Abstract
In this paper, out-of-plane compression of criss-cross composite materials, i.e. materials with ply stacking sequence of [0∘/90∘] n , is studied experimentally and analytically. All these composite materials have some common properties, such as
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90∘ rotation (around the axis perpendicular to the ply planes) symmetry in macroscopic properties;
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small ply thickness compared to all other linear dimensions (thickness of the whole material, linear dimensions in the ply plane);
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significantly different Poisson ratios between the fibre direction/perpendicular-to-the-fibre direction and the two perpendiculars to the fibre directions;
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ply thicknesses between 30 and 70 μ m.
A constitutive anisotropic elasto-plastic law for this class of materials is proposed, and its validity with reference to Tensylon™ is verified experimentally. Satisfactory agreement is reached, and the viscous nature of the deviations between the model proposed and the experimental results is revealed.
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Notes
Tables 9 and 10 in this publication contradict each other; we hereinafter compared with Table 10; its data is also reproduced in [8].
The obtained curve was not the desired result of the experiment, and appeared as a result of inaccuracy in the testing program
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Acknowledgements
The authors would like to greatly thank the technical staff of ENSTA Bretagne, and personally Frederic Montel, for their invaluable help during the experimental campaign. The authors are indebted to Associated Professor Claudiu Badulescu for his involvement in the digital image correlation experiments, and Professor Guilhem Bles for his kind remarks and suggestions. Financial support is also acknowledged: the ERASMUS+ program, that allowed the staying of Luminiţa Alil at ENSTA Bretagne, and the project “IED PROTECT”—Modular composite structures for protection against complex effects of improvised explosive devices, National Program “Partnerships in prioritised areas—PN II”, contract no. 283/2014, that allowed the participation of Luminiţa Alil to the ICSMESP Conference.
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Alil, L.C., Arrigoni, M., Badea, S.M. et al. On the Constitutive Law for the Mechanical Quasi-static Response of Criss-Cross Composites (on the Example of UHMWPE). Hum Factors Mech Eng Def Saf 1, 4 (2017). https://doi.org/10.1007/s41314-017-0006-5
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DOI: https://doi.org/10.1007/s41314-017-0006-5