Invariant stress state parameters for forging upsetting of magnesium in the shell
OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 23 No. 1 2021 Conclusion Calculations of the stress-strain state show that the magnesium upsetting in the shell with the pressing tool is acting only to the end of the billet should lead to an increase in the plasticity of the metal, which was previously shown experimentally. An increase in the stress state index modulo by 2...5 times was revealed when comparing it with the stress state indicator for normal upsetting. Additionally, a zone with a Lode coef fi cient close to zero was identi fi ed. It is adjacent to the middle of the height of the billet at the point of contact with the shell and can be a dangerous cross-section in terms of crack formation. References 1. Kudiiarov V.N., Lider А . М ., Harchenko S.Y. Hydrogen accumulation in technically pure titanium alloy at satu- ration from gas atmosphere. Advanced Materials Research , 2014, vol. 880, pp. 68–73. DOI: 10.4028/www.scienti fi c. net/AMR.880.68. 2. Esmaily M., Svensson J.E., Fajardo S., Birbilis N., Frankel G.S., Virtanen S., Arrabal R., Thomas S., Johans- son L.G. Fundamentals and advances in magnesium alloy corrosion. Progress in Materials Science , 2017, vol. 89, pp. 92–193. DOI: 10.1016/j.pmatsci.2017.04.011. 3. Proust G. Processing magnesium at room temperature. Science , 2019, vol. 364 (6448), pp. 30–31. DOI: 10.1126/ science.aax9732. 4. Chang L.L., Wang Y.N., Zhao X., Huang J.C. Microstructure and mechanical properties in an AZ31 magne- sium alloy sheet fabricated by asymmetric hot extrusion. Materials Science and Engineering: A , 2008, vol. 496, iss. 1–2, pp. 512–516. DOI: 10.1016/j.msea.2008.06.015. 5. Loginov Yu.N., Kamenetsky B.I., Zamaraeva Yu.V. Mezhsloinoe vzaimodeistvie pri osadke bimetallicheskoi zagotovki [Interlayed interaction in the upsetting of the bimetallic billets]. Kuznechno-shtampovochnoe proizvodstvo. Obrabotka materialov davleniem = Forging and Stamping Production. Material Working by Pressure , 2019, no. 7, pp. 41–45. 6. Pan F., Wang Q., Jiang B., He J., Chai Y., Xu J. An effective approach called the composite extrusion to improve the mechanical properties of AZ31 magnesium alloy sheets. Materials Science and Engineering: A , 2016, vol. 655, pp. 339–345. DOI: 10.1016/j.msea.2015.12.098. 7. Khanawapee U., Butdee S. A study of barreling and DEFORM 3D simulation in cold upsetting of bi-material. Materials Today: Proceedings , 2020, vol. 26, pt. 2, pp. 1262–1270. DOI: 10.1016/j.matpr.2020.02.252. 8. Malcher L., Mamiya E.N. An improved damage evolution law based on continuum damage mechanics and its dependence on both stress triaxiality and the third invariant. International Journal of Plasticity , 2014, vol. 56, pp. 232–261. DOI: 10.1016/j.ijplas.2014.01.002. 9. Yoon J.W., Lou Y., Yoon J., Glazoff M.V. Asymmetric yield function based on the stress invariants for pressure sensitive metals. International Journal of Plasticity , 2014, vol. 56, pp. 184–202. DOI: 10.1016/j.ijplas.2013.11.008. 10. Driemeier L., Micheli G., Alves M., Brünig M. Experiments on stress-triaxiality dependence of material behavior of aluminum alloys. Mechanics of Materials , 2010, vol. 42, iss. 2, pp. 207–217. DOI: 10.1016/j. mechmat.2009.11.012. 11. Xiao X., Mu Z., Pan H., LouY. Effect of the lode parameter in predicting shear cracking of 2024-t351 aluminum alloy Taylor rods. International Journal of Impact Engineering , 2018, vol. 120, pp. 185–201. DOI: 10.1016/j. ijimpeng.2018.06.008. 12. Mirone G., Corallo D. A local viewpoint for evaluating the in fl uence of stress triaxiality and lode angle on ductile failure and hardening. International Journal of Plasticity , 2010, vol. 26, iss. 3, pp. 348–371. DOI: 10.1016/j. ijplas.2009.07.006. 13. Kamenetsky B.I., Loginov Yu.N., VolkovA.Yu. Metody i ustroistva dlya povysheniya plastichnosti khrupkikh materialov pri kholodnoi osadke s bokovym podporom [Methods and apparatus for increase of brittle materials plasticity under cold upsetting with lateral support]. Zagotovitel’nye proizvodstva v mashinostroenii = Blanking productions in mechanical engineering , 2013, no. 9, pp. 15–22. 14. Volkov A.Yu., Antonova O.V., Kamenetskii B.I., Klyukin I.V., Komkova D.A., Antonov B.D. Poluchenie, struktura, tekstura i mekhanicheskie svoistva sil’no deformirovannykh obraztsov magniya [Production, structure,
Made with FlippingBook
RkJQdWJsaXNoZXIy MTk0ODM1