Williams' expansion-based approximation of the displacement field in an Al 2024 compact tension specimen reconstructed from optical measurements

0495748 - ÚFM 2019 RIV US eng J - Journal Article
Seitl, Stanislav - Malíková, Lucie - Růžička, V. - Moreno, B. - Lopez-Crespo, P.
Williams' expansion-based approximation of the displacement field in an Al 2024 compact tension specimen reconstructed from optical measurements.
Fatigue and Fracture of Engineering Materials and Structures. Roč. 41, č. 10 (2018), s. 2187-2196. ISSN 8756-758X. E-ISSN 1460-2695.
[IJFatigue and FFEMS Joint Workshop on Characterisation of Crack Tip Fields /4./. Bonifacio, 10.04.2018-12.04.2018]
R&D Projects: GA ČR GA17-01589S
Institutional support: RVO:68081723
Keywords : digital image correlation * hybrid crack element * tip asymptotic field * higher-order terms * mixed-mode cracks * fracture-mechanics * stress intensity * coefficients * plasticity * closure * crack tip fields * dic * displacement field reconstruction * higher-order terms * multi-parameter approximation * optical measurements * Williams power series
OECD category: Audio engineering, reliability analysis
Impact factor: 2.555, year: 2018

A study on the approximation of the displacement field in the vicinity of a crack tip in a compact tension specimen made from Al 2024-T351 is presented. Components of displacements vector are expressed using the linear elastic fracture mechanics theory via Williams' power series multi-parameter formulation. Determination of the coefficients of the terms of this series is performed using a least squares-based regression technique known as over deterministic method for which displacements data obtained experimentally via optical measurements are taken as inputs. The displacement fields reconstructed are discussed, and several conclusions are drawn regarding the number of the Williams' power series terms considered and the region where the displacement are investigated.
Permanent Link: http://hdl.handle.net/11104/0288676