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Fatigue lifetime of 20MnV6 steel with holes manufactured by various methods

,9, 715. M iková , K. et al . 2013. Int. J. of Fatigue, 55, 33. S kočovský , P. et al . 2014. Náuka o materiáli. EDIS ŽU v Žiline. (in Slovak). T rško , L. et al . 2014. Dynamic Stength and Fatigue Lifetime, EDIS ŽU v Žiline. T rško , L. et al . 2014. Materials & Design, 57, 103. T rško , L. et al . 2017. J. of Mat. Eng. and Performance, 26, 6, 2784. U lewicz , R. M azur , M. Production Engineering Archives, No.1, 32.

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Evaluation of Tooth No. 2674 and ESCO Tooth 3D models

a Bucket tooth and its Service Life. In Management Systems in Production Engineering, pp. 12-18, ISSN 2083-5280 Gondek, H.: (2007), Teoretický rozbor rozpojování hornin s ohledem na dosud existující teorie rozpojování a pevnostní chování a aspekty vzájemného působení hornin na dobývací orgán, Opava. Moni, V., Helebrant, F., Chytka, L.: (2011), Influence of wheel bucket tooth thermal image on its life-time. In International Multidisciplinary Scientific GeoConference SGEM 2011, Conference Centre Flamengo Grand Albena, Bulharsko, s. 899-906, ISSN 1314

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The Vision of Students Enrolled in European Technical Universities Regarding Tomorrow’S World

References Duşe, C. S., Duşe, D., Nemeş, C., (2010), Leadership in Classical Universities: between an Entrepreneurial and Virtual World, 6th European Conference on Management, Leadership and Governance, Wroclaw, Polonia Maxwell, J. (2008) Leadership Gold. Lessons I`ve learned from a lifetime of leading., Gardners Books Rendell, M. (2007) Managing tomorrow’s people.The future of work to 2020, PricewaterhouseCoopers LLP. Senge, P. (2006) The fifth Discipline, Second edition, Copyrightmaterial

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Spreading of Cracks Due to Thermal Fatigue in Metal Molds

Abstract

The article deals with the formation and spread of cracks from thermal fatigue in metallic forms. For a detailed examination of the problem, it is necessary to describe the thermal side of the process and the mechanism of mechanical stressing of the material. For the heating of the material is valid where the thermal diffusivity of the material is exercised by the decision method. The stress of the material by heating from the die casting metal depends mainly on the physical properties of the material when the calculated stress does not exceed the yield point. Also, with the help of dislocations write the life to the origin of the cracks in the cycles eventually the share of this lifetime on the total lifetime in dependence on the mechanical and physical properties of the material. During operation tests the occurrence of the cracks on the mold surface was initiated by the inclusion or concentration of stress in the knurling effect of fine grooves after grinding. Other cracks occurred in the undersurface layer and their direction was statistically accidental.

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