PSI - Issue 2_B

Matei-Constantin Miron et al. / Procedia Structural Integrity 2 (2016) 3593–3600 Author name / Structural Integrity Procedia 00 (2016) 000–000

3600

8

The direct simulation of the yarn-to-yarn interaction through means of cohesive contacts provides the most accurate results for the investigated configurations. It predicts accurately the stiffness of the composite material, the maximum torque of the component and it captures the instabilities that develop in the component during loading (Fig. 5).

Fig. 5. (a) tested sample, one layer biaxial twill braid; (b) deformed configuration at maximum torque (onset of instability); (c) comparison of the torque – rotation angle curves. The roundup of the comparison between the experimental and predicted results is presented in Table 9.

Table 9. Comparison between the experimental results and the predicted values. Experimental torsional stiffness ( Nm/° ) Analytical prediction ( Nm/° )

Coupled Abaqus Digimat prediction ( Nm/° )

Direct Abaqus simulation prediction ( Nm/° )

Thin walled, 1 braided layer Thick walled, 3 braided layers

137

155

145

140

400

450

440

410

Acknowledgements The current research was performed within the project number 5320343 / 849425 supported by the Österreichische Forschungsförderungsgesellschaft. References Förster, R., Knappe, W., 1971. Experimentelle und theoretische Untersuchungen zur Rißbildungsgrenze an zweischichtigen Wickelrohren aus Glasfaser/Kunststoff unter Innendruck. Kunststoffe 61(8), 583–588. Hashin, Z., Rotem, A., 1973. A Fatigue Criterion for Fiber-Reinforced Materials. Journal of Composite Materials 7(4), 448–464. Neudorfer, S., 2015. Modelling and simulation of braided and filament-wound composite torsion-shaft. Master thesis, Institute of Polymer Product Engineering, Johannes Kepler University Linz. Puck, A., 1967. Zur Beanspruchung und Verformung von GFK-Mehrschichtenverbund-Bauelementen. Teil 1. Grundlagen der Spannungs- und Verformungsanalyse. Kunststoffe 57 4, 284–293. Reuss, A., 1929. Berechnung der Fließgrenze von Mischkristallen auf Grund der Plastizitätsbedingung für Einkristalle. Zeitschrift für Angewandte Mathematik und Mechanik 9, 49–58. Voight, W., 1889. Über die Beziehung zwischen den beiden Elasticitätsconstanten isotroper Körper. Annalen der Physik 274, 573–587.