JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 34

AERONAUTlCS software

Fig. 2: CheFEM thermodynamic output with a selection of parameters for layer 2
Tab. 1: CheFEM mechanical output for RTD and
RTW conditions

Unit

RTD
(0% RH)

RTW
(100% RH)

Orientation

-

[p/4]

[p/4]

Volume

vol%

68

68

Property
Filler

Matrix
Water
absorption

wt%

0.00

1.51

T*

°C

23

104

E @ T*

GPa

4.6

3.5

S @ T*

GPa

0.078

0.060

e @ T*

%

1.70

1.71

Ex

GPa

62

60 (-3%)

Ey

GPa

62

60 (-3%)

Gxy

GPa

24

23 (-4%)

X

GPa

0.42

0.40 (-5%)

X'

GPa

-0.36

-0.27 (-25%)

Y

-

0.42

0.40 (-5%)

Y'

GPa

-0.36

-0.27 (-25%)

Composite
stiffness

Composite
strength

34

Fig. 3: Tsai-Wu failure envelopes generated by CheFEM. Inlay image: CheFEM
data can be imported in other FEA packages for further fracture and application-oriented analysis

in Figure  2. The 50+ thermodynamic
output properties include chemical
uptake isotherm, chemical solubility,
chemical-thermal
swelling,
glass
temperature depression, diffusion
coefficient, permeation rate, saturation
times and eventual chemical degradation kinetics.
Mechanical output
CheFEM's mechanical output generates, among other properties, the
chemically exposed stiffness and
tensile parameters for the layer. A
selection of this output for RTD (room
temperature dry) and RTW (room
temperature wet) conditions is listed
in Table 1.
Note that T* (°C) is the temperature at
which the matrix unexposed mechanical input properties (stiffness, strength
and yield strain) must be taken. T*
is derived from CheFEM thermodynamics, and based on the simulated
matrix plasticizing and eventual chemical (equilibrium) reaction kinetics. As
such, the described matrix properties
are the only temperature-dependent
mechanical input data that are needed
for CheFEM. This data can usually
be obtained from the matrix material
producer or an experiment. All other
properties, such as fibre stiffness and
strength, can usually be determined at
room temperature.

jec composites magazine / No112 April - May 2017

Failure envelopes
As a direct consequence of the above
generated thermo-mechanical data,
CheFEM can produce failure envelopes according to several failure
criteria, such as maximum stress,
maximum strain and Tsai's quadratic
criteria. Figure 3 shows an example
of the generated Tsai-Wu envelope.
Moreover, CheFEM data can be
imported in other (FEA) software
packages. An example is the Abaqus
Materials Library Manager, which can
be used in conjunction with CheFEM.
Conclusion
The results demonstrated in this
article correlate highly with the experimental work carried out on Thornel
300/Fiberite 934 composites in the
1970s and 1980s. Hence, CheFEM is
definitely a useful tool to get a grip
on the effects of environmental conditions (not only water) on composite
materials. Besides aerospace, CheFEM
is also used in other industries, e.g. for
the analysis of seals, polymers and
composites for oil & gas applications.
The chemical-thermal cycling features
of CheFEM will be discussed in the
forthcoming part 2 of this article.
More information:
www.composite-agency.com


http://www.composite-agency.com

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017

Cover
Edito
Opinion: Civilian robotic
Contents
NEWS
In brief
Yachting
Strategy
Fabric
Agenda
BUSINESS
Additive manufacturing
Carbon
MANUFACTURING
Press
Repair
CNC
Natural fibres
Feature Aeronautics - Will the horizon stay clear?
Simulation
Software
NDT
Tooling
Self healing
Primary structure
Natural fibre
Recycling
Environment
Structures
SOLUTIONS
Sustainability
Sailplane
Lift
Construction
In the world
TECHNOLOGY
Nanomaterials
Thermoplastics
CFRP
Index
Advertisers
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 68
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Cover
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 2
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Edito
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Opinion: Civilian robotic
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 5
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Contents
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 7
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - In brief
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 9
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Yachting
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 11
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Strategy
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 13
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Fabric
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 15
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Agenda
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 17
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Ad IPC
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Ad JEC
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Additive manufacturing
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 19
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Carbon
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 21
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 22
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Press
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 24
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Repair
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - CNC
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 27
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Natural fibres
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 29
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 30
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Simulation
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 32
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Software
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 34
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - NDT
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 36
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Tooling
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 38
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 39
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 40
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Self healing
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 42
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Primary structure
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 44
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Natural fibre
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 46
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 47
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Recycling
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 49
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Environment
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Structures
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 52
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 53
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Sustainability
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Sailplane
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Lift
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Construction
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - In the world
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Nanomaterials
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 60
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 61
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Thermoplastics
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 63
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - CFRP
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 65
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - Advertisers
JEC COMPOSITES MAGAZINE - Issue #112 - April/May 2017 - 67
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