Study on the Testing Technology of Main Residual Stress of Metal Sheet Based on Soft X-Ray Diffraction Stress Analyzer
For the characteristics of soft X-ray stress testing technology, a formula to resolve main residual stress is deduced based on analyzing the relationship between main residual stress and normal stress of different sections. The distribution of main stress of laser shock forming TA2 metal sheet is studied combined with the experimental study on the determining residual stress with soft X ray diffraction analyzer. The result shows that testing and calculating main residual stress is an important approach to study the deformation law of sheet metal material.
Abstract Three structural parameters were defined based on the characteristics of wire mesh filters: wire diameter, layer spacing and mesh size. The pressure drops across two different mesh pads were measured under different superficial air velocities in a wind tunnel. A new geometrical simplification method for numerical simulations was proposed. Using the large amount of calculated pressure drop data, a new expression was derived for predicting pressure drops across mesh pads. Good agreement was achieved among the experimental data, simulated data and expression data which demonstrated that the derived expression can accurately predict pressure drops.