摘要
通过焊接加工奥氏体型S30408和双相型S22253两种材料牌号的8个不锈钢箱形截面试件,利用线切割将试件截面完全分割成条带,采用Whittemore手持应变仪量测各条带上释放的残余应变,从而测得试件截面上的残余应力大小与分布形态.试验结果表明,试件截面内残余拉应力峰值一般低于材料的名义屈服强度,奥氏体型S30408和双相型S22253两种不锈钢试件分别达到其名义屈服强度的80%和60%;而组成板件残余压应力的峰值随板件宽厚比的增大而降低.根据整理得出的残余应力量测结果,基于原有普通钢材焊接箱形截面的残余应力分布模型,提出了能够准确预测不锈钢焊接箱形截面残余应力分布的简化模型.测得的残余应力数据和提出的简化分布模型适用于不锈钢结构构件稳定性的相关研究.
Eight stainless steel box sections fabricated by welding, including austenitic grade S30408 and duplex grade S22253, were sectioned into small strips by means of the wire-cutting technology. A mechanical Whittemore gage was used to measure the relieved residual strains, and the magnitudes and distributions of the welding residual stresses in the test specimens were obtained. The experimental results show that the peak values of the tensile residual stress are always lower than the materials＇ nominal yield strength, reaching 80% and 60% of the yield strengths for grades S30408 and S22253, respectively. Meanwhile, the peak compressive residual stress in plates decreases with the increase in the width-to-thickness ratio. Based upon the obtained measurement results and existing distribution models for carbon steel sections, the new accurate prediction models for residual stress distributions in welded stainless steel box sections were proposed. In general, the obtained test data and the proposed distribution models are suitable for further research on stability of fabricated structural stainless steel members.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第5期979-985,共7页
Journal of Southeast University：Natural Science Edition
基金
高等学校博士学科点专项科研基金资助项目(20110002130002)
教育部博士研究生学术新人奖资助项目
北京市自然科学基金资助项目(8112018)
关键词
残余应力
不锈钢
焊接箱形截面
分布模型
分割法
residual stress
stainless steel
welded box section
distribution model
sectioning method
