SIMULATION OF CRACK PATH IN FOAM-CORE CRACKED SANDWICH BEAM SPECIMEN
Keywords:
Crack path simulation, cracked sandwich beam, mixed mode fractureAbstract
A crack path simulation in the core of a mixed mode I and mode II cracked sandwich beam (CSB) specimen, called a non-symmetric CSB, is presented. The loading configuration of the specimen was identical to that used for the mode I condition (crack opening loading). A combination of mode I and mode II loading was achieved by manipulating the apparent flexural stiffness of the upper and lower face/core composite. The simulation of the crack path revealed that the crack grows toward the face with lower flexural stiffness before being propagated to the effective position in the longitudinal strain of the upper and lower parts of the crack plane. The position may be either in the core, in the interface layer, or in the face of the sandwich beam. Simulations of the crack path in pure mode I and pure mode II CSB specimens that were achieved by applying a crack-opening and shear force to the specimen are also demonstrated. The crack path simulation in this study was performed using the results of the finite element analysis in combination with the virtual crack-closure technique and the maximum tangential stress criterion.
References
Banghai, J., Zhibin, L., Fangyun, L. (2015). Failure mechanism of sandwich beams subjected to three-point bending. Compos. Struct., 133:739-745.
Broek, D. (1986). Elementary Engineering Fracture Mechanics. 4th revised ed. Martinus Nijhoff Publishers, Leiden, Netherlands, 540p.
Bruno, D. and Greco, F. (2000). Mixed mode delamination in plates: a refined approach. Int. J. Solids Struct., 50-51:9,149-9,177.
Carlsson, L.A. and Prasad, S. (1993). Interfacial fracture of sandwich beams. Eng. Fract. Mech., 44:581-590.
Erdogan, F. and Sih, G.C. (1963). On the crack extension in plates under plane loading and transverse shear. J. Basic Eng., 85:519-527.
Irwin, G.R. (1957). Analysis of stresses and strains near the end of a crack transverse plate. J. Appl. Mech., 24:361-364.
Li, X. and Carlsson, L.A. (1999). The tiled sandwich debond (TSD) for face/core interface characteri-zation. J. Sandw. Struct. Mater., 1:60-75.
Limpitipanich, P. and Rusmee, P. (2004). Design of composite sandwich panels for crack growth path control; Proceedings of the 1st International Conference on Manufacturing and Management; December 8-10, 2004; Vellore, India, p. 195-200.
Mills, N.J. and Kang, P. (1994). The effect of water immersion on the mechanical properties of polystyrene bead foam used in soft shell cycle helmets. J. Cell. Plast., 30:196-221.
Narayana, N.B. and Dattaguru, B. (1996). Certain aspects related to computation by modified crack closure integral (MCCI). Eng. Fract. Mech., 55:335-339.
Odessa, I., Frostig, Y., Rabinovitch, O. (2017). Modeling of interfacial debonding propagation in sandwich panels. Int. J. Solids Struct., 148-149:67-78.
Raju, I.S. (1987). Calculation of strain-energy release rates with higher order and singular finite elements. Eng. Fract. Mech., 28:251-274.
Rybicki, E.F. and Kanninen, M.F. (1977). A finite element calculation of stress intensity factors by the modified crack closure integral. Eng. Fract. Mech., 9:931-938.
Shivakumar, K.N. and Smith, S.A. (2004). In situ fracture toughness testing of core materials in sandwich panels. J. Compos. Mater., 38:655-668.
Stupak, P.R., Frye, W.O., and Donovan, J.A. (1991). The effect of bead fusion on the energy absorption of polystyrene foam. Part I: Fracture toughness. J. Cell. Solids, 27:484-505.
Tada, H., Paris, P.C., and Irwin, G.R. (2000). The Stress Analysis of Cracks Handbook. 3rd ed. ASME Press, New York, NY, USA, 677p.
Vinson, J.R. (1999). The Behavior of Sandwich Structures of Isotropic and Composite Materials. Technomic Publishing Company, Inc., Lancaster, PA, USA, 378p.
Yokozeki, T. (2011). Analysis of crack kinking in foam core sandwich beams. Compos. Part A-Appl. S., 42(10):1,493-1,499.
