Browsing by Author "Gryzagoridis, J"

Now showing 1 - 6 of 6
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    Comparing infrared thermography and ESPI for NDE of aircraft composites
    (2010) Findeis, D; Gryzagoridis, J; Lombe, C
    Infrared thermography is gaining acceptance by industry as a suitable non-destructive testing and evaluation (NDT/E) technique. Likewise, electronic speckle pattern interferometry (ESPI) has also been shown to be suited for similar purposes, particularly for the inspection of composite materials. This paper presents the theory of the two inspection methods. Selected composite samples containing defects are subjected to identical inspection procedures using both techniques. The results are presented and compared with each other. From the results it is clear that both techniques are suited for the detection of the defects in the composite sample. The results also indicate that ESPI is a more sensitive inspection technique than IRT. Comparisons are drawn and the benefits of each technique discussed.
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    Impact damage detection on composites using optical NDT techniques
    (2010) Gryzagoridis, J; Findeis, D
    The paper presents the work that was carried out in the detection and, beyond of what is obviously visible to the naked eye, the extent of impact damage inflicted on composite panels designed and manufactured for structural applications in the aerospace industry. Using a drop-weight impact tester, the composite specimens were subjected to controlled impact conditions, ie relatively low velocity impact levels analogous to those expected from the drop of a heavy tool, collision with a bird etc. The composite specimens consisted of Monex core sandwiched between thin carbon/glass fibre reinforced plastic skins, typically identical to those used in the fabrication of unmanned air vehicles and helicopter rotor blades. The investigation attempted to establish the probability of detecting such barely visible impact damage with optical non-destructive testing methods such as digital shearography, electronic speckle pattern interferometry and infrared thermography. These NDT techniques were chosen to be employed in this study because they are non-contacting, whole-field, not limited to particular material types, provide fast and easy results in real time and have been proven reliable in a large number of applications in the laboratory/factory/field environment.
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    Monitoring structural integrity using fibre optic sensors
    (2007) Gryzagoridis, J; Utou, F; Sun, B
    The International Society for Burns Injuries (ISBI) has published guidelines for the management of multiple or mass burns casualties, and recommends that 'each country has or should have a disaster planning system that addresses its own particular needs.' The need for a national burns disaster plan integrated with national and provincial disaster planning was discussed at the South African Burns Society Congress in 2009, but there was no real involvement in the disaster planning prior to the 2010 World Cup; the country would have been poorly prepared had there been a burns disaster during the event. This article identifies some of the lessons learnt and strategies derived from major burns disasters and burns disaster planning from other regions. Members of the South African Burns Society are undertaking an audit of burns care in South Africa to investigate the feasibility of a national burns disaster plan. This audit (which is still under way) also aims to identify weaknesses of burns care in South Africa and implement improvements where necessary.
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    Multiple expansion refrigeration cycles
    (1986) Browne, J A; Gryzagoridis, J
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    On the equivalent flexural rigidity of sandwich composite panels
    (2015) Gryzagoridis, J; Oliver, G; Findeis, D
    The International Society for Burns Injuries (ISBI) has published guidelines for the management of multiple or mass burns casualties, and recommends that 'each country has or should have a disaster planning system that addresses its own particular needs.' The need for a national burns disaster plan integrated with national and provincial disaster planning was discussed at the South African Burns Society Congress in 2009, but there was no real involvement in the disaster planning prior to the 2010 World Cup; the country would have been poorly prepared had there been a burns disaster during the event. This article identifies some of the lessons learnt and strategies derived from major burns disasters and burns disaster planning from other regions. Members of the South African Burns Society are undertaking an audit of burns care in South Africa to investigate the feasibility of a national burns disaster plan. This audit (which is still under way) also aims to identify weaknesses of burns care in South Africa and implement improvements where necessary.
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    Tap testing of composites benchmarked with digital shearography
    (2014) Gryzagoridis, J; Findeis, D
    The International Society for Burns Injuries (ISBI) has published guidelines for the management of multiple or mass burns casualties, and recommends that 'each country has or should have a disaster planning system that addresses its own particular needs.' The need for a national burns disaster plan integrated with national and provincial disaster planning was discussed at the South African Burns Society Congress in 2009, but there was no real involvement in the disaster planning prior to the 2010 World Cup; the country would have been poorly prepared had there been a burns disaster during the event. This article identifies some of the lessons learnt and strategies derived from major burns disasters and burns disaster planning from other regions. Members of the South African Burns Society are undertaking an audit of burns care in South Africa to investigate the feasibility of a national burns disaster plan. This audit (which is still under way) also aims to identify weaknesses of burns care in South Africa and implement improvements where necessary.