Evaluating the Effects of Overload and Welding Residual Stress in Fatigue Crack Propagation
محورهای موضوعی : Mechanical Engineering
Ali Moarefzadeh
1
(Islamic Azad university, Ahvaz Branch)
Shahram Shahrooi
2
(Islamic Azad university, Ahvaz Branch)
Mehdi Jalali Azizpour
3
(Islamic Azad university, Ahvaz Branch)
کلید واژه: Weight Function, Stress intensity factor, Fatigue Crack Propagation, Residual stress,
چکیده مقاله :
In this paper, a suitable method is presented to predicate fatigue crack propagation for cyclic loading with overload in residual stresses field resulted by weld. For this, first effective stress intensity factor (SIF) and effective cycle ratio (R) are introduced as function depending on SIFs resulted by external load, weld residual stress and overload. Weight function is applied to calculate SIF resulted by weld residual stress. Also, a method is introduced to determine overload SIF and overload stress ratio. Then fatigue crack propagation equation is modified for our purpose. In other words, a simple and efficient method is presented in this paper for predicting fatigue crack propagation rate in welded joints when the overload is happen. Finally for evaluating this modified equation, experimental methods are applied. Test samples were M(T) geometry made of aluminum alloy with a longitudinal weld by the Gas Tungsten arc welding process. Modified equation has a good agreement with the experimental model presented in this field.
[1] Bayley, C., Glinka, G., and Porter, J., Fatigue Crack Initiation and Growth in A517 Submerged Arc Welds under Variable Amplitude Loading, International Journal of Fatigue, Vol. 22, No. 9, 2000, pp. 799-808.
[2] Itoh, Y. Z., Suruga, S., and Kashiwaya, H., Prediction of Fatigue Crack Growth Rate in Welding Residual Stress Fields, Engineering Fracture Mechanics, Vol. 33, No. 3, 1989, pp. 397-407
[3] Chong, Rhee, H., Fatigue Crack Growth Analysis of Offshore Structural Tubular Joints, Engineering Fracture Mechanics, Vol. 34, No. 5, 1989, pp. 1231-1239.
[4] Wu, X. R., Carlsson, J., Welding Residual Stress Intensity Factors for Half-Elliptical Surface Cracks in thin and thick Plates, Engineering Fracture Mechanics, Vol. 19, No. 3, 1984, pp. 407-426.
[5] Wu, X. R., The Effect of Welding Residual Stress on Brittle Fracture of Plates with Surface Cracks, Engineering Fracture Mechanics, Vol. 19, No. 3, 1984, pp. 427-439.
[6] Liljedahl, C. D. M., Tan, M. L., Zanellato, O., Ganguly, S., Fitzpatrick, M. E., and Edwards, L., Evolution of Residual Stresses with Fatigue Loading and Subsequent Crack Growth in a Welded Aluminum Alloy Middle Tension Specimen, Engineering Fracture Mechanics, Vol. 75, No. 1, 2008, pp. 3881–3894.
[7] Bussu, G., Irving, P. E., The Role of Residual Stress and Heat Affected Zone Properties on Fatigue Crack Propagation in Friction Stir Welded 2024-T351 Aluminum Joints, International Journal of Fatigue, Vol. 25, No. 1, 2003, pp. 77–88.
[8] Edwards, L., Fitzpatrick M. E., Irving, P. E., Sinclair, I., Zhang, X., and Yapp, D., An Integrated Approach to the Determination and Consequences of Residual Stress on the Fatigue Performance of Welded Aircraft Structures, ASTM International, Vol. 3, No. 2, 2006, pp. 1-17.
[9] Teng, T. L., Chang, P. H., Effect of Residual Stresses on Fatigue Crack Initiation Life for Butt-Welded Joints, International Journal of Material Process, Vol. 145, No. 3, 2004, pp. 325-335.
[10] Varghese, V. M., Sumanth, M. R., and Suresh, M. R., Numerical Simulation of Residual Stress in a Spot Welded Low Carbon Steel Plate, Procedia Engineering, Vol. 38, No. 1, 2012, pp. 2913 – 2921.
[11] Jones, K. W., Dunn, M. L., Predicting Corner Crack Fatigue Propagation from Cold Worked Holes [J], Engineering Fracture Mechanics, Vol. 76, No. 13, 2009, pp.2074–2090.
[12] Elber, W., Fatigue Crack Closure Under Cyclic Tensio, Engineering Fracture Mechanics, Vol. 2, No. 1, 1970, pp. 37–44.
[13] Kumar, R., Kumar, A., and Kumar, S0., Delay Effect in Fatigue Crack Propagation, International Journal of Pressure Vessels and Piping, Vol. 67, No. 1, 1996, pp. 1-5.
[14] Borresgo, L. P., Ferreira, J. M., Cruz, J. M., and Costa, J. M., Evaluation of Overload Effects on Fatigue Crack Growth and Closure, Engineering Fracture Mechanics, Vol. 70, No. 11, 2003, pp. 1379-1397.
[15] Shuter, D. M., Geary, W., Some Aspects of Fatigue Crack Growth Retardation Behavior Following Tensile Overloads in a Structural Steel, Fatigue and Fracture of Engineering Material and Structures, Vol. 19, No. 2, 1996, pp. 185- 199.
[16] Tur, Y. K., Vardar, O., Periodic Tensile Overloads in 2024-T3 Al-alloy, Engineering Fracture Mechanics, Vol. 53, No. 1, 1996, pp. 69-77.
[17] Broek, D., Elementary Engineering Fracture Mechanics, Kluwer Academic Publishers Group, 1982.
