Abstract
The sandwich plate twist test method involves torsion loading of a panel by application of concentrated loads at two diagonally opposite corners and supporting the panel at the other two corners. Compliance measured in this test can be used to extract the shear moduli of monolithic, composite and sandwich plates, and it may also be employed for determination of the twist stiffness, D 66 . Previous studies of the plate twist specimen have shown that classical laminated plate theory does not adequately predict the compliance of sandwich panels with a low density/modulus core, as a result of transverse shear deformation. This work proposes a “shear-corrected” model for accurate prediction of the plate twist compliance by incorporation of the transverse shear stiffnesses of the core. This model was used to extract the transverse shear modulus of a range of low density PVC foam cores from the measured panel twist compliance. Good agreement with published PVC foam core shear modulus values was obtained.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Tsai SW (1965) Experimental determination of the elastic behavior of orthotropic plates. J Eng Ind 63:315–318
Mure M (1986) Corrugated board a new method: anticlastic rigidity, (in French). Rev A T I P 40:325–330
Farshad M, Flüeler P (1998) Investigation of mode III fracture toughness using an anti-clastic plate bending method. Eng Fract Mech 60(5–6):597–603
Vinson JR (1997) In-plane shear strength determination of composite materials in laminated and sandwich plates. Appl Mech Rev 50:5237–5240
Aviles F, Carlsson LA, Browning G, Millay K (2009) Investigation of the sandwich plate twist test. Exp Mech 49(6):813–822
Allen HG (1969) Analysis and design of structural sandwich panels. Pergamon, Oxford
Whitney JM (1987) Structural analysis of laminated anisotropic plates. Lancaster, Technomic
Hyer MW (1998) Stress analysis of fiber-reinforced composite materials. WCB/McGraw-Hill, Boston
Lekhnitskii SG (1968) Anisotropic plates. Gordon & Breach Publishers
ASTM Standard D3044–94 (2000) Standard test method for shear modulus of wood-based structural panels. ASTM, West Conshohocken
Zenkert D (1997) An introduction to sandwich construction. EMAS, London
Frostig Y, Baruch M, Vilnay O, Shelnman I (1992) High-order theory for sandwich-beam behavior with transversely flexible core. J Eng Mech 118(5):1026–1043
Wang CM, Reddy JN, Lee KH (2000) Shear deformable beams and plates. Elsevier, Oxford
Birman V, Bert CW (2002) On the choice of shear correction factor in sandwich structures. J Sandwich Struct Mater 4:83–95
ANSYS 8.1 (2004) Swanson Analysis Systems, Houston, PA,USA
DIAB Divinycell, Technical Specification, Divinycell International, DeSoto, TX, USA
ASTM Standard C273 (2000) Standard test method for shear properties of sandwich core materials. ASTM, West Conshohocken
Acknowledgements
The authors gratefully acknowledge assistance of Fernando Couoh for running parametric FEA.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Avilés, F., Carlsson, L.A. & May-Pat, A. A Shear-Corrected Formulation for the Sandwich Twist Specimen. Exp Mech 52, 17–23 (2012). https://doi.org/10.1007/s11340-011-9501-4
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11340-011-9501-4