JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 76

bi-angle NCF

By

Predicting the OHT strength of NCF composites
The progressive damage analysis of open-hole tension (OHT) strength of laminated composite fibre shows significant benefits in using non-traditional bi-angle [0/25] laminates, compared to traditional laminates incorporating 0, ±45, and 90 plies.
Fig. 1: Open-hole tension simulation

MUHAMMAD RIDHA, RESEARCH FELLOW T.E. TAY, PROFESSOR DEPT. OF MECHANICAL ENGINEERING, NATIONAL UNIVERSITY OF SINGAPORE

76

omposite structures are known to be able to withstand much higher loads than the first ply failure stress. Hence, damage tolerance design and analysis of these structures requires the ability to predict their structural behaviour beyond first ply failure. Recent developments in failure theories and damage mechanics have made it possible to predict the behaviour of structures made of fibrereinforced composite laminates beyond first ply failure. Thus, the structural performance achieved with different laminate designs and ply sequences can be compared and optimized even before the structure is produced. The material property (stiffness) degradation method (MPDM) combined with failure theories is a useful tool to analyse progressive damage in composites. Several new failure theories, such as the MicroMechanics of Failure (MMF) theory developed by Prof. S. K. Ha at the Hanyang University in Korea, can differentiate between matrix- and fibredominated failure modes. Using progressive damage simulations, engineers can now better understand the structural behaviour of fibre-

C

reinforced composite laminates. The conventional rule of thumb in using a combination of 0, 45 and 90 plies may be replaced by customizing the ply

jec composites magazine / No68 October 2011

angles in order to optimize them for certain loading conditions based on the simulations. A global team of composite researchers and composite manufacturers led by Prof. S. W. Tsai of Stanford University recently proposed fibrereinforced composite laminates made of biangle [0/25] thin NCF pre-plies. These laminates have been shown to have superior strength, manufacturability and toughness. Progressive damage analyses are used to compare the Fig. 2: Stress-strain curves for [12.5/-12.5]s and quasi-isotropic laminates applications of this new

concept. A simple tensile test and a simple open-hole tension case are used to compare their structural performance. Tensile and OHT tests on bi-angle [12.5/-12.5]s and quasiisotropic [0/45/-45/90]s laminates are modelled using Abaqus with an additional user-defined MPDM code. The model was 25.4 mm x 25.4 mm with a 4.24 mm diameter hole in the centre. Test data by Dr. A. T. Nettles from NASA shows that the average strength of an undamaged bi-angle [12.5/-12.5]s laminate is 1,474 MPa (standard deviation of 155 MPa), while the OHT strength is 811 MPa (standard deviation of 31 MPa). The progressive damage data predicts 1,702 MPa and 665 MPa for the undamaged and OHT tests,



JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011

Cover
Edito
Point of view: Manufacturing in India
Contents
Agenda of Events
COMPANY & BUSINESS
- In Brief
- Carbon - Melbourne establishes its position in the carbon fibre sector
- Pipes - Amiantit Technology, next-level GRP pipe technology
- Marine - Beachcomber, the marine product specialist
APPLICATIONS
- Construction - New architectural hotel facade designed in GRP
- Automotive - New Pilot Super Sport tyre reinforced with para-aramid fibre
- Pipes - Microtunneling jacking pipes for a combined sewage collector in France
MARKET
- Canada - Canadian Advanced Composites R&D centre continues to grow
- Basalt - Continuous basalt fibre (CBF): a natural fibre for composite applications
- Sustainability - Bilan carbon inventory: factor of competitiveness
Special JEC Asia 2011: the place to be!
FEATURE BI-ANGLE NCF
- The amazing bi-angle thin-ply NCF
- C-PLY™, a new structural approach to multiaxials in composites
- Characterization of the equivalent unidirectional thin ply from NCF
- First prepreg of bi-angle NCF and their mechanical properties
- Pultrusion and Resin Film Infusion (RFI) of bi-angle thin-ply NCF
- Representative test data on bi-angle thin-ply NCF
- Processing bi-angle non-crimp fabrics
- Thin-ply NCF: design for deformation through anisotropy
- Performance enhancement by using a bi-angle composite sandwich beam
- Homogenization made easy with biangle thin-ply NCF
- First and last ply failure predictions by homogenized strength parameters
- Equivalent properties for finite element analysis in composite design
- Predicting the OHT strength of NCF composites
- Thin-ply NCF: design for deformation through anisotropy
RESEARCH & DEVELOPMENT
- Thin-ply NCF: design for deformation through anisotropy
- Filament winding - Development of full composite propulsion systems for UAV take-off
TECHNOLOGY & INNOVATIONS
- Aeronautics - Managing EMI grounding & lightning strike protection
- Sustainability - Natural-fibre pultruded composites – a revolutionary new wood substitute
- LFT-PP - New coloured, nonhalogenated flame-retardant LFT-PP products
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - Cover
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 2
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - Edito
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - Point of view: Manufacturing in India
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 5
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - Contents
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 7
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - Ad1
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - Ad2
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 9
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - In Brief
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Carbon - Melbourne establishes its position in the carbon fibre sector
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Pipes - Amiantit Technology, next-level GRP pipe technology
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 13
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Marine - Beachcomber, the marine product specialist
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 15
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Construction - New architectural hotel facade designed in GRP
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 17
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Automotive - New Pilot Super Sport tyre reinforced with para-aramid fibre
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Pipes - Microtunneling jacking pipes for a combined sewage collector in France
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 20
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Canada - Canadian Advanced Composites R&D centre continues to grow
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Basalt - Continuous basalt fibre (CBF): a natural fibre for composite applications
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 23
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 24
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 25
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Sustainability - Bilan carbon inventory: factor of competitiveness
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 27
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 28
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 29
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JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 31
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 32
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - Special JEC Asia 2011: the place to be!
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 34
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 35
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 36
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JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - BGCover
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JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - The amazing bi-angle thin-ply NCF
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 52
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - C-PLY™, a new structural approach to multiaxials in composites
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 54
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Characterization of the equivalent unidirectional thin ply from NCF
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 56
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - First prepreg of bi-angle NCF and their mechanical properties
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 58
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Pultrusion and Resin Film Infusion (RFI) of bi-angle thin-ply NCF
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 60
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Representative test data on bi-angle thin-ply NCF
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 62
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 63
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Processing bi-angle non-crimp fabrics
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 65
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Thin-ply NCF: design for deformation through anisotropy
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 67
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Performance enhancement by using a bi-angle composite sandwich beam
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 69
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Homogenization made easy with biangle thin-ply NCF
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 71
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - First and last ply failure predictions by homogenized strength parameters
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 73
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Equivalent properties for finite element analysis in composite design
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 75
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Predicting the OHT strength of NCF composites
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 77
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Thin-ply NCF: design for deformation through anisotropy
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 79
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 80
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Thin-ply NCF: design for deformation through anisotropy
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 82
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 83
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Filament winding - Development of full composite propulsion systems for UAV take-off
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 85
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 86
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 87
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 88
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Aeronautics - Managing EMI grounding & lightning strike protection
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 90
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 91
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - Sustainability - Natural-fibre pultruded composites – a revolutionary new wood substitute
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - - LFT-PP - New coloured, nonhalogenated flame-retardant LFT-PP products
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 94
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 95
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - Index
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 97
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - In the world
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https://www.nxtbook.fr/newpress/jeccomposites/jcm1711_117
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