«Proceedings of Gubkin University»

RESULTS OF EXPERIMENTAL STUDY OF PROCESSES OF FATIGUE FRACTURE IN RECOVERED WELDED JOINTS OF OFFSHORE OIL AND GAS INSTALLATIONS

UDC: 622.242.422:622.276.04:622.279.04
DOI: -

Authors:

¹ Gubkin Russian State University (National Research University) of Oil and Gas

Keywords: offshore oil and gas structures, fatigue cracks, restored welds, resource evaluation

Annotation:

The study of fatigue processes occurring in the reconstructed welded joints, is an urgent task, allowing to define the terms of safe operation of offshore oil and gas installations. At the present time estimation of the resource of the recovered welded joints is not possible, because existing theories only allow us to calculate the resource for new joints. In this connection research facilities were developed to study "K" and "T" shaped welds used in the offshore oil and gas installations. During the experiment fracturing was initiated in the new welded joint, and then the joint was repaired and destroyed again. Based on these experiments, mathematical relationships were derived to describe the process of fatigue failure in the recovered welds in offshore oil and gas installations. These depend on the number of cycles and amplitude values of stresses. Factors causing their premature fatigue failure were analyzed and recommendations for assessing the resource of the recovered welds were proposed.

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