PSI - Issue 13

N.V. Boychenko / Procedia Structural Integrity 13 (2018) 908–913

913

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Boychenko N.V. / Structural Integrity Procedia 00 (2018) 000–000

Material properties have significant influence on the distribution of the plastic stress intensity factor. In specimens of the same geometry with the same loading type, the values of the plastic stress intensity factor for aluminum alloy V95 are approximately 2 times higher than for D16T. The Plastic SIF as a function of temperature has a wider range in alloy B95 than in D16T. The effect of loading type on K p at the deepest point of the crack front (Figure 5) is generally insignificant in the considered temperature range. The presented data clearly illustrates the effect of loading conditions and geometry as well as material properties and temperature on the plastic stress intensity factor. It should be noted that the material properties and temperature have a significant influence on K p . Thus, the fundamental difference and advantage of the plastic SIF is the sensitivity to the temperature and real plastic properties of the material. Conclusions Elastic and plastic SIFs numerically obtained under uniaxial tension and bending in temperature range were studied. The limitations of the elastic stress intensity factor are established and the wide possibilities of an elastic-plastic SIF were shown. The principal difference between the plastic and elastic stress intensity factors is the sensitivity to the real plastic properties of the material and the temperature. The material properties and temperature have the most significant effect on the plastic stress intensity factor of all the factors considered in the work, such as the crack size and position, the loading type, the material properties and the test temperature. The plastic SIF K p , which is shown to be sensitive to elastic-plastic material properties of the specimens, offers an attractive option as a self-dependent parameter for use in characterizing the fracture resistance properties of a material. References Tada, H., Paris, P., Irwin, G.R., 1973. The stress analysis of cracks. Handbook Hellertown: Del Res.Corp., 385p. Sih, G.C.,1973. Handbook of stress-intensity factors vol 1., Bethlehem: Lehigh Univ. Press, 420p. Sih, G.C.,1974. Handbook of stress-intensity factors vol 2., Bethlehem: Lehigh Univ. Press, 406p. Murakami, Y. (ed.), 1987. Stress Intensity Factors Handbook. In 2 Volumes. Oxford etc., Pergamon press, 1456 p. Shlyannikov, V.N., Tumanov, A.V., 2014. Characterization of crack tip stress fields in test specimens using mode mixity parameters. International Journal of Fracture 185, 49-76. (a) Shlyannikov, V.N., Boychenko, N.V., Tumanov, A.V., Fernandez-Canteli, A., 2014. The elastic and plastic constraint parameters for three dimensional problems. Engineering Fracture Mechanics 127, 83–96. (b) Shlyannikov, V.N., Zakharov, A.P., 2014. Multiaxial crack growth rate under variable T-stress. Engineering Fracture Mechanics 123, 86–99. (c) ANSYS mechanical APDL theory reference release 14.5. 2012. ANSYS, Inc., Southpointe, 275 Technology Drive, CanonBurg, PA. Boychenko, N.V., 2017. Elastic and plastic stress intensity factors in specimens of aluminum alloys under tensile and bending loading. Transactions of Academenergo 3, 66-78. (a) Boychenko, N.V., 2017. Elastic and plastic fracture resistance parameters in specimens of aluminum alloys at low temperature. Transactions of Academenergo 4, 89-99. (b) Boychenko, N.V., 2018. Elastic and plastic stress intensity factors in specimens of aluminum alloys under various loading conditions at temperature range. Transactions of Academenergo 2, 68-79.