Title: Identification of stiffness and damping properties of composites from full field measurements Theory and simulations
1Identification of stiffness and damping
properties of composites from full field
measurementsTheory and simulations
CompTest
2003
- A. Giraudeau, F. Pierron
- L.M.P.F. (JE 2381)
- ENSAM Châlons en Champagne
2Scheme
1. Introduction
2. Presentation of the method
3. Virtual Fields
4. Application
5. Simulation Validation
6. Conclusion
3 Introduction
Prediction of vibrating behaviour
- Damping
Identification Experimental Modal Analysis
Anisotropic materials
Isotropic material
Anisotropic material
4 Presentation of the method
- Application of the Principle of Virtual Works
5 Excitation set up
6 Full field measurements
- fields of out of plane slopes
- no contact
Examples Speckle Interferometry measurements
7 Principle of Virtual Works
Virtual works
(Elastic) (Dissipative)
(Clamping)
(Acceleration)
8Actual fields of displacements
9 F. E. Simulation
Isotropic and viscoelastic material
Model
2048 shell elements
10 Actual fields of displacements
- Absolute response in complex notation
11 Choice of the Virtuals Fields
Actual fields
Virtual fields
12 Virtual works of external forces (VWEF)
13 Virtual works of internal forces (VWIF)
- Thin plate Love Kirchoff theory
- Isotropic viscoelastic material
14 Virtual works of inertial forces (VWIF)
15 Summary
VWIF VWEF VWAC
Virtual Works Principle
16 Identification
17 Simulation
Isotropic material
Proportional damping b
2048 shell elements
18 Simulation Results (1)
Excitation at resonances
19 Simulation Results (2)
Excitation at resonances
20 Simulation Results (3)
21 Conclusion
- Simultaneous identification of stiffness and
damping
- Resonant or non resonant response
- Excitation on a range of frequencies