Reliability prediction of the fatigue life of a crankshaft (original) (raw)
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A fatigue analysis and life estimation of crankshaft–A review
The main objective of writing review on fatigue life of crankshaft is to investigate the behavior of crankshaft under complex loading conditions. Automobile industries are always interested to develop a new product which will be innovative and fulfill market expectations. All the engine components are subjected to constant to varying load which also varies in direction and due to these, components may fail. Bending and shear stress due to twisting are common stresses acting on crankshaft. Due to the repeated bending and twisting, crankshaft fails, as cracks form in fillet area. Hence, fatigue plays an important role in crankshaft development. Accurate prediction of fatigue life is very important to insure safety of components and its reliability. This review paper considers crankshaft as an important part of engine components, as forces which are acting on crankshaft are many and variable in nature. This paper presents an idea about research undertaken or completed on fatigue life o...
Fatigue Failure Analysis of Crankshafts-A Review
Fatigue Failure Analysis of Crankshafts-A Review, 2020
The crankshaft is an essential component of internal combustion engines, which is widely used in an automobile. The most common modes of crankshaft failure are fatigue failure. During its operation, the crankshaft is always subjected to a cyclical load. Besides, the bending and shear load are also typical loads on the crankshaft. Due to the effect of these loads, the crankshaft fails and causes a substantial economic and loss of life. Therefore, predicting the more accurate fatigue life of the crankshaft is essential to save the economic and life losses. This paper discusses several existing approaches to predicting crankshaft fatigue life. Various analytical and experimental approaches used to predict fatigue life discussed. The most common analytical approaches used to predict life are total life approaches, crack initiation life prediction approaches, and crack growth. The review shows that most crankshaft failures are the result of fatigue. The crack initiation can occur due to high-stress concentration or as a defect during manufacture and can eventually propagate under cyclic loads.
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/fatigue-failure-analysis-of-an-automotive-crankshaft-and-to-find-its-behavior-under-different-operating-loads https://www.ijert.org/research/fatigue-failure-analysis-of-an-automotive-crankshaft-and-to-find-its-behavior-under-different-operating-loads-IJERTV3IS10469.pdf Crankshafts in automotive engines experience a significant number of cyclic loads during its service. Mechanical fatigue failures are the most common cause of crankshaft failures. Crankshafts fail at the fillet regions of main journal and crankpin. The project highlights how to predict & improve the fatigue life of crankshaft using FEA technique. I will take the data for crank shaft such as dimensions and loads and torque for maximum and minimum rpm .Then create a CAD model of crankshaft by using Uni-Graphis. Then the fatigue failure analysis will be carried out by using ansys software. The crankshaft will be modified by using sufficient radius to the fillets regions where the stress concentration occurs. Then the structural analysis is to be carried out for the finite element model for Modified crankshaft. Then, the fatigue failure analysis is carried out by using ansys software. Then the results are compared for the existing and modified crank shaft all speeds and torques. Fatigue life, Total deformation and Factor of safety are the outcome of the Fatigue failure analysis. Project establishes the procedure for predicting and improvement the fatigue life of any component.
IJERT-Fatigue Life assessment of crankshaft under Bending and Torsional Loading
International Journal of Engineering Research and Technology (IJERT), 2013
https://www.ijert.org/fatigue-life-assessment-of-crankshaft-under-bending-and-torsional-loading https://www.ijert.org/research/fatigue-life-assessment-of-crankshaft-under-bending-and-torsional-loading-IJERTV2IS110709.pdf Fatigue is a phenomenon which occurs due to repetitive loading on the component. Fatigue due to combined bending and torsion is most common reason for failure of IC engine crankshaft. The objective of this work is to evaluate fatigue life of an alloy steel crankshaft. Physical testing of crankshaft subjected to combined bending and torsion for evaluation of fatigue life is not a feasible solution because of very high cost of experimentation. Also, to sustain in competitive market, timely delivery of the component is very important. The crankshaft is modelled and stresses are analysed using finite element software. The fatigue life of crankshaft subjected to pure bending and pure torsion loading is obtained during actual testing. The possibility of using fatigue test data from pure bending and pure torsion loading is explored in present work to estimate the fatigue life due to combined loading. The results obtained from simulations are then correlated with experimental results of loading.
Numerical Prediction of Fatigue Life of Crankshaft
In Automobile manufacturing plant, it was noticed that 7 out of 1000 crankshafts are prone to failure. This work is concentrated to identify the cause of failure in the crankshaft and to improve the fatigue life of the crankshaft by performing parametric study. In parametric study, the crankshaft is designed and analyzed in ANSYS WORKBENCH by varying the fillet radius of journal bearing. The maximum equivalent alternating stress and cycles to failure were predicted in numerical analysis. The cycles to failure are increased by varying the parameter and hence the fatigue life of crankshaft is improved.
