Using stress relief grooves to reduce stress concentration on axle drive shaft

Advances in Materials Science and Engineering

et al. 2020

Fatigue life prediction is an important part of the reliability and durability analysis of automobile components. Based on Wang and Brown’s framework, multiaxial random fatigue damage was adopted to predict the fatigue life of half-shaft. The stress analysis of half-shaft was resolved analytically to determine the local stress tensor in the potential area of fracture. The maximum shear strain fatigue damage parameter and the normal stress fatigue damage parameter were evaluated to predict the fatigue life of half-shaft. The results show that the prediction method is reliable and meets the service life and safety requirements.

“…However, bending or torsion loads are often treated separately [7,8]. And most of these studies on half-shaft are based on uniaxial fatigue theory [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life Prediction of Half‐Shaft Using the Strain‐Life Method

Liu

Advances in Materials Science and Engineering

et al. 2020

“…Other authors have studied their effects with and without optimization algorithms, on mechanical structures as vessels or bars. Shin et al (2014) pointed out the effectiveness of relief grooves as a mean to reduce stress concentration on notched shafts, while they also mentioned that the detailed geometry of such grooves is still subject to discussion.…”

Section: Introductionmentioning

confidence: 99%

Size optimization of shoulder filleted shafts with relief grooves for improving their fatigue life

et al. 2017

Although in scientific literature there are studies regarding the inclusion of relief grooves in order to diminish the amount of stress concentration in stepped shafts, the incorporation of optimization algorithms capable of parametrically determining their geometry remains unexplored. In this paper, an approach to the problem of size optimization of shoulder filleted shafts with relief grooves and subject to axial loads is presented. The objective of the optimization is to minimize the maximum value of stress at both, the root of the shoulder fillet, and the root of the groove, thus minimizing stress concentration and improving fatigue life of such elements. Under this methodology, different percentages of reduction of stress are achieved for the shafts with relief grooves, in comparison with the shafts without relief grooves. The novelty of this approach lies in the incorporation of an algorithm for the determination of the optimum geometry of the grooves. Keywords:Size optimization, stress concentration, relief groove RESUMENAun cuando en la literatura científica se puede hallar artículos sobre la inclusión de ranuras de alivio para disminuir el nivel de concentración de esfuerzo en flechas escalonadas, la incorporación de algoritmos de optimización capaces de determinar su geometría de manera paramétrica permanece sin explorarse. En este artículo se presenta un enfoque al problema de optimización de tamaño de flechas escalonadas con ranuras de alivio, sujetas a cargas axiales. El objetivo de la optimización es minimizar el valor máximo del esfuerzo, tanto en la raíz del escalón como en la raíz de la ranura, disminuyendo la concentración de esfuerzo y mejorando la vida a la fatiga de tales elementos mecánicos. Bajo esta metodología, se alcanzan diversos porcentajes de reducción del esfuerzo al comparar las flechas ranuradas con las flechas no ranuradas. El enfoque aporta la incorporación de un algoritmo para la determinación de la geometría óptima de las ranuras de alivio. S.E.P.I. Zacatenco, I.P.N., Mexico. E-mail: johann009@yahoo.com 2 Ph.D. in Physics, Université Libre de Bruxelles, Belgium. Affiliation: S.E.P.I.Zacatenco, I.P.N., Mexico. E-mail: sammotion@yahoo.com.mx 3 Ph.D. in Mechanical Engineering, S.E.P.I. Zacatenco, I.P.N., Mexico. Affiliation: U.P.I.I.T.A., I.P.N., Mexico. E-mail: jsilval@ipn.mx 4 M.Sc. in Mechanical Engineering, S.E.P.I. Zacatenco, I.P.N., Mexico. Affiliation: S.E.P.I. Zacatenco, I.P.N., Mexico. E-mail: alejo_10b10@yahoo.com.mx 5 Ph.D. in Mechanical Engineering, S.E.P.I. Zacatenco, I.P.N., Mexico. Affiliation: S.E.P.I. Zacatenco, I.P.N., Mexico. E-mail: ingaor@hotmail.com How to cite: González-Mendoza, J.M., Alcántara-Montes, S., Silva-Lomelí, J.J., De La Cruz-Alejo, C., Ocampo-Ramírez, A., (2017). Size Optimization of shoulder filleted shafts with relief grooves for improving their fatigue lives.

“…Zhang et al 7 used a second-order inelastic analysis method to evaluate the strength and serviceability reliabilities of steel. To improve the reliability of an axle drive shaft, Shin et al 8 applied stress relief grooves on the drive shaft and analysed its reliability by conducting finite element analysis. The reliability of the drive shaft was improved significantly and fatigue life increased by nearly 3.3 times.…”

Section: Introductionmentioning

confidence: 99%

Reliability analysis on the drive system of a gear-type oil pump with variable displacement

Liu

Advances in Mechanical Engineering

et al. 2016

The service life of a gear-type oil pump with variable displacement is affected by the reliability of its drive system. To analyse the reliability of the drive system and improve the service life of the oil pump, a virtual prototype model was established based on real conditions and multi-body dynamic theory. The model was validated according to bench test results. And simulation results were in good agreement with test results. A numerical method was used to simulate the dynamics model and the dynamic meshing forces of gear pairs were obtained. A reliability evaluation model of the drive system was built. The reliability of each part and the entire drive system were calculated. And system reliability was analysed and discussed when 45 steel or 40Cr was utilised as the material for the drive system. The results provided a foundation for the reliability design and the dynamic optimisation of a gear-type oil pump with variable displacement.