property in the formability of sheet metal. In this study, strain rate sensitivity is evaluated for several different grades of steel. Strain rate sensitivity varies from 0.01 to 0.022 for the steels tested.
Ming F. Shi, David J. Meuleman
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Anneal hardening and elevated temperature strain rate sensitivity of nanostructured metals: Their relation to intergranular dislocation accommodation

Acta Materialia, 2019
Nanocrystalline materials exhibit various properties or phenomena not common in the conventional grain size regime, including enhanced strain rate sensitivity for FCC metals or strength increase during recovery annealing.
O. Renk, V. Maier-Kiener, I. Issa, Jun Li, D. Kiener, R. Pippan   +5 more
semanticscholar   +1 more source

Strain Rate Sensitivity of Flow Stress at Very High Rates of Strain

1996
In order to clarify the mechanism of the steep rise in the flow stress, widely seen in metallic materials at strain rates above about 5×103/sec, two strain rate change tests were conducted. The strain rate reduction test was made for polycrystalline aluminium, copper, iron and niobium at strain rates up to about 2×104/sec.
J. Shioiri, K. Sakino, S. Santoh
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Strain rate sensitivity of toughened epoxy

Iranian Polymer Journal, 2015
The high strain rate behaviour of toughened epoxy is explored under compressive loadings. A cycloaliphatic epoxy was toughened using different types of preformed fillers: epoxy-coated elastomeric poly(dimethylsiloxane) (CSR) and thermoplastic polystyrene microspheres.
Saurabh Chaudhary, Nahid Iqbal, Vikas Mangla, Devendra Kumar, Prasun Kumar Roy   +4 more
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