ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In order to study the damage mechanism under different stress states of aluminum alloycomponents, two kinds of representative triaxial stress states were adopted, namely notch tensileand pure shear. The results of study showed: During the notch tensile test, stress triaxiality in theleast transverse-section was relatively higher. With increasing applied stress, the volume fraction ofthe microvoid in notch root was increasing constantly. When microvoid volume fraction reached thecritical value, the specimen fractured. During the pure shear test, stress triaxiality almost came up tozero, and there was almost no micro-void but localized shear bands within the specimen. The shearbands resulted from non-uniform deformation constantly under the shear stress. With stressconcentrating, the cracks were produced in the shear bands and later coalesced. When theequivalent plastic strain reached the critical value, the specimen fractured. The modified Gursondamage model and the Johnson-Cook model were used to simulate the notch tensile and shear testrespectively. Simulated engineering stress-strain curves fit the measured engineering stress-straincurves very well. In addition, the empirical damage evolution equation for the notch specimen wasobtained from the experiment data and FEM simulations
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1157.pdf
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