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Crack initiation processes in acrylic bone cement

By P. E. Sinnett-Jones, M. Browne, A. J. Moffat, J. R. T. Jeffers, N. Saffari, J.-Y Buffiere and I. Sinclair


A major constraint in improving the understanding<br/>of the micromechanics of the fatigue failure process<br/>and, hence, in optimizing bone cement performance is<br/>found in the uncertainties associated with monitoring the<br/>evolution of the internal defects that are believed to dominate in vivo failure. <br/><br/>The present study aimed to synthesize high resolution imaging with complementary damage monitoring/detection techniques. <br/><br/>As a result, evidence of the chronology of failure has been obtained. The earliest stages of crack initiation have been captured and it is proposed that, in the presence of a pore, crack initiation may occur away from the pore due to the combined influence of pore morphology and the presence of defects within regions of stress concentration. <br/><br/>Furthermore, experimental evidence shows that large agglomerations of BaSO4 are subject to microcracking during fatigue, although in the majority of cases, these are not the primary cause of failure.<br/><br/>It is proposed that cracks may then remain contained<br/>within the agglomerations because of the clamping effect<br/>of the matrix during volumetric shrinkage upon curing

Topics: Q1
Year: 2009
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Provided by: e-Prints Soton
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