Abstract
Understanding the nonlinear dynamical contact interactions within joints is crucial for understanding and predicting the dynamics of assembled structures. In spite of this, most experimental investigations focused on the global vibration behavior, since the local interactions at the interface cannot be observed with standard techniques. In the present work, an advance contact pressure measurement system is used in a unique way to analyze, in situ, the interfacial contact pressures and the contact area inside a bolted lap joint connecting two beams (Brake-Reuß beam). An important feature of the measurement system is that it is designed for frequency ranges including the typical vibration frequency of the Brake-Reuß beam’s first eigenmode, and thus permits measurement under dynamic excitation. The dynamics of the contact pressures were investigated with different bolt torque levels and with different excitation levels. The experiments found that significant variations of the contact state occurred and that the contact pressure measurement system could adequately resolve this effect. The influence of the measurement system itself on the global vibration response of the Brake-Reuß beam was shown to be tolerable.
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Notes
- 1.
Note that the static pressure film appears saturated, whereas the electronic pressure film shows clear gradients in the measured contact pressure. While these gradients may be evident in a digital analysis of the static pressure film, that information is inaccessible without a significant amount of work.
- 2.
Immediately after the hammer impact, the sensor sheet output consists of a superposition of the dynamic contact pressures generated by all participating modes in the frequency band excited by the impact (unfortunately, no low-pass filter could be applied on the output signal of the sensor sheet). Assuming a similar modal damping for all modes, the higher modes decay faster than the lower modes due to their higher vibration frequencies. Thus it seems reasonable that some time after the impact, the first mode is dominating the response and most of the dynamic contact pressure is generated by that first mode.
- 3.
Since we only measure the change of the contact area and the contact pressure in the interface and not the additional tensile stress in the bolts, this creates the impression of an unloading of the interface at larger response amplitudes.
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Acknowledgements
This research was conducted at the 2017 Nonlinear Dynamics of Coupled Structures and Interfaces Summer Research Program, sponsored by Rice University.
The authors would also like to thank the “Fond Interministeriel Unique” that funds the project CLIMA and the “Bourse-Oréal UNESCO Pour les Femmes et la Science” encouraging women to pursue careers in science.
The authors would also like to thank the National Natural Science Foundation of China (Grant No.51705422).
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Seeger, B., Butaud, P., Baloglu, M.V., Du, F., Brake, M.R.W., Schwingshackl, C.W. (2019). In Situ Measurements of Interfacial Contact Pressure During Impact Hammer Tests. In: Kerschen, G. (eds) Nonlinear Dynamics, Volume 1. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-74280-9_24
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DOI: https://doi.org/10.1007/978-3-319-74280-9_24
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