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Article
A generalised three-dimensional tethered-nodule model for auxetic materials
Models for the nano/micro-structural deformation and mechanical properties of auxetic materials (i.e. materials with a negative Poisson’s ratio) have been previously developed. However, most of these models ha...
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Article
Elastic Deformation of Materials under Distributed Shear Loading
In this work, the deformation of material under localised tangential loading has been investigated. An analytical expression to predict deformation and strain patterns under tangential loading over a rectangul...
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Article
Physical and thermal effects on the shape memory behaviour of auxetic open cell foams
This study examines the processing envelope related to auxetic open cell foams and their shape memory properties, with the analysis of four different phases of multi-component foams (conventional, 1st auxetic,...
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Article
Negative thermal expansion: a review
Most materials demonstrate an expansion upon heating, however a few are known to contract, i.e. exhibit a negative coefficient of thermal expansivity (NTE). This naturally occurring phenomenon has been shown t...
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Article
Interpretation of experimental data for Poisson's ratio of highly nonlinear materials
The Poisson's ratio of a material is strictly defined only for small strain linear elastic behavior. In practice, engineering strains are often used to calculate Poisson's ratio in place of the mathematically ...
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Article
Temperature and rate effects on stable crack growth in a particulate composite material
In this study, edge cracked sheet specimens made from polybutadiene rubber embedded with hard particles were used in crack propagation tests. Crack propagation tests were conducted under two crosshead speeds (...
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Article
Experiments in three-dimensional fracture problems
Using the established optical methods of frozen stress photoelasticity and moiré interferometry, the author and his colleagues, by introducing some standard refinements, demonstrate how useful information has ...
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Article
Analytical and experimental studies of the surface flaw
This paper uses the Newman-Raju model, the Paris crack-growth-rate law and a fixedR ratio to demonstrate the analytical considerations associated with predicting stress-intensity distributions and fatigue crack g...
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Article
On the extraction of stress-intensity factors from near-tip photoelastic data
Existing algorithms and a new algorithm called ‘quadratic’, for extracting stress-intensity factors (SIF) from frozen-stress photoelastic data are evaluated for application to near-tip data in three-dimensiona...
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Article
Use of mixed-mode stress-intensity algorithms for photoelastic data
A generalization of irwin's method and a new algorithm, called ‘quadratic,’ are proposed for the extraction of mixed-mode stress-intensity factors (SIF) in three-dimensional cracked-body problems. These new al...
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Chapter and Conference Paper
Stress Intensity Factor Distributions by Optical Methods
An integrated optical method consisting of the combined use of frozen stress photoelasticity and Moiré interferometry for measuring stress intensity distributions and crack shapes in three dimensional problems...
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Chapter and Conference Paper
Measurements of Near Tip Field Near the Right Angle Intersection of Straight Front Cracks
One of the most difficult and controversial areas of research in analytical fracture mechanics has been the evaluation of the distribution of stress intensification as a crack approaches a free boundary [1,2,3...
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Chapter and Conference Paper
Patterns of U and V Displacements Around Cracks in Aluminum by Moire Interferometry
In-plane displacement fields around fatigue cracks in aluminum alloys 7075-T6 and 6061-T6 are revealed by high-sensitivity moire interferometry. Excellent patterns, with sensitivity corresponding to moire with...
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Article
Experimental stress-intensity distributions in three-dimensional cracked-body problems
For over a decade, the first author and his associates have worked towards the development of an optical-experimental-modeling technique for predicting both the flaw shape and the stress-intensity-factor distr...
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Article
Displacement measurements around cracks in three-dimensional problems by a hybrid experimental technique
Diffraction gratings were applied to slices taken from three-dimensional stress-frozen models of bodies with cracks. The slices were then annealed to relax the reversible strains and moiré interferometry was u...
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Chapter and Conference Paper
Modelling of Sub-Critical Flaw Growth in Three Dimensional Crack Problems
The most frequent chronology of events leading to service fractures in metal parts begins with a defect or tiny flaw, usually on an exposed surface near a re-entrant corner, which enlarges under the action of ...
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Article
Crack-tip measurements in photoelastic models
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Article
A study of crack-tip nonlinearities in frozen-stress fields
A mechanical and optical characterization study in a uniaxial field was conducted on a commercial di-phase photoelastic material suitable for stress freezing. Results were used in a plane-strain theory for pre...
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Article
Stress intensities for nozzle cracks in reactor vessels
A series of six frozen stress photoelastic tests was conducted to investigate the distribution of stress-intensity factor (SIF) along a crack which occurred at the juncture of a pipe (nozzle) with a cylindrica...
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Article
Effects of artificial cracks and poisson's ratio upon photoelastic stress-intensity determination
A series of stress-freezing photoelastic experiments were performed with multiple replications upon edge-cracked strips for three types of “cracks” in current use:
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