Energy Analysis of Propulsion Shaft Fatigue Process in Rotating Mechanical System Part I Testing Significance of Influence of Shaft Material Fatigue Excitation Parameters (original) (raw)
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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 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
Determination of Fatigue Life of Surface Propeller by Using Finite Element Analysis.pdf
Propeller design aims at achieving high propulsive efficiency at low levels of vibration and noise, usually with minimum cavitations. Achieving this aim is difficult with conventional propellers, as ships have become larger and faster propeller diameters have remained limited by draught and other factors. Surface piercing propeller o ffers an attractive alternative to highspeed crafts, which operate under limited draught. The performance of the vehicle depends upon the efficiency of the propelle r. The geometric shape and its surface finish will decide the efficiency of the propeller. The material used is carbon UD and alu minu m. The present project basically deals with the modeling, Analysis of the propeller using composite material of a marine vehicle having low draft. A propeller is complex 3D model geometry. CATIA modeling software is used for generating the blade model and tool path on the computer. Sectional data, pitch angle of the propeller are the inputs for the development of prope ller model. Finite element analysis was carried out using ABAQUS. The propeller model developed in CATIA is converted in to IGES file and then imported to HYPERM ESH for developing fine mesh of the model. As a part of the analysis static structural testing was conducted by varying material propert ies in pre-processing stage. Further fatigue analysis was performed to analyze the factor of safety. Based on the results obtained from both static analysis and dynamic analysis a better performing material is identified for the develop ment of a propeller. The post processed results obtained from both analysis methods recommends carbon UD/ Epo xy for the fabrication of propeller.
Journal of Polish CIMAC, 2012
The article presents the basic assumptions of the research project aimed, as the main scientific purpose, an identification of the slow-changeable energy processes surrounding the high-cycle fatigue of constructional materials within the plain mechanical system, especially the marine one, for diagnostic purposes. There is foreseen an application of alternative diagnostic methods based on energetic observations of the multi-symptom, continuous and irreversible alterations of the fatigue state within the material and construction of the elements transmitting the stream of mechanical energy from the propulsion engine to the propeller. Such methods will represent an essential supplement of already existing diagnosing systems of marine engines as well as marine propulsions. Only then an implementation of the condition based maintenance within the marine propulsion operation can be seen fit to approve. Second part of the paper demonstrates the results of preliminary experimental investiga...
Journal of Materials Research and Technology, 2019
In materials engineers, it is important to determine the cause of failure of a machine component, to prevent prospect occurrences and increase the performance of the component structure. In this study, the parameters of the fatigue life of machine shafts are investigated. An analysis of the nut cracking machine shaft was conceded for plastic deformations. The optimum safe and economical design of a machine shaft was proposed. The 3D model of a shaft was produced with Inventor ® using absolute coordinate. The results of the commercial finite element analysis (FEA) and calculations are compared with results obtained earlier by other methods. The analysis of 30 mm shaft diameters under the maximum torque of 72.0 Nm shows a factor of safety of 10, while the 20 mm shaft diameter under the same torque gives a factor of safety of 2. This will provide designers guidelines to forecast the design on fatigue strength of a machine shaft.
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.
Fatigue Failure of a Drive Shaft
2012
The drive shaft in the propulsion system of a boat broke, while the vessel was sailing along the Western Canadian coast. This part was made from a low-alloy steel grade 4340 quenched and tempered. Fractographic investigation at macro scale revealed that the shaft failed under low rotating-bending variable stress. Fatigue propagation occurred on about 95% of the total cross section of the shaft, under both low-cycle and high-cycle fatigue mechanisms. It was found that the fillet radius present at the fracture’s origin was smaller than the one provisioned by design. This situation has raised the stress level at this location higher than the one taken into consideration at the moment of the design calculations and caused the initiation of the cracking. Moreover, although the shaft has been quenched and tempered, its actual hardness did not have the optimal value for long-life fatigue strength.