*2.1. Materials*

PEEK and its fiber-reinforced materials were provided by Nanjing Shousu Special Engineering Plastic Products Co., Ltd. (Nanjing, China). In this paper, five kinds of materials were investigated, which include the pure PEEK, carbon-fiber-reinforced PEEK with 10% mass fraction (CF10/PEEK) and 30% mass fraction (CF30/PEEK), glass-fiber-reinforced PEEK with 10% mass fraction (GF10/PEEK) and 30% mass fraction (GF30/PEEK). The

average diameter and length of carbon fiber are 8 and 40 μm. The average diameter and length of glass fiber are 10 and 60 μm. The materials were prepared with molding.
