Mode I, Mode II, and Mixed Mode Interlaminar Fracture of Woven Fabric Carbon/Epoxy

2009 ◽  
pp. 82-82-25 ◽  
Author(s):  
N Alif ◽  
LA Carlsson ◽  
JW Gillespie
Keyword(s):  
Mixed Mode ◽  
Woven Fabric ◽  
Mode I ◽  
Mode Ii ◽  
Interlaminar Fracture

scholarly journals Mixed-Mode Interlaminar Fracture Toughness of Glass and Carbon Fibre Powder Epoxy Composites—For Design of Wind and Tidal Turbine Blades

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2103
Author(s):  
Christophe Floreani ◽  
Colin Robert ◽  
Parvez Alam ◽  
Peter Davies ◽  
Conchúr M. Ó. Brádaigh
Keyword(s):  
Fracture Toughness ◽  
Carbon Fibre ◽  
Composite Structures ◽  
Mixed Mode ◽  
Epoxy Composites ◽  
Mode I ◽  
Mode Ii ◽  
Pure Mode ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture

Powder epoxy composites have several advantages for the processing of large composite structures, including low exotherm, viscosity and material cost, as well as the ability to carry out separate melting and curing operations. This work studies the mode I and mixed-mode toughness, as well as the in-plane mechanical properties of unidirectional stitched glass and carbon fibre reinforced powder epoxy composites. The interlaminar fracture toughness is studied in pure mode I by performing Double Cantilever Beam tests and at 25% mode II, 50% mode II and 75% mode II by performing Mixed Mode Bending testing according to the ASTM D5528-13 test standard. The tensile and compressive properties are comparable to that of standard epoxy composites but both the mode I and mixed-mode toughness are shown to be significantly higher than that of other epoxy composites, even when comparing to toughened epoxies. The mixed-mode critical strain energy release rate as a function of the delamination mode ratio is also provided. This paper highlights the potential for powder epoxy composites in the manufacturing of structures where there is a risk of delamination.

Influence of Temperature on Interlaminar Fracture Toughness of a Carbon Fiber-Epoxy Composite Material

2016 ◽  
Vol 1135 ◽  
pp. 35-51 ◽  
Author(s):  
Rita de Cássia Mendonça Sales ◽  
Bianca Lis Rossi Dias Endo ◽  
Maurício Vicente Donadon
Keyword(s):  
Fracture Toughness ◽  
Mixed Mode ◽  
Mechanical Resistance ◽  
Mode I ◽  
Mode Ii ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture ◽  
Delamination Resistance ◽  
Different Temperatures ◽  
Influence Of Temperature On

Composite materials have been increasingly used in the aerospace industry for the manufacturing of structures, because of the associated properties of low weight and high mechanical resistance. On the other hand, they have low delamination resistance. This paper presents the results of an experimental study performed to obtain the values of interlaminar fracture toughness (G) of a laminate under three different temperatures, using 0º carbon-epoxy prepreg fabric plies and manufactured via Hand lay up cured in autoclave (HLUP). Double Cantilever Beam (DCB) tests were performed to evaluate mode I toughness, Four Point Bend End Notched Flexure (4ENF) for mode II and Mixed Mode Bending (MMB) for mixed mode I / mode II at -54°C, 25°C and 80°C. The data were collected and analyzed using a routine developed in Matlab®. Finally, the relation between GI and GII through the failure envelope and the temperature influence on the interlaminar fracture toughness was assessed.

Effect of Moulding Temperature on Flexure, Impact Strength and Interlaminar Fracture Toughness of CF/PEI Composite

1996 ◽  
Vol 15 (11) ◽  
pp. 1117-1130 ◽  
Author(s):  
Meng Hou ◽  
Lin Ye ◽  
Yiu-Wing Mai
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Impact Strength ◽  
Woven Fabric ◽  
Mode I ◽  
Mode Ii ◽  
Void Content ◽  
Processing Conditions ◽  
Interlaminar Fracture ◽  
Fracture Growth

The effects of processing conditions on the mechanical properties of a CF/PEI woven fabric composite have been investigated. A compression moulding procedure using a hot press was applied to simulate the effects of various processing conditions. The mechanical properties of the CF/PEI composite were characterised by flexure, impact strength and interlaminar fracture tests in relation to the consolidation quality. Consolidation quality was studied through void content and density measurement. The results indicated that the consolidation quality of the composites was highly dependent on the processing temperature. The flexure properties. Mode I and Mode II fracture toughness for crack initiation and Mode II interlaminar fracture growth resistance correlated directly with consolidation quality. However, the Charpy impact strength and Mode I interlaminar fracture growth resistance both increased as the void content was increased because of a “multiple-crack” failure mechanism.

