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A Comparative Study of Two ASTM Shear Test Standards for Chopped Carbon Fiber SMC
- Zhangxing Chen - Chongqing University ,
- Manlin Wang - Zhejiang University ,
- Yimin Shao - Chongqing University ,
- Qingping Sun - Nanjing University of Aeronautics and Astronautics ,
- Haibin Tang - Nanjing University of Aeronautics and Astronautics ,
- Hongyi Xu - Ford Motor Company ,
- Katherine Avery - Ford Motor Company ,
- Danielle Zeng - Ford Motor Company ,
- Xuming Su - Ford Motor Company
ISSN: 1946-3979, e-ISSN: 1946-3987
Published April 03, 2018 by SAE International in United States
Citation: Chen, Z., Wang, M., Shao, Y., Sun, Q. et al., "A Comparative Study of Two ASTM Shear Test Standards for Chopped Carbon Fiber SMC," SAE Int. J. Mater. Manf. 11(4):277-283, 2018, https://doi.org/10.4271/2018-01-0098.
Chopped carbon fiber sheet molding compound (SMC) material is a promising material for mass-production lightweight vehicle components. However, the experimental characterization of SMC material property is a challenging task and needs to be further investigated. There now exist two ASTM standards (ASTM D7078/D7078M and ASTM D5379/D5379M) for characterizing the shear properties of composite materials. However, it is still not clear which standard is more suitable for SMC material characterization. In this work, a comparative study is conducted by performing two independent Digital Image Correlation (DIC) shear tests following the two standards, respectively. The results show that ASTM D5379/D5379M is not appropriate for testing SMC materials. Moreover, the failure mode of these samples indicates that the failure is caused by the additional moment raised by the improper design of the fixture. Tests following ASTM D7078/D7078M can generate sound results in most cases, and therefore the ASTM D7078/D7078M seems to be a more suitable standard for characterizing chopped carbon fiber SMC material.