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The Young’s modulus and shear modulus of extruded polystyrene foam were obtained by measurements using the longitudinal and flexural vibration methods on specimens with various lengths and performing a subsequent numerical analysis on the test data. In addition to the vibration tests, ISO 844 compression and ASTM C273/C273M-11 shear tests were conducted, and the results were compared with those obtained from the vibration tests. The Young’s modulus values could be measured accurately by the longitudinal and flexural vibration tests while reducing the effects of the specimen configuration. In contrast, the shear modulus value was often dependent on the specimen configuration. The Young’s modulus and shear modulus values obtained from the vibration tests were often higher than those obtained from the standardised tests because the bending of cell wall is not induced in the vibration test. Although a provisional method for reducing the influence of the specimen configuration was proposed based on the numerical results, further research is required to measure the elastic modulus of extruded polystyrene foam accurately.

In this work, the in-plane shear modulus of extruded polystyrene foam was obtained using the torsional vibration and square-plate twist methods on square plate specimens with various lengths and performing subsequent numerical analysis on the test data. Additionally, the ASTM C273/273M-11 simple shear tests were conducted and the results were compared with those obtained from the torsional vibration and squareplate twist methods. The in-plane shear modulus value obtained from the torsional vibration and square-plate twist methods was often dependent on the specimen configuration. Nevertheless, the in-plane shear modulus value could be obtained effectively by introducing a simple correction coefficient determined from the numerical analysis. In contrast, the in-plane shear modulus value obtained from the simple shear test was often lower than those obtained from the torsional vibration and square-plate twist methods.

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