PSI - Issue 28

Saiaf Bin Rayhan et al. / Procedia Structural Integrity 28 (2020) 1892–1900 Author name / Structural Integrity Procedia 00 (2019) 000–000

1899

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5.6. Computation time Finally, we have measured the estimated time required by Ansys Material Designer to solve one problem. Even though CPU and RAM play a significant role in the time required to solve each problem, a general conclusion can be found in Table 3.

Table 3. Computation time of all the elastic properties by Material Designer

Computer Type

CPU

RAM, GB

Computation Time, s

Laptop

Core i-7,5th Gen.

4

40

Desktop

AMD Ryzen 3700x

16

22

6. Conclusion The finite element tools are efficient enough to predict the homogenized properties of unidirectional composite materials. Ansys Material Designer provides a very robust solution under one minute to calculate the stiffness of any unidirectional composite materials. From the results section, it is revealed that except for the Bridging model, other analytical methods cannot estimate all the mechanical properties with good accuracy and in most cases, Ansys FE values are identical with the Bridging model. On the other hand, for most of the instances, specialized Material Designer FE code predicts better outcomes than Comsol FE. In terms of computation time, Ansys performs well in providing a solution in less than one minute in case preloaded RVEs are used. However, it is also found that the Material Designer starts to lose accuracy while predicting in-plane shear modulus (G 12 ) values with experiments, when the fiber volume fraction of unidirectional composite is more than 0.6. In summary, it can be concluded that Material Designer is a powerful and efficient tool to calculate the stiffness of any unidirectional composites. In the future, we wish to continue our research on woven composite, which is more complex in terms of computation and geometry. Acknowledgement The authors are grateful to China Scholarship Council (CSC) to finance their research at Northwestern Polytechnical University, China (CSC grant No. GXZ023506). References Affdl, J. and Kardos, J., 1976. The Halpin-Tsai equations: A review. Polymer Engineering and Science, 16(5), pp.344-352. Alexander, A. and Tzeng, J., 1997. Three Dimensional Effective Properties of Composite Materials for Finite Element Applications. Journal of Composite Materials, 31(5), pp.466-485. Andreassen, E. and Andreasen, C., 2014. How to determine composite material properties using numerical homogenization. Computational Materials Science, 83, pp.488-495. Ansys Material Designer User’s Guide, Release 19.2, 2018. Ansys, Inc. Barbero, E., 2011. Introduction to Composite Materials Design. 2nd ed. Boca Raton: Taylor & Francis, pp.91-105. Benveniste, Y., 1987. A new approach to the application of Mori-Tanaka's theory in composite materials. Mechanics of Materials, 6(2), pp.147 157. Budiansky, B. and Wu, T., 1962. Theoretical prediction of plastic strains in polycrystals. In Proceedings of the 4th U.S. National Congress Theoretical Applied Mechanics, pp. 1175. Christensen, R., 1990. A critical evaluation for a class of micro-mechanics models. Journal of the Mechanics and Physics of Solids, 38(3), pp.379 404. Cioranescu, D. and Donato, P., 2010. An Introduction to Homogenization. Oxford: Oxford University Press. London, UK. Hashin, Z. and Rosen, B., 1964. The Elastic Moduli of Fiber-Reinforced Materials. Journal of Applied Mechanics, 31(2), pp.223-232. Hershey, A., 1954. The elasticity of an isotropic aggregate of anisotropic cubic crystals. ASME Journal of Applied Mechanics, 21, 236–240. Hill, R., 1965. Theory of mechanical properties of fibre-strengthened materials—III. Self-consistent model. Journal of the Mechanics and Physics of Solids, 13(4), pp.189-198. Huang, Z., 2001a. Simulation of the mechanical properties of fibrous composites by the bridging micromechanics model. Composites Part A: Applied Science and Manufacturing, 32(2), pp.143-172.