FE calculation and analysis of the I type dent size influence on peak cycle stress

摘要

Dent, which is one of the important factors affecting pipeline fatigue life, substantially reduces the fatigue life of the pipeline in service. The peak cycle stress on dented pipeline is a key parameter in calculating the fatigue life. Finite element models of I type dent are established under different circumstances. On the basis of considerable calculations, the results are subjected to univariate analyses, yielding the dependences of peak cycle stress on different parameters. The calculation results are fitted by non-linear regression. The relationships between the peak cycle stresses of dented pipeline and the dent depth, the dent longitudinal length are acquired by establishing mathematical models and proposing the corresponding expressions.