The previous paper[1] reported the fracture test results using pipe models (8B and 14B for bending) with an alloy 132 weld joint at room temperature and high temperature (325degC). The predicted loads by limit load evaluation method of the pipes at 325 deg C (8B and 14B) and at room temperature (8B) with the initial surface flaw whose depth is 75% of the pipe thickness were in good agreement with the maximum test loads. However 14B pipe at room temperature, the predicted load has 20% unconservative difference from the measured data.

To predict the different fracture behavior or fracture mode of the same welding material at a flaw location with different flaw or model geometry by numerical procedure without large sized test model, Gurson model[2] was applied on trial to the two types of the pipe models with a circumferential or an axial flaw and one plate model for simplification for the case of the pipe with an axial flaw. As a result the plate model predicted the penetration pressure of the pressure test of the pipe with an axial flaw with 1.3times larger than the test result, while the pipe model with an axial flaw over-predicted the test result by 1.45 times. On the other hand the maximum load around crack penetration of the pipe model with a circumferential flaw was 0.9 times of the test results. Discussions for application of Gurson model were made.

This content is only available via PDF.
You do not currently have access to this content.