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Limit loads and fracture mechanics parameters for thick-walled pipes
Kim, N.H.,Oh, C.S.,Kim, Y.J.,Kim, J.S.,Jerng, D.W.,Budden, P.J. Applied Science Publishers ; Elsevier Science Ltd 2011 The International journal of pressure vessels and Vol.88 No.10
In this paper, information on plastic limit loads and both elastic and elastic-plastic fracture mechanics parameters is given for cracked thick-walled pipes with mean radius-to-thickness ratios ranging from two to five. It is found that existing limit load expressions for thin-walled pipes can be applied to thick-walled pipes, provided that they are normalized with respect to the corresponding un-cracked thick-walled pipe values. For elastic fracture mechanics parameters, FE values of the influence functions for the stress intensity factor and the crack opening displacement are tabulated. For elastic-plastic J, it is shown that existing reference stress based J estimates can be applied, provided that a proper limit load for thick-walled pipes is used.
Han, J.J.,Lee, K.H.,Kim, N.H.,Kim, Y.J.,Jerng, D.W.,Budden, P.J. Applied Science Publishers ; Elsevier Science Ltd 2012 The International journal of pressure vessels and Vol.89 No.-
This paper compares published experimental plastic collapse loads for 90<SUP>o</SUP> elbows with existing closed-form solutions. A total of 46 experimental data are considered, covering pure bending (in-plane closing, in-plane opening and out-of-plane bending) and combined pressure and bending loads. The plastic collapse load solutions considered are from the ASME code, the Ductile Fracture handbook of Zahoor, by Chattopadhyay and co-workers, and by Y.-J. Kim and co-workers. Comparisons with the experimental data shows that the ASME code solution is conservative by a factor of 2 on collapse load for in-plane closing bending, 2.3 for out-of-plane bending, and 3 for in-plane opening bending. The solutions given by Kim and co-workers give the least conservative estimates of plastic collapse loads, although they provide slightly non-conservative estimates for some data.