Measurement of the in-plane shear modulus of medium-density fibreboard by torsional and flexural vibration tests

The in-plane shear modulus (IPSM) of medium-density fibreboard (MDF) was obtained via a torsional vibration (TV) test using the specimen with various configurations and a subsequent numerical analysis. Because the out-of-plane shear modulus (OPSM) of MDF was much lower than the IPSM, the difference between the IPSM and OPSM had to be considered in the TV test. Therefore, the OPSM value was measured from the flexural vibration (FV) tests, and it was applied for the calculation of the IPSM value. The experimental and numerical results indicated that the TV test is effective to obtain the IPSM of MDF accurately under various configurations of the specimen.