The joint strength was also evaluated by conducting gear fatigue tests using a power absorption test rig at various torque levels and at a constant gear rotational speed. A molten material due to fusion bonding was observed at the interfaces. Clear hub and tooth region separation without any distortion was observed in joint shear tests. ![]() Joint strength of the selectively reinforced gear was estimated using shear tests. Two different geometries, circular and spline shaped hubs were used for developing the selective reinforced gears by multi-shot injection-molding process. ![]() High performance high cost short carbon fiber reinforced Nylon 66 is used in the highly stressed tooth region and low cost unreinforced Nylon 66 is used in the hub region. A new design methodology is developed to mold the polymer spur gears with high strength fiber reinforcement only in the highly stressed region.
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