Structural Tali timber (Erythrophleum ivorense A. Chev., Erythrophleum suaveolens Brenan.): Assessment of strength and stiffness properties using visual and ultrasonic methods

Martitegui, Francisco Arriaga; Íñiguez, Guillermo; Esteban, Miguel; Seco, Juan Ignacio Fernández-Golfín

doi:10.1007/s00107-006-0100-5

Cited by 25 publications

(10 citation statements)

References 2 publications

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“…Some research groups have studied Spanish timber species during the last decades (Arriaga et al 2005, Arriaga et al 2006, Hermoso et al 2007, Esteban et al 2007). …”

Section: Nondestructive Wave-based Techniquesmentioning

confidence: 99%

Influence of moisture content on the wave velocity to estimate the mechanical properties of large cross-section pieces for structural use of Scots pine from Spain

Montero

Mata

Esteban

et al. 2015

Maderas, Cienc. tecnol.

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The aim of this research is to evaluate the influence of the moisture content of wood on stress wave velocity, as a nondestructive technique for estimating the mechanical properties of gross cross-section Spanish Scots pine (Pinus sylvestris) lumber for structural use. 26 100 x 150 x 3000 mm pieces from Segovia, Spain, were tested with different moisture content values, from 35,5 to 9%. Measurements of longitudinal stress wave velocity were carried out during the natural drying process by using three commercial portable devices based on ultrasonic, acoustic and vibrational techniques. The results can be summarized as three percentage points of decreasing velocity per percentage point of increased wood moisture content in the range from 11,8 to 21,4%: 0,48% for ultrasonic, 0,50% for acoustic wave and 0,65% for longitudinal vibration.

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“…Some research groups have studied Spanish timber species during the last decades (Arriaga et al 2005, Arriaga et al 2006, Hermoso et al 2007, Esteban et al 2007). …”

Section: Nondestructive Wave-based Techniquesmentioning

confidence: 99%

Influence of moisture content on the wave velocity to estimate the mechanical properties of large cross-section pieces for structural use of Scots pine from Spain

Montero

Mata

Esteban

et al. 2015

Maderas, Cienc. tecnol.

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“…6), the relationships with other characteristics being weak, except with each other, which is moderate (r = 0.63). In investigating the relationships between strength and ultrasound velocities Arriaga et al (2006) found that a weak correlation between them occurred due to local defects having more influence on strength than the general quality of specimens. In that way the results from this research may be explained.…”

Section: Resultsmentioning

confidence: 99%

“…For wood measurement the most favourable frequency range is between 20 kHz and 500 kHz because of the high attenuation of ultrasonic waves in wood at higher frequencies (ASTM 494-89 1989;Tanasoiu et al 2002). The length of the piece has more influence on the velocity than the cross-sectional area (Arriaga et al 2006). The longitudinal measurement is strongly and continuously affected by the width (b) over thickness (h) ratio of the specimen.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Physical-Mechanical Properties of Timber Using Ultrasound Examination

Teder

Pilt

Miljan

et al. 2012

Journal of Civil Engineering and Management

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Abstract. This research uses a non-destructive method -ultrasound -to examine timber, combining the results of measurement with the properties of strength and stiffness. The purpose of this work is to explore the possibilities of grading wood structure in situ using ultrasound measurements, specifically, the moisture content and density of the timber. The timber used in these experiments was taken from existing buildings of different ages. The potential of replacing direct measurements with indirect measurements by ultrasound was also investigated. The physical-mechanical properties of wood were determined in laboratory conditions according to standard practices, and the method of non-destructive measurements was based on a commercial test device based on 54 kHz compressional wave 50 mm diameter ultrasound transducers. Direct measurements were performed in the longitudinal and radial material directions. Indirect measurements were performed with transducers positioned on the same lateral surface of the sample. A weak correlation was found within the different measurements. Longitudinal measurements characterise bending strength with R 2 = 0.18 and modulus of elasticity with R 2 = 0.37. In multiple regression analysis, stronger correlations were found; prediction equations of bending strength and modulus of elasticity were found with R 2 = 0.40 and R 2 = 0.81, respectively.Keywords: acoustic measurement, bending strength, modulus of elasticity, density, moisture content, speed of sound, direct and indirect methods.

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“…swellings, parasitic worms, emesis and as laxative [22,23]. It has a high economic and sociocultural value.…”

Section: International Journal Of Pharmacology Phytochemistry and Etmentioning

confidence: 99%

Cytotoxic and Antibacterial Assessment of Stem-Barks of <i>Feretia apodanthera</i> and <i>Erythrophleum ivorense</i>; Two West African Medicinal and Socio-Economic Trees

Njimoh

Taïwé

Dinga

et al. 2018

IJPPE

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To assess the antibacterial and cytotoxic properties of stem-barks of Feretia apodanthera and Erythrophleum ivorense extracts from powdered stem-barks of Feretia apodanthera and Erythrophleum ivorense were prepared following standard techniques of marceration, filtration and evaporation. Antibacterial activity was assayed against five pathogenic bacteria strains by the well-diffusion and broth microdilution methods. Cytotoxicity was measured by acute toxicity test on female albino rats and confirmed by cell viability assay using 3T3 cell lines. Phytochemical analysis was performed following standard techniques. The aqueous/alkaloid extracts of Feretia apodanthera and the ethanol extract of Erythrophleum ivorense were active against the five pathogenic bacteria strains tested (diameter zone of inhibition (DZI) ranging from 5.1 to 17.8mm). The Feretia apodanthera extracts were the most active against Staphylococcus aureus (DZI 17.1-17.8mm). The MIC and MBC of the extracts of both plants ranged from 0.094mg/ml to 48mg/ml and 0.047mg/ml to 48mg/ml respectively. Extracts of Feretia. apodanthera at 5000mg/Kg had no effect on the behavioural properties of rats and no death was observed. Incubation with 3T3 cell lines did not produce any cell toxicity up to 20mM and 5mM respectively for the aqueous extract and the alkaloid fraction. Incubation with higher concentrations produced cell death with IC50 of 39.41 ± 0.95mM and 38.45 ± 1.64mM respectively. Phytochemical analysis revealed the presence of various constituents. The results show for the first time that stem-bark extracts of F. apodanthera and E. ivorense possess antibacterial activities against common human pathogenic bacteria and the low/lack of toxicity as demonstrated with the F. apodanthera extracts justify and confirm their safe ethnomedical uses.

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Structural Tali timber (Erythrophleum ivorense A. Chev., Erythrophleum suaveolens Brenan.): Assessment of strength and stiffness properties using visual and ultrasonic methods

Cited by 25 publications

References 2 publications

Influence of moisture content on the wave velocity to estimate the mechanical properties of large cross-section pieces for structural use of Scots pine from Spain

Influence of moisture content on the wave velocity to estimate the mechanical properties of large cross-section pieces for structural use of Scots pine from Spain

Investigation of the Physical-Mechanical Properties of Timber Using Ultrasound Examination

Cytotoxic and Antibacterial Assessment of Stem-Barks of <i>Feretia apodanthera</i> and <i>Erythrophleum ivorense</i>; Two West African Medicinal and Socio-Economic Trees

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