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2 edition of failure of brittle materials under superposed hydrostatic pressure found in the catalog.

failure of brittle materials under superposed hydrostatic pressure

Robert James Howard

failure of brittle materials under superposed hydrostatic pressure

a comparison with experimental data of failure criteria under complex loading for silicon carbide, alumina, magnesia, and carbon fibre reinforced nickel composite.

by Robert James Howard

  • 330 Want to read
  • 8 Currently reading

Published in Bradford .
Written in English


Edition Notes

Ph.D. thesis. Typescript.

SeriesTheses
The Physical Object
Pagination111p., [25] Leaves of plates
Number of Pages111
ID Numbers
Open LibraryOL13787822M

Young’s modulus for no superposed hydrostatic pressure. 2 E i failure in terms of residual materials properties. failure: yielding and brittle fracture. For certain stress states. First of all we have to examine definition of material failure itself. I think the material failure under compression means likely separation of its grains in case the hydrostatic state of stress.

Prof. Sengupta MET Theories of failure 4/9 materials. Examples of brittle materials are cast iron, concrete, cast glass etc. Suc and Sut values of different classes of Cast Iron’s can be found in Chapter 14 of the textbook. 3. Engineering stress and problem of predicting failure. Unidirectional fiber-reinforced composites are often observed to fail in a longitudinal splitting mode in the fiber direction under far-field compressive loading with weak lateral confinement. An energy-based model is developed based on the principle of minimum potential energy and the evaluation of effective properties to obtain an analytical Cited by:

Let us assume that there is a microcrack in a brittle material, let's say a ceramic. When a tensile load is applied, the crack propagates immediately because the crack- tip plastic zone in such a material is too small. However, if a compressive lo. nevertheles., the nickel matrix was ductile, in contrast to the material of Braiick et s1. 'Tests under superposed hydrostatic pressures indicate the critical staUge in the failure process to be the tensile failure of the fibres, in contrast to the shear-operated failu-e mechanism in the resin composite.* : B R Watson-Adams, J J Dibb, A S Wronski.


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Failure of brittle materials under superposed hydrostatic pressure by Robert James Howard Download PDF EPUB FB2

The failure of brittle materials under superposed hydrostatic pressure Author: Howard, R. Failure Analysis of Brittle Materials: Advances in Ceramics [Frechette, V. D.] on *FREE* shipping on qualifying offers. Failure Analysis of Brittle Materials: Advances in CeramicsPrice: $   An arrangement is described permitting the fracture of brittle materials under the action of tensile stress superposed on hydrostatic pressure.

The hydrostatic pressures Cited by:   An arrangement is described permitting the fracture of brittle materials under the action of tensile stress superposed on hydrostatic pressure.

The hydrostatic pressures range up to 30, kg/cm 2. The tensile stress superposed on the pressure required to break Pyrex glass is a strong function of the material by which pressure is transmitted to the lateral surface of the glass, but in all Cited by: The 64 S.

AOKI, Y. SATO and H. ISAIKAWA behaviours of the specimen under such conditions might then provide indications concerning the properties of brittle materials under very high hydrostatic pressure. This is the reason chalk was chosen as the test material in this study. EXPERIMENTAL METHODS Specimens as shown in Figs.

I (a) and (b) were by: 2. The failure of two grades of polyethylene has been studied using the technique of torsion under superposed hydrostatic pressure.

Failure of brittle materials under superposed hydrostatic pressure book behaviour of unnotched samples of both grades was ductile at all pressures and by:   Yield and fracture of polyethylene have been studied in torsion tests under superposed hydrostatic pressures.

Two ductile-to-brittle transitions have been At high strain rates and pressures, a conventional ductile-to-brittle transition was found with increasing strain rate and by: Compressive tests were performed on fine and coarse-grained granular ice with grain size of 1 and 10 mm and coarse-grained columnar ice at strain rates from 3 × to 5 × s-1 under hydrostatic confining pressure from to 50 MPa, at −11 ± °C.

