On the Torsion Method for Measurement of Out-Of-Plane Shear Properties, 19PaperCon

The use of torsional loading for measurement of out-of-plane shear properties in paperboards and liners is uncommon. Three decades ago, Waterhouse et al. [1] applied this method to determine the moduli of paperboards. However, the test method has not been widely implemented beyond this study. One reason is due to the inability of the method to resolve the anisotropy of shear properties in the through-thickness direction. However, if the anisotropy in the out-of-plane directions is insignificant (which is often the case for out-of-plane shear moduli), the torsional loading provides an excellent option for overcoming post-peak instability. Furthermore, torsional loading can also provide a straightforward way of introducing out-of-plane normal loads for combined loading scenarios. In this study, we demonstrate the feasibility of the torsional test method as a means of measuring out-of-plane shear properties and in particular, obtaining a stable post-peak unloading behaviour. We find an order of magnitude agreement between the torsional test method and the rigid block shear test. 

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Author: Prashanth Srinivasa; Mikael Nygårds; Anton Hagman; Samuel A. Pendergraph; and Jonas Sundström
On the Torsion Method for Measurement of Out-Of-Plane Shear
On the Torsion Method for Measurement of Out-Of-Plane Shear Properties, 19PaperCon

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