Interfacial prediction and tensile damage tracking of carbon fiber reinforced polyamide 66 using Z-axis electrical resistance method

Abstract

Deformation monitoring of the inner fabric is important to ensure the quality of continuous fiber-reinforced composites. A Z-axis electrical resistance (Z-ER) mapping method was utilized as an accurate evaluation method to predict the internal composition and deformation of carbon fiber reinforced polyamide composites (CF/PA) during tensile load. The electrical resistance change rate (ERC) in the tensile direction and the Z-ER for tensile stress were utilized to detect the tensile damage of carbon fiber reinforced polyamide composites. Based on the Z-ER mapping, the internal state of carbon fiber reinforced polyamide composites was categorized into three types: uniform electrical resistance (ER), large standard deviation (SD), and tilt ER. The evaluation method was also able to predict the probability of defective CF/PA exhibiting that the normal tensile failure behavior was approximately 31.5%. This process of detection can be integrated as an in-line evaluation technique to automate and standardize carbon fiber reinforced polyamide composite manufacturing.