数字散斑干涉应力应变同步测量OA

Optical glass presents significant challenges for strain-stress measurement,and full-field syn-chronous acquisition remains difficult to achieve.An opposed dual-path measurement system based on Dig-ital Speckle Pattern Interferometry(DSPI)is developed.Synchronous triggering is realized using signals from a tensile testing machine,with a maximum acquisition delay of less than 2.2 s.System accuracy is evaluated through Finite Element Analysis(FEA).Parallel reflective and transmissive optical paths are employed to extract surface speckle and birefringence phase information.Axial tensile tests are conducted on quartz glass specimens under loads ranging from 50 N to 170 N,enabling synchronous acquisition of full-field strain and stress data.Repeatability tests confirm the stability and general applicability of the re-sults.An equal-scale finite element model is established,and experimental results are systematically com-pared with simulations.Measurement errors and their sources are analyzed in detail.Experimental contour maps show strong agreement with simulation results.The average relative error in strain over the full range is 9.2%,while the stress measurement error is controlled within 7.8%.Measured values are slight-ly higher than simulated ones.The discrepancies are primarily attributed to loading eccentricity,fixture preload,and geometric coupling effects induced by oblique incidence.Additional bending moments and de-flections are captured by the proposed system but are absent in idealized FEA models.The system satisfies engineering analysis requirements and demonstrates distinct advantages in full-field synchronous measure-ment.It provides effective support for failure analysis and optimization of optical components and exhibits strong adaptability to complex force-optical coupling environments.