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.


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    Title :

    A Comparative Study of Two ASTM Shear Test Standards for Chopped Carbon Fiber SMC


    Additional title:

    Sae Int. J. Mater. Manf
    Sae International Journal of Materials and Manufacturing


    Contributors:
    Zeng, Danielle (author) / Tang, Haibin (author) / Xu, Hongyi (author) / Avery, Katherine (author) / Wang, Manlin (author) / Sun, Qingping (author) / Su, Xuming (author) / Shao, Yimin (author) / Chen, Zhangxing (author)

    Conference:

    WCX World Congress Experience ; 2018



    Publication date :

    2018-04-03


    Size :

    7 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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