• Amit Zala
• Divyang pandya
• Parth patel

Contact fatigue, one of the main failure modes of gear tooth flanks, is caused by repeated compression and shear stress cycles. In this study, the surface and subsurface stresses of gear teeth are investigate during Hertzian theory and the finite element method. The number of loading cycles required for fatigue crack initiation is predicted using method based on the multiaxial fatigue mechanism. Friction is found to shift the distributions of von Mises stress, change the extreme values of the shear stress cycle, and results in low fatigue life. The stresses near the engagement and recess areas a real so found to be greater than the static contact conditions and thus result in low fatigue life, particularly at high speeds. Cracks initiated at the surface may lead to typical life-limiting fatigue failure modes such as pitting and tooth root breakage. Furthermore, the contact load on the flank surface induces stresses in greater material depth and may lead to crack initiation below the surface if the local material strength is exceeded. Over time the sub-surface crack propagation may lead to gear failure referred to as “tooth flank fracture”.

Spur Gear, Finite element dynamics analysis, cracks initiation.

"An investigation of crack initiation in spur gears based on finite element dynamics analysis", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.422-426, June-2019, Available :http://www.jetir.org/papers/JETIR1906840.pdf

"An investigation of crack initiation in spur gears based on finite element dynamics analysis", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp422-426, June-2019, Available at : http://www.jetir.org/papers/JETIR1906840.pdf