Stress-strain state analysis and fatigue prediction of D16T alloy in the stress concentration zone under combined tension-torsion load

Engineering machines and components are prone to structural failures during their service time due to certain technical reasons and also due to some unforeseen circumstances. The technical breakdowns sometime lead to high economic imbalance and can also be fatal to life and property. Predicting the...

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Bibliographic Details
Published in:Mechanika (Kaunas, Lithuania : 1995) Vol. 27; no. 5; pp. 368 - 375
Main Authors: SOLOMON, Isaac, NARVYDAS, Evaldas, DUNDULIS, Gintautas
Format: Journal Article
Language:English
Published: Kaunas Kaunas University of Technology 12.10.2021
Kauno Technologijos Universitetas
Subjects:
Aerospace industry
Alloys
Aluminum base alloys
Breakage
Computer simulation
Crack tips
Cyclic loads
Elastic deformation
Failure
Fatigue
Fatigue cracks
Fatigue failure
Fatigue testing machines
Fatigue tests
Finite element method
Materials
Mathematical models
Mechanical properties
Metal fatigue
Numerical methods
Physical properties
Strain analysis
Strength to weight ratio
Stress concentration
Stress-strain relationships
Structural failure
Weight reduction
Yield stress
Fatigue
Tension
Aluminium
Torsion
Stress
Failure
ISSN:1392-1207, 2029-6983
Online Access:Get full text
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Summary:Engineering machines and components are prone to structural failures during their service time due to certain technical reasons and also due to some unforeseen circumstances. The technical breakdowns sometime lead to high economic imbalance and can also be fatal to life and property. Predicting the failure and evaluating the breakage characteristics of engineering components are crucial in determining the life of the component and also increase their maintenance and safety in daily life. This research study deals with the modelling and numerical simulations of an aluminium alloy specimen in 3D stress-state and thereby predicting the fatigue failure of the material subjected to external cyclic loadings. To predict the failure of a component, a specimen with an induced crack can be evaluated through cyclic loading process. It is based on the fact that the presence of a cracks tends to modify the stresses present locally on the component that the elastic deformation and the stresses attributed with them are totally insufficient for the design against fracture. It is based on the assumption that the specimen undergoes complete fracture when the crack reaches its critical size even though the stress at the critical crack tip is much lower than the yield stress of the component. The critical size of the crack is based on the application of the load and the number of load cycles it undergoes. The main aim of this research is to present and validate the numerical method for the study of the influence of cracks present in the engineering components. Finite element method was applied for numerical simulation. In this study the tension, torsion, combined tension-torsion and fatigue loads was applied. The experimental testing data of mechanical properties was used in numerical simulation as input data. This research study investigates the three-dimensional stress-strain state and fatigue prediction of D16T aluminium alloy which is predominantly used in the aerospace and automobile industries for their high strength-to-weight ratio and much better physical properties. The different specimen models are then analysed and the most efficient one was selected for the preliminary experimental tests.
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ISSN:1392-1207
2029-6983
DOI:10.5755/j02.mech.28454