Investigation of subsurface fatigue crack in PEEK shaft under one-point rolling contact by using 2.5D layer observation methodHitonobu KOIKE, Genya YAMAGUCHI, Koshiro MIZOBE, Yuji KASHIMA and Katsuyuki KIDAMATEC Web Conf., 130 (2017) 09001DOI: https://doi.org/10.1051/matecconf/201713009001