Abstract
In this study, the accuracy of blind-hole method on weld residual stress estimation is investigated. A modified parameter group has also proposed to improve the accuracy. The thermal-elastic-plastic finite element model is employed to build up the residual stress distribution and the blind-hole process. The MSC Marc finite element software package is used to simulate the welding process and the welding residual stress and strain distributions around the weld of two inconel 690 alloy plates filled with I-52 GTAW filler. Then the process of the traditional blind hole is simulated by employing the inactive elements. The data of the residual strain variations of strain gages located around the blind hole is introduced into the blind-hole method to estimate the original residual stress components at the hole center. The effects of drilling depth, drilling size, gage radius, gage position, and the distance on the accuracy of estimated residual stress have also been studied and discussed. Based on the residual stress components simulated from the welding process, a modified stress parameter group has also been proposed to improve the accuracy of blind-hole method. Numerical results indicate that the accuracy of estimated residual stress can be improved significantly by employing the proposed blind-hole parameters.
Highlights
The hole-drilling strain-gage method can be divided into through-hole drilling and blind-hole drilling (BHD) methods
Because the BHD method only generates local fractures, and the small hole drilled typically does not affect the normal usage of mechanical objects, the BHD method has been widely applied in industrial practice
ASTM norms, the corrected coefficients effectively improve the accuracy of the BHD method in estimating the residual stress in welding
Summary
The hole-drilling strain-gage method can be divided into through-hole drilling and blind-hole drilling (BHD) methods. The effect on the result of BHD parameters, such as changes in hole depth, distance from the welding bead center, initial position of the strain gage, gage radius ratio, and hole radius, was observed. The least square error method was applied to correct the non-dimensional coefficients proposed by ASTM norms, thereby determining the non-dimensional parameters that improve the estimation accuracy.
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