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By Emerson H Duke; Stephen R Aguirre
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Extra resources for 3D imaging : theory, technology and applications
By observing the stress distributions computed using FEA, it was noted that the regions of elevated and peak wall stresses occurred at inflection points on the AAA surface, and not at regions of maximum diameter. , 2007, 2009a]. Inflection points are defined as points on the AAA surface at which the local AAA wall shape changes from concave outward to concave inward. 2836 MPa. The results of the computational stress analysis, along with the maximum diameter and UTS for each case can be seen in Table 3.
Table 3. Maximum diameter, FEA computed peak wall stress, location of peak wall stress, and UTS of peak stress region in all ten cases examined. Wall thickness was incorporated in peak wall stress calculations. , 2006b]. This RPI approach uses a more theoretical method of calculating wall strength, compared to the experimental approach of FEARI, and combining the two approaches may lead to improved predictions. Ultimately, the decision to surgically intervene may include a combination of factors including diameter, asymmetry, RPI and FEARI, along with clinical experience, and may determine the most suitable approach to a particular AAA.
Whereas, under-smoothing the models with control point number in excess of 20 may result in artificially high stressed areas and incorrect stress distributions. For a full description of the effect of modelling techniques on resulting AAA wall stress the reader can refer to Doyle et al. . , 2005] has identified the importance of asymmetry in idealised AAA models, and also indicated the need to investigate this aspect in realistic models. In this section, we have examined the role of asymmetry and resulting wall stress in realistic patient-specific AAA cases.