Experimental and numerical investigations of the mechanical behavior of half sandwich laminate in the context of blanking

doi:10.1007/s40436-020-00308-z

Advances in Manufacturing ›› 2020, Vol. 8 ›› Issue (2): 177-188.doi: 10.1007/s40436-020-00308-z

Experimental and numerical investigations of the mechanical behavior of half sandwich laminate in the context of blanking

Sheng Cai¹, Lin Chen²

1 Department of Vehicle Engineering, College of Engineering, China Agricultural University, Beijing 100083, People's Republic of China;
2 CW Bearing GmbH, Hamburg 22113, Germany

收稿日期:2019-09-15 修回日期:2020-03-18 出版日期:2020-06-25 发布日期:2020-06-08
通讯作者: Sheng Cai E-mail:sheng.cai@cau.edu.cn
基金资助:
The German Academic Exchange Service (DAAD) provided financial support for this study, which is gratefully acknowledged here. The author would like to acknowledge the support from the Institute of Forming Technology and Lightweight Construction, TU Dortmund.

Experimental and numerical investigations of the mechanical behavior of half sandwich laminate in the context of blanking

Sheng Cai¹, Lin Chen²

1 Department of Vehicle Engineering, College of Engineering, China Agricultural University, Beijing 100083, People's Republic of China;
2 CW Bearing GmbH, Hamburg 22113, Germany

Received:2019-09-15 Revised:2020-03-18 Online:2020-06-25 Published:2020-06-08
Contact: Sheng Cai E-mail:sheng.cai@cau.edu.cn
Supported by:
The German Academic Exchange Service (DAAD) provided financial support for this study, which is gratefully acknowledged here. The author would like to acknowledge the support from the Institute of Forming Technology and Lightweight Construction, TU Dortmund.

摘要/Abstract

摘要： In this study, the complex mechanical behavior of an aluminum/low-density polyethylene (LDPE) half sandwich structure was investigated during the blanking process. Mechanical tests were conducted for the polymer and metal layer and the delamination behavior of the adhesive between the two layers. A new testing device was designed for detecting the delamination under tensile mode. Corresponding finite element models were established for the mechanical tests of the metal layer and the delamination of both layers for inverse parameter identification. Material parameters for Lemaitre-type damage, Drucker-Prager, and cohesive zone models were identified for the metal, polymer, and adhesive, respectively. A finiteelement (FE) model was established for the blanking process of the sandwich structures. The experimental forcedisplacement curves, obtained in the blanking process of the half sandwich sheet, were compared with the predicted results of the FE model. The results showed that the predicted force-displacement curves and the experimental results were in good agreement. Additionally, the correlation between cutting clearance and changes in the forcedisplacement curves was obtained. Three feature values quantitatively described the imperfection of the experimental cutting edge. The effect of punch clearance on these values was studied numerically and experimentally. The results indicated that a smaller clearance generated a better cutting-edge quality. The stress state of the half sandwich structure during blanking was analyzed using the established FE model.

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-020-00308-z

关键词: Sandwich plates, Blanking, Continuum damage mechanics (CDM), Drucker-Prager model, Cohesive zone model

Abstract: In this study, the complex mechanical behavior of an aluminum/low-density polyethylene (LDPE) half sandwich structure was investigated during the blanking process. Mechanical tests were conducted for the polymer and metal layer and the delamination behavior of the adhesive between the two layers. A new testing device was designed for detecting the delamination under tensile mode. Corresponding finite element models were established for the mechanical tests of the metal layer and the delamination of both layers for inverse parameter identification. Material parameters for Lemaitre-type damage, Drucker-Prager, and cohesive zone models were identified for the metal, polymer, and adhesive, respectively. A finiteelement (FE) model was established for the blanking process of the sandwich structures. The experimental forcedisplacement curves, obtained in the blanking process of the half sandwich sheet, were compared with the predicted results of the FE model. The results showed that the predicted force-displacement curves and the experimental results were in good agreement. Additionally, the correlation between cutting clearance and changes in the forcedisplacement curves was obtained. Three feature values quantitatively described the imperfection of the experimental cutting edge. The effect of punch clearance on these values was studied numerically and experimentally. The results indicated that a smaller clearance generated a better cutting-edge quality. The stress state of the half sandwich structure during blanking was analyzed using the established FE model.

The full text can be downloaded at https://link.springer.com/article/10.1007/s40436-020-00308-z

Key words: Sandwich plates, Blanking, Continuum damage mechanics (CDM), Drucker-Prager model, Cohesive zone model

Sheng Cai, Lin Chen. Experimental and numerical investigations of the mechanical behavior of half sandwich laminate in the context of blanking[J]. Advances in Manufacturing, 2020, 8(2): 177-188.

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Experimental and numerical investigations of the mechanical behavior of half sandwich laminate in the context of blanking

Experimental and numerical investigations of the mechanical behavior of half sandwich laminate in the context of blanking

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