Fatigue Tests of Un-Notched and Notched Specimens and Life Prediction Using a Variable Critical Distance Method

Carpenter, Neeraj; Jha, Pankaj Kumar; Ray, Sudipto; Nienhuis, Michael D.

doi:10.4271/2019-01-0801

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…However, in the field of automotive industry some research activities are devoted to Variable Critical Distance Methods, 84 providing promising results in the field of automotive components design.…”

Section: Critical Distance Estimationmentioning

confidence: 99%

Theory of critical distances: A discussion on concepts and applications

Delprete

Maggio

Sesana

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Theory of Critical Distances (TCD) collects several methods adopted in failure prediction of components provided with stress concentration features. The idea of evaluating stress effect in a zone rather than in a single point was proposed decades ago but, only thanks to relatively recent works, TCD concepts showed to be a successful extension of Linear Elastic Fracture Mechanics (LEFM), able to assess strength and fatigue life. The increasing computational power has made Finite Element Method (FEM) widespread, hence stress fields can be easily extracted and used as input data for fatigue post-processing and durability analyses. In this scenario, TCD reveals as a powerful tool which, thanks to the introduction of a single material parameter (critical distance, [Formula: see text]), integrates classical fracture models by considering the presence of microscale phenomena acting in fracture process. In this sense, TCD behaves as a link between continuum mechanics and LEFM. Modalities and reasons for this connection to occur are interesting points of further investigations. Literature on TCD and its theoretical-experimental background is quite extended, nevertheless few industrial applications are available in literature to the best of authors’ knowledge. In this paper, an overview of concepts and applications related to TCD are reported highlighting the relevance of theoretical arguments in actual applications.

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Section: Critical Distance Estimationmentioning

confidence: 99%

Theory of critical distances: A discussion on concepts and applications

Delprete

Maggio

Sesana

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Low cycle fatigue prediction for cylinder heads considering stress gradient and local yielding

Ashouri

2024

Proceedings of the Institution of Mechanical Engineers, Part D:

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Due to the complex geometry and thermo-mechanical loading, cylinder heads is the most challenging parts among all parts engines. It must endure cyclic thermo-mechanical stresses throughout their lifetime. In this paper, the low cycle fatigue (LCF) life analysis of the cylinder heads considering the stress gradient and local yielding, is performed using the finite element method and ANSYS software to predict the temperature and stresses, and then, LCF life using Morrow theory and nCode Design Life software. Elastic and plastic properties of cylinder heads obtained by LCF tests at different temperatures. The results of finite element analysis (FEA) showed that the maximum temperature and stress values in the cylinder heads are 220.29°C and 89.868 MPa and the position is at the valve bridge between exhaust valves. The numerical results showed that bridge between exhaust valves and valve seats are areas susceptible to fatigue cracks. The LCF life results showed that 1073 cycles is the minimum fatigue life and occurs between exhaust valves. 400-h durability test showed no rupture in different parts of the cylinder heads.

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High Cycle Fatigue Prediction for Cylinder Head Considering Stress Gradient

Ashouri

2023

Mech. Solids

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Fatigue Tests of Un-Notched and Notched Specimens and Life Prediction Using a Variable Critical Distance Method

Cited by 4 publications

References 9 publications

Theory of critical distances: A discussion on concepts and applications

Theory of critical distances: A discussion on concepts and applications

Low cycle fatigue prediction for cylinder heads considering stress gradient and local yielding

High Cycle Fatigue Prediction for Cylinder Head Considering Stress Gradient

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