Study of the residual strain in lap joints

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Journal titleJournal of Aircraft
Pages11451151; # of pages: 7
SubjectFuselage lap joint; Load ramp; Residual strain; Riveting process; Aerodynamic loads; Boundary conditions; Computer simulation; Fatigue of materials; Finite element method; Mathematical models; Neutron diffraction; Residual stresses; Strain gages; Strain measurement; Fuselages
AbstractBoth experiments and finite element analysis were carried out to study the residual strain (stress) in the riveted lap joint for a better understanding of the fatigue life of fuselage lap joints. A force-controlled riveting process was used to apply a constant load ramp to install the rivets. Strain variations on the joint surface were measured using microstrain gauges during the riveting process. Because neutrons are known to penetrate through many centimeters of aluminum alloys, neutron diffraction was used to provide a nondestructive technique to determine strains at certain depths in the joint. Parallel to the experimental testing, a two-dimensional axisymmetric finite element model was developed to simulate the riveting process. Both material and geometric nonlinearities, as well as nonlinear contact boundary conditions, were used in this numerical model. Comparisons between the numerical simulations and experimental results focused on the rivet driven head deformations and strain variations, and the results showed that the current two-dimensional axisymmetric finite element model using the proper boundary conditions can reliably be used to determine the residual strains (stresses) present in joints that were induced during the riveting process.
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AffiliationNRC Institute for Aerospace Research; National Research Council Canada
Peer reviewedYes
NPARC number21275960
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Record identifierd0950c6c-17ce-45db-8dc0-72329c375a05
Record created2015-08-21
Record modified2016-05-09
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