The effect of hydrostatic confining pressure on the failure mode and the compressive strength were examined with reference to grain Cited by: 7. The failure of two grades of polyethylene has been studied using the technique of torsion under superposed hydrostatic pressure.

The behaviour of unnotched samples of both grades was ductile at all pressures and strain-rates. However, at sufficiently high pressures both grades of polyethylene (including a tough copolymer) failed in a brittle manner when a surface notch was Cited by: Mohr's theory is often used in predicting the failure of brittle materials, and is applied to cases of 2D stress.

Mohr's theory suggests that failure occurs when Mohr's Circle at a point in the body exceeds the envelope created by the two Mohr's circles for uniaxial tensile strength and uniaxial compression strength.

Scanning electron micrograph of the failure surface of a cast molybdenum specimen which failed by ductile void coalescence and fibrous rupture at K.

under a superposed pressure of M Mm'2. The nominal tensile failure strain was 56%.Cited by: 7. Tension tests to fracture under superposed hydrostatic pressure reaching to nearly 30 kg/cm 2 have been conducted on five polycrystalline metals, Ni, Ta, Cb, Mo, and W, two brittle single metallic crystals, Sb and Cu 5 Zn 8, and two brittle amorphous materials, ``Melmac '' and B 2 O 3 by: In effect, brittle failure under a superimposed hydrostatic pressure initiated at the specimen surface (because of sensitivity to surface conditions) could not be represented in terms of a single stress criterion; Bridgman did not attempt to derive an energy criterion.~6 For polymers, Duckett1 ~ proposed a theory involving pressurizing fluid penetration of surface cracks to account for extensile failure in a Cited by: The high pressure testing apparatus capable of testing materials in tension or compression under the influence of superposed pressure at levels up to 1 GPa is described elsewhere ().

Testing under superposed pressure has been successful in significantly extending the ductility of nominally brittle materials. Atmospheric strengths were in the range – MPa, and all materials showed a strong, about 3, pressure-dependence. Kinking of fibre bundles or sub-bundles preceded fracture in all materials at all pressures, but failure to detect non-propagating transverse cracks, which allow such groups of fibres to act in unison, indicates that bundle-debonding controlled the critical mechanism of by:   Brandes, M.: “Technique of Testing the Strength of Materials Under High Hydrostatic Pressure,” (in Polish).

Prace Instytutu Mechaniki Precyzjnej, 10 (4), 1–22 (). English translation, NELEast Kilbride, Glasgow, National Engineering by: 6. Theories of Failure Distortion-Energy Theory OR The von Mises - Hencky Theory It has been observed that a solid under hydro-static, external pressure (e.g.

volume element subjected to three equal normal stresses) can withstand very large stresses. When there is File Size: KB. with superimposed hydrostatic pressure, with a good agreement between the model and the experiments for both variables.

The influence of the transverse stress on the shear response, as predicted by the model, is shown in Fig. 12, presenting good agreement with typical experimental data. The shear response under superposed hydrostatic. Analysis of brittle fracture of soda glass bottles under hydrostatic pressure Article in Journal of Failure Analysis and Prevention 4(5) January with 48 Reads How we measure 'reads'.

of my pressure apparatus. With the accumulation of material, however, and in particular with the discovery of the enormous effect of hydrostatic pressure in increasing ductility and in extending the domain of strain-hardening in steel, my interest grew in the subject for its own sake.

Compression loadings in thick composites can in some cases lead to three-dimensional states of stress with a compressive mean stress.

A model is developed in the present work that attempts to incorporate this compressive mean stress into a prediction for compression strength of Cited by: 2.Relative to failure, all materials can behave either in a ductile or a brittle manner depending upon the state of stress that they are under and other environmental influences.

The two terms, yielding and failure, have imprecise definitions that usually allow a wide latitude of by: R.H. Sigley's 4 research works with 47 citations and reads, including: Axial compressive failure of glass-fibre polyester composites under superposed hydrostatic pressure: influence of fibre.