Experimental and numerical investigation of fracture toughness in the heat-affected zone of FH36 steel for LCO₂ vessels

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-09-10 DOI:10.1016/j.tws.2025.113962

Yu Yao Lin , Jin Ha Hwang , Nak-Kyun Cho , Kyu Sik Park , Xing Ya Feng , Binbin Li , Do Kyun Kim

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引用次数: 0

Abstract

With increasing decarbonisation demands, the structural safety of liquefied carbon dioxide (LCO₂) carriers in low-temperature environments has gained attention. Cracks significantly reduce structural service life, and fracture toughness is an essential material property for assessing the crack stability. Cracks tend to form in welded regions due to stress concentration. While some fracture toughness tests on the heat-affected zone (HAZ) at low temperatures have been conducted, numerical simulation studies remain limited. Firstly, this study experimentally evaluates the fracture toughness of FH36 steel base material and HAZ specimens under both room and low temperatures. To further investigate the experimental process and establish a constitutive model, finite element simulations of the testing process are performed, which incorporates a stress-modified fracture strain (SMFS) model to account for material damage. Furthermore, a new method for determining material parameters in the SMFS model is proposed, and a numerical approach for simulating fracture in the HAZ at low temperatures is developed. The resulting fracture toughness data and damage model are expected to provide reliable support for structural safety assessments in low-temperature environments.

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LCO₂容器用FH36钢热影响区断裂韧性的实验与数值研究

随着脱碳需求的增加，低温环境下液化二氧化碳（LCO₂）载体的结构安全性受到了人们的关注。裂纹会显著降低结构的使用寿命，断裂韧性是评估裂纹稳定性的重要材料性能。由于应力集中，焊接区域容易形成裂纹。虽然对低温热影响区（HAZ）进行了一些断裂韧性试验，但数值模拟研究仍然有限。本研究首先对FH36钢基材和热影响区试样在室温和低温下的断裂韧性进行了实验评价。为了进一步研究试验过程并建立本构模型，对试验过程进行了有限元模拟，其中纳入了考虑材料损伤的应力修正断裂应变（SMFS）模型。此外，提出了一种确定SMFS模型中材料参数的新方法，并开发了一种模拟HAZ低温断裂的数值方法。由此得到的断裂韧性数据和损伤模型有望为低温环境下的结构安全评估提供可靠的支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.