Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Comparison of methods for assessing material properties from spherical indentation test on three types of steel
Submission Author:
Saint Clair Alves Naves , MG
Co-Authors:
Saint Clair Alves Naves, Henry Hwang, Luiz Fernando Maia de Almeida, Luciano José Arantes, Pedro Augusto Queiroz de Assis
Presenter: Luciano José Arantes
doi://10.26678/ABCM.COBEM2023.COB2023-0128
Abstract
To reduce the costs associated with the conventional tensile test, the Instrumented Spherical Indentation Test (ISIT) can be adopted. The ISIT consists of applying a controlled force through a spherical probe on the material’s surface while measuring the resulting penetration depth. From these data, different analysis methods for characterizing mechanical properties of materials were developed in the past and, more recently, optimization based approaches were also proposed. In this context, the main objective of the present paper is to compare the results obtained with classical analysis methods (specifically Haggag’s method and ISO/TR29381) with a recent proposal (Yu’s method) for three common types of steel (4340 28HRC, 4340 40HRC and 4130M 25 HRC). In particular, the accuracy in determining the yield stress σy, the ultimate tensile strength σUT S and the strain hardening parameter n is analysed. The results showed that¸ for the considered materials, Yu’s method can produce more accurate values for σy with an error between 2.5% and 4.3%. However, for the determination of n, the classical Haggag’s method was more consistent, with an error of 3.1%. Lastly, all investigated methods resulted on adequate estimates for σUT S meanwhile, with a maximum error of 6.5%, the ISO method proved to be the most consistent among the others. These results can help the choice of an appropriate method for analysing ISIT results for steels depending on the property of interest.
Keywords
Mechanical Properties, Strain Hardening, Strength Coefficient, Spherical Indentation, Yield-stress
