Results 261 to 270 of about 86,765,181 (295)

The brittle-to-ductile transition in cold rolled tungsten: On the decrease of the brittle-to-ductile transition by 600 K to − 65 °C

International Journal of Refractory Metals and Hard Materials, 2018
Abstract This paper attempts to elucidate fundamental mechanisms of the brittle-to-ductile transition (BDT) in textured, pre-deformed, polycrystalline body-centred cubic metals. For this purpose, five tungsten sheets have been rolled out from one and the same sintered ingot representing degrees of deformation of 1.8, 2.5, 3.0, 3.4, and 4.1 ...
Bonnekoh, Carsten, Hoffmann, Andreas, Reiser, Jens   +2 more
openaire   +2 more sources

The brittle to ductile transition in a soda–lime–silica glass

Journal of Non-Crystalline Solids, 2000
The brittle to ductile transition (EDT) occurring in a standard window glass around T-g has been studied both theoretically and experimentally by introducing artificial cracks in glass specimens tested in bending at different temperatures with different displacement rates.
Rouxel, Tanguy, Sangleboeuf, Jean-Christophe   +1 more
openaire   +1 more source

Brittle-to-Ductile Transition in Silicon Nitride

1992
Since silicon nitride is hard to sinter, it is general to sinter with small amounts of sintering aids, such as Al2O3 and Y2O3. Therefore, very thin glass phase formed at the grain boundary has an influence on high temperature mechanical properties of sintered silicon nitride.
Y. Mutoh, K. Yamaishi, N. Miyahara, T. Oikawa   +3 more
openaire   +1 more source

Brittle-to-ductile transition in steels and the critical transition temperature

International Journal of Fracture, 1983
Specimens of different thickness made of a low-alloy steel were tested to determine fracture toughness under static and impact loading at room and low temperatures. It was found that for the specimen of each thickness there was a specific brittle-to-ductile transition temperature Tps defined as the upper temperature boundary up to which plane-strain ...
A. J. Krasowsky, Yu. A. Kashtalyan, V. N. Krasiko   +2 more
openaire   +1 more source

Effects of water on the brittle to ductile transition of sandstones

2023
Geothermal energy is one of the renewable energy sources that can help mitigate climate change. Rocks are elasto-plastic materials at low pressure and temperature, and the deformation is accommodated along localized shear bands (brittle behavior); at high pressure and temperature rocks are elasto-visco-plastic and the deformation is homogeneous ...
Francesco Lazari, Marie Violay, Florence Begue   +2 more
openaire   +1 more source

A brittle to ductile transition in ice under tension

Philosophical Magazine A, 1984
Abstract Experiments have revealed a brittle to less-brittle transition in polycrystalline ice Ih slowly strained (10−6 s1) under uniaxial tension at temperatures from −20°C to −5°C. The transition occurs at a ‘critical grain size’ (≃ 1–5 mm) where the stress to nucleate cracks equals the stress to propagate them.
E. M. Schulson, P. N. Lim, R. W. Lee
openaire   +1 more source

The Brittle to Ductile Transition In MgAl2O4 Spinel

1995
The brittle to ductile transition in ceramic materials is often referred to as the ductile to brittle transition in the metallurgical literature.1–4 It has been a topic of interest in crystalline ceramics for nearly half a century, since the early efforts to develop “ductile” ceramics in the 1950’s. Although there have been efforts to address the topic
Ronald L. Stewart, Richard C. Bradt
openaire   +1 more source

Size scale effects on brittle to ductile transition

Le Journal de Physique IV, 1998
In the present paper the influence of a specific microstructural feature on the brittle to ductile behaviour of semi-brittle materials is emphasised. The dislocation free zone size (formerly introduced to account for the behaviour of these materials) for which incomplete crack tip shielding is expected, is a function of the dislocation sources activity.
G. Michot, M.A. Loyola de Oliveira, H. Koizumi   +2 more
openaire   +1 more source

Spontaneous brittle-to-ductile transition in aqueous foam

Journal of Rheology, 2012
A single layer of foam bubbles between parallel plates fails (fractures) when subjected to an applied pressure. The fracture can occur in both a ductile mode and a brittle mode. It is shown that dissipative effects during propagation of a brittle crack lead to a spontaneous brittle-to-ductile transition, which occurs dynamically during fracture and can
Shehla Arif, Jih-Chiang Tsai, Sascha Hilgenfeldt   +2 more
openaire   +1 more source

Cooperative Dislocation Generation And The Brittle-To-Ductile Transition

MRS Proceedings, 1995
AbstractThe characteristic features of the brittle-to-ductile transition are explained using a model of cooperative dislocation generation. In two dimensions, the onset of the ductile behavior corresponds to a thermally-driven, stress-assisted dissociation of many atomic-size dislocation dipoles in the vicinity of the crack tip above a critical ...
M. Khantha, D. P. Pope, V. Vitek
openaire   +1 more source