Evaluation of the Edge Crack Torsion (ECT) Test for Mode III Interlaminar Fracture Toughness of Laminated Composites

1997 ◽  
Vol 19 (3) ◽  
pp. 174 ◽  
Author(s):  
WS Johnson ◽  
JE Masters ◽  
DW Wilson ◽  
J Li ◽  
SM Lee ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Edge Crack ◽  
Laminated Composites ◽  
Interlaminar Fracture Toughness ◽  
Mode Iii ◽  
Interlaminar Fracture

Study of mode II interlaminar fracture toughness of laminated composites of glass and jute fibres in epoxy for structural applications

2021 ◽  
Vol 3 (4) ◽  
pp. 044002
Author(s):  
Pankaj Singh Chandel ◽  
Y K Tyagi ◽  
Kanishk Jha ◽  
Rajeev Kumar ◽  
Shubham Sharma ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Laminated Composites ◽  
Curing Temperature ◽  
Mode Ii ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture ◽  
Three Point Bending ◽  
Glass Fibres ◽  
Structural Applications ◽  
Delamination Resistance

Abstract Composites are being used in the place of metals in many industries as they have a lower density and are cheaper than metals. In aerospace industries there is requirement for light weight together with strength, and reinforced fibre composites are superior in some critical properties compared with metals. In this study, laminated composites were fabricated with woven E-glass and jute fibres in an epoxy matrix by a hand layup method. The samples were prepared as per the relevant the America Society for Testing ad Materials (ASTM) standard and tested for mode II interlaminar fracture toughness to investigate delamination resistance. Mode II interlaminar fracture toughness was evaluated by an end-notched flexure test using three-point bending. The fracture toughness G IIC was calculated for a curing temperature range from 40 °C to 70 °C at intervals of 5 °C for different sets of laminated composites. The investigations revealed that when the curing temperature of laminated composites was increased from 40 °C to 70 °C, the interlaminar fracture toughness G IIC was increased in neat woven E-glass laminated composites, decreased in neat jute laminated composites, significantly increased in laminated composites with woven E-glass fibres in compression and jute fibres in tension and slightly increased when woven E-glass fibres were kept in tension and jute fibres in compression.

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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