Fem-test - Departamento de Engenharia Civil · Title: Microsoft PowerPoint - Fem-test.ppt Author:...
Transcript of Fem-test - Departamento de Engenharia Civil · Title: Microsoft PowerPoint - Fem-test.ppt Author:...
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November 15, 2007 1
Can we perform tests on materials ?!
M. ‘Rien’ Huurman
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November 15, 2007 2
1. Introduction2. Load, Geometry and Material
Examples3. ITT4. DTT5. DSR-mortar6. 4PB
7. Conclusions
INTRODUCTION
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November 15, 2007 3
• Simple straight forward > general idea
• Interrupt at any moment
• General effort to get more information from lab. testing
INTRODUCTION
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November 15, 2007 4
LOAD, GEOMETRY & MATERIAL
This is a top view of a table.
What is the force in each leg?
This is not a joke!
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November 15, 2007 5
LOAD, GEOMETRY & MATERIAL
This is the 20 cm x 20 cm load area. The load is 100 kg.
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November 15, 2007 6
LOAD, GEOMETRY & MATERIAL
There are 4 legs.
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November 15, 2007 7
LOAD, GEOMETRY & MATERIAL
Indication of thedeformations and the stress within the material.
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November 15, 2007 8
LOAD, GEOMETRY & MATERIAL
The materials!
Steel
Rubber
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November 15, 2007 9
LOAD, GEOMETRY & MATERIAL
LOAD
GEOMETRY (structure)
MATERIAL
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November 15, 2007 10
LOAD, GEOMETRY & MATERIAL
Basically we measure Force and Displacement.
We want to know σ & ε.
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November 15, 2007 11
LOAD, GEOMETRY & MATERIAL
F = S x U
σ = E x ε
AF=σ dL
du=ε
Measurement
Transfer function
Material
Strain gauge
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November 15, 2007 12
LOAD, GEOMETRY & MATERIAL
Are our transfer functions correct?
Can FEM help?
(Load!, Geometry!, Material?)
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November 15, 2007 13
EXAMPLES, ITT
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November 15, 2007 14
EXAMPLES, ITT
0
300
600
900
1200
1500
1800
0 2 4 6 8 10 12 14 16 18Time [s]
Forc
e [N
]
-80
-60
-40
-20
0
20
40
Stra
in [ μ
m/m
]Horizontal strain
Vertical strain
Force
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November 15, 2007 15
EXAMPLES, ITT
Overview of the full model
Detail showing the InterFace between loading strip and specimen
Overview of the model when making use of symmetry
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November 15, 2007 16
-9%
-6%
-3%
0%
1456
4241696
Number of elements (full / sym) [-]
Erro
r [-]
784 3136
12164864
16326528
326413056
Horizontal deformation of specimen
Vertical deformation of specimen
EXAMPLES, ITT
-0.9 MPa
0.0 MPa
0.13 MPa
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November 15, 2007 17
EXAMPLES, ITT
ddrcbdra
+⋅+⋅
=ν with hor
vert
defdef
dr = (1)
( )wdef
FfeEhor ⋅
⋅+⋅=
ν (2)
Where: F: applied vertical force [N] w: width of the specimen [mm] defhor: horizontal deformation [*] defvert: vertical deformation [*] dr: deformation ratio [-] a, b, c, d: parameters [-] e, f: parameters [**] Remark: * strain [-] in case of strain gauges or [mm] in case of LVDTs ** [mm-1] in case of strain gauges or [-] in case of LVDTs
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November 15, 2007 18
EXAMPLES, ITT
0
0.2
0.4
0.6
0.8
1
0 0.2 0.4 0.6 0.8 1Normalised input (-)
Nor
m. e
xpla
ined
val
ue (-
)
0
0.2
0.4
0.6
0.8
1
0 0.2 0.4 0.6 0.8 1Normalised input (-)
Nor
m. e
xpla
ined
val
ue (-
)
explained material response v.s. real
material response
E
Pois
Strain gauges LVDTs
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November 15, 2007 19
EXAMPLES, ITTBy use of TF we can determine VE material behaviour….
150 mm ITT; pulse width: 2 s; temp: 350C
0
20
40
60
80
100
120
140
160
180
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48
time [s]
forc
e [N
]
-300
-250
-200
-150
-100
-50
0
50
100
150
stra
in [m
icro
-str
ain]measurement: green,
Burgers’ model fit: red
verticaldeformation
horizontaldeformation
registered force
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November 15, 2007 20
EXAMPLES, ITTBy going back to FE-model we can check procedure….
0
50
100
150
200
250
300
350
0 2 4 6 8 10 12time [s]
forc
e [N
]
-120
-90
-60
-30
0
30
60
90
stra
in [m
icro
-stra
in]
force
horizontal strain
vertical strain
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November 15, 2007 21
EXAMPLES, ITTAnd visualise what goes on in the test.
