Abstract
To evaluate the service life of spur gears and design high-performance gears, fracture characteristics must be examined. Since, asymmetric spur gears are not standardised, the majority of the existing literature studies of spur gear fracture behaviour are based on symmetric spur gears. The research of spur gear with asymmetric teeth is attracting attention as the industry seeks to improve load transmission capabilities and service life. This paper investigates the combined effect of pressure angle and other gear parameters suchs as module, no.of teeth and gear ratio on the fracture characteristics of asymmetric spur gears subjected to mix mode fracture. The stress intensity factor (SIF) at the fillet crack tip along the face width for each gear pair is determined based on strain energy release rate approach. An increase in pressure angle reduces the contact ratio and top land thickness which is not recommended for smooth operation of spur gears. Hence, combined effect of pressure angle with the other gear parameters such as module, number of teeth and gear ratio on SIF to improve resistance towards fracture is addressed. Further, the effective SIF and influence of mode I, mode II and mode III on effective SIF for each gear pair are explored. This study aims to provides valuable input to design asymmetric spur gears and to select the gear parameters.
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