Design and finite element analysis of a fatigue life prediction for safe and economical machine shaft (original) (raw)
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Fatigue Analysis of Drive Shaft
The main objective of this analysis is to investigate the stresses& deflections of drive shaft subjected to combine bending & torsion. Then checking for fatigue life as well as comparing the results with analytical calculations to verify accuracy of the results. Drive shaft is a critical component used in paper converting machines. It carries a load of two vacuum rollers weighing around 1471N and rotates at 1000 rpm, also subjected to reaction force of knife cutter and gears. This shaft has key slots and at the area of change in cross sections giving rise to localize stress concentration. Hence there is a scope of analyzing this part to predict its fatigue life and damage. Keywords: Fatigue Analysis, Shaft stress analysis, FEM analysis, shaft failure analysis
IJERT-Prediction of Crack Growth and Fatigue Life Estimation of Shaft-A Review
International Journal of Engineering Research and Technology (IJERT), 2013
https://www.ijert.org/prediction-of-crack-growth-and-fatigue-life-estimation-of-shaft-a-review https://www.ijert.org/research/prediction-of-crack-growth-and-fatigue-life-estimation-of-shaft-a-review-IJERTV2IS120930.pdf Fatigue life estimation techniques and pump shaft failure are reviewed in this paper. Failure (fracture) of a pump shaft is selected as investigation topic. It essentially focuses on fatigue analyses, followed by fatigue life estimation of the component using fracture mechanics concepts. Fracture mechanics can be used to analyse the growth of small cracks to critical size by fatigue loading and to evaluate the fitness-for-service, or life extension of existing equipment. Linear elastic fracture mechanics (LEFM) is selected as a theoretical method for predicting the fatigue life of the notched component (pump shaft). LEFM estimates the fatigue life based on the fact that a crack pre-exists in the component and that the fatigue life is directly dependent on the stress intensity factor, which in-turn depends on initial crack length. Introduction:
Design and Fatigue Optimization of Drive Shaft
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2021
This work aims towards the design and optimization of the drive shaft as there is increasing demand for weight reduction in an automobile vehicle. The drive shaft is basically a torque transmitting element which transmit the torque from the differential gearbox to the respective wheels. In general, the drive shafts are subjected to fluctuating loads as the torque requirement changes according to the road conditions. Due to this, the drive shaft should be designed considering fatigue failure. The Maruti Suzuki Ertiga model is chosen for design and optimization of the drive shaft. For the fatigue life predicting of the drive shaft, the S-N curve approach is used. Furthermore, the inner diameter of the shaft is varied to obtain the optimized diameter of a hollow shaft which can withstand these fluctuating loads without failure. Along with fatigue life prediction, the natural frequency of the hollow shaft is also calculated. Furthermore, the parametric analysis is carried out of fatigue FOS, Von mises stress, weight and natural frequency of the shaft by varying the diameter ratio of the hollow shaft, and the nature of variation of these parameters are plotted in their respective graphs. The design is validated by performing FEA analysis for each case of a hollow shaft using Ansys software. Finally, from the FEA analysis we conclude that the optimized dimensions of the hollow drive shaft are safe.
FATIGUE ANALYSIS OF OUT-PUT SHAFT SUBJECTED TO PURE TORSION
IAEME PUBLICATION, 2019
In material engineering it is important to determine the cause of the failure & prevention of the failure .In present day the failure of the machine component is about 90% of the failure is because of the fatigue. In present study the failure of the shaft in the yaw gear box is analyzed .As we the shaft is rotating part of the engine it transmit the power from the one part of the engine to another part. It holds the maximum stress. In this case shaft of heat treated component with ultimate tensile strength Su= 2100Mpa is analysis done with ANSYS (FEA) software & compared with the theoretical calculation. There are dif erent methods which are used to predict fatigue life include stress life(S-N), strain Life (E-N) and Linear Elastic Fracture Mechanics (LEFM). In this project study, S-N approach is used to predict fatigue life for out-put shaft.
