基于数字相关法的应力应变检测技术及应用

Application and Technology of Stress and Strain Measurement Based on Digital Speckle Correlation Method

借助高准确度数字散斑相关技术并结合标记点法,对工作的热风炉进行了实时位移和应变检测.测试了环向和轴向位移和应变,得出热风炉壳的位移场等直线,即环向位移呈现竖向条纹,轴向位移总体呈现水平状位移等值线,并且位移数据较为均匀.由位移场得到了应变场,由于温差变化不大,由此产生的最大热应力为63.85MPa.数字散斑相关技术所测结果与标记点法所测数据吻合.现场检测表明,炉壁外表面,由热交换引起的应力远小于钢材的许用应力,所以结构运行安全.

The stress states are measured for hot wind furnace of balst in working and reliable data are supplied for safety operation.Dispalcements and strains of shell of hot wind furnace are measured by digital speckle correlation method(DSCM) in real time.Simultaneously,mark point method is also adopted for measuring the displacements and strains of hot wind furnace shell in order to compare the results obtained by DSCM.In the experiment,displacements and strains of circular and axial direction for furnace shell are obtained successfully.And the results obtained by DSCM and mark point method agree well.Through on-the-spot test,it can be concluded that the working stresses are lower than permissible stresses under different working states for hot wind furnace.So the operation of the hot wind furnace is safety.