Effect of Interference on the Mechanics of Load Transfer in Aircraft Fuselage Lap Joints

Much of the fatigue damage in aircraft structures can be linked to the stress concentration arising at the rivet/skin interface in fuselage lap-joints. Fatigue damage can degrade the strength of the structure and reduce structural integrity. The stress distribution around the rivet holes, which depends on several loading conditions, is therefore of prime importance. Critical manufacturing process variations must be taken into account to observe the effect on local stresses at the hole. This paper presents three-dimensional (3D) nonlinear finite element analyses to investigate the stress state at rivet holes in fuselage lap joints. Initially, a 3D single rivet model of the riveting process was developed to characterize the unsymmetric residual stress distribution resulting from rivet installation. Then a global three-rivet model of the fuselage lap-joint, which takes into account the residual stresses from rivet installation and fuselage pressurization, was analyzed and compared to observations available from teardown inspection. The models were then implemented to observe the effects of rivet interference, sealant, and drill shavings on the stress state. A multiaxial fatigue criterion was implemented to predict cycles to crack nucleation for the modeled parameters. The effect of underdriven rivets and sealant were observed to be the most critical on the stress state of the fuselage splice. Excellent comparison with the damage characterization of the fuselage lap-joint provides validation to the finite element model.

[1]  K. N. Smith.  A Stress-Strain Function for the Fatigue of Metals , 1970 .

[2]  J M Potter,et al.  Use of Small Crack Data to Bring about and Quantify Improvements to Aircraft Structural Integrity. , 1983 .

[3]  D. Y. Wang.  A Study of Small Crack Growth under Transport Spectrum Loading , 1983 .

[4]  Darrell F. Socie,et al.  Multiaxial Fatigue Damage Models , 1987 .

[5]  N. Demina,et al.  The influence of the interference of a rivet on the mechanical properties of D16 alloy sheet in biaxial tension , 1989 .

[6]  J Smart,et al.  An Experimental and Numerical Analysis of Riveted Single Lap Joints , 1994 .

[7]  Jerome B. Cohen,et al.  Residual stresses in and around rivets in clad aluminum alloy plates , 1994 .

[8]  Kosuke Haraga,et al.  Fatigue Strength of Adhesive/Rivet Combined Lap Joints , 1995 .

[9]  T. Ryzhova,et al.  Estimation of the reliability of ultrasonic quality control of riveted joints with clearance , 1995 .

[10]  T. Ryzhova,et al.  Ultrasonic assessment of the radial clearance of riveted joints in aircraft structures , 1995 .

[11]  Susan Pitt,et al.  MULTIPLE-SITE AND WIDESPREAD FATIGUE DAMAGE IN AGING AIRCRAFT , 1997 .

[12]  Thomas Farris,et al.  Modeling of skin/rivet contact: Application to fretting fatigue , 1997 .

[13]  K. Iyer,et al.  Three-dimensional finite element analyses of the local mechanical behavior of riveted lap joints , 1997 .

[14]  J Smart,et al.  Riveted single lap joints. Part 1: A numerical parametric study , 1997 .

[15]  John W. Hutchinson,et al.  The clamping stress in a cold-driven rivet , 1998 .

[16]  Thomas Farris,et al.  Shell Modeling of Fretting in Riveted Lap Joints , 1998 .

[17]  James C. Newman,et al.  A Practical Engineering Approach to Predicting Fatigue Crack Growth in Riveted Lap Joints , 1999 .

[18]  T. N. Farris,et al.  Integrated approach for prediction of fretting crack nucleation in riveted lap joints , 1999 .

[19]  Thomas Farris,et al.  Linking Riveting Process Parameters to the Fatigue Performance of Riveted Aircraft Structures , 2000 .

[20]  L. F. Silva,et al.  Multiple-site damage in riveted lap-joints: experimental simulation and finite element prediction , 2000 .

[21]  J. Monaghan,et al.  Failure mechanism of riveted joint in fibre metal laminates , 2000 .

[22]  Toshiyuki Sawa,et al.  Stress analysis and strength evaluation of single-lap adhesive joints combined with rivets under external bending moments , 2001 .

[23]  Gang Li,et al.  Finite element and experimental studies on single-lap balanced joints in tension , 2001 .

[24]  Min Liao,et al.  Analytical methodology for predicting fatigue life distribution of fuselage splices , 2001 .

[25]  Carol A. Rubin,et al.  Analysis of the Effects of Thin Sealant Layers in Aircraft Structural Joints , 2003 .

[26]  Gang Li,et al.  Effect of the Riveting Process on the Residual Stress in Fuselage Lap Joints , 2004 .

[27]  Ws Johnson,et al.  3D FEA Simulations to Assess Residual Stresses in Riveting Processes , 2006 .