Tensile Strain Measurement Using Mechanical and in Situ Optical Techniques in Bi-metallic Ni-base Superalloys
The mechanical performance in terms of tensile properties of a nickel-base superalloy bi-material was investigated, to
study the tensile strength of the joint. The results of strain measurement and control by means of usual clip-on extensometry,
which gives the overall strain, cannot reveal the local deformation. To have more detail about the local strain fields,
particularly in the vicinity of the interface which remains the most brittle part of the bi-metal, an in situ image capture and
processing technique adapted from particle image velocimetry was used. The two techniques showed a perfect correlation
with the peculiarity of a precise assessment of the local strain in the case of the optical method. Tensile curves obtained at
constant strain rate showed serrated yielding associated with inhomogeneous plastic flow at high temperatures. This instability
of strain rate softening type (strain localization) was well detected by means of the optical technique.
ABBADI Mohammed;
DE HAAN Fredericus;
HAEHNER Peter;
2008-01-25
ELSEVIER SCI LTD
JRC40881
0263-2241,
https://publications.jrc.ec.europa.eu/repository/handle/JRC40881,
10.1016/j.measurement.2006.06.019,
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