卓子超, 张庆亚, 王江超. 船板钢焊接接头的断裂失效行为及GTN模型的数值分析[J]. 工程力学, 2020, 37(11): 238-247. DOI: 10.6052/j.issn.1000-4750.2019.12.0746
引用本文: 卓子超, 张庆亚, 王江超. 船板钢焊接接头的断裂失效行为及GTN模型的数值分析[J]. 工程力学, 2020, 37(11): 238-247. DOI: 10.6052/j.issn.1000-4750.2019.12.0746
ZHUO Zi-chao, ZHANG Qing-ya, WANG Jiang-chao. FRACTURE BEHAVIOR OF WELDED JOINTS OF SHIP STEEL PLATES AND NUMERICAL ANALYSIS WITH GTN MODEL[J]. Engineering Mechanics, 2020, 37(11): 238-247. DOI: 10.6052/j.issn.1000-4750.2019.12.0746
Citation: ZHUO Zi-chao, ZHANG Qing-ya, WANG Jiang-chao. FRACTURE BEHAVIOR OF WELDED JOINTS OF SHIP STEEL PLATES AND NUMERICAL ANALYSIS WITH GTN MODEL[J]. Engineering Mechanics, 2020, 37(11): 238-247. DOI: 10.6052/j.issn.1000-4750.2019.12.0746

船板钢焊接接头的断裂失效行为及GTN模型的数值分析

FRACTURE BEHAVIOR OF WELDED JOINTS OF SHIP STEEL PLATES AND NUMERICAL ANALYSIS WITH GTN MODEL

  • 摘要: 船舶钢结构皆采用焊接方法建造而成,在实际工况及环境载荷作用下,焊接接头的力学性能及其断裂强度,直接影响船舶整体结构的强度和寿命。该文针对常用的船板钢材料(Q345和Q690),首先对母材进行单向拉伸试验,获得其各自的应力-应变曲线,进而评估其断裂性能;基于Gurson-Tvergaard-Needleman (GTN)损伤模型,通过程序代码的调试和一系列的数值模拟分析,提出了母材本构关系的表达函数及最优GTN模型参数,且与实测的应力-应变曲线高度吻合。同时,针对满足焊接规范要求的船板钢对接焊接头,进行了单向拉伸试验获得其应力-应变曲线;考虑焊缝微观缺陷以及焊接残余应力的影响,提出修正GTN损伤模型中的初始空穴体积分数f0和材料的幂函数塑性强化参数,预测焊接接头的断裂强度,且与试验测量数据吻合一致。

     

    Abstract: Ship steel structures are always fabricated by welding, while mechanical performance and fracture strength of welded joints significantly influence the strength and service life of the whole ship considering the impact of actual working condition and external loading. In this study, base materials of ship steel plate (Q345 and Q690) were examined by uniaxial tension test to establish strain-stress curves, which can be employed for the assessment of fracture performance. Aiming at Gurson-Tvergaard-Needleman (GTN) failure mode, computational code was programmed and a series of numerical analyses were carried out to investigate the fracture behavior of ship steel plate, while constitutive relations of the examined ship steel plates were proposed with optimized parameters of GTN failure mode. In addition, computation results of strain-stress curves have a good agreement with experimental data. Concentrating on the butt welded joints of ship steel plate with high welding quality, uniaxial tension test was also conducted to obtain stress-strain curves of welded joints. In order to consider the influence of micro welding defects and welding residual stress on fracture performance of welded joints, modified initial void volume fraction and plastic hardening parameters were proposed, and good agreement between computation results and measurements was observed for fracture performance of welded joints.

     

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