Contact stresses in the process of involuate cylindrical spur gears meshing are analyzed in detail.Taking a pair of gears for example and using FEA,results of the FEA and the Herz formula are compared.The imprecise of the contact stress calculation in the GB is revealed,which provides a reference for designing and further studying.
One of the biggest problems to predict the bending fatigue life of gear is lack of S-N data from the standard gear specimen. It is expensive and long time to spend to do the specimen tests. The bending fatigue property data from database is not enough to fulfill the engineering needs. To solve the problem, multiaxial methods are used to predict the bending fatigue life of gears and FEA method is used to analyze the stress of gear teeth root. Result shows that McDiarmid model, Findley model and Maximum shear stress model fulfill the engineering needs and McDiarmid method is the most accurate.
Berzelius failed to make use of Faraday's electrochemical laws in his laborious determination of equivalent weights.