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Transversely isotropic mechanical properties of PVC foam under cyclic loading

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Abstract

Cyclic material tests were done on Divinycell PVC H100 foam to obtain out-of-plane and in-plane compression and shear material properties after foam yielding. The compression and shear stress–strain behaviors were very similar to each other except that a plateau (flow) stress occurred after yielding in compression, while the foam underwent mild strain hardening after shear yielding. The ratio of out-of-plane to in-plane stiffness and yield strength for the PVC H100 was found to be approximately 3/2 in both the compression and shear modes. After viscoplastic yielding, the foam underwent permanent damage and exhibited hysteresis, mainly in the form of viscoelasticity. Damage that occurred in the foam after it yields followed the pattern of Mullins damage, i.e., the damage was essentially fixed at a given strain amplitude, and more damage occurred with increasing the strain amplitude. Hysteresis was much more pronounced as the damage grew, suggesting that viscoelastic properties of the foam could be changing with the amount of damage.

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Acknowledgements

This study was supported in-part from the Office of Naval Research under Grant N00014-11-1-0485. The authors would like to acknowledge Dr. Yapa D. S. Rajapakse, Solid Mechanics Program Manager at the Office of Naval Research, for making this study possible. The authors would also like to thank Mr. Dale Ertley for his help in designing and building the shear test fixture.

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  1. Department of Mechanical Engineering, The University of Akron, Akron, OH, 44325-3903, USA

    Linling Chen & Michelle S. Hoo Fatt

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  1. Linling Chen
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  2. Michelle S. Hoo Fatt
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Correspondence to Michelle S. Hoo Fatt.

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Chen, L., Hoo Fatt, M.S. Transversely isotropic mechanical properties of PVC foam under cyclic loading. J Mater Sci 48, 6786–6796 (2013). https://doi.org/10.1007/s10853-013-7483-6

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