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ABS - 329

GUIDANCE NOTES ON FRACTURE ANALYSIS FOR MARINE AND OFFSHORE STRUCTURES

active, Most Current
Organization: ABS
Publication Date: 1 February 2022
Status: active
Page Count: 64
scope:

Introduction

General

Fatigue and fracture are significant failure modes for marine and offshore structures under wave-induced loads and other loads such as vibration-induced loads during service. Many failures on marine and offshore structures surprise engineers because of the unexpected crack initiation and propagation at welded connections under cyclic loads. A crack at a critical area in a structure can initiate and propagate until the final failure occurs under static or dynamic loads.

ABS Rules and Guides for the classification of ship and offshore structures require fatigue assessment in the design, which also specifies material toughness requirements and detailed analysis methods. These methods for evaluating the fatigue life are intended for determining design requirements as well as inservice assessment.

After a ship or offshore structure is in service for a certain period, flaws may occur at critical locations due to dynamic loads such as wave-induced loads, vibration-induced loads, etc. Flaws also may occur due to undetected construction issues such as weld inclusions and structural misalignments. The types of flaws refer to Subsection 5/1.2. Flaws and defects observed on a structure are usually required to be repaired according to established procedures and the applicable ABS Rules. However, it could happen that flaws are unable to be repaired immediately.

The presence of a flaw in a ship, offshore structure, or equipment could have an impact on structural integrity and present safety concerns. In such cases, the fracture mechanics method can be applied to analyze crack propagation and to evaluate the probable influence on structural integrity under service loads. Note that any damages and repairs on ABS Classed vessels/units are to be communicated to ABS in accordance with the Section 1-1-8 of the ABS Rules for Conditions of Classification (Part 1) or Section 1-1-8 of the ABS Rules for Conditions of Classification - Offshore Units and Structures (Part 1).

Document History

329
February 1, 2022
GUIDANCE NOTES ON FRACTURE ANALYSIS FOR MARINE AND OFFSHORE STRUCTURES
Introduction General Fatigue and fracture are significant failure modes for marine and offshore structures under wave-induced loads and other loads such as vibration-induced loads during service....

References

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