The influence of temperature and strain rate on the constitutive and damage responses of polychlorotrifluoroethylene (PCTFE,Kel-F 81)

摘要

Polychlorotrifluoroethylene (PCTFE),also known as Kel-F 81,is a semi-crystalline fluoropolymer.Although it has been employed in a wide range of cryogenic components,valve seats,seals,and microelectronics packaging,its mechanical behavior has received limited coverage in the literature.In this work,we present the tensile and compressive constitutive response of PCTFE for a range of temperatures (-85 to 150 deg C) and strain rates (1 x 10~(-4)-2.9 x 10~3 s~(-1)).Both large-strain experiments based on flow stress and small-strain dynamic mechanical analysis (DMA) using the elastic modulus exhibit a strong increase in the glass transition temperature,T_g,with increasing strain rate.The quasistatic fracture behavior of PCTFE is presented using J-integral fracture experiments.Finally,a discussion of the implication of the constitutive and damage responses of PCTFE on impact failure modes observed in Taylor impact experiments is presented.