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:
Experiments show that the failure of ductile materials can be characterized by arate-independent parameter, relative spacing d defined as the ratio of the distance between two voids andthe radius of voids. In this study, this experimental phenomenon is analyzed via numerical simulationsusing 3-D finite element model. Considering that hydrostatic stress is a dominant factor in the evolutionof microvoid nucleation, growth and coalescence in ductile materials, numerical simulations areperformed to obtain the relationship between relative spacing d and hydrostatic stress in the ligamentbetween voids. Numerical results show that hydrostatic stress along matrix ligament is sensitive to thechange of the relative spacing. Further analysis shows that the failure of ductile materials can modeled byusing a criterion of the threshold of local hydrostatic stress in the ligament. Based on such a criterion, acurve displaying the relationship between the strength of ductile material and strain rate is obtainednumerically. It is concluded that the failure criterion of ductile materials can be described by using localhydrostatic stress and relative spacing between two voids, which is not sensitive to strain rates
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.483.pdf
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