1. NAFEMS seminar, 31 May - 1 June 2006
ON THE MORE RELIABLE INTRODUCTION OF THE RESIDUAL STRESSES IN THE THERMO-MECHANICAL ANALYSIS OF LAYERED STRUCTURES
DUBRAVKA MIJUCA
Faculty of Mathematics
University of Belgrade
Serbia
ac.yu
NAFEMS seminar, 31 May - 1 June 2006
Prediction and Modelling of Failure Using FEA

2. Contour method
Example
CAD
Hypothetical example
The blade is of glass fibre/epoxy matrix pre-pregs
The gear box is made of fibre/epoxy
The adhesive is made of epoxy
External load - gravitational

3. Mijuca Dubravka, Finite element FEMIX HC EL
Example
CAD
Syy results
Mijuca Dubravka, Finite element FEMIX HC EL

4. Mijuca Dubravka, Finite element FEMIX HC EL
Syy results
+Residual stresses
Delamination
Mijuca Dubravka, Finite element FEMIX HC EL
Debonding
Crack

5. Mijuca Dubravka, Finite element FEMIX HC EL
Syy results
+Residual stresses
Rotor blade
Gravitational Load
Mijuca Dubravka, Finite element FEMIX HC EL
Gravitational Load and residual stress 1E6MPa

6. Mijuca Dubravka, Finite element FEMIX HC EL
+Residual stresses
Rotor blade
Pressure load from CFD
Mijuca Dubravka, Finite element FEMIX HC EL

7. Mijuca Dubravka, Finite element FEMIX HC EL
+Residual stresses
Rotor blade
Pressure load from CFD
Mijuca Dubravka, Finite element FEMIX HC EL
18789 dof’s per displacement vector and stress tensor
76.36 sec on the notebook 1.4GHz Intel Pentium (R) 512MB RAM

8. Mijuca Dubravka, Finite element FEMIX HC EL
Rotor blade
Pressure load from CFD
Conclusion
Pressure load on the upper side
Mijuca Dubravka, Finite element FEMIX HC EL

9. Reliable FEA consultancy and design
Pressure load from CFD
Conclusion
Thank you
The reliable fully three-dimensional reliable primal-mixed approach is recommended for the use in the analysis of layered structures where residual stresses should be taken in the account
Reliable FEA consultancy and design