Shaft Design under Fatigue Loading By Using Modified Goodman Method
In this paper, shaft employed in an Inertia dynamometer rotated at 1000rpm is studied. Considering the system, forces, torque acting on a shaft is used to calculate the stresses induced. Stress analysis also carried out by using FEA and the results are compared with the calculated values. Shaft is having varying cross sections due to this stress concentration is occurred at the stepped, keyways ,shoulders, sharp corners etc. caused fatigue failure of shaft. So, calculated stress concentration factor from which fatigue stress concentration factor is calculated. Endurance limit using Modified Goodman Method, fatigue factor of safety and theoretical number cycles sustained by the shaft before failure is estimated and compared results with FEA.
IJERT-Fatigue Analysis of Composite Drive Shaft
International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/fatigue-analysis-of-composite-drive-shaft https://www.ijert.org/research/fatigue-analysis-of-composite-drive-shaft-IJERTV4IS050628.pdf The projects aims at replacing the conventional drive shaft with composite drive shaft which will provide us the better mechanical properties i.e (Torque transmitting capacity, and fatigue life of the shaft).The research paper will include the comparison of these properties of conventional steel shaft with the composite drive shaft .The drive shaft selected is applicable to TATA 407 pick up vehicle which is at present using the conventional steel drive shaft. Our main aim is to show that the fatigue life of composite drive shaft is much better than conventional steel drive shaft.
International Journal of Mechanical Sciences, 2002
Analytical approaches concerning size, stress gradient and technological e ects such as surface roughness and residual stresses induced during manufacturing processes are presented and discussed in this paper. Their implementation into the Short-Crack-Model for fatigue-life (lifetime to initiation of cracks of a size of 0.5 -1 mm) prediction of engineering components subjected to cyclic loading is explained in detail. The procedures to consider the aforementioned e ects are demonstrated by using an example of a forged and tempered steering shaft made of low-alloyed steel subjected to variable amplitude bend loading. The corresponding experimental results are used to check the accuracy of the analytical fatigue-life prediction. The comparison between analytically calculated and experimentally determined fatigue-life values emphasises the signiÿcance of technological e ects (surface roughness, residual stresses) on fatigue-life estimation and the usefulness of the Short-Crack-Model for fatigue-resistant design of engineering components. ?
Zenodo (CERN European Organization for Nuclear Research), 2019
The intention behind the research study is an approach to find fatigue analysis of a propeller shaft used in an automobile vehicle. Propeller shaft is used basically to transmit the power generated from the engine. An attempt has been made in the study to find the best suited material for propeller shaft. The study indicates the deformation occurs due to the frequent changes in loading conditions. For further work two materials has been taken viz steel and composites. Propeller shaft is used to transfer rotary motion to the differential by using constant mesh, or synchromesh gear box. Propeller shaft converts the torque to the rear wheel when vehicle is in moving condition. The power generated from engine is stored in flywheel which is then converted to clutch and transmitted to gear box, form gear box power is transmitted through propeller shaft to rear wheels. The position of propeller shaft is in such a way that one is connected to gear box and another end is connected to rear axle differential and finally torque is transmitted to rear wheels .So the shaft should be made of such material with suitable diameter and length to withstand torsional stresses developed by torque transmission , also it should be well balanced so that the vibration occurrence should be minimum. Also Composites as an alternative is used, from composites shaft is designed. After designing, analysis is done to find out the stresses. Also, it will help to rectify torsional strength, bending stresses to find the suitable material for the shaft. Finally, the research suggests the best material for propeller shaft.
Fatigue analysis of the cracked rotor by means of the one- and three- dimensional dynamical model
2006
In the paper the structural one-dimensional hybrid dynamical model of the entire vibrating rotor-shaft system and the three-dimensional finite element model of its cracked shaft zone were applied for a fatigue life prediction of the machine faulty segment under coupled bending-torsional-axial vibrations. The steady-state dynamic response amplitudes, obtained by means of the one-dimensional model of the system, have been used for the three-dimensional model as an input data for determination of maximal stresses and stress intensity factors at the crack tip. These quantities together with the Wöhler curves enable us an approximate determination of load limits responsible for a probable further crack propagation. By means of the proposed approach one can predict a damage probability of the faulty rotor-shaft system of arbitrary structure operating under various dynamic and quasi-static loads affecting a crack of various sizes and shaft locations. From the investigations performed for various crack axial locations on the shaft with respect to bearing supports of the single-and double-span rotorshaft systems, it follows that a strength of the cracked zone is much more sensitive to normal stresses due to bending and axial oscillations than to tangential stresses caused by torsional vibrations.