Determination of equivalent transversely isotropic material parameters for sheet-layered lamination stacks

Baloglu MV, Ziegler M, Franke J, Willner K (2020)


Publication Type: Journal article

Publication year: 2020

Journal

Book Volume: 145

Article Number: 106915

DOI: 10.1016/j.ymssp.2020.106915

Abstract

This paper covers the accurate prediction of equivalent homogenized material parameters for sheet-layered lamination stacks, which are located in rotors and stators of electric motors. Modeling the structural and dynamic behavior of these parts is a challenging task due to the special layered design of these stacks, with a huge influence of the applied joining technology, here a full-surface bonding. For the derivation of equivalent transversely isotropic material parameters, three procedures, namely the rule of mixture, an analytical and numerical homogenization, are compared eventuating in only minor differences between them. The investigations show that rather the input parameters for these averaging methods, i.e. the individual material parameters of each layer, are crucial for an accurate modeling. Experimental tests are carried out on coated sheet laminations to determine the initially unknown bonding varnish thickness with two different measurement methods, the 3D laser scanning microscopy and instrumented indentation testing, resulting in almost equivalent and reasonable values. The capability of the ab initio deduced material parameters is demonstrated by comparing an experimental and numerical modal analysis of a sample lamination stack showing an almost perfect agreement. By this, it is also revealed that a varnish Young's modulus measured by nanoindentation is overestimated from a macroscopic point of view. Damping parameters of a bonded lamination stack are determined with the help of the experimental modal analysis showing a relatively low damped system.

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APA:

Baloglu, M.V., Ziegler, M., Franke, J., & Willner, K. (2020). Determination of equivalent transversely isotropic material parameters for sheet-layered lamination stacks. Mechanical Systems and Signal Processing, 145. https://doi.org/10.1016/j.ymssp.2020.106915

MLA:

Baloglu, Maximilian Volkan, et al. "Determination of equivalent transversely isotropic material parameters for sheet-layered lamination stacks." Mechanical Systems and Signal Processing 145 (2020).

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