Metal materials can inevitably show deteriorated properties by the factors of stress, temperature, and environmental erosion in\ndistinct operating environments. Without proper protection, the service life would be shortened or even deadly danger would\nbe caused. This study aims to apply Finite Element Method and Boundary Element Method to analyzing the effects of corroded\npetrochemical pipes on the fatigue life and the fracture form.The research results of nondestructive testing and software analyses\nshow that cracked oil pipes with uniform corrosion bear larger stress, mainly internal pressure, on the longitudinal direction than\nthe circumferential direction. As a result, the maximal fatigue loading cycle of a circumferential crack is higher than that of a\nlongitudinal one. From the growing length and depth of a crack, the final aspect ratio of crack growth appears in 2.42ââ?¬â??3.37 and\n2.71ââ?¬â??3.42 on the circumferential and longitudinal direction, respectively.Meanwhile, the ratios of loading cycles of circumferential\nand longitudinal crack are 26.23 on uncorroded and 20.54 on general metal loss oil pipe. The complete crack growth and the\ncorrespondent fatigue loading cycle could be acquired to determine the service life of the oil pipe being operated as well as the\nsuccessive recovery time.
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