A new low cycle fatigue lifetime prediction model for magnesium alloy based on modified plastic strain energy approach
Subject Areas : Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
محمد آزادی
1
(
دکتری، کارگروه خستگی و سایش در مواد، شرکت تحقیق، طراحی و تولید موتور ایران خودرو (ایپکو)، تهران، ایران
)
غلامحسین فرهی
2
(
استاد، آزمایشگاه تخمین و بهبود مواد، دانشکده مکانیک، دانشگاه صنعتی شریف، تهران، ایران
)
Keywords: low cycle fatigue, cylinder head, fatigue lifetime prediction model, Magnesium alloy, energy approach,
Abstract :
Nowadays, the technology intends to use materials such as magnesium alloys due to their high strength to weight ratio in engine components. As usual, engine cylinder heads and blocks has made of various types of cast irons and aluminum alloys. However, magnesium alloys has physical and mechanical properties near to aluminum alloys and reduce the weight up to 40 percents. In this article, a new low cycle fatigue lifetime prediction model is presented for a magnesium alloy based on energy approach and to obtain this objective, the results of low cycle fatigue tests on magnesium specimens are used. The presented model has lower material constants in comparison to other criteria and also has proper accuracy; because in energy approaches, a plastic work-lifetime relation is used where the plastic work is the multiple of stress and plastic strain. According to cyclic softening behaviors of magnesium and aluminum alloys, plastic strain energy can be proper selection, because of being constant the product value of stress and plastic strain during fatigue loadings. In addition, the effect of mean stress is applied to the low cycle fatigue lifetime prediction model by using a correction factor. The results of presented models show proper conformation to experimental results.
[1] Tharumarajah A., Koltun P., Is there an environmental advantage of using magnesium components for light-weighting cars?, Journal of Cleaner Production, Vol. 15, 2007, pp. 1007-1013.
[2] Okamoto Y., Kinoshita K., Tanizawa M., Yoshida K., Magnesium alloy for casting and magnesium-alloy cast product, United States Patent Application Publication, No. US 2010/0119405-A1, 2010.
[3] Park H.M., Magnesium alloy engine block, United States Patent Application Publication, No. US 2010/0050977-A1, 2010.
[4] Eisenmeier G., Holzwarth B., Hoeppel H.W., Mughrabi H., Cyclic deformation and fatigue behaviour of the magnesium alloy AZ91, Materials Science and Engineering, Vol. 319-321, 2001, pp. 578-582.
[5] Pekguleryuz M.O., Kaya A.A., Creep resistant magnesium alloys for powertrain applications, Proceedings of the 6th International Conference Magnesium Alloys and Their Applications, Wolfsburg, Germany, 2004.
[6] Hasegawa S., Tsuchida Y., Yano H., Matsui M., Evaluation of low cycle fatigue life in AZ31 magnesium alloy, International Journal of Fatigue, Vol. 29, 2007, pp. 1839-1845.
[7] Xue Y., Horstemeyer M.F., McDowell D.L., Kadiri H.E., Fan J., Microstructure-based multistage fatigue modeling of a cast AE44 magnesium alloy, International Journal of Fatigue, Vol. 29, 2007, pp. 666-676.
[8] Begum S., Chen D.L., Xu S., Luo A.A., Low cycle fatigue properties of an extruded AZ31 magnesium alloy, International Journal of Fatigue, Vol. 31, 2009, pp. 726-735.
[9] Beguma S., Chen D.L., Xu S., Luoc A.A., Effect of strain ratio and strain rate on low cycle fatigue behavior of AZ31 wrought magnesium alloy, Materials Science and Engineering, Vol. 517, 2009, pp. 334-343.
[10] Park S.H., Hong S.G., Lee B.H., Bang W., Lee C.S., Low-cycle fatigue characteristics of rolled Mg-3Al-1Zn alloy, International Journal of Fatigue, Vol. 32, 2010, pp. 1835-1842.
[11] Kwon S., Song K., Shin K.S., Kwun S.I., Low cycle fatigue properties and cyclic deformation behavior of as-extruded AZ31 magnesium alloy, Transactions of Nonferrous Metals Society of China, Vol. 20, 2010, pp. 533-539.
[12] Li Q., Yu Q., Zhang J., Jiang Y., Effect of strain amplitude on tension–compression fatigue behavior of extruded Mg6Al1ZnA magnesium alloy, Scripta Materialia, Vol. 62, 2010, pp. 778-781.
[13] Li Q., Yu Q., Zhang J., Jiang Y., Multiaxial fatigue of extruded AZ61A magnesium alloy, International Journal of Fatigue, Vol. 33, 2011, pp. 437-447.
[14] Gocmez T., Awarke A., Pischinger S., A new low cycle fatigue criterion for isothermal and out-of-phase thermo-mechanical loading, International Journal of Fatigue, Vol. 32, 2010, pp. 769-779.
[15] Trampert S., Gocmez T., Pischinger S., Thermo-mechanical fatigue life prediction of cylinder heads in combustion engines, Journal of Engineering for Gas Turbines and Power, Vol. 130, 2008, pp. 1-10.
[16] Lagoda T., Energy models for fatigue life estimation under uniaxial random loading, Part I: The model elaboration, International Journal of Fatigue, Vol. 23, 2001, pp. 467-480.
[17] Minichmayr R., Riedler M., Winter G., Leitner H., Eichlseder W., Thermo-mechanical fatigue life assessment of aluminium components using the damage rate model of Sehitoglu, International Journal of Fatigue, Vol. 30, 2008, pp. 298-304.
[18] Minichmayr R., Riedler M., Eichlseder W., Fatigue analysis of aluminum components using the damage rate model of Neu/Sehitoglu, International Workshop on Thermo-Mechanical Fatigue, Berlin, Germany, 2005.
[19] Riedler M., Winter G., Minichmayr R., Eichlseder W., Applicability of plastic and total hysterias energy criterions for simulating the TMF lifetime, International Workshop on Thermo-Mechanical Fatigue, Berlin, Germany, 2005.
[20] Song G., Hyun J., Ha J., Creep-fatigue life prediction of aged 13CrMo44 steel using the tensile plastic strain energy, Temperature-Fatigue Interaction, edited by L. Remy and J. Petit, Elsevier Science Ltd. and ESIS, 2002.
[21] Farrahi G.H., Azadi M., Winter G., Eichlseder W., A new energy-based isothermal and thermo-mechanical fatigue lifetime prediction model for aluminum-silicon-magnesium alloy, Fatigue and Fracture of Engineering Materials and Structures, 2013, DOI: 10.1111/ffe.12078.