Identification of the mechanical parameters of hard coating based on free vibration decay response

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (24) : 145-151.

SUN Wei, WANG Zhuo

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Abstract

Obtaining the mechanical parameters of hard coating is the premise of modeling and damping design of hard-coating composite structure. The most studies about identifying the mechanical parameters of hard coating are based on beam specimen and a complex test procedure. Here, a cantilever thin plate structure was considered, and a newer identification method was presented, which only needs to test the free vibration decay responses from resonance status for the uncoated and coated plate. Firstly, based on the free vibration decay responses, the principles of identifying storage modulus and loss factor of hard coating were proposed. Then, to effectively obtain the mechanical parameters of hard coating, the method of identifying some key parameters (such as envelop of response, instant resonance frequency and damping) was given. Next, the FEM modeling of hard-coating plate and solution of resonance frequency, modal strain energy and reference strain were described. Finally, the cantilever thin plate coated NiCoCrAlY+YSZ hard coating was chosen to display the proposed method and the storage and loss factor of this mixing coating were identified. Furthermore, the obtained material parameters were inputted into the created FEM model and the rationality of identified parameters was proved by comparing the first 6 orders resonance frequency obtained by measurement and FEM calculation respectively. The identification results show the change rules of storage modulus and loss factor of hard coating with the strain amplitude are almost consistent with the results listed in the other similar references. However, the results herein can more directly serve for the dynamic modeling of hard-coating plate-shape composite structure.

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free vibration decay response / hard coating / mechanical parameters / identification of parameters

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SUN Wei, WANG Zhuo . Identification of the mechanical parameters of hard coating based on free vibration decay response[J]. Journal of Vibration and Shock, 2016, 35(24): 145-151

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