scholarly journals Evaluation of Interlaminar Fracture Toughness of Glass Fiber - Epoxy-Modified Composite Materials

2018 ◽  
Vol 8 (1) ◽  
pp. 407-414
Author(s):  
Sivakumar. C , Geetha Selvarani. A Sivakumar. C , Geetha Selvarani. A ◽  
Keyword(s):  
Fracture Toughness ◽  
Composite Materials ◽  
Glass Fiber ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture

scholarly journals Woven Glass Fiber Composites with Aligned Carbon Nanotube Sheet Interlayers

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Hardik Bhanushali ◽  
Philip D. Bradford
Keyword(s):  
Fracture Toughness ◽  
Glass Fiber ◽  
Mode I ◽  
Mode Ii ◽  
Interlaminar Fracture Toughness ◽  
Fiber Reinforced ◽  
Interlaminar Fracture ◽  
Glass Fiber Reinforced ◽  
Short Beam ◽  
Woven Glass Fiber

This investigation describes the design, fabrication, and testing of woven glass fiber reinforced epoxy matrix laminates with aligned CNT sheets integrated between plies in order to improve the matrix dominated through thickness properties such as the interlaminar fracture toughness at ply interfaces. Using aligned CNT sheets allows for a concentration of millimeter long CNTs at the most likely point of laminate failure. Mode I and Mode II interlaminar fracture toughness of various CNT modified samples were investigated using double cantilever beam (DCB) and end notched flexure (ENF) experiments, respectively. Short beam strength (SBS) and in-plane tensile properties of the CNT modified samples were also investigated. Moderate improvement was observed in Mode I and Mode II fracture toughness at crack initiation when aligned CNT sheets with a basis weight of 0.354 g/m2were used to modify the ply interface. No compromise in the in-plane mechanical properties of the laminate was observed and very little improvement was observed in the shear related short beam strength of the CNT modified laminates as compared to the control samples. Integration of aligned CNT sheets into the composite laminate imparted in-plane and through thickness electrical properties into the nonconductive glass fiber reinforced epoxy composite laminates.

The Relation of the Interlaminar Fracture Toughness and the Acoustic Emission (Ae) under the Enf Test

2007 ◽  
Vol 353-358 ◽  
pp. 279-282
Author(s):  
Juho Kwak ◽  
Yu Seong Yun ◽  
Oh Heon Kwon
Keyword(s):  
Fracture Toughness ◽  
Composite Materials ◽  
Laminate Composite ◽  
High Strength ◽  
Light Weight ◽  
Interlaminar Fracture Toughness ◽  
Laminate Composites ◽  
Interlaminar Fracture ◽  
Good Corrosion Resistance ◽  
Enf Test

Recently, composite materials are used in many fields because their properties are high strength, high stiffness, and they have light weight, good corrosion resistance and good thermal conductivity. However, composite materials have relatively a lot of problems, especially delamination, compared with common materials such as a steel and aluminum, etc. Therefore, having the interlaminar fracture toughness for a laminate composite is important. In this study, the end notched flexure (ENF) specimens are employed in order to evaluate modeⅡ interlaminar fracture toughness for CFRP laminate composites. Three kinds of a/L ratio were applied to these specimens under the different pressure level. Also, we discuss the relation of crack growth and the interlaminar fracture toughness in terms of AE characteristics using ENF test.

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