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The robotic fiber placement (RFP) process depends on continuous fusion bonding and solidifying of prepreg tows onto a substrate by subjecting them to a compression force and heat flux. However the advantages provided when using the RFP to fabricate the composite structures, it has adverse effects due to the induced residual stresses (RSs). The current work presents the effect of the RFP on the induced...
The paper deals with the numerical simulation and experimental investigations of a buried‐arc welding process on a butt‐welded plate sample. In the numerical investigations, the finite element analysis is carried out by applying the element birth and death technique in the thermal analysis, while the mechanical analysis is performed simultaneously in one step to reduce simulation time. The temperature...
Abstract: Moiré interferometry combined with hole‐drilling is an effective method for measuring welding residual deformation. In this study, two lap‐welded rectangular steel plates with different overlap widths were manufactured, and cross‐gratings with a frequency of 1200 lines per mm were replicated on test areas of the welds. Sixteen through holes were drilled in the plates to release residual...
Abstract: Residual stress calibration coefficients are used to calculate residual stresses from the measured strains relieved during hole‐drilling. The current residual stress measurement practice interpolates the published non‐dimensional coefficients for a given measurement condition. Errors are always introduced from the interpolation. In addition, the calibration coefficients vary with respect...
Abstract: This part deals with the applications of the influence functions developed in part I to solve the inverse problem of determining residual stresses from the measured relaxed strains. The effects of the hole eccentricity and the number of strain gauges on the accuracy of the reconstructed residual stresses are considered for typical experimental conditions. Influence functions for eccentric...
Abstract: Residual stresses play a fundamental role in predicting the resistance of several structural components, in particular when operating under alternating loads or in aggressive environments. Among the measurement techniques, the hole‐drilling method is unrivalled in terms of cost and flexibility. The currently available data reduction techniques do not account for some important parameters,...
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