S&M Young Researcher Paper Award 2020
Recipients: Ding Jiao, Zao Ni, Jiachou Wang, and Xinxin Li [Winner's comments]
Paper: High Fill Factor Array of Piezoelectric Micromachined
Ultrasonic Transducers with Large Quality Factor

S&M Young Researcher Paper Award 2021
Award Criteria
Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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S&M2709 Research Paper of Special Issue

Experimental and Simulation Analysis of Effect of Fillet Radius of Micro Square Hole on Copper Sheets in Deep Drawing of Sheets

Tsung-Chia Chen, Ching-Min Hsu, and Cheng-Chi Wang

(Received May 15, 2021; Accepted August 19, 2021)

Keywords: micro deep drawing, springback, copper, material deformation history

In the design and fabrication of molds in the deep drawing process, the gap between the punch and the mold is extremely small. Obtaining a product of the correct size and shape necessitates the control of certain variables in the process, consideration of the problems of springback after load removal and the occurrence of cracks in the drawing process, and the estimation of the punch load. In this study, which focused on copper sheets, the influence of the scale effect and fillet radius of a micro square hole on thin sheets was considered on the basis of an updated Lagrangian formulation and finite element analysis. Sheet behavior was simulated using a micro-elastoplastic material model, the performance of which was compared with that of models involving conventional materials. Subsequently, the Dynaform LS-DYNA solver was used for simulation analysis, and pre- and post-processing were carried out to obtain the material deformation history, as well as to determine the thickness change distribution and material stress and prepare strain distribution maps. It was found that the scale effect of the sheet thickness influences the relation between the punch load and stroke, the distribution of thickness, the distribution of stress and strain, the maximum diameter of the flange hole, and the maximum flange height. Finally, the simulation results were compared with experimental results to confirm the accuracy of 3D finite element analysis of the elastoplastic deformation. The results show the influence of the fillet radius of the inner hole (Br) for copper sheets on the drawing process: the punch load increases with increasing Br, but the minimum thickness of the formed flange decreases as Br increases. The maximum principal stress/strain and the flange height increase as Br increases. The findings serve as a valuable reference for the design and processing of micro deep drawing.

Corresponding author: Cheng-Chi Wang

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