By Anarkia333 |
2010
6

Spruce specimen were tested in compression in the transverse plane with annual rings inclined in different angles to the loading direction. Strains were measured using Digital Speckle Photography (DSP) and average strain values from the central portion of the specimen was used to determine modulus as a function of the loading angle. Radial modulus, ER , was found to be 1.6 GPa, tangential modulus, ET , was 0.54 GPa and, GRT , is 57 MPa. The strength in the radial direction is about 5 MPa and the tangential strength is 6.5 MPa. The lowest offaxis strengths are in the range of 3-4 MPa.