
Proceedings Paper
Monitoring the fracture behavior of SiCp/Al alloy composites using infrared lock-in thermographyFormat | Member Price | Non-Member Price |
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Paper Abstract
his work deals with the study of fracture behavior of silicon carbide particle-reinforced (SiCp) A359 aluminum
alloy matrix composites using an innovative nondestructive method based on lock-in thermography. The heat wave,
generated by the thermo-mechanical coupling and the intrinsic energy dissipated during mechanical cyclic loading of the
sample, was detected by an infrared camera. The coefficient of
thermo-elasticity allows for the transformation of the
temperature profiles into stresses. A new procedure was developed to determine the crack growth rate using
thermographic mapping of the material undergoing fatigue: (a) The distribution of temperature and stresses at the surface
of the specimen was monitored during the test. To this end, thermal images were obtained as a function of time and
saved in the form of a movie. (b) The stresses were evaluated in a post-processing mode, along a series of equally spaced
reference lines of the same length, set in front of the crack-starting notch. The idea was that the stress monitored at the
location of a line versus time (or fatigue cycles) would exhibit an increase while the crack approaches the line, then attain
a maximum when the crack tip was on the line. Due to the fact that the crack growth path could not be predicted and was
not expected to follow a straight line in front of the notch, the stresses were monitored along a series of lines of a certain
length, instead of a series of equally spaced points in front of the notch. The exact path of the crack could be easily
determined by looking at the stress maxima along each of these reference lines. The thermographic results on the crack
growth rate of the metal matrix composite (MMC) samples with three different heat treatments were correlated with
measurements obtained by the conventional compliance method, and found to be in agreement.
Paper Details
Date Published: 8 April 2009
PDF: 12 pages
Proc. SPIE 7294, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2009, 72940X (8 April 2009); doi: 10.1117/12.815207
Published in SPIE Proceedings Vol. 7294:
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2009
H. Felix Wu; Aaron A. Diaz; Peter J. Shull; Dietmar W. Vogel, Editor(s)
PDF: 12 pages
Proc. SPIE 7294, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2009, 72940X (8 April 2009); doi: 10.1117/12.815207
Show Author Affiliations
E. Z. Kordatos, Univ. of Ioannina (Greece)
D, P. Myriounis, Univ. of Ioannina (Greece)
Sheffield Hallam Univ. (United Kingdom)
D, P. Myriounis, Univ. of Ioannina (Greece)
Sheffield Hallam Univ. (United Kingdom)
Published in SPIE Proceedings Vol. 7294:
Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2009
H. Felix Wu; Aaron A. Diaz; Peter J. Shull; Dietmar W. Vogel, Editor(s)
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