Analysis and Testing of Mixed-Mode Interlaminar Fracture Behavior of Glass-Cloth∕Epoxy Laminates at Cryogenic Temperatures

2005 ◽  
Vol 127 (4) ◽  
pp. 468-475 ◽  
Author(s):  
Yasuhide Shindo ◽  
Daiki Shinohe ◽  
Susumu Kumagai ◽  
Katsumi Horiguchi
Keyword(s):  
Mixed Mode ◽  
Element Model ◽  
Liquid Nitrogen Temperature ◽  
Bending Test ◽  
Effect Of Temperature ◽  
Mode I ◽  
Mode Ii ◽  
Glass Cloth ◽  
Interlaminar Fracture ◽  
Delamination Crack

This paper presents results from an analytical and experimental study of the effect of temperature and mixed-mode ratio on the interlaminar fracture toughness in glass-cloth∕epoxy laminates. Mode I, mode II, and mixed-mode tests were conducted by the double-cantilever beam, end-notched flexure, and mixed-mode bending test methods at room temperature, liquid nitrogen temperature (77 K), and liquid helium temperature (4 K). A finite element model was used to perform the delamination crack analysis. Mode I, mode II, and mixed-mode energy release rates at the onset of delamination crack propagation were computed using the virtual crack closure technique. The fracture surfaces were examined by scanning electron microscopy to correlate with the interlaminar fracture properties.

Annealing effect in glass woven fabric composites, Part I. Mode I and mode II interlaminar fracture behavior

2000 ◽  
Vol 7 (5-6) ◽  
pp. 363-383 ◽  
Author(s):  
M. Kotaki ◽  
T. Kuriyama ◽  
H. Hamada ◽  
Z. Maekawa ◽  
I. Narisawa
Keyword(s):  
Fracture Behavior ◽  
Annealing Effect ◽  
Woven Fabric ◽  
Mode I ◽  
Mode Ii ◽  
Interlaminar Fracture ◽  
Woven Fabric Composites ◽  
Fabric Composites

scholarly journals A Study of the Interlaminar Fracture Toughness of Unidirectional Flax/Epoxy Composites

2020 ◽  
Vol 4 (2) ◽  
pp. 66 ◽  
Author(s):  
Yousef Saadati ◽  
Jean-Francois Chatelain ◽  
Gilbert Lebrun ◽  
Yves Beauchamp ◽  
Philippe Bocher ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Mixed Mode ◽  
Failure Modes ◽  
Glass Fibers ◽  
Epoxy Composites ◽  
Mode I ◽  
Mode Ii ◽  
Pure Mode ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture

Having environmental and economic advantages, flax fibers have been recognized as a potential replacement for glass fibers as reinforcement in epoxy composites for various applications. Its widening applications require employing failure criteria and analysis methods for engineering design, analysis, and optimization of this material. Among different failure modes, delamination is known as one of the earliest ones in laminated composites and needs to be studied in detail. However, the delamination characteristics of unidirectional (UD) flax/epoxy composites in pure Mode I has rarely been addressed, while Mode II and Mixed-mode I/II have never been addressed before. This work studies and evaluates the interlaminar fracture toughness and delamination behavior of UD flax/epoxy composite under Mode I, Mode II, and Mixed-mode I/II loading. The composites were tested following corresponding ASTM standards and fulfilled all the requirements. The interlaminar fracture toughness of the composite were determined and validated based on the specific characteristics of natural fibers. Considering the variation in the composite structure configuration and its effects, the results of interlaminar fracture toughness fit in the range of those reported for similar composites in the literature and provide a basis for the material properties of this composite.

Mode I and Mode II Interlaminar Fracture Behavior of Glass Woven Fabric Composites

2002 ◽  
Vol 10 (5) ◽  
pp. 333-344
Author(s):  
M. Kotaki, ◽  
T. Kuriyama, ◽  
H. Hamada, ◽  
Z. Maekawa, ◽  
I. Narisawa,
Keyword(s):  
Fracture Behavior ◽  
Woven Fabric ◽  
Mode I ◽  
Mode Ii ◽  
Interlaminar Fracture ◽  
Woven Fabric Composites ◽  
Fabric Composites
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