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ESPI Measurements of Strain on a CFRP‐Reinforced Bending Beam 1
Author(s) -
Hack E.,
Schumacher A.
Publication year - 2007
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/j.1475-1305.2007.00339.x
Subject(s) - electronic speckle pattern interferometry , materials science , beam (structure) , displacement (psychology) , structural engineering , finite element method , bending , decorrelation , speckle pattern , fibre reinforced plastic , carbon fiber reinforced polymer , composite material , interferometry , optics , reinforced concrete , engineering , physics , computer science , psychology , algorithm , psychotherapist
This paper presents 3D electronic speckle pattern interferometry (ESPI) measurement results of strain components at the end of a carbon‐fibre reinforced polymer (CFRP) plate adhesively bonded to a reinforced concrete beam. To minimise speckle decorrelation because of the inevitable rigid‐body motion of the measured specimen, the load was increased in small increments. Two evaluation schemes are compared: the step‐by‐step addition of the measured displacement components and regain of the correlation by image shifting. Strain is evaluated by interpolating the in‐plane displacement measurements along selected lines, and is compared with results from finite element analysis (FEA). An uncertainty estimate is given.