injection-moulded test specimen, polypropylene (bumper ... · development of improved material...
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![Page 1: Injection-moulded test specimen, polypropylene (bumper ... · Development of improved material model(s) for impact loading ... – Numerical simulation of injection moulding to get](https://reader034.vdocuments.us/reader034/viewer/2022042317/5f06cfff7e708231d419dc2a/html5/thumbnails/1.jpg)
1Materials and ChemistryErik Andreassen 2008-04-08
High-speed tensile testingInjection-moulded test specimen, polypropylene (bumper grade)
Crosshead accelerated to speeds up to 10 m/s before gripping test specimen
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2Materials and ChemistryErik Andreassen 2008-04-08
True stress-strain
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3Materials and ChemistryErik Andreassen 2008-04-08
High-speed tensile testing
5 m/s1 m/s500 mm/min
5 mm/min
5 m/s1 m/s500 mm/min
5 mm/min
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4Materials and ChemistryErik Andreassen 2008-04-08
Different responses in tension and compression, modified Mises criterion
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5Materials and ChemistryErik Andreassen 2008-04-08
Material models for simulating impact response
0
500
1000
1500
2000
0 0.005 0.01 0.015 0.02
Deflection [m]
Forc
e [N
]0.7 m/s 0.7 m/s simulation1 m/s 1 m/s simulation2 m/s 2 m/s simulation4 m/s 4 m/s simulation
Validation of models:Comparing results from impact testing with simulations
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6Materials and ChemistryErik Andreassen 2008-04-08
Material models for simulating impact responseValidation of models:Comparing results from impact testing with simulations
0
100
200
300
400
500
600
700
0 0.005 0.01 0.015 0.02
Displacement [m]
Forc
e [N
]4 m/s 4 m/s simulation1 m/s 1 m/s simulation500mm/min (const) 500 mm/m simulation5mm/min (const) 5 mm/min simulation
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7Materials and ChemistryErik Andreassen 2008-04-08
Unloading response
0
5
10
15
20
25
0 0.05 0.1 0.15Strain [-]
True
stre
ss [M
Pa]
Tensile loading and unloading, 800 mm/min
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8Materials and ChemistryErik Andreassen 2008-04-08
New mould for injection moulding test specimensPartly funded by ISI
80 x 80 x 4 mm3 plate80 x 10 x 4 mm3 bars can be machined for
High-speed testing (ISO 18872, large strains)Bending, Charpy etc
Other specimen geometries for shear, compression etcSpecimens can be cut parallell and perpendicular to flowExchangable gate inserts:
Film gatePoint gates at two corners (producing a weld line with varying strength)
Also a cavity for a 80 x 80 x 1.5 mm3 plateCombined pressure and temperature sensor in each cavity
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9Materials and ChemistryErik Andreassen 2008-04-08
Gate block B
Ejectors
Cavity 281 x 81 x 1.51 mm3
Cavity 181 x 81 x 4.05 mm3
Tempering fluid in/out
A, B, C and DExchangable gate blocks
Gate block A for cavity 1 Gate block C for cavity 2 Gate block D for cavity 2
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10Materials and ChemistryErik Andreassen 2008-04-08
Small milling machine for making test specimensPartly funded by ISI
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11Materials and ChemistryErik Andreassen 2008-04-08
Shear etc
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12Materials and ChemistryErik Andreassen 2008-04-08
Iosipescu shear test (ASTM D 5379)
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13Materials and ChemistryErik Andreassen 2008-04-08
Iosipescu shear testing (Xiang and Sue, J. Appl. Polym. Sci., 2001)
Effect of temperature?
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14Materials and ChemistryErik Andreassen 2008-04-08
V-notched rail shear test (ASTM D 7078)
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15Materials and ChemistryErik Andreassen 2008-04-08
Digital image correlationFull-field displacement and strain measurements
Vertical displacements
Shear strain distribution across specmen (horisontally)
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16Materials and ChemistryErik Andreassen 2008-04-08
3D digital image correlationEquipment (hardware and software) will be bought by SINTEF (not funded by ISI)
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17Materials and ChemistryErik Andreassen 2008-04-08
New striker for 3-point bendingimpact test (work in progress)
New force senssor (Kistler 9301B) will be mounted close to striker head
New striker head and striker shaft of titanium alloy
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18Materials and ChemistryErik Andreassen 2008-04-08
PhD workMain objective: Development of improved material model(s) for impact loading
Injection moulded parts, with and without fibre reinforcementTesting and numerical simulation (LS-DYNA)
Suggested topics:Improve test procedures
True stress-strain for tension, compression and shearReliable data from testing of components
Improve or develop material models, and establish robust simulation methodsIn-depth study of deformation, damage and fracture
Material type (MWD etc), recyclingLoading temperatureState of stress (tension/compression, multiaxial, ...)Process-induced anisotropy and inhomogeneity – Numerical simulation of injection moulding to get input for local mechanical properties to LS-DYNA
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19Materials and ChemistryErik Andreassen 2008-04-08
Summary
Various tests (high-speed tension, shear, compression) in development for obtaining better input to material models Digital image correlation for full-field strain measurementsNew mould for assessing processing effects, anisotropy etcPhD student
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20Materials and ChemistryErik Andreassen 2008-04-08
Background info
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21Materials and ChemistryErik Andreassen 2008-04-08
Expertise of the Polymer and Composites groupIn the field “mechanical response”
Knowledge of the characteristics of different polymer materialsCompetence on the micro-mechanics (yield, fracture) of some polymer materials
Effects of morphology/processingCharacterisation by microscopy etc
Experience with testing polymersInstruments designed/modified for polymers (high-speed tensile tester, instrumented falling weight)Special rigs, instrumentationSpecial tests for composites
Some experience with numerical simulation (mainly ANSYS)
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22Materials and ChemistryErik Andreassen 2008-04-08
Equipment for mechanical testingZwick – quasistatic (load cells 10 N – 250 kN, up to 0.5 m/min)Schenk Trebel – quasistatic (100 kN, temp. from -150 to 250 °C)Instron – fatigue (250 kN)Schenk/Instron – high-speed tensile testing (up to 10 m/s) and fatigue (100 kN, but also possibilities for other load cells) Imatek/Rosand – Instrumented dart drop (up to 12 m/s, up to 650 J)
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23Materials and ChemistryErik Andreassen 2008-04-08
Mechanical testing (cont.)
Autoclaves for chemical and thermal exposure, pressure testing etcDynamic mechanical thermal analysis (DMTA)Mini tensile tester (can be placed in a microscope)Rig for creep testing (under development)Measurement of linear thermal expansionExpertise on strain gauges and loggingExperience with high-speed video