Ultrasonic testing and evaluation of moisture-dependent elastic properties of fir wood

YILMAZ AYDIN T., Kucukkose A.

Materialpruefung/Materials Testing, vol.62, no.10, pp.1059-1064, 2020 (SCI-Expanded, Scopus) identifier

  • Publication Type: Article / Article
  • Volume: 62 Issue: 10
  • Publication Date: 2020
  • Doi Number: 10.3139/120.111585
  • Journal Name: Materialpruefung/Materials Testing
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex
  • Page Numbers: pp.1059-1064
  • Keywords: Elastic constants, Fir wood, Mechanical properties, Moisture dependence, Ultrasound
  • Isparta University of Applied Sciences Affiliated: Yes

Abstract

With respect to their relevance for wood-related technologies, moisturedependent elastic engineering parameters of Taurus fir (Abies Cilicica (Antoine et Kotschy) Carriere) are determined from ultrasound longitudinal (2.3 MHz) and shear (1 MHz) wave velocities. The dynamic Young's and shear modules of characteristic axes and planes decrease significantly down to 17 % at increased moisture content due to decreased wave velocities. Moisture-dependent R2 values of the modules range from 0.88 to 0.99. However, Poisson's ratios exhibit inconsistent moisture dependent behavior. Remarkable differences between ultrasound findings and the published results from compression tests are observed. Generally, the elastic values of wood from ultrasonic testing are reported higher than from mechanical tests. In contrast we find lower values as well. The critical issue of different ultrasound velocity sensitivity at selected directions is highlighted.