-
Article
Cyclic deformation behavior of high-purity titanium single crystals: Part II. Microstructure and mechanism
Strain-controlled cyclic tests have been conducted on high-purity titanium single crystals with different orientations. The fatigue mechanisms of the titanium crystals were studied by means of a scanning elect...
-
Article
Cyclic deformation behavior of high-purity titanium single crystals: Part I. Orientation dependence of stress-strain response
Randomly oriented single crystals of high-purity titanium were prepared by strain annealing and were subjected to multiple-step fatigue testing under strain-controlled conditions, in order to determine their c...
-
Article
Temporal dissipative structures in cyclically deformed metallic alloys
metallic alloys. The model employs quasi-chemical reactions of multiplication, annihilation and positive feedback among the populations of mobile, immobile, and Cottrell-type dislocations [1]. Three major typ...
-
Article
Damage and fracture of a cross woven C/SiC composite subject to compression loading
In order to understand the mechanical behaviours of ceramic matrix composites under various loading conditions, the compression stress-strain behaviour of a cross woven C/SiC ceramic matrix composite was chara...
-
Article
Atomic Force and Scanning Electron Microscopy of Corrosion and Fatigue of an Aluminum-Copper Alloy
The morphological features of 2024-T3 aluminum alloy were delineated using atomic force microscopy (AFM) during separate and combined actions of corrosion and fatigue.
-
Article
Microstructural Effects on the Cyclic Deformation of Polycrystalline FCC Materials
The effect of crystallographic texture and grain size on the cyclic hardening of FCC polycrystals was studied using copper as a model material. Samples with textures approximately random and two grain sizes we...
-
Article
Effect of ramp treatment on the cyclic response of coarse-grained copper
-
Article
Interphase behaviour in graphite-thermoplastic monofilament composites
The fatigue properties of continuous filament composites are dependent on the fibre-matrix interphase behaviour, specifically the ability of the interphase to transfer load durably from the matrix to the fibre...
-
Article
Interphase behaviour in graphite-thermoplastic monofilament composites
The role of the fibre-matrix interphase in transferring load from the matrix to the fibre in graphite-thermoplastic composites is not well understood. The goal of this work was to alter the interphase of graph...
-
Article
Interfacial studies on carbon/thermoplastic model composites using laser Raman spectroscopy
Interfacial studies were carried out on a model composite system consisting of a short carbon fibre embedded in a polycarbonate matrix. While the composite was being strained, the local strain along the fibre ...
-
Article
The mechanical behaviour of a cross-weave ceramic matrix composite
In order to find out whether or not a cross-weave ceramic composite, graphite fibre/SiC matrix, would be prone to fatigue failure, tests in pulsating tension and pulsating compression have been carried out wit...
-
Article
Mechanical behaviour of a cross-weave ceramic matrix composite
The deformation and fracture processes of a cross-weave carbon fibre/SiC composite prepared by a chemical vapour deposition process has been explored by interrupted-loading tests and SEM examination of crackin...
-
Article
The cyclic response of dilute iron alloys
In order to check whether or not a polycrystalline bcc alloy containing impurities will behave in its cyclic response like fcc material, a HSLA steel has been cycled at low strain rate in a variety of variable...
-
Article
Mechanisms of cyclic softening in precipitation-hardening alloys—A ball model approach and tests at 78 K
Tests of random, alternating cuts on a ball-model of θ″ in Al−Cu alloy have been run to check the kinetics at which disordering occurs in an initially ordered precipitate subject to cyclic strain. In addition,...
-
Article
The dislocation and martensite substructures of a fatigued, polycrystalline, pseudoelastic Cu-AI-Ni alloy
Polycrystalline Cu-AI-Ni specimens, subjected to pulsating compression fatigue, while capable of pseudo-elastic deformation, nevertheless exhibit cyclic hardening and fatigue fracture, as reported inMet. Trans. A
-
Article
The cyclic stress-strain response of polycrystalline, pseudoelastic Cu-14.5 wt pct Al-3 wt pct Ni alloy
Limited results on the fatigue of pseudo-elastic material indicate that, as a class, these materials should have truly outstanding fatigue properties. To check this, the mechanisms of cyclic deformation and fr...
-
Article
Transmission electron microscopy observations of misfit dislocations in GaAsP epitaxial films
Transmission electron microscopy observations have been made of misfit dislocation structures in GaAsP epitaxial films in foils both parallel to (1) the interface between the epitaxial film and the substrate a...
-
Article
The role of intruder dislocations in modifying the misfit dislocation structures and growth kinetics of precipitate plates
Intruder dislocations formed at θ’ and η plates in Al-4 pet Cu and Al-0.2 pct Au alloys respectively by a small plastic strain partially compensate the misfit by single arrays ; the Burgers vector of the dislo...
-
Article
High strain fatigue fracture mechanisms in two phase alloys
Cyclic response and fatigue damage have been studied on precipitation-hardened Al-4 pet Cu alloy as a function of particle type and spacing by means of scanning and transmission electron microscopy. Specimens ...
-
Article
A theory of crack nucleation in high strain fatigue
From previous observations of the surfaces of metals cycled in high strain fatigue, the mechanism of crack nucleation is considered a plastic instability phenomenon. A model for crack nucleation based on this ...
