Q460高强钢材及T形对接接头超低周疲劳特性

邱晨,邢佶慧,张丽,王涛

振动与冲击 ›› 2021, Vol. 40 ›› Issue (16) : 166-174.

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PDF(3439 KB)
振动与冲击 ›› 2021, Vol. 40 ›› Issue (16) : 166-174.
论文

Q460高强钢材及T形对接接头超低周疲劳特性

  • 邱晨1,邢佶慧1,张丽2,王涛1
作者信息 +

Ultra-low cycle fatigue properties of Q460 high strength T-shape butt weld joints

  • QIU Chen1,XING Jihui1,ZHANG Li2,WANG Tao1
Author information +
文章历史 +

摘要

为明确高强钢材焊接接头的超低周疲劳特性,进行了Q460高强钢母材、焊缝、热影响区钢材及T形全熔透对接焊接接头的超低周疲劳加载试验,基于试验结果校正了Q460高强钢材的随动-等向混合强化材性参数,识别了其循环微孔扩张模型(CVGM)微观断裂预测模型参数,在ABAQUS软件中建立Q460高强钢T形焊接接头的精细化三维有限元模型,采用CVGM模型准确预测了焊接接头循环荷载下的延性断裂行为,继而变化板厚、板件夹角和板件标准段长度针对接头断裂性能进行了参数分析。结果表明,往复荷载作用下,Q460高强T形对接接头失效前内部存在两处危险地带,即钢板内逐步形成的塑性条带和热影响区,接头的断裂特性取决于这两处的缺陷和损伤累积状况。随着板厚、板件夹角和板件标准段长度的增加,对接接头的超低周疲劳寿命断裂延长,位移延性系数增大。

Abstract

In order to study the ultra-low fatigue properties of high strength steel welded joints, tests on weld metal, heat-affected zone and base metal of Q460 high strength steel materials as well as T-shape fully penetration butt weld connections were performed under ultra-low cyclic loads.Based on tested results of Q460 steel coupons, both combined kinematic-isotropic hardening material parameters and cyclic void growth model (CVGM) micro-mechanical fracture model parameters were calibrated.Three-dimensional refined FE analysis models were built and incorporated with the CVGM method in ABAQUS to predict ductile fracture behaviors of Q460 high strength T-shape butt weld joints under cyclic loads.Furthermore, parametric analyses were also conducted on T-shape butt weld joints with varying plate thickness, plate angles, and standard segment length of plates.Research results show that there are two dangerous areas in the T-shape joint, ie.plastic strip developed in the middle part of the steel plate and heat-affected zone.Fracture properties of the joint are determined according to defects and damage accumulation status in these two areas.Ultra-low cycle fatigue life and ductility of T-shape joint increase with plate thickness, plate angles and standard segment length of plates.

关键词

Q460高强钢 / T形 / 全熔透对接接头 / 超低周疲劳 / 断裂 / 延性

Key words

Q460 high strength steel / T-shape / fully penetration butt weld connection / ultra-low cycle fatigue / fracture / ductility

引用本文

导出引用
邱晨,邢佶慧,张丽,王涛. Q460高强钢材及T形对接接头超低周疲劳特性[J]. 振动与冲击, 2021, 40(16): 166-174
QIU Chen,XING Jihui,ZHANG Li,WANG Tao. Ultra-low cycle fatigue properties of Q460 high strength T-shape butt weld joints[J]. Journal of Vibration and Shock, 2021, 40(16): 166-174

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