織物CF/PPS積層板の超音波スポット融着接合挙動に及ぼす樹脂エネルギーダイレクタの厚さの影響

抄録

This study aims to reveal the ultrasonic spot welding behavior of carbon fiber reinforced thermoplastics (CFRTP) using polymer based energy director. The materials used for spot welding are woven-CF/PPS laminates and energy director consisting of PPS polymer. The ultrasonic oscillator for the ultrasonic spot welding process has an oscillation frequency of 40 kHz and a maximum output of 600 W. The welding load and displacement of ultrasonic horn during welding process were precisely controlled by using an electric servo press machine. The effects of welding load and thickness of energy director on ultrasonic welding behavior and joining strength were investigated to reveal the welding behaviour. The temperature of the joining part during ultrasonic welding was measured by a ultrafine thermocouples, and the welding load and displacement of the horn was measured by the servo press machine. The welding part was evaluated by microscopic observation and cross-sectional observation using microscope and SEM. From the experimental results, it was revealed that the thickness of the energy director was significantly affects the ultrasonic welding behavior. From the result of single lap tensile shear test, it was found that the there was proper thickness of energy director to increase the joining strength.