Results 201 to 210 of about 6,850 (263)

Ductile–brittle transition in polymers

Journal of Applied Polymer Science, 1984
Tensile experiments on polypropylene and various rubber-modified polypropylenes, conducted over a wide range of temperatures and strain rates, have shown that the ductile–brittle transition in these highly crystalline polymers is strongly affected by both temperature and strain rate.
B. Z. Jang, D. R. Uhlmann, J. B. Vander Sande   +2 more
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Ductile-brittle transition in random porous Au

Physical Review Letters, 1992
We report experimental results describing the mechanical breakdown of random porous Au which is a new material specifically developed for this study. Digital image analysis was used to characterize the microstructures of the samples which varied by more than 2 orders of magnitude in length scale.
, Li, , Sieradzki
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Ductile-Brittle Transition

2012
For many materials impact tests display a ductile-brittle transition when temperature is lowered. Analyses of the limit moment of notched test pieces and of the stress distribution are given, especially for the Charpy specimen. Testing procedure including instrumented impact testing are described.
Dominique François, André Pineau, André Zaoui   +2 more
openaire   +1 more source

Aspects of the ductile-brittle transition in fatigue

Journal of Materials Science Letters, 1990
We propose that the fatigue lifetime inversion observed in polycarbonate (PC) could be described as a ductile-brittle transition. Such a proposition implies there might be a link between the inversion observed in many polymers for various mechanical ...
R. Boukhili, R. Gauvin
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The ductile-brittle transition in polycrystalline molybdenum

Acta Metallurgica, 1969
Abstract The fracture stress at the ductile-brittle transition temperature of polycrystalline molybdenum was found to be constant, 64± 2 kg mm−2, as the strain rate was raised from 5 × 10−6to 5 × 10−2sec−1. It is suggested that only above the transition temperature is crack nucleation easier than crack propagation and that brittle fracture takes ...
A.S Wronski, A.C Chilton, E.M Capron
openaire   +1 more source

Ductile-brittle fracture transitions in polycarbonate

International Journal of Fracture, 1975
Test data is described for polycarbonate single edge notch specimens at a range of loading rates and two thicknesses at 20°C. The transition from ductile to brittle failure is shown to be both rate and thickness dependent. The effects may be described in terms of a plane stress and a plane strain fracture toughness coupled with a rate dependent yield ...
M. Parvin, J. G. Williams
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Ductile-brittle transition in alpha brass

Acta Metallurgica, 1960
Abstract It is demonstrated that embrittlement of alpha brass by liquid mercury is temperature dependent and that the functional relationship is a transition from ductile to brittle behavior in the same manner as experienced by iron and other body-centered cubic metals tested in their normal recrystallized state.
H Nichols, W Rostoker
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The ductile-brittle transition in a polyethylene copolymer

Journal of Materials Science, 1990
The ductile-brittle transition of an ethylene-hexene copolymer was measured from 80 to 24° C. The basic curves of stress against time to failure could all be unified in terms of a single equation based on normalizing the stress relative to the transition stress between the ductile and brittle regions and using a single thermal activation parameter ...
Xici Lu, Norman Brown
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The ductile-brittle transition in ionic solids

Philosophical Magazine, 1959
Abstract Polished monocrystals of silver chloride, sodium chloridc, lithium fluorido and magnesium oxide have been shown to exhibit ductility transitions when loaded by impact bending. The behaviour of silver chloride stood apart from that of the other solids in that the temperature below which it cleaved without macroscopic deformation was less than 0.
T. L. Johnston, R. J. Stokes, C. H. Li
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Evaluation of Ductile/Brittle Failure Theory and Derivation of the Ductile/Brittle Transition Temperature

Journal of Applied Mechanics, 2015
A recently developed ductile/brittle theory of materials failure is evaluated. The failure theory applies to all homogeneous and isotropic materials. The determination of the ductile/brittle transition is an integral and essential part of the failure theory.
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