Mode II interlaminar fracture toughness

The increase in mode II interlaminar fracture toughness is even more significant than the mode 1 interlaminar fracture toughness. The similarity in the changes of magnitude of the mode II fracture toughness and the ILSS with regard to the level of... 

Summary of Mode I and Mode II interlaminar fracture toughness values for unidirectional carbon fiber 828 mPDA epoxy matrix composites with different fiber surface treatments ... 

Vf, fiber volume fraction neat resin fracture toughness mode 1 interlaminar fracture toughness of composite G),., mode II interlaminar fracture toughness of composite. 

Fig. 8.10. Correlation of residual compression-after-impact (CAI) strength with composite mode II interlaminar fracture toughness, Gji. After Masters (1987a).

Davies, P., G.D. Sims, B.R.K. Blackman, A.J. Brunner, K. Kageyama, M. Hojo, K. Tanaka, G.B. Murri, C.Q. Rousseau, B. Gieseke, and R. Martin, Comparison of test configurations for determination of mode II interlaminar fracture toughness results from international collaborative test programme. Plastics, Rubber and Composites, 1999. 28(9) p. 432-437. 

Fig. 10. Effects of fiber type (T300 and Altex) and test environment (RT-air and 77K-LN on the relation between mode II interlaminar fracture toughness and increment of crack length in fiber/ poxyH laminates.

Finally, the basic Adhesive B formulation was toughened using the MEAc core-shell polymer and used as the matrix for an epoxy-graphite fiber composite. The mode II interlaminar fracture toughness, GIIc, was increased from 500 J/m2 to 890 J/m2 by the presence of the acrylic core-shell toughener. 

Arai A, Noro Y, Sugimoto K-I and Endo M (2008) Mode I and mode II interlaminar fracture toughness of CFRP laminates toughened by carbon nanofiber interlayer, Compos Sci Technol 68 516-525. 

Beckermann GW, Pickering KL (2015) Mode I and Mode II interlaminar fracture toughness of comjtosite laminates interleaved with electiospun nanofibre veils. Compos A Appl Sci Manuf 72 11-21. doi 10.1016/j.compositesa.2015.01.028... 

O Brien, T.K., Johnston, W.M., Toland, G.J., 2010. Mode II Interlaminar Fracture Toughness and Fatigue Characterization of Graphite Epoxy Composite Material. Report Prepared for NASA, NASA/TM-2010—216838, Hampton, Virginia. 

Mode I and II interlaminar fracture toughness was investigated with unidirectional CF/epoxy and ALF/ epoxy laminates in RT-air and 77K-LN2- A common epoxy matrix was used for both laminates. Mode I fracture toughness of the neat resin was also measured for comparison. The results are summarized as follows ... 

Hojo M, Ando T, Tanaka M, Adachi T, Ochiai S, Endo Y. Modes I and II interlaminar fracture toughness and fatigue delamination of CF/epoxy laminates with self-same epoxy interleaf. Int J Fatigue 2006b 28 1154—65. http //dx.doi.0rg/lO.lOl6/j.ijfatigue. 2006.02.004. 

Davies et al. [64] studied the influence of water absorption on the interlaminar shear strength and end notch flexure (ENF mode II shear) fracture toughness of quasi-unidirectional (88% 0°, 12% 90°) E-glass fibres in DGEBA epoxy resin cured with an amine hardener. Laminates were immersed in (a) distilled water and (b) the Atlantic Ocean ( at Boca Raton, Florida) for up to 8 months at temperatures of 20°C, 50°C and 70°C. Sea water was more slowly absorbed than distilled water. This observation has frequently been made and it provides some reassurance that laboratory tests using distilled water are useful, if slightly cautious, estimates of behaviour in the ocean. 

The composite s resin-dominated material properties are in-plane shear, interlaminar shear, transverse tension/compression, and mode I and II fracture toughness. These properties are... 

Wang, Y. and J.G. Williams, Corrections for mode II fracture toughness specimens of composite materials. Composites Science and Technology, 1992. 43 p. 251-256. O Brien, T.K., Composite interlaminar shear fracture toughness, Gnc Shear measurement or sheer myth in Composite Materials Fatigue and Fracture 7. 

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