Elastic analysis of semi-elliptical axial in cylinders under thermal shockusing the BS 7910 framework

One of the most common and important situations involving flaws in pressure vessels in the internal thermal shock of a hollow circular cylinder with a n axial semi-elliptical internal surface crack. The current approaches avai lable to analyse this specific problem are excessively conservative or cumb ersome. This paper considers the internal thermal shock problem and determi nes the stress-intensity factors for shallowest and deepest points for cyli nders with the ratio of thickness to inner radius 0.1 and 0.25. The results of calculations are presented in a similar form to the draft standard BS 7 910:1997 and thus permit numerous practical applications. These results are in many cases much less conservative than the draft standard and also reve al some important cases. (C) 1999 Elsevier Science Ltd. All rights reserved .