The Effect of the Free Surface on the Singular Stress Field at the Fatigue Crack Front

Tomáš Oplt; Pavel Pokorný; Luboš Náhlík; Pavel Hutař

doi:10.1515/scjme-2017-0019

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The Effect of the Free Surface on the Singular Stress Field at the Fatigue Crack Front

Strojnícky časopis - Journal of Mechanical Engineering

Volume 67 (2017): Issue 2 (November 2017)

By: Tomáš Oplt, Pavel Pokorný, Luboš Náhlík and Pavel Hutař

Open Access

|Nov 2017

Abstract

Description of stress singularity in the vicinity of a free surface is presented. Its presence causes the retardation of the fatigue crack growth in that region and fatigue crack is being curved. Numerical model is used to study dependence of the stress singularity exponent on Poisson’s ratio. Estimated values are compared to those already published. Experimentally measured angles of fatigue crack on SENB specimens confirm the relation between Poisson’s ratio and the angle between crack front and free surface.

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Articles in this issue

DOI: https://doi.org/10.1515/scjme-2017-0019 | Journal eISSN: 2450-5471 | Journal ISSN: 0039-2472

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Language: English

Page range: 69 - 76

Published on: Nov 18, 2017

Published by: Slovak University of Technology in Bratislava

In partnership with: Paradigm Publishing Services

Publication frequency: 2 issues per year

Keywords:

fatigue crack,

stress singularity exponent,

vertex singularity,

crack front shape

Related subjects:

Engineering,

Mechanical engineering,

Fundamentals of mechanical engineering,

Mechanics

© 2017 Tomáš Oplt, Pavel Pokorný, Luboš Náhlík, Pavel Hutař, published by Slovak University of Technology in Bratislava
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Volume 67 (2017): Issue 2 (November 2017)