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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1282

Title: Predicting ultimate tensile and bending strengths of three finger-jointed tropical African hardwoods using acoustic emissions
Authors: Ayarkwa, J.
Hirashima, Y.
Ando, K.
Sasaki, Y.
Issue Date: Nov-2000
Publisher: Southern African Forestry Journal
Citation: Southern African Forestry Journal, No. 189
Abstract: The acoustic emissions behaviour of finger joints from three tropical African hardwoods, Obeche (Triplochiton scleroxylon), Makore (Tieghemella heckelii) and Moabi (Baillonella toxisperma) were examined with a view to establishing their potential usefulness for non-destructively predicting ultimate tensile and bending strengths. Stress at first acoustic emission event-count as well as the cumulative event-count at 80 percent of mean failure stress and the cumulative event-count at 80 percent of mean proportional limit stress for all specimens were separately correlated to finger joint strengths. The correlation suggested that all three acoustic emission properties could be used to non-destructively predict the ultimate tensile and bending strengths of finger joints from the three hardwoods. Correlation coefficients obtained for the prediction models developed were, generally, good and statistically significant (a = 0.05). Stress at first event-count seemed best correlated to ultimate tensile strength of finger joints from the three species, whilst cumulative event-count at 80 percent of mean failure stress was best correlated to modulus of rupture. A logarithmic regression function seemed to fit-the regression of acoustic emission event-counts on ultimate tensile strength and modulus of rupture better than a linear function. The acoustic emission technique seems applicable as a non-destructive testing method for predicting the tensile and bending strengths of finger joints from the three tropical African hardwoods.
Description: This article was published by Southern African Forestry Journal in 2000
URI: http://hdl.handle.net/123456789/1282
Appears in Collections:College of Architecture and Planning

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