Stress
CAPA-3D
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November 15, 2007 22
EXAMPLES, DTT
The lab test.
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November 15, 2007 23
EXAMPLES, DTT
FE modelling.
steel pin
end cap
end cap
steel pin
mortar
interface simulating contact between pin
and end cap
Frictionless contact between pin and
end cap
CAPA-3D ABAQUS
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November 15, 2007 24
EXAMPLES, DTT
FE modelling & model fit.
CAPA-3D ABAQUS
-0.7 0 0.45
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November 15, 2007 25
EXAMPLES, DTT
ABAQUS
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November 15, 2007 26
EXAMPLES, DSR-mortar
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November 15, 2007 27
EXAMPLES, DSR-mortar
CAPA-3D
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November 15, 2007 28
EXAMPLES, DSR-mortar
CAPA-3D
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November 15, 2007 29
EXAMPLES, DSR-mortar
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November 15, 2007 30
EXAMPLES, 4PB 4 years ago
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November 15, 2007 31
EXAMPLES, 4PB 4 years ago
CAPA-3D
FE modelling.
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November 15, 2007 32
Strain in longitudinal
direction
EXAMPLES, 4PB 4 years ago
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November 15, 2007 33
Strain in longitudinal
direction
EXAMPLES, 4PB 4 years ago
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November 15, 2007 34
Damage
EXAMPLES, 4PB 4 years ago
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November 15, 2007 35
Damage
EXAMPLES, 4PB 4 years ago
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November 15, 2007 36
EXAMPLES, 4PB 4 years ago
-80
-60
-40
-20
0
20
40
60
80
-0.06 -0.03 0 0.03 0.06
verplaatsing [mm]
krac
ht [N
]
-40
-30
-20
-10
0
10
20
30
40
-0.12 -0.08 -0.04 0 0.04 0.08 0.12
verplaatsing [mm]kr
acht
[N]
4pnt 44 x 44 2pnt 70 x 25
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November 15, 2007 37
EXAMPLES, 4PB 4 years ago
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November 15, 2007 38
•EXAMPLES, 4PB
Disbelieve.We want simple things.What does it bring?It is not exact……….
We don’t want things we do not understand!
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November 15, 2007 39
EXAMPLES, 4PB
Ad and I shaked hands and are now driving each other crazy.
Busy proving the accuracy of FE modeling via AA verification.
Force feeding?????
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November 15, 2007 40
EXAMPLES, 4PBaverageel seize
elements over length
elements over height F D (±0.5 H) D (0) D (↓0.5 H) ε (±0.5 H)
[mm] [N] [mm] [mm] [mm] [µm/m]1D, G=9e9 MPa 16 28 n.a. 155.88 n.a. 0.11423 n.a. 168.391D, G=9e9 MPa 8 56 n.a. 155.88 n.a. 0.11423 n.a. 168.391D, G=9e9 MPa 4 113 n.a. 155.88 n.a. 0.11423 n.a. 168.341D, G=9e9 MPa 3 149 n.a. 155.88 n.a. 0.11423 n.a. 168.391D, G=1111.1 MPa 16 28 n.a. 149.23 n.a. 0.11362 n.a. 161.161D, G=1111.1 MPa 8 56 n.a. 149.23 n.a. 0.11362 n.a. 161.161D, G=1111.1 MPa 4 113 n.a. 149.23 n.a. 0.11362 n.a. 161.181D, G=1111.1 MPa 3 149 n.a. 149.23 n.a. 0.11362 n.a. 161.212D, 1-point load 16 28 4 148.00 0.11258 0.11328 0.11258 159.842D, 1-point load 8 56 6 147.81 0.11250 0.11319 0.11250 159.632D, 1-point load 4 113 12 147.52 0.11237 0.11307 0.112374 159.322D, 1-point load 3 149 16 147.40 0.11233 0.113021 0.112325 159.192D, 2-point load 16 28 4 149.83 0.11336 0.11406 0.11336 161.792D, 2-point load 8 56 6 149.61 0.11326 0.11396 0.11326 161.582D, 2-point load 4 113 12 149.28 0.11312 0.11382 0.113117 161.222D, 2-point load 3 149 16 149.14 0.11306 0.11377 0.113061 161.083D, 2-line load 16 28 4 150.15 0.11318 0.11389 0.11318 162.133D, 2-line load 8 56 6 149.92 0.11309 0.11380 0.11309 161.903D, 2-line load 6 76 8 149.78 0.11303 0.11374 0.11304 161.75
Static elastic
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November 15, 2007 41
EXAMPLES, 4PBDynamic elastic
∆t / cycle ∆t
[-] [s]Ampl[N]
Phase[Degr.]
