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Browsing Materials Research Group publications by Author "Australasian Congress on Applied Mechanics (6th : 2010 : Perth, Western Australia)"
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Item Metadata only Dynamic behaviour of transporting liquid under impulse loading(Engineers Australia, 2010) Mohammad, R.; Kotooussov, A.; Codrington, J.; Australasian Congress on Applied Mechanics (6th : 2010 : Perth, Western Australia)Item Metadata only Experimental apparatus and preliminary investigations of friction and wear phenomena in water-lubricated bearings(Engineers Australia, 2010) Solomonov, Y.; Kotooussov, A.; Brown, I.; Harding, S.; Australasian Congress on Applied Mechanics (6th : 2010 : Perth, Western Australia)Item Metadata only Influence of pre-fatigue microdamage on the fracture of human cortical bone(Engineers Australia, 2010) Codrington, J.; Tsangari, H.; Blazewicz, A.; Fazzalari, N.; Kotooussov, A.; Australasian Congress on Applied Mechanics (6th : 2010 : Perth, Western Australia)Item Metadata only Integrity of the osteocyte bone cell network in osteoporotic fracture: implications for mechanical load adaptation(IOP Publishing, 2010) Kuliwaba, V.; Truong, L.; Codrington, J.; Fazzalari, N.; Australasian Congress on Applied Mechanics (6th : 2010 : Perth, Western Australia); Khalili, N.; Valliappan, S.; Li, Q.; Russell, A.The human skeleton has the ability to modify its material composition and structure to accommodate loads through adaptive modelling and remodelling. The osteocyte cell network is now considered to be central to the regulation of skeletal homeostasis; however, very little is known of the integrity of the osteocyte cell network in osteoporotic fragility fracture. This study was designed to characterise osteocyte morphology, the extent of osteocyte cell apoptosis and expression of sclerostin protein (a negative regulator of bone formation) in trabecular bone from the intertrochanteric region of the proximal femur, for postmenopausal women with fragility hip fracture compared to age-matched women who had not sustained fragility fracture. Osteocyte morphology (osteocyte, empty lacunar, and total lacunar densities) and the degree of osteocyte apoptosis (percent caspase-3 positive osteocyte lacunae) were similar between the fracture patients and non-fracture women. The fragility hip fracture patients had a lower proportion of sclerostin-positive osteocyte lacunae in comparison to sclerostin-negative osteocyte lacunae, in contrast to similar percent sclerostin-positive/sclerostin-negative lacunae for non-fracture women. The unexpected finding of decreased sclerostin expression in trabecular bone osteocytes from fracture cases may be indicative of elevated bone turnover and under-mineralisation, characteristic of postmenopausal osteoporosis. Further, altered osteocytic expression of sclerostin may be involved in the mechano-responsiveness of bone. Optimal function of the osteocyte cell network is likely to be a critical determinant of bone strength, acting via mechanical load adaptation, and thus contributing to osteoporotic fracture risk.Item Metadata only New damage detection technique based on governing differential equations of continuum mechanics. Part I: out-of-plane loading(Engineers Australia, 2010) Wildy, S.; Kotooussov, A.; Cazzolato, B.; Codrington, J.; Australasian Congress on Applied Mechanics (6th : 2010 : Perth, Western Australia)In this paper a new method for the detection of delamination damage in composite beams using scanning Doppler laser vibrometry is presented. The recent advances in scanning laser technology now allow very accurate measurement of displacement fields, which in the case of undamaged structure must satisfy the fundamental equations of continuum mechanics. A violation of these equations at specific locations indicates the presence of the damage, which can be detected and sized by utilising a defect search algorithm.Item Metadata only New damage detection technique based on governing differential equations of continuum mechanics. Part II: in-plane loading(Engineers Australia, 2010) Wildy, S.; Cazzolato, B.; Kotooussov, A.; Australasian Congress on Applied Mechanics (6th : 2010 : Perth, Western Australia)This paper discusses a new method for detection of crack damage in plate structures based on direct application of with a 3D scanning laser vibrometer. The recent advances in scanning laser technology now allow a very accurate measurement of the displacement field, which in the case of undamaged structure must satisfy the fundamental equations of continuum mechanics everywhere. A violation of these equations at specific locations indicates the presence of the damage, which can be detected and sized by utilising a defect search algorithm.Item Metadata only New method for accurate strain measurements utilising a 3D scanning laser doppler vibrometer(Engineers Australia, 2010) Wildy, S.; Cazzolato, B.; Kotooussov, A.; Weisbecker, H.; Australasian Congress on Applied Mechanics (6th : 2010 : Perth, Western Australia)This paper presents some initial results on the development of a new experimental technique for accurate non-contact measurements of strain fields based on the recent advances in 3D scanning laser vibrometry. The underlying theory of laser vibrometry is initially reviewed. The technique has been applied to several plate specimens where the experiment results are presented, followed by a discussion of the advantages and limitations of this advanced technique, which has many exciting potential applications in modern engineering and technology.Item Metadata only Some new developments in 3D fracture mechanics(Engineers Australia, 2010) Kotooussov, A.; Berto, F.; Lazzarin, P.; Harding, S.; Australasian Congress on Applied Mechanics (6th : 2010 : Perth, Western Australia)