Determination of mechanical properties of thermoplastic polyester elastomer matrix composite springs developed for the torque limiter damping system of hybrid vehicles and numerical simulation damping system

Due to the C02 emission ratio restrictions, hybrid vehicles become more popular nowadays. Because of that reason research studies on hybrid vehicles and their powertrain systems have been increased recently. There are several type of hybrid vehicle powertrain structures in use by car manufacturers, it depends on drive modes and design of conventional and electrical engine layout design. Most known of these structures is power split hybrid structure. In this study a thermoplastic elastomer spring was mechanically investigated, which has been designed for torque limiter of a power split type hybrid powertrain. The function of that elastomer spring is to damp the abnormal contact between damper inner metallic components during limiting function of torque limiter. Thesis study is also including material improvement studies for a thermoplastic elastomer spring. Materials developed were tested under compression test and cycling test to compare permanent deformation perfromance and also at the endurance test to compare wear performance. At the end of study several type thermoplastic elastomer spring geometries were studied with design of experiments methods and design rules which can be used as a design guide for thermoplastic elastomer spring design were created. Numerical and experimental studies are completed to analyze wear performance, permanent deformation level and loss of length property under cycling tests of a thermoplastic elastomer spring. Results gained at the end of finite element anaylsis studies and experiments were compared.