Hole Drilling Residual Stress Evaluations in Cast Iron

Hole Drilling Residual Stress Evaluations in Cast Iron

M. Lundberg, L. Elmquist

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Abstract. Incremental hole drilling for residual stress measurement are widely used in industry today and is considered to be a cheap and fairly reliable method for stress measurements. Even though the method assumes isotropic material, it has been expanded to orthotropic materials such as composite laminates. With heterogeneous material like grey cast iron, the reliability and accuracy of the method still often fails to provide residual stress data valid for analysis. Cast iron microstructural aspects that complicate the analysis are the graphite and its morphology, variations in matrix structures and casting defects. These features can extend over different length scales and give cast iron highly localised mechanical properties. Global engineering parameters, such as Young’s modulus and Poisson’s ratio, are used together with the locally measured strains to calculate the residual stresses. Utilizing global material parameters while measuring locally can provide false stress results. Grey cast iron exhibits a non-linear elastic behaviour and the Young’s modulus can change significantly and can therefore result in very different calculated residual stresses. Experiments were conducted on cast stress lattices utilizing incremental hole drilling to measure strains. To calculate the residual stresses, global material parameters and standard evaluation procedures in accordance to ASTM E837 were used. Results show that the method is questionable for grey cast iron but can be used for ductile iron. Lack of material properties knowledged are suggested to be the main obstacle for residual stress evaluations on grey cast iron as the accuracy of the method decreases as hole depth approaches 1 mm.

Incremental Hole Drilling, Residual Stresses, Grey Cast Iron, Ductile Iron

Published online 9/11/2018, 6 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: M. Lundberg, L. Elmquist, ‘Hole Drilling Residual Stress Evaluations in Cast Iron’, Materials Research Proceedings, Vol. 6, pp 89-94, 2018

DOI: http://dx.doi.org/10.21741/9781945291890-15

The article was published as article 15 of the book Residual Stresses 2018

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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