Hardening evolution and ductile fracture initiation properties in three orientations of S700MC ultra-high-strength structural steel

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-04-25 DOI:10.1016/j.tws.2025.113375

Mingxu Shang , Hua Yang

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Abstract

Ultra-high-strength structural steels have gained more attention in the field of civil engineering due to their extremely high strength-to-weight ratio. Due to the practical need for assessing the cold bendability of S700MC ultra-high-strength structural steel by means of plasticity and ductile fracture model, a series of notched tensile specimens highly correlated with the stress states of uniaxial tension and plane strain was tested in this study. Additionally, in our pre-investigation, it was found that the hardening and ductile fracture properties of S700MC steel are highly sensitive to the orientation. Thus, three typical orientations, including rolling direction (0°), diagonal direction (45°) and transverse direction (90°), are incorporated in the testing programme considering the standard operation of actual processing. Based on the experimental flow curves along three orientations, an updated Hill48 plasticity model coupled with the effect of hardening evolution was introduced, calibrated, and subsequently applied to the three-point bending test and the tensile tests of stress-state-dependent notched specimens. With good agreement between experimental and simulated results, the loading paths, defined as a function of the equivalent plastic strain in terms of the stress triaxiality and the Lode angle parameter, are extracted from the finite element models along different orientations. Under the framework of the partially coupled ductile fracture model, three classic models including the Hosford-Coulomb model, the modified Mohr-Coulomb model, and the Lou-Huh model, were calibrated and validated in three orientations of the metallic material. Finally, aiming at assessing the cold bendability in three typical orientations of S700MC steel sheet, a parametric analysis, regarding the types of fracture locus and the ratio of punch radius to thickness, was conducted with the built-up constitutive models, providing a basis for the manufacturing of S700MC steel products.

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S700MC超高强度结构钢三取向硬化演化及韧性起裂性能

超高强度结构钢由于具有极高的强度与重量比，在土木工程领域受到越来越多的关注。由于实际需要通过塑性和韧性断裂模型来评估S700MC超高强度结构钢的冷弯曲性能，本研究对一系列与单轴拉伸和平面应变应力状态高度相关的缺口拉伸试样进行了试验。此外，在我们的预研究中发现，S700MC钢的硬化和韧性断裂性能对取向高度敏感。因此，考虑到实际加工的标准操作，在测试程序中纳入了滚动方向（0°）、对角方向（45°）和横向方向（90°）三种典型方向。基于三个方向的试验流动曲线，引入并校正了考虑硬化演化效应的Hill48塑性模型，并将其应用于应力状态相关缺口试件的三点弯曲试验和拉伸试验。在实验结果与模拟结果吻合良好的情况下，从有限元模型中提取了沿不同方向的加载路径，并将加载路径定义为应力三轴性与Lode角参数的等效塑性应变函数。在部分耦合韧性断裂模型的框架下，对霍斯福特-库仑模型、修正的莫尔-库仑模型和劳-哈模型3种经典模型在金属材料的3个方向上进行了标定和验证。最后，针对S700MC钢板在三种典型取向下的冷弯曲性能进行了评估，利用建立的本构模型对断裂轨迹类型和冲孔半径与厚度之比进行了参数化分析，为S700MC钢板产品的制造提供了依据。

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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.