JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 33

Today, these models cover all of the abovedescribed material properties and can be applied to both static and dynamic testing of automotive parts.

Fig. 3: Two different time points in this dynamic event have been investigated for homogeneous isotropic and inhomogeneous anisotropic materials (courtesy of JSOL Corporation) Fig. 4: Injection-moulded part with varying fibre orientation for a sunroof system (courtesy of Ticona and Inteva Products)

Fig. 2: Intake manifolds are prone to dynamic pressure loads caused by engine piston backfire (courtesy of JSOL Corporation)

Fig. 5: Comparison between isotropic and anisotropic approaches for two load cases. The DIGIMAT approach correlates excellently with the experiment (courtesy of Ticona and Inteva Products)

Applications
The use of micromechanical material models proves highly advantageous. Compared to the traditional isotropic approach, vast differences can be seen in terms of part performance prediction. A typical injection-moulded plastic part such as an air intake manifold should be able to withstand a high pressure peak resulting from piston backfire (see Figure 2). Two different time points in this dynamic event were investigated during the simulation (see Figure 3). A dramatic, qualitative difference in performance was observed between the traditional isotropic and the state-of-the-art micromechanical approach. The traditional method completely fails to predict the stress distribution not only over the part but also in the time domain, whereas DIGIMAT software modelling provides a realistic picture. To overcome this well-known limitation of isotropic models, a scaling factor is usually introduced to describe an average of the material properties as varying over the part. However, this procedure is not predictive as it is not possible to derive a unique scaling factor from a rule of thumb. As a consequence, even though experimental curves might be fitted via this approach, the simulation itself is not predictive. This is clearly seen on a plastic part for a sunroof system where two load cases – global and local loading – were

investigated (see Figure 4). To fit the experimental curves for both cases, vastly different scaling factors had to be used (see Figure 5). Conversely, re-running the analyses with one single DIGIMAT material directly gave excellent correlation with the experiment.

Future challenges
In a similar manner, many types of composite properties have been investigated so far using the DIGIMAT approach. As a result, this technique is developing a standard on the market. Engineers can correctly predict static or dynamic scenarios including the failure behaviour of the part. Temperature dependency was recently included to be able to tackle all kinds of under-the-hood applications.

No66 July - August 2011 / jec composites magazine e-Xstream engineering, the software developer, is already looking into the new challenges of the future. Following injection moulding and short fibres, draping as a processing technology for continuous-fibre composites will enter the stage soon. New material models are also in preparation to describe the dependency of local fatigue properties on the material microstructure. The final goal is to go for a full lifetime prediction of composite parts. n
More information: www.e-Xstream.com Jan.Seyfarth@e-Xstream.com Roger.Assaker@e-Xstream.com

