Finite Element Analysis of Creep and Three Dimensional Fracture.
Final rept. 15 Mar 77-14 Oct 78,
MASSACHUSETTS INST OF TECH CAMBRIDGE AEROELASTIC AND STRUCTURES RESEARCH LAB
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Assumed stress hybrid finite element methods are developed for linear fracture analysis of three dimensional solids and for fracture of metals under high temperature creep conditions. For the 3-D fracture analysis a series of special elements with hexagonal shape have been derived. These elements include the asymptotic singular behavior at the crack tip front. For the fracture analysis of metals at high temperature, a method has been developed to analyze plane problems with growing cracks. From a comprehensive literature survey made for both analytical and experimental studies of crack growth under creep conditions, it is concluded that a possible numerical method is to incorporate the concept of damage parameter by Kachanov. Preliminary development in incorporating such parameter in the finite element creep analysis has been made. Author
- Theoretical Mathematics