24 Result(s)

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...

N. Gaspar, C. W. Smith, A. Alderson, J. N. Grima… in Journal of Materials Science (2011)

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...

X. J. Ren, C. W. Smith, K. E. Evans, P. J. Dooling, A. Burgess… in Experimental Mechanics (2010)

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,...

M. Bianchi, F. Scarpa, C. W. Smith, George R. Whittell in Journal of Materials Science (2010)

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...

W. Miller, C. W. Smith, D. S. Mackenzie, K. E. Evans in Journal of Materials Science (2009)

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 ...

C. W. Smith, R. J. Wootton, K. E. Evans in Experimental Mechanics (1999)

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 (...

C. T. Liu, C. W. Smith in Experimental Mechanics (1996)

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 ...

C. W. Smith in Experimental Mechanics (1993)

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...

C. W. Smith in Experimental Mechanics (1988)

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...

C. W. Smith, O. Olaosebikan in Experimental Mechanics (1986)

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...

C. W. Smith, O. Olaosebikan in Experimental Mechanics (1984)

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...

C. W. Smith in Application of Fracture Mechanics to Materials and Structures (1984)

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...

C. W. Smith, J. S. Epstein in Modelling Problems in Crack Tip Mechanics (1984)

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...

D. Post, R. Czarnek, C. W. Smith in Application of Fracture Mechanics to Mater… (1984)

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...

C. W. Smith, D. Post, G. Nicoletto in Experimental Mechanics (1983)

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...

C. W. Smith, D. Post, G. Hiatt, G. Nicoletto in Experimental Mechanics (1983)

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 ...

C. W. Smith in Fracture Mechanics Technology Applied to M… (1983)

Article

Crack-tip measurements in photoelastic models

C. W. Smith, W. H. Peters III, G. C. Kirby in Experimental Mechanics (1982)

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...

C. W. Smith, J. J. McGowan, W. H. Peters in Experimental Mechanics (1978)

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...

C. W. Smith, M. Jolles, W. H. Peters in Experimental Mechanics (1977)

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:

...

C. W. Smith, J. J. McGowan, M. Jolles in Experimental Mechanics (1976)