title: Remarks on residual stress measurement by hole-drilling and electronic speckle pattern interferometry.
abstract: Hole drilling is the most widespread method for measuring residual stress. It is based on the principle that drilling a hole in the material causes a local stress relaxation; the initial residual stress can be calculated by measuring strain in correspondence with each drill depth. Recently optical techniques were introduced to measure strain; in this case, the accuracy of the final results depends, among other factors, on the proper choice of the area of analysis. Deformations are in fact analyzed within an annulus determined by two parameters: the internal and the external radius. In this paper, the influence of the choice of the area of analysis was analysed. A known stress field was introduced on a Ti grade 5 sample and then the stress was measured in correspondence with different values of the internal and the external radius of analysis; results were finally compared with the expected theoretical value.
authors.affiliation: Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Viale Japigia 182, 70126 Bari, Italy.
authors.forename: Claudia
authors.identifier: 0000-0002-8682-6078
authors.initials: C
authors.lastname: Barile
authors.affiliation: Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Viale Japigia 182, 70126 Bari, Italy.
authors.forename: Caterina
authors.identifier: 0000-0002-2378-2186
authors.initials: C
authors.lastname: Casavola
authors.affiliation: Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Viale Japigia 182, 70126 Bari, Italy.
authors.forename: Giovanni
authors.identifier: 0000-0001-6257-5721
authors.initials: G
authors.lastname: Pappalettera
authors.affiliation: Dipartimento di Meccanica, Matematica e Management, Politecnico di Bari, Viale Japigia 182, 70126 Bari, Italy.
authors.forename: Carmine
authors.identifier: 0000-0003-4253-1347
authors.initials: C
authors.lastname: Pappalettere
mesh_terms: D000465:Algorithms; D004581:Electronics / Q000295:instrumentation / Q000379:methods*; D007368:Interferometry / Q000295:instrumentation / Q000379:methods*; D008962:Models, Theoretical; D015203:Reproducibility of Results; D013314:Stress, Mechanical