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Strain rate sensitivity of toughened epoxy
Iranian Polymer Journal, 2015The 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 +4 more
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Strain rate sensitivity of hydroxyapatite coatings
Thin Solid Films, 2011Abstract The strain-rate sensitivity of strength is a significant factor to evaluate the deformation mode of crystalline materials. The strain rate sensitivity of hardness is experimentally investigated here for hydroxyapatite coatings that are sputter deposited onto titanium-coated silicon wafers. These biocompatible HA coatings can provide a strong,
H.S. Tanvir Ahmed, Alan F. Jankowski
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Strain-rate sensitivity index of thermoplastics
Journal of Materials Science, 1993Strain-rate sensitivity index, m, values of several thermoplastics (HDPE, PP, PMMA, PS, PVC, PC, and PA) were determined at ambient temperature by both variable strain-rate and stressrelaxation methods. Specimens were loaded in tension in the elastic portion of the stress-strain curve at various strain rates and the load was recorded as a function of ...
D. L. Goble, E. G. Wolff
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On serrated yielding and negative on strain-rate sensitivity
The Chemical Engineering Journal, 1966Abstract 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 a high strain rate superplastic TiNp/2014 Al composite
Journal of Materials Processing Technology, 2010Abstract The effects of deformation temperature and strain in hot rolling deformation on strain rate sensitivity of the TiN p /2014 Al composite were studied by tensile tests conducted out at 773, 798, 818 and 838 K with the strain rates from 1.7 ×10 −3 to 1.7 × 10 0 s −1 .
H.E. Hu, L. Zhen, T. Imai
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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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Strain-rate sensitivity of ultrafine-grained materials
Zeitschrift für Metallkunde, 2005Abstract The strain-rate sensitivity of commercial purity Aluminium (Al 99.5) and of α-iron, with both conventional (CG) and ultrafine (UFG) grain sizes, are investigated by compression and tension tests at different temperatures. Microstructural investigations were performed before and after compression testing in order to investigate the ...
Höppel, H. +3 more
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CONSTITUTIVE MODELLING OF STRAIN RATE SENSITIVITY
1993Conventional treatment of strain rate sensitivity measurements from strain change tests involving graphical method is examined. The resultant strain rate sensitivity was found to depend strongly on the magnitude of the change in crosshead velocity. Furthermore, the graphical method is unable to account for the instantaneous strain rate sensitivity ...
C.P. Ling, P.G. McCormick
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Strain-rate sensitive tough fibre-reinforced composites
Journal of Materials Science, 1977A new type of composite was designed and tested which has greater fracture toughness under impact loading conditions than conventional fibre-reinforced composites. This composite is strain-rate sensitive and can be more than twice as tough as conventional composites having the same matrix and fibre.
Nak-Ho Sung +2 more
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Strain-rate sensitivity of glasses
2017Although glasses are commonly thought of as ideal brittle materials, a local plastic deformation can be induced by the penetration of sharp objects, such as the indenter tips commonly employed for hardness testing. Since the first experimental verification of this phenomenon, considerable research effort has been devoted to the underlying microscopic ...
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