Evaluation of fracture toughness according to the pre-strain and temperature effect with H-Section S420 steel for deep sea offshore structures

被引：2

作者：

An, Gyubaek ^{[1
]}

Park, Jeongung ^{[1
]}

Joo, Woonjun ^{[1
]}

Seong, Daehee ^{[1
]}

机构：

[1] Chosun Univ, Dept Neurol, Gwangju, South Korea

来源：

OCEAN ENGINEERING | 2024年 / 296卷

关键词：

H-section steel; Offshore structure; Fracture toughness; Critical CTOD (crack tip opening displacement); Pre-strain; CGHAZ (coarse grain heat affected zone); SCHAZ (subcritical heat affected zone); NEUTRON-DIFFRACTION; GIRTH WELDS; RESIDUAL-STRESSES; PIPES; ASSESSMENTS;

D O I：

10.1016/j.oceaneng.2024.117028

中图分类号：

U6 [水路运输]; P75 [海洋工程];

学科分类号：

0814 ; 081505 ; 0824 ; 082401 ;

摘要：

This study examined the effect of pre-strain on fracture toughness for H-section S420 steel base plates and welds, focusing on the significance of heat-affected zone (HAZ) fracture toughness after pre-strain. Once an offshore structure is installed, it is fixed in the same place for decades, making it essential to secure fracture stability against the damage that might occur owing to sea conditions. In particular, the effect of pre-strain on the fracture toughness of three types of specimens (without pre-strain, 3% pre-strain, and 6% pre-strain) was investigated. Further, an appropriate pre-strain amount in the offshore structure to ensure fracture safety was proposed. The damage suffered by the steel structure decreased for not only the base metal but also the weld joint. The Hsection steel satisfied the requirement of critical crack tip opening displacement (CTOD) of up to 6% pre-strain in coarse grain HAZ (CGHAZ). Furthermore, the temperature satisfying the critical CTOD could be predicted using WES 2805.

引用

页数：13