Fatigue Life Prediction of Rivet Joints
الموضوعات :
1 - Research Institute of Petroleum Industry, Islamic Republic of, Tehran, Iran
الکلمات المفتاحية: Fracture, Riveted joints, Life prediction, Fatigue,
ملخص المقالة :
Strength reduction in structures like an aircraft could be resulted as cyclic loads over a period of time and is an important factor for structural life prediction. Service loads are emphasized at the regions of stress concentration, mostly at the connection of components. The initial flaw prompting the service life was expected by using the Equivalent Initial Flaw Size (EIFS) which has been recognized as a powerful design tool for life prediction of engineering structures. This method was introduced 30 years ago in an attempt to study the initial quality of structural details. In this paper, the prediction of life based on failure mechanics in a riveted joint has been addressed through the concept of EIFS. For estimation of initial crack length by EIFS, extrapolation method has been used. The EIFS value is estimated using the coefficient of cyclic intensity (ΔK) and using the cyclic integral (ΔJ), and the results are compared with each other. The simulation results show that the if the coefficient of tension been used in EIFS estimation, which based on the Paris law, the EIFS value will be dependent on the loading domain, while the use of the J-Cyclic integral in the EIFS decrease its dependence on the load domain dramatically.
[1] Newman J.C., Phillips E.P., Swain M.H., 1999, Fatigue-life prediction methodology using small-crack theory, International Journal of Fatigue 21: 109-119.
[2] Lim J.-Y., Hong S.-G., Lee S.-B., 2005, Application of local stress–strain approaches in the prediction of fatigue crack initiation life for cyclically non-stabilized and non-Masing steel, International Journal of Fatigue 27: 1653-1660.
[3] Pugno N., Ciavarella M., Cornetti P., Carpinteri A., 2006, A generalized Paris’ law for fatigue crack growth, Journal of the Mechanics and Physics of Solids 54: 1333-1349.
[4] Kim S.T., Tadjiev D., Yang H.T., 2006, Fatigue life prediction under random loading conditions in 7475-T7351 aluminum alloy using the RMS model, International Journal of Damage Mechanics 15: 89-102.
[5] Dowling Norman E., 1999, Mechanical Behavior of Materials, Prentice-Hall, New Jersey.
[6] Newman J.C.Jr., 1998, The merging of fatigue and fracture mechanics concepts, Progress in Aerospace Sciences 34: 347-390.
[7] Liu Y., Mahadovan S., 2009, Probabilistic fatigue life prediction using an equivalent initial flaw size distribution, International Journal of Fatigue 31(3): 476-487.
[8] Amanullah M., Siddiqui N.A., Umar A., Abbas H., 2002, Fatigue reliability analysis of welded joints of a TLP tether system, Steel & Composite Structures 2(5): 331-354.
[9] Kim J., Zi G., Van S., Jeong M., Kong J., Kim M., 2011, Fatigue life prediction of multiple site damage based on probabilistic equivalent initial flaw model, Structural Engineering and Mechanics 38(4): 443-457.
[10] Shahani A. R., Moayeri Kashani H., 2013, Assessment of equivalent initial flaw size estimation methods in fatigue life prediction using compact tension specimen tests, Engineering Fracture Mechanics 99: 48-61.
[11] Suna J., Dinga Z., Huang Q., 2019, Development of EIFS-based corrosion fatigue life prediction approach for corroded RC beams, Engineering Fracture Mechanics 209: 1-16.
[12] Gallagher J.P., Molent L., 2015, The equivalence of EPS and EIFS based on the same crack growth life data, International Journal of Fatigue 80: 162-170.
[13] Newman J.C.Jr., 1981, A crack closure model for predicting fatigue crack-growth under aircraft spectrum loading, NASA Technical Memorandum 81941: 53-84.
[14] Molent L., SUN Q., Green A.J., 2006, Characterisation of equivalent initial flaw sizes in 7050 aluminium alloy, Fatigue & Fracture of Engineering Materials & Structures 29: 916-937.
[15] Yongming Liu, Sankaran Mahadevan, 2009, Probabilistic fatigue life prediction using an equivalent initial flaw size distribution, International Journal of Fatigue 31: 476-487.
[16] Moreira P., Matos P., Camanho P., Pastrama P., Castro P., 2007, Stress intensity factor and load transfer analysis of a cracked riveted lap joint, Materials and Design 28(4): 1263-1270.