Ampl[mm]
Phase[Degr.]
Ampl[µm/m]
Phase[Degr.]
1D, G=9e9 MPa 10 0.01 154.95 0.00 0.1141 0.00 168.1 0.001D, G=9e9 MPa 20 0.005 154.99 -0.01 0.1141 0.00 168.1 0.001D, G=9e9 MPa 40 0.0025 154.99 -0.01 0.1141 0.00 168.1 0.001D, G=1111.1 MPa 10 0.01 148.32 0.00 0.1134 0.00 161.0 0.001D, G=1111.1 MPa 20 0.005 148.35 0.00 0.1134 0.00 161.0 0.001D, G=1111.1 MPa 40 0.0025 148.36 0.00 0.1134 0.00 161.0 0.002D, 1-point load 10 0.01 146.92 0.00 0.1123 0.00 159.4 0.002D, 1-point load 20 0.005 146.95 0.00 0.1123 0.00 159.4 0.002D, 1-point load 40 0.0025 146.96 0.00 0.1123 0.00 159.4 0.002D, 2-point load 10 0.01 148.71 0.00 0.1131 0.00 161.4 0.002D, 2-point load 20 0.005 148.74 0.00 0.1131 0.00 161.4 0.002D, 2-point load 40 0.0025 148.75 0.00 0.1131 0.00 161.4 0.003D, 2-line load 10 0.01 148.98 0.06 0.1131 0.00 161.7 0.003D, 2-line load 20 0.005 148.87 0.03 0.1131 0.00 161.7 0.003D, 2-line load 40 0.0025 148.88 0.02 0.1131 0.00 161.7 0.00
Total force U middle Eps middle
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November 15, 2007 42
EXAMPLES, 4PBDynamic visco-elastic
∆t / cycle ∆t
[-] [s]Ampl[N]
Phase[Degr.]
Ampl[mm]
Phase[Degr.]
Ampl[µm/m]
Phase[Degr.]
2D, 1-point load 10 0.01 147.48 28.92 0.1123 0.00 159.42 0.002D, 1-point load 20 0.005 147.16 29.82 0.1123 0.00 159.42 0.002D, 1-point load 40 0.0025 147.08 30.05 0.1123 0.00 159.42 0.002D, 2-point load 10 0.01 149.27 28.92 0.1131 0.00 161.36 0.002D, 2-point load 20 0.005 148.95 29.82 0.1131 0.00 161.36 0.002D, 2-point load 40 0.0025 148.87 30.05 0.1131 0.00 161.36 0.003D, 2-line load 10 0.01 149.50 29.01 0.1131 0.00 161.68 0.003D, 2-line load 20 0.005 149.15 29.88 0.1131 0.00 161.68 0.003D, 2-line load 40 0.0025 149.04 30.10 0.1131 0.00 161.68 0.00
Total force U middle Eps middle
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November 15, 2007 43
EXAMPLES, 4PB1D static elastic ≈ AA
ABAQUS
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November 15, 2007 44
EXAMPLES, 4PB2D static elastic ⇒ AA
ABAQUS
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EXAMPLES, 4PB3D static elastic ⇒ AA
ABAQUS
Why different behaviour at different clamps?
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EXAMPLES, 4PB3D static elastic ⇒ AA
Bending > longitudinal stress.
Material >contract/expand perpendicularly.
Clamp blocks this >Extra system
stiffness
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EXAMPLES, 4PB1D dynamic elastic
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EXAMPLES, 4PB2D dynamic visco-elastic
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EXAMPLES, 4PB3D dynamic visco-elastic
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EXAMPLES, 4PB3D dynamic visco-elastic
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EXAMPLES, 4PB
FE ⇒ AA ≠ FE ⇒ real physical test:
•Pulling via clamp•The clamps have no width•There is no clamping force•There is no clamp-beam interaction•…….
FE ⇒ real physical test………
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EXAMPLES, 4PB
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EXAMPLES, 4PB
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EXAMPLES, 4PB
Clamping force
0100200300400500600700800900
1000
0 0.4 0.8 1.2 1.6Time [s]
Forc
e [N
]
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EXAMPLES, 4PBClamping moment
-100-80-60-40-20
0204060
0 0.4 0.8 1.2 1.6
Time [s]
Mom
ent [
N.m
m]
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EXAMPLES, 4PB
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EXAMPLES, 4PB
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EXAMPLES, 4PB
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CONCLUSIONS
FEM
Test:
GeometryLoadMaterial
Structure:
GeometryLoadMaterial
4PB is basically just an other case.
Pavement design.
What it can do for you depends on your mindset.