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Forming Limit Test of Asymmetric Al-Polymer Laminate Composite Film

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Abstract:

As environmental issues arise, increasing battery efficiency is emerging as an important task. To manufacture more efficient lithium-ion batteries, the industry is striving to increase the depth of battery cell. A growing number of companies are focusing on developing pouch-type batteries using materials with high formability. To produce the battery cell with bigger depth, understanding of the formability of the material is important. Forming limit test can be considered. The material used in pouch-type batteries is an asymmetric aluminum-polymer laminate composite, which is consisted of four layers: polypropylene, aluminum, nylon, and PET. Because of good formability of polymer layers, forming limit curve cannot be obtained using typical forming limit test such as experiment using Nakazima specimen. Therefore, the modified Marciniak testing method is implemented for this research, which is helpful for making strain concentration in the middle of the specimen. In the modified Marciniak test, a dummy sheet is layered between the specimen and punch, to prevent the fracture around the region contacting with the fillet of the punch. In this research, different kinds of polymers were tried as the dummy sheet material. In addition, specimens of various designs were tested and the forming limit test result of Al-Polymer film with thickness of 153\mu m was converted using Polar Effective Plastic Strain (PEPS) approach.

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Periodical:

Solid State Phenomena (Volume 388)

Pages:

141-151

DOI:

https://doi.org/10.4028/p-iS64g3

Citation:

Cite this paper

Online since:

April 2026

Authors:

Cheol Sagong*, Taek Jin Jang, Taegyun Ahn, Jeong Whan Yoon

Keywords:

Al-Polymer Laminate Composite Film, Forming Limit, Modified Marciniak Test, Polar Effective Plastic Strain (PEPS) Approach

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Creative Commons CC BY 4.0

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* - Corresponding Author

References

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