JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 41
structure
A 14-seater civil aircraft design with
an innovative composite structure
By
CSIR-NAL, a leading aerospace laboratory in India, has established
sophisticated national facilities for the research and development of
flight vehicles. Its main programme focuses on the design, prototype development, flight testing and certification of small- and
medium-sized civil aircrafts. In this direction, CSIR-NAL is developing a 14-seater civil aircraft, SARAS.
Neelakante Gowda, Scientist,
Dr Byji Varughese, Scientist,
Giridharan Arumugam, Technical Assistant,
Ganesh Ramachandrachari, Technician,
National Aerospace Laboratory (NAL)
Advanced Composites Division (ACD)
Council of Scientific & Industrial Research
(CSIR)
T
Fig 1. 3D Model of bottom integrated skin
Fig 2: Part, vacuum bagged, in autoclave for cure
Carbon/epoxy prepreg material
Carbon/epoxy prepreg was used as
the basic raw material to produce the
structure. The box successfully passed
the stringent non-destructive evaluation (NDE) requirements (Figure 4)
and also meets the stringent dimensional tolerance requirements. After
a thorough literature search, it was
found to be one of the first structures
integrating so many sub-structures
using prepregs and autoclave moulding technology. The entire co-cured
structure was developed using an
innovative tooling technology based
on hybridized silicone rubber tooling
and CFRP tools. The key challenge
was to meet the tight dimensional
No80 April 2013 /
Feature Aeronautics
he entire wing and empennage
of the SARAS aircraft are being
developed using composites. One
of the main components of the horizontal tail is a bottom integrated skin.
The entire bottom substructure (5.1m x
1m), which consists of the skin, 2 spars,
11 ribs and 8 stringers, was co-cured in
a single operation (Figure 1). All the
spars, ribs and stringers were laid to the
net shape on the CFRP contoured tools.
Later, these were transformed onto
the already stacked skin using specially
developed locating media to meet the
stringent dimensional requirements.
The structure was then vacuum-bagged
and cured in an autoclave at 175°C and
7 bar of pressure (Figures 2, 3).
jec composites magazine 41
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013
Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #80 - April 2013
Cover
Edito
Point of view: hig-end solutuions
Contents
Agenda of Events
COMPANY & BUSINESS In Brief
APPLICATIONS
- Sports & leisure
- Renovation
MARKET
- Singapore
- Education
- Natural fibres
- Biocomposites
FEATURE AERONAUTICS
- Carbon
- Process
- Reinforcement
- Structure
- Bi-angle NCF
- RTM
- Sandwich
- Energy
RESEARCH & DEVELOPMENT
- CAE tools
- CFRP
TECHNOLOGY & INNOVATIONS
- Prepreg
- Material
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Cover
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 2
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Edito
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Point of view: hig-end solutuions
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 5
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Contents
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 7
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 9
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - COMPANY & BUSINESS In Brief
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Sports & leisure
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 12
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 13
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Renovation
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Singapore
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 16
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 17
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 18
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Education
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 20
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 21
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 22
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 23
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 24
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 25
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Natural fibres
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 27
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Biocomposites
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 29
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 30
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 31
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 32
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Carbon
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 34
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Process
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 36
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 37
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Reinforcement
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 39
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 40
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Structure
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 42
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Bi-angle NCF
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 44
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - RTM
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 46
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Sandwich
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 48
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 49
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Energy
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 51
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - CAE tools
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 53
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 54
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - CFRP
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 56
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 57
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 58
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Prepreg
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 60
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 61
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - - Material
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 63
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 64
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - Index
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - In the world
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 67
JEC COMPOSITES MAGAZINE - Issue #80 - April 2013 - 68
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