J. Ayarkwa, Y. Hirashima, K. Ando, Y. Sasaki
Monitoring Acoustic Emissions from Finger-Joints
from Tropical African Hardwoods for Predicting Ultimate Tensile Strength
Summary
The patterns of acoustic emissions generated during tension test of finger-joints from three tropical
African hardwoods, Obeche (Triplochiton scleroxylon), Makore (Tieghemella heckelii) and Moabi (Baillonella
toxisperma) were evaluated to assess their potential usefulness for non-destructively predicting
ultimate tensile strength. The acoustic emission patterns generated were observed to differ depending on
the type of finger profile and the wood species. Regression coefficients from cumulative acoustic emission
count versus applied stress squared functions also varied with the profile and species type. When
ultimate tensile strength was correlated with these regression coefficients, for stresses applied up to 50%
of mean ultimate strength, the logarithmic regression model developed could predict finger-joint strength
accurate to ±12%, ±13% and ±18% for Obeche, Makore and Moabi, respectively. The model was also
sensitive to the type of finger profile used for all three tropical African hardwoods.
The results indicate that this acoustic emission monitoring procedure could be useful for non-destructively
predicting ultimate tensile strength of finger-joints from the three tropical African hardwoods.
Holzforschung, Walter de Gruyter
Print ISSN: 0018-3830
Volume: 55, 11/2001
Pages: 652 - 660
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