On the experimental modelling of delaminations in composite materials. C. Devivier, F. Pierron and M. R. Wisnom. Introduction. Dramatic effects from very small impacts Barely visible impact damage (BVID) caused by tool drops BVID involves delaminations Resulting damage pattern is complex.
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C. Devivier, F. Pierron and M. R. Wisnom
samples with single delaminations
Create a non-destructive evaluation for delaminations
Single layer of PTFE
Spatial phase shifting (windowed discrete Fourier transform)
» 1 picture
unloaded state subtracted to loaded state
» 1 picture
Unwrapping with custom made algorithm.
p: grid pitch
h: distance grid-sample
Out of plane:
Resolution in strains:
h: distance grid-sample (1600 mm)
sf: phase standard deviation (0.01 rad)
dx: pixel size
(1.5 mm inplane
0.7 mm out of plane)
t: specimen thickness (4 mm)
p: grid pitch (1.5 mm)
» Same processing
Thin plate theory