33

Feature automotive


http://www.e-Xstream.com

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011

Cover
Edito
Point of view: Products for thermoplastic reinforcement
Contents
Agenda of Events
COMPANY & BUSINESS
- In Brief
- Aeronautics
APPLICATIONS
- Sports and leisure
- Civil engineering
MARKET
- Glass fibre
- Human Resources
- South America
- Sustainability
FEATURE AUTOMOTIVE
- Vessel
- Prepreg
- Software
- Thermoplastic
- Biocomposites
- High Performance
RESEARCH & DEVELOPMENT
- Process
- Environment
TECHNOLOGY & INNOVATIONS
- CNC
- Multiaxial
- Thermoplastic
- Traceability
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Cover
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 2
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Edito
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Point of view: Products for thermoplastic reinforcement
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 5
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Contents
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 7
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Ad1
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Ad2
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - In Brief
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Aeronautics
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 11
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Sports and leisure
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 13
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Civil engineering
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 15
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Glass fibre
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 17
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 18
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Human Resources
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - South America
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 21
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Sustainability
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 23
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 24
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 25
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Vessel
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 27
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 28
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Prepreg
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 30
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 31
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Software
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 33
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Thermoplastic
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 35
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 36
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 37
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 38
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Biocomposites
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 40
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 41
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 42
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 43
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 44
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 45
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - High Performance
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 47
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Process
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 49
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Environment
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 51
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 52
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - CNC
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 54
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 55
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Multiaxial
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Thermoplastic
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 58
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - - Traceability
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 60
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - Index
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - In the world
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 63
JEC COMPOSITES MAGAZINE - Issue #66 - July/August 2011 - 64
https://www.nxtbook.fr/newpress/jeccomposites/jcm2007_135
https://www.nxtbook.fr/newpress/jeccomposites/jcm_2020_Q1_Innovation_Report
https://www.nxtbook.fr/newpress/jeccomposites/jcm2005_Special_Issue3
https://www.nxtbook.fr/newpress/jeccomposites/jcm2005_134
https://www.nxtbook.fr/newpress/jeccomposites/jcm2003_133
https://www.nxtbook.fr/newpress/jeccomposites/jcm2001_132
https://www.nxtbook.fr/newpress/jeccomposites/jcm1911_Special_Issue2
