نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه مهندسی مکانیک، دانشگاه ملی مهارت، تهران، ایران
2 گروه مهندسی ساخت و تولید، دانشکده مکانیک، دانشگاه تبریز، تبریز، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The failure mechanisms of polymer gears are significantly influenced by applied torque and the resulting surface temperature. Increased torque leads to higher contact stress and surface temperature, directly accelerating failure. Gear tests at different torque levels and multiscale analysis help identify key failure mechanisms and examine the relationship between mechanical loads and thermal behavior. In this study, polyoxymethylene (POM), a widely used polymer for plastic gears, was selected. Gear tests were conducted at five torque levels (6, 8, 10, 12, and 14 N·m). The surface temperature of the gears was monitored online during testing. Failure mechanisms were analyzed on both macroscopic and microscopic scales. Results showed that increasing torque from 6 to 14 N·m raised the surface temperature by up to 98%. This temperature rise at higher torques was attributed to a combination of mechanical and thermal factors. At 6, 8, and 10 N·m, failures such as pitch-line cracks, plastic deformation, and gear wear were observed. However, at torques above 10 N·m, macroscopic material flow and adhesive wear, along with severe microscopic material flow, occurred, attributed to the low thermal conductivity of POM.
کلیدواژهها [English]
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