Effects of Near Interfacial Microstructure on Interlaminar Fracture Toughness of Hybrid Metal-Polymer Composites

1993 ◽  
Vol 318 ◽  
Author(s):  
Alexander S. Grabilnikov ◽  
Oleg M. Zinevich
Keyword(s):  
Fracture Toughness ◽  
Boundary Layers ◽  
Fracture Resistance ◽  
Thermal Stresses ◽  
Hybrid Composites ◽  
Interlaminar Fracture Toughness ◽  
Energy Effect ◽  
Interlaminar Fracture ◽  
Aramid Fibres ◽  
Wide Range

ABSTRACTResults of detailed study on interlaminar fracture toughness of hybrid aramid-epoxy/aluminum laminate composites are presented. A fracture mechanics approach has been adopted and Mode-I, Mode-II tests for a wide range of loading rates have been used. Hybrid composite failure loci has been studied using SEM technique. Results were analyzed from the point of view of metal substrate/aramid fibre surface free energy effect on near interfacial (in the boundary layers) microstructure and fracture toughness of elastomer modified epoxy resins. It has been shown, that toughened epoxy resin morphology (rubber particles size and volume content) and, as a result, fracture resistance of the boundary layers were strongly dependent upon the adsorption processes, that could take place during adhesion contact formation and curing. To increase interfacial fracture toughness of hybrid composites due to the improvement of near interfacial resin microstructure and boundary layer fracture resistance, as for aluminum-epoxy and for aramid-epoxy failure loci, metal sheets/aramid fibres surface properties and interfacial residual thermal stresses should be optimized. The last result has been achieved by means of si lane primer treatment of aluminum laminates and tensile loading of cured composite.

Interlaminar Fracture Toughness of Hybrid Composites with Non-Woven Tissue

2000 ◽  
Vol 2000 (0) ◽  
pp. 85-86
Author(s):  
Seung Hwan LEE ◽  
Young Bae KIM ◽  
Jin Shik KANG ◽  
Hiroshi NOGUCHI ◽  
Seong Kyun CHEONG
Keyword(s):  
Fracture Toughness ◽  
Hybrid Composites ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture

Mode II Interlaminar Fracture Toughness of CNF-CFRP Hybrid Composite

2006 ◽  
Author(s):  
Masahiro Arai ◽  
Koh-Ichi Sugimoto ◽  
Morinobu Endo
Keyword(s):  
Fracture Toughness ◽  
Carbon Fiber ◽  
Hybrid Composites ◽  
Beam Theory ◽  
Mode Ii ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture ◽  
Cfrp Laminates ◽  
Nano Fiber ◽  
Hybrid Laminates

Interlaminar fracture toughness for mode II deformation were investigated for carbon fiber (CF)/epoxy laminates toughened by carbon-nano-fiber/epoxy interlayer. Vapor grown carbon fiber (VGCF) and vapor grown carbon ‘nano’ fiber (VGNF) were chosen as the stiffeners for the interlayer. In order to illustrate the effect of the interlayer on the model II fracture toughness of the laminates, several types of CFRP/CNF hybrid laminates were fabricated, which are composed of unidirectional prepregs and carbon nano fiber varying the thickness of the interlayer. Mode II interlaminar fracture toughnesses of the hybrid composites were evaluated by end notched flexure (ENF) test using short-type beam specimens. The fracture toughnesses were calculated by traditional beam theory using the energy release rate of the crack. From the experimental results, it is confirmed that the mode II interlaminar fracture toughnesses for hybrid laminates are from 2.0 to 3.0 times higher than that of original CFRP laminates, and the optimal thickness (area density) of the CNF interlayer exists. The difference in the effect of the interlayer fracture properties under mode II deformation was discussed on the bases of fractographic observations derived from scanning electric microscope.

Mixed-Mode Delamination Failure of Z-Pinned Hybrid Laminated Composites

2010 ◽  
Vol 452-453 ◽  
pp. 453-456
Author(s):  
H. Ghasemnejad ◽  
V. Thomas ◽  
H. Hadavinia
Keyword(s):  
Fracture Toughness ◽  
Crack Propagation ◽  
Composite Structures ◽  
Mixed Mode ◽  
Hybrid Composites ◽  
Laminated Composites ◽  
Test Method ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture ◽  
Crack Propagation Resistance

The mixed-Mode interlaminar fracture toughness, GI/IIC, of z-pinned hybrid laminated composites is studied to investigate the effect of 3D-composites on the crack propagation resistance of delaminated composite structures. In this regard, the mixed-Mode interlaminar fracture toughness, GI/IIC, was measured using asymmetric double cantilever beam (ADCB) test method. The hybrid ADCB and z-pinned hybrid composite beams were laid-up from [G0/C0]4, [G0/C90]4, [G90/C0]4 and [G90/C90]4 to study the effect of z-pinning on the interlaminar fracture toughness. From the obtained results from test it was found that the resistance of z-pin fibres against the crack propagation in z-pinned hybrid composites can significantly increase the mixed-mode interlaminar fracture toughness.

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