TO DOWNLOAD THE PRESENTATION DROP US A LINE AT mkt@moldex3d.com Accurate material information provides a better simulation results. Learn about the types of plastic materials, measuring equipment used in our laboratories and polymer parameters like viscosity, PVT, crystallinity and how it affects your part design and the production process. Topics of the presentation: >Important aspects of polymer processing simulation >Reasons for having quality material parameters for simulation >The material testing capacity of Moldex3D Material Testing Lab Another great webinar content from our top engineer Tober Sun - Dr. Sun has years of experience developing composite materials for biomedical and automotive applications. Dr. Sun’s expertise is the polymer rheology, processing, and properties. His research interests include polymer composite, biomedical materials and plastics applications in industrial design. He is now the team leader of the Moldex3D Automotive Division, also in charge of material testing lab of Coretech System (Moldex3D).

1. R12.0
Moldex3D
Material Characterization Capabilities
Tober Sun
Material Testing Lab

2. 2
Relationship
between τ and u
or viscosity, η
Equations to describe melt flow
Thermal conductivity, k
Heat capacity, Cp
Temperature-pressure dependent volume, V(T, P)
Modulus, G
  0


u

t
Mass balance
Energy balance
 :








TkT
t
T
Cp u
Momentum balance
gp
Dt
D
  τ
u
CAE procedure
Thermoset conversion balance
0 RjX
Density, ρ
Conversion rate, R
Flow behavior
Cooling, warpage analysis

3. 3
Accurate material information
provides
better simulation results.

4. 4
Major Laboratory equipments line-up
MCR 502
Rotation and
oscillation
tests for
viscoelastic
properties
CR-6000
Capillary
viscosity at
different
temperature
and shear
rates
Rheograph RG25
Capillary viscosity and
thermal conductivity
with counter pressure
equipped
pvT-6000
pvT change
at different
temperature
and pressure
DSC 8500
Transition
temperatures and
crystallization
kinetics
Instron-8966
Mechanical
properties

5. 5
Viscosity measurement
Rotational rheometer
Drag flow
Capillary rheometer
Pressure driven flow
Non-Newtonian

6. 6
> Equipment: GOTECH CR6000 & GOTTFERT RG-25
> Procedure: ASTM D3835
– This test determines viscosity-shear rate behavior of
material at 3 different temperatures. Pressure drop across
the die is measured for each flow rate, and viscosity-shear
rate data are calculated.
> Shear rates: 10~10,000 1/sec
> Max Temperature: 400 oC
> Shear viscosity Model : Cross-WLF model, etc.
Shear Viscosity (from medium to high shear rate)

7. 7
> Equipment: Anton Paar MCR 502
> Procedure: ASTM D4440
– A disk sample (diameter=25mm) is placed between the
parallel plates (or cone and plate) at constant temperature
environment. Small amplitude oscillation shear deformation
is performed, and then the complex viscosity is acquired.
> Frequency: 1~ 628 rad/sec
> Shear viscosity Model : Cross-WLF model, etc.
Viscosity (low shear rate)

8. 8
http://www.dc.engr.scu.edu
Viscosity – temperature sensitivity

9. 9
Lense product

10. 10
> Equipment: GOTECH PVT-6000
> Procedure: ISO 17744
– The machine is heated to the processing temperature,
keeping in fixed pressure, then cooling to 40oC at constant
rate of 5 oC/min. Measure the volume change at least 3
different pressures.
> Temperature range: 40-300 oC
> Pressure range: 10~150 MPa
> pvT Model : modified Tait model
PVT

11. 11
PVT governs part shrinkage
Room temp Ejection temp Temp
Relativevolume
Gate
End of filling
Average
Fast cooling

12. 12
Unique automotive material support
Autoevolution.com perspectives.3ds.com
Compositesworld.com

13. 13
Using elliptical shape to determine
fiber orientation
Instruments used
Scanning electron microscopeMetallographic polishing machine

14. 14
R
F
H
Unique automotive material support
Glass mat thermoplastics
compression
RTM resin viscosity /
fabric permeability

15. 15
Testings for thermoset, EMC materials

16. 16
Testings for thermoset, EMC materials
VCA- Optima XE
Contact angle test
for surface tensile
DMA
Dynamics mechanism analysis
for relaxation modulus

17. 17
pvT”c” curing shrinkage measurement
We use a dilatometer to determine the cure-induced volume
shrinkage at constant pressure and constant temperature. The
volume change is obtained by measuring height change of a disc
shape sample under constant area compression

18. 18
High speed /
Pressure
Thin-wall applications

19. 19
Challenges with thin-wall high pressure
filling
> Viscosity increases at higher pressure
Low Pressure Hi Pressure
High pressure encountered during polymer processing causes the sliding polymer chains
contact more closely with each other. Therefore the viscosity increases.
This phenomena could not be analyzed by previous simple testing methods.

20. 20
Viscosity as a function of pressure
),,(
),(
PTf
Tf





Past
Now

21. 21
Viscosity as a function of pressure
Hi Pressure
Low Pressure
SC-1004A KPA1, 300°C

22. 22
Crystallinity
Effects on dimensions

23. 23
> Equipment: PerkinElmer DSC 8500
> Procedure:
– The material is heated to its molten state and followed by
quench process for 4 different constant cooling rates.
> Max cooling rate: 600 oC/min
> Crystallization Model: Nakamura model
Crystallization

24. 24

25. 25
Width (Dimension B)
Crystallinity
Crystallinity
Crystallinity
Crystallinity

26. 26
Viscoelasticity
CAE Applications

27. 27
Viscoelasticity

28. 28
Viscoelasticity and Optical Property
Polarized
Light
Material
Retardation
d
熔融 流動拉伸 鬆弛
Entanglements
melt Flow Stretch Relaxation

29. 29
> Photoelastic Simulation
Convex lens
Effetc of Flow induced Chain-
Orientation and photoelastic
Effect of Thermal Shrinkage and
photoelastic

30. 30
Modulus – time curve

31. 31
Solid viscoelasticity applications
Annealing
(Short term)
Under-the –hood
(Long term)

32. Thank you for your attention!