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3 results on '"Sharples, John"'

1. The assessment of residual stress effects on ductile tearing using continuum damage mechanics

Author

Sherry, Andrew H., Wilkes, Mark A., Sharples, John K., and Budden, Peter J.

Subjects
Residual stresses -- Measurement, Fracture mechanics -- Research, Numerical analysis -- Methods, Engineering and manufacturing industries
Abstract

This paper presents the results of a numerical study undertaken to assess the influence of residual stresses on the ductile tearing behavior of a high strength low toughness aluminum alloy. The Gurson-Tvergaard model was calibrated against conventional fracture toughness data using parameters relating to void nucleation, growth, and coalescence. The calibrated model was used to predict the load versus ductile tearing behavior of a series of full-scale and quarter-scale wide-plate tests. These center-cracked tension tests included specimens that contained a self-balancing residual stress field that was tensile in the region of the through-wall crack. Analyses of the full-scale wide-plate tests indicated that the model provides a good prediction of the load versus the ductile tearing behavior up to approximately 3 mm of stable tearing. The influence of residual stress on the load versus the crack growth behavior was accurately simulated. Predictions of the load versus the crack growth behavior of full-scale wide-plate tests for crack extensions greater than 3 mm and of the quarter-scale tests were low in terms of predicted load at a given amount of tearing. This was considered to result from (i) the 'valid' calibration range in terms of specimen thickness and crack extension, (ii) the development of shear lips, and (iii) the differences in the micromechanism of ductile void formation under plane strain and under plane stress conditions. [DOI: 10.111511.2967876] Keywords: ductile fracture, residual stresses, fracture mechanics, damage mechanics, Gurson-Tvergaard model

Published
2008

2. Offending behaviour and mental illness: characteristics of a mental health court liaison service.

Author

Sharples, John, Lewin, Terry J., Hinton, Russell J., Sly, Ketrina A., Coles, Gregory W., Johnston, Patrick J., and Carr, Vaughan J.

Subjects
Criminal justice, Administration of -- Research, Criminal behavior -- Research, Mental illness -- Research, Psychiatric services -- Research
Abstract

This paper begins with a brief review of recent literature about relationships between offending behaviour and mental illness, classifying studies by the settings within which they occurred. The establishment and [...]

Published
2003

3. Court outcomes for clients referred to a community mental health court liaison service

Author

Sly, Ketrina A., Sharples, John, Lewin, Terry J., and Bench, Christopher J.

Subjects
Community psychiatric services -- Research, Mentally ill -- Laws, regulations and rules, Punishment -- Research, Government regulation, Health, Law, Psychology and mental health
Abstract

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.ijlp.2009.01.005 Byline: Ketrina A. Sly, John Sharples, Terry J. Lewin, Christopher J. Bench Keywords: Community mental health services; Crime; Mental illness; Court decisions; Service audit Abstract: Court liaison and diversion services come in a variety of forms, but the similarities and differences between these services are not well characterized. Findings from a six-year audit of the Newcastle (Australia) Mental Health Court Liaison (MHCL) service are reported, including client characteristics, offence and service contact profiles, court outcomes, and interrelationships among these variables. During the audit period, there were 2383 service episodes by 1858 clients (1478 males, 380 females). Drug and alcohol disorders (40.9%) and psychotic disorders (17.0%) were the most prevalent mental health problems, while assault (23.1%), theft (23.1%), offences against justice procedures (15.4%), driving offences (13.4%) and malicious damage to property (8.3%) were the most frequently recorded charges. Among service episodes with a finalized court outcome, 70.0% involved a punishment (bond: 49.5%; jail term: 29.7%). Females were less likely to be punished, but more likely to have their case dismissed under sections of the relevant Act that required further assessment and monitoring. Being married, or having an adjustment or drug and alcohol disorder, were also associated with an increased likelihood of punishment, while clients with a psychotic or bipolar disorder were less likely to be punished. Among clients who were punished, those referred from inpatient mental health services were more likely to receive a non-jail punishment, while unemployed clients were more likely to be jailed. A substantial proportion of clients had court outcomes that required an ongoing involvement with local mental health services. By being part of community mental health services, our MHCL service is able to work efficiently and effectively with the criminal justice system, while facilitating ready access to existing mental health services and continuation of care. Author Affiliation: Hunter New England Mental Health and the University of Newcastle, Australia

Published
2009

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