Waldbjørn, Jacob Paamand3; Høgh, Jacob Herold3; Stang, Henrik1; Berggreen, Christian8; Schmidt, Jacob Wittrup1; Branner, Kim6
1 Department of Civil Engineering, Technical University of Denmark2 Section for Structural Engineering, Department of Civil Engineering, Technical University of Denmark3 Department of Mechanical Engineering, Technical University of Denmark4 Solid Mechanics, Department of Mechanical Engineering, Technical University of Denmark5 Section for Building Design, Department of Civil Engineering, Technical University of Denmark6 Department of Wind Energy, Technical University of Denmark7 Wind Turbines, Department of Wind Energy, Technical University of Denmark8 Centre for oil and gas – DTU, Center, Technical University of Denmark
Hybrid testing is a substructuring technique where a structure is emulated by modelling a part of it in a numerical model while testing the remainder experimentally. Previous research in hybrid testing has been performed on multi-component structures e.g. damping fixtures, however in this paper a hybrid testing platform is introduced for single-component hybrid testing. In this case, the boundary between the numerical model and experimental setup is defined by multiple Degrees-Of-Freedoms (DOFs) which highly complicate the transferring of response between the two substructures. Digital Image Correlation (DIC) is therefore implemented for displacement control of the experimental setup. The hybrid testing setup was verified on a multicomponent structure consisting of a beam loaded in three point bending and a numerical structure of a frame. Furthermore, the stability of the hybrid testing loop was investigated for different ratios of stiffness between the numerical model and test specimen. It was found that when deformations were transferred from the numerical model to the experimental setup, the hybrid test was only stable when the stiffness of the numerical model was higher than the test specimen. The hybrid test gave similar results as a numerical simulation of the full structure. The deviation between the two was primarily due to the response of the specimen in the hybrid test being one load step behind the numerical model.
Proceedings of the 19th International Conference on Composite Materials, 2013
Hybrid testing; Hardware-in-the-loop; Substructural testing; Composites; Three point bending; Finite element modelling, high-precision control
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19th International Conference on Composite Materials, 2013