A review on failure characteristics of polymer gear Wafiuddin Md Ghazali, Daing Mohamad Nafiz Daing Idris, Azizul Helmi Sofian, Januar Parlaungan Siregar and Ismail Ali Abdul Aziz MATEC Web Conf., 90 (2017) 01029 Published online: 20 December 2016 DOI: 10.1051/matecconf/20179001029