Investigation on the Crack Evolution in Glass-Fiber Laminates Depending on the Stacking Sequence

Abstract:

In this paper experiments on the fatigue behavior of flat and tubular Glass Fiber Reinforced Plastics (GFRP) specimens with three different layups ([0/90₅/0], [0/90₂/0_1/2]_s and [0/±45/0_1/2]_s) are presented. The experiments are conducted to study the mechanics under cyclic tension-tension loading (R=0.1) until crack saturation (CDS). Fatigue testing is performed below the critical static load level where first matrix cracks can be observed. Therefore Load Levels (LLs) are derived from crack evolution curves obtained by static tests under usage of transmitted light photography. The shear lag model of Berthelot [1] is applied to the two cross-ply specimens to predict crack evolution. The results show good agreement between the prediction and the experimental data. Deviations can be found in prediction of crack evolution in [0/90₂/0_1/2]_s-specimens. For predicting fatigue stiffness degradation the phenomenological model of Adden [2] is used. The results show good capabilities for predicting stiffness degradation after crack onset.

• Periodical: Key Engineering Materials (Volume 809)
• Pages: 29-34
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.809.29
• Online since: June 2019
• Authors: Benjamin Begemann*, Peter Horst
• Keywords: Experimental Characterization of Materials, Fatigue Testing, Multiaxial Loading, Polymer Composites

References

[1] J.-M. Berthelot, Transverse cracking and delamination in cross-ply glass-fiber and carbon-fiber reinforced plastic laminates: Static and fatigue loading, Appl. Mech. Rev. 56 (2003) 111-147.

DOI: 10.1115/1.1519557

[2] S. Adden, Schädigungsverhalten von glasfaserverstärkten Kunststoffen aus Multiaxialgelegen unter biaxialer Belastung, PhD thesis, Technische Universität Braunschweig, Inst. f. Flugzeugbau und Leichtbau, (2018).

[3] J. Degrieck, W. V. Paepegem, Fatigue damage modeling of fibre-reinforced composite materials: review, Applied Mechanics Reviews, 54.4 (2001) 279-300.

DOI: 10.1115/1.1381395

[4] V.A. Passipoularidis, P. Brøndsted, Fatigue evaluation algorithms: Review, Risö-Report, Risö-R-1740(EN), (2009).

[5] Deutsches Institut für Normung e.V., DIN EN ISO 527-5, Kunststoffe - Bestimmung der Zugeigenschaften – Teil 5: Prüfbedingungen für unidirektional faserverstärkte Kunststoffverbundwerkstoffe, Beuth Verlag GmbH, Berlin, Januar (2010).

DOI: 10.31030/1560314

[6] A. Hannig, Static and fatigue transverse crack initiation in thin-ply fibre-reinforced composites PhD thesis, Technische Universität Braunschweig, Inst. f. Flugzeugbau und Leichtbau, (2018).

[7] T. J. Adam, Überprüfung der theoretischen Vorhersagemöglichkeiten des Ermüdungslebens bei FVW unter biaxialer Belastung, Diplomathesis, technische Universität Braunschweig, Inst. f. Flugzeugbau und Leichtbau, (2009).

[8] A. Puck, Failure analysis of FRP laminates by means of physically based phenomenological models, Composite Science and Technology, 58 (1998) 1045-1067.

DOI: 10.1016/s0266-3538(96)00140-6