scholarly journals Effects of Interface Control and Heat-Treatment Temperature on Interlaminar Shear Strength and Mode II Interlaminar Fracture Toughness of Woven C/C Composites

2001 ◽  
Vol 50 (3Appendix) ◽  
pp. 34-40
Author(s):  
Masaki HOJO ◽  
Taketoshi YAMAO ◽  
Mototsugu TANAKA ◽  
Shojiro OCHIAI ◽  
Norio IWASHITA ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Shear Strength ◽  
Heat Treatment Temperature ◽  
Treatment Temperature ◽  
Interlaminar Shear Strength ◽  
Mode Ii ◽  
Interlaminar Fracture Toughness ◽  
Interface Control ◽  
Interlaminar Shear

scholarly journals Effects of Piezoceramic Particle Addition on the Fracture Toughness Behaviour of CF/EP – Composites

2005 ◽  
Vol 14 (4) ◽  
pp. 096369350501400
Author(s):  
Patrick Rosso ◽  
T. Tanimoto ◽  
Klaus Friedrich
Keyword(s):  
Fracture Toughness ◽  
Piezoelectric Ceramic ◽  
Tensile Tests ◽  
Interlaminar Shear Strength ◽  
Interlaminar Fracture Toughness ◽  
Short Beam ◽  
Beam Shear ◽  
Fracture Surface Analysis ◽  
Interlaminar Shear ◽  
Particle Addition

In this study, the influence of piezoelectric ceramic particles (PZT) on a continuous carbon fibre (CF) reinforced epoxy was investigated. Therefore, unidirectional laminates were produced via film stacking in an autoclave. Mode-I interlaminar fracture toughness tests were carried out as well as tensile tests and short beam shear test to evaluate E-modulus and interlaminar shear strength (ILSS), respectively. The amount of PZT was varied and additional fracture surface analysis by scanning electron microscopy (SEM) clarified how the PZT affects the GIC of the particular laminates. It was found, that the addition of the PZT-particles caused a significant decrease in fracture toughness, whereas stiffness and ILSS were effected only marginally.

scholarly journals Enhancement of the Interlaminar Fracture Toughness of a Carbon-Fiber-Reinforced Polymer Using Interleaved Carbon Nanotube Buckypaper

2021 ◽  
Vol 11 (15) ◽  
pp. 6821
Author(s):  
Yong-Chul Shin ◽  
Seung-Mo Kim
Keyword(s):  
Fracture Toughness ◽  
Shear Strength ◽  
Carbon Nanotube ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Mode Ii ◽  
Interlaminar Fracture Toughness ◽  
Plane Shear ◽  
Interlaminar Fracture ◽  
Reinforced Polymer

In this study, a carbon nanotube (CNT) buckypaper was interleaved in a carbon-fiber-reinforced polymer (CFRP) composite to improve the interlaminar fracture toughness. Interleaving the film of a laminate-type composite poses the risk of deteriorating the in-plane mechanical properties. Therefore, the in-plane shear modulus and shear strength were measured prior to estimating the interlaminar fracture toughness. To evaluate the effect of the buckypaper on the interlaminar fracture toughness of the CFRP, double cantilever beam (DCB) and end notch flexure (ENF) tests were conducted for mode I and mode II delamination, respectively. No significant change was observed for the in-plane shear modulus due to the buckypaper interleaving and the shear strength decreased by 4%. However, the interlaminar fracture toughness of the CFRP increased significantly. Moreover, the mode II interlaminar fracture toughness of the CFRP increased by 45.9%. Optical micrographs of the cross-section of the CFRPs were obtained to compare the microstructures of the specimens with and without buckypaper interleaving. The fracture surfaces obtained after the DCB and ENF tests were examined using a scanning electron microscope to identify the toughening mechanism of the buckypaper-interleaved CFRP.

The Influence of Thermoplastic Film Interleaving on the Interlaminar Shear Strength and Mode I Fracture of Laminated Composites

1996 ◽  
Vol 118 (3) ◽  
pp. 302-309 ◽  
Author(s):  
L. Li ◽  
P. Lee-Sullivan ◽  
K. M. Liew
Keyword(s):  
Fracture Toughness ◽  
Shear Strength ◽  
Film Thickness ◽  
Beam Theory ◽  
Interlaminar Shear Strength ◽  
Mode I ◽  
Mode I Fracture ◽  
Mode I Fracture Toughness ◽  
Fibre Bridging ◽  
Interlaminar Shear

Results are presented on the interlaminar shear strength (ILSS) and Mode I fracture toughness (GIC) of glass/epoxy laminates interleaved with thermoplastic polyester films using four-point bending and double cantilever beam tests, respectively. The ILSS equation from classical beam theory was modified to account for the increased film thickness. It was found that the ultimate failure load and ILSS could be doubled if a thermoplastic film of high ductility but low glass transition temperature is used. Good film/composite ply adhesion is necessary. Mode I fracture toughness is influenced by film thickness and interleaving with a 0.2 mm thick film increased the GIC by 40 percent. Interleaving with a thinner film (0.1 mm), however, resulted in adhesive failure and reduced fibre bridging.

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