Residual life predictions of corroded fuselage lap joints

Numerical Simulation of Corrosion Fatigue Crack Propagation

“…Before the AFGROW simulation procedure, the effect of corrosion was converted to the magnitude factor of loading stress equivalently [6]. Based on the Paris parameter values in air and 3.5%NaCl solution listed in Table1, the ratio of K values in two different environments can be calculated.…”

Influence of morphology of corrosion on fracture initiation in an aluminum alloy

“…Information related to the morphology of damage during corrosion of an aluminum alloy structure that is used in an aircraft is both important and desirable. This is primary because it directly reflects upon the residual strength and remaining life, or residual life, of the concerned aluminum alloy structure [8,9]. Based on a careful study of existing experimental results, documented in the published literature, it is clear that the fatigue cracks initiating and growing from corrosion-induced pits eventually culminate in failure by fracture of the laboratory-size test specimen or real-world structure.…”

Effects of Clearance Fit and Friction Coefficient on Triple-Row Riveted Lap Joints

“…1,6,7 Test results have shown that a certain degree of scatter is present in the fatigue life for the riveted lap joints under the same loading condition. 9,10 The causes of this scatter could be attributed to differences in the clearance fit between the rivet and the fastener hole edge, knife edge hole conditions caused by the countersunk depth in the outer sheet, corrosion pillowing between overlap regions, fastener hole conditions, scatter in the material property, riveting condition, etc. By properly selecting the rivet size, a knife-edge hole can be avoided.…”

“…Insightful results about the stress condition were obtained. [10][11][12][13][14] Then, a project was initiated to develop numerical modeling and methodologies to study the riveting process and its effect on riveted lap joints. Effects of the riveting process on the residual stress/strain in joints were studied experimentally and numerically.…”

“…The material elastoplastic constitutive relationship and geometric non-linear properties, as well as nonlinear contact boundary conditions, were included in the numerical models. [16][17][18][19] A literature review [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] showed that there was little quantitative study available on the effect of the clearance fit and friction coefficient on the stress/strain variation in triple-row countersunk riveted lap joints. Furthermore, an accurate numerical analysis of the corrosion pillowing effect on the stress state in lap joints is also needed.…”