Crankshaft is one of the critical components of an IC engine, failure of which may result in disaster and makes engine useless unless costly repair performed. It possesses intricate geometry and while operation experiences complex loading pattern. In IC engines, the transient load of cylinder gas pressure is transmitted to crankshaft through connecting rod, which is dynamic in nature with respect to magnitude and direction. However, the piston along with connecting rod and crankshaft illustrate respective reciprocating and rotating system of components. the dynamic load and rotating system exerts repeated bending and shear stress due to torsion, which are common stresses acting on crankshaft and mostly responsible for crankshaft fatigue failure. Hence, fatigue strength and life assessment plays an important role in crankshaft development considering its safety and reliable operation. The present paper is based on comparative studies of two crankshafts of fatigue life assessment of a single cylinder diesel engine crankshaft by using High cycle fatigue (HCF) technique
IJERT-Fatigue Life Prediction Of Crankshaft Based On Strain Life Theories
International Journal of Engineering Research and Technology (IJERT), 2012
https://www.ijert.org/fatigue-life-prediction-of-crankshaft-based-on-strain-life-theories https://www.ijert.org/research/fatigue-life-prediction-of-crankshaft-based-on-strain-life-theories-IJERTV1IS8139.pdf Fatigue analysis can be performed using one of the three basic methodologies such as stress-life theory, strain-life theory, and crack growth approach. These techniques are developed to determine the number of cycles to failure. Stress-life theory suitable when elastic stresses and strains are considered. However, for the components having nominal cyclic elastic stresses and plastic deformation, local strain-life theory is used for predicting the fatigue life. In the present work, fatigue behaviour of forged steel crankshaft, subjected to fully reversible cyclic loading, is analyzed using the strain-life theories. The analyses are aimed to identify the critical location through Finite Element Fatigue Analysis (FEFA) and, to predict the fatigue life of crankshaft. The modelling of crankshaft is carried out in parametric Pro/Engineer software whereas ANSYS workbench is used for the Finite Element Analysis (FEA). Maximum Von Mises stresses criterion is used for predicting the failure of crankshaft. Fillet area at crankpin is identified critical where stresses generated exceed the elastic limit. It is observed that Coffin-Manson strain-life theory is found to be conservative compared to Morrow and Smith-Watson-Topper (SWT) strain-life theories.
IJERT-Evaluating Design of the Automotive Crankshaft for Fatigue Life using Finite Element Method
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/evaluating-design-of-the-automotive-crankshaft-for-fatigue-life-using-finite-element-method https://www.ijert.org/research/evaluating-design-of-the-automotive-crankshaft-for-fatigue-life-using-finite-element-method-IJERTV3IS090326.pdf The project is about the study of static and Fatigue analysis of crankshaft. Crankshaft is most complicated and highly strained engine part, which converts the sliding motion of the piston to a rotary motion by slider crank mechanism. Crankshaft is subjected to cyclic bending and torsional loads due to gas pressure and inertial forces. Due to these forces crankshaft is subjected to bending and torsional stresses with high stress concentration at crankpin fillet and journal bearing fillet. There for it is necessary to study the crankshaft for static and Fatigue analysis. The crankshaft Fatigue and Static analyzed is carried out using commercial FEA software.
Evaluating Design of the Automotive Crankshaft for Fatigue Life using Finite Element Method
2014
The project is about the study of static and Fatigue analysis of crankshaft. Crankshaft is most complicated and highly strained engine part, which converts the sliding motion of the piston to a rotary motion by slider crank mechanism. Crankshaft is subjected to cyclic bending and torsional loads due to gas pressure and inertial forces. Due to these forces crankshaft is subjected to bending and torsional stresses with high stress concentration at crankpin fillet and journal bearing fillet. There for it is necessary to study the crankshaft for static and Fatigue analysis. The crankshaft Fatigue and Static analyzed is carried out using commercial FEA software.
Model of Fatigue Life Degradation of Crankshaft
2018
This article is dedicated to modeling and simulation of fatigue degradation of crankshaft. In this article is discussed model of crankshaft which is damaged during its service life. Specially authors consider in their work the fatigue damage influenced by the vibration during traffic. The fatigue damage is considerable problem in engineering and can cause catastrophic accidents, also this accidents can caused fatal injury of personnel. The crankshafts are subjected to the intensive multiaxial loading during its working life and crankshaft failure is much more frequent cause of the accident, during the engine service parts except cylinder rupture. Therefore great effort is devout to the fatigue resistance improvement and proper method of fatigue life modeling. In recent work, relatively new approach for fatigue crack modeling is discussed and its application on specific problem of crankshaft in four cylinder engine. Experimental part of this study is based on measurement of vibration...