摘要
介绍了超声波法应力测量的理论基础声弹性方程,特殊条件下简化临界折射纵波声弹性方程。建立了超声波法测量焊接残余应力系统,实现了高精度信号提取,使用特制变角度超声波探头,选用对应力变化敏感的临界折射纵波作为测量波形,对低碳钢双丝焊对接平板横向残余应力场实现了无损测量。结果表明,测量结果可靠,测量过程实时无损快速。分析了测量数据波动的原因。建立的超声波法应力无损测量系统为焊接结构服役状态在线可靠性评估奠定了基础。
Based on the acoustical theory and the simplified acoustoelastic equation for Lcr wave,ultrasonic stress measurement installation was established which consisted of a special transducer and an oscillograph with special higher digitizer board.The Lcr wave which is sensitive to stress is suitable to measure welding residual stress.Acoustoelastic coefficient of longitudinal critically refracted waves propagating in Q235 steel was obtained by tensile testing machine.The transverse stress of twin wire welded pla...
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2008年第5期30-32,114,共4页
Transactions of The China Welding Institution
基金
黑龙江省博士后资助项目(FFCZ98505364)
中俄政府间科技合作项目(2007DFR70070)