https://www.nxtbook.fr/newpress/jeccomposites/jcm1911_131
https://www.nxtbook.fr/newpress/jeccomposites/jcm1909_130
https://www.nxtbook.fr/newpress/jeccomposites/jcm1907_129
https://www.nxtbook.fr/newpress/jeccomposites/jcm1905_128
https://www.nxtbook.fr/newpress/jeccomposites/jcm1903_Special_Issue1
https://www.nxtbook.fr/newpress/jeccomposites/jcm1903_127
https://www.nxtbook.fr/newpress/jeccomposites/jcm1901_126
https://www.nxtbook.fr/newpress/jeccomposites/jcm1811_125
https://www.nxtbook.fr/newpress/jeccomposites/jcm1810_124
https://www.nxtbook.fr/newpress/jeccomposites/jcm1808_123
https://www.nxtbook.fr/newpress/jeccomposites/jcm1807_122
https://www.nxtbook.fr/newpress/jeccomposites/jcm1805_121
https://www.nxtbook.fr/newpress/jeccomposites/jcm1804_120
https://www.nxtbook.fr/newpress/jeccomposites/jcm1803_119
https://www.nxtbook.fr/newpress/jeccomposites/jcm1802_119-Supplement_Innovation_Report
https://www.nxtbook.fr/newpress/jeccomposites/jcm1801_118
https://www.nxtbook.fr/newpress/jeccomposites/jcm1711_117
https://www.nxtbook.fr/newpress/jeccomposites/jcm1710_116
https://www.nxtbook.fr/newpress/jeccomposites/jcm1708_115
https://www.nxtbook.fr/newpress/jeccomposites/jcm1707_114
https://www.nxtbook.fr/newpress/jeccomposites/jcm1706_113
https://www.nxtbook.fr/newpress/jeccomposites/jcm1704_112
https://www.nxtbook.fr/newpress/jeccomposites/jcm1703_111
https://www.nxtbook.fr/newpress/jeccomposites/jcm1701_110
https://www.nxtbook.fr/newpress/jeccomposites/jcm1611_109
https://www.nxtbook.fr/newpress/jeccomposites/jcm1610_108
https://www.nxtbook.fr/newpress/jeccomposites/jcm1608_107
https://www.nxtbook.fr/newpress/jeccomposites/jcm1607_106
https://www.nxtbook.fr/newpress/jeccomposites/jcm1605_105
https://www.nxtbook.fr/newpress/jeccomposites/jcm1604_104
https://www.nxtbook.fr/newpress/jeccomposites/jcm1603_103
https://www.nxtbook.fr/newpress/jeccomposites/jcm1601_102
https://www.nxtbook.fr/newpress/jeccomposites/jcm1511_101
https://www.nxtbook.fr/newpress/jeccomposites/jcm1510_100
https://www.nxtbook.fr/newpress/jeccomposites/jcm1509_99
https://www.nxtbook.fr/newpress/jeccomposites/jcm1507_98
https://www.nxtbook.fr/newpress/jeccomposites/jcm1505_97
https://www.nxtbook.fr/newpress/jeccomposites/jcm1504_96
https://www.nxtbook.com/newpress/jeccomposites/jcm1503_95
https://www.nxtbook.com/newpress/jeccomposites/jcm1501_94
https://www.nxtbook.com/newpress/jeccomposites/jcm1412_93
https://www.nxtbook.com/newpress/jeccomposites/jcm1410_92
https://www.nxtbook.com/newpress/jeccomposites/jcm1409_91
https://www.nxtbook.com/newpress/jeccomposites/jcm1406_90
https://www.nxtbook.com/newpress/jeccomposites/jcm1405_89
https://www.nxtbook.com/newpress/jeccomposites/jcm1404_88
https://www.nxtbook.com/newpress/jeccomposites/jcm1403_87
https://www.nxtbook.com/newpress/jeccomposites/jcm1401_86
https://www.nxtbook.com/newpress/jeccomposites/jcm1311_85
https://www.nxtbook.com/newpress/jeccomposites/jcm1310_84
https://www.nxtbook.com/newpress/jeccomposites/jcm1308_83
https://www.nxtbook.com/newpress/jeccomposites/jcm1307_82
https://www.nxtbook.com/newpress/jeccomposites/jcm1305_81
https://www.nxtbook.com/newpress/jeccomposites/jcm1304_80
https://www.nxtbook.com/newpress/jeccomposites/jcm1303_79
https://www.nxtbook.com/newpress/jeccomposites/jcm1301_78
https://www.nxtbook.com/newpress/jeccomposites/jcm1212_77
https://www.nxtbook.com/newpress/jeccomposites/jcm1210_76
https://www.nxtbook.com/newpress/jeccomposites/jcm1208_75
https://www.nxtbook.com/newpress/jeccomposites/jcm1207_74
https://www.nxtbook.com/newpress/jeccomposites/jcm1206_73
https://www.nxtbook.com/newpress/jeccomposites/jcm1204_72
https://www.nxtbook.com/newpress/jeccomposites/jcm1203_71
https://www.nxtbook.com/newpress/jeccomposites/jcm1201_70
https://www.nxtbook.com/newpress/jeccomposites/jcm1111_69
https://www.nxtbook.com/newpress/jeccomposites/jcm1110_68
https://www.nxtbook.com/newpress/jeccomposites/jcm1108_67
https://www.nxtbook.com/newpress/jeccomposites/jcm1107_66
https://www.nxtbook.com/newpress/jeccomposites/jcm1105_65
https://www.nxtbook.com/newpress/jeccomposites/jcm1104_64
https://www.nxtbook.com/newpress/jeccomposites/jcm1103_63
https://www.nxtbook.com/newpress/jeccomposites/jcm1101_62
https://www.nxtbook.com/newpress/jeccomposites/jcm1011_61
https://www.nxtbook.com/newpress/jeccomposites/jcm1010_60
https://www.nxtbook.com/newpress/jeccomposites/jcm1009_59
https://www.nxtbook.com/newpress/jeccomposites/jcm1006_58
https://www.nxtbook.com/newpress/jeccomposites/jcm1005_57
https://www.nxtbook.com/newpress/jeccomposites/jcm1004_56
https://www.nxtbook.com/newpress/jeccomposites/jcm1003_55
https://www.nxtbook.com/newpress/jeccomposites/jcm1001_54
https://www.nxtbook.com/newpress/jeccomposites/jcm0911_53
https://www.nxtbook.com/newpress/jeccomposites/jcm0910_52
https://www.nxtbook.com/newpress/jeccomposites/jcm0909_51
https://www.nxtbook.com/newpress/jeccomposites/jcm0907-08_50
https://www.nxtbook.com/newpress/jeccomposites/jcm0906_49
https://www.nxtbook.com/newpress/jeccomposites/jcm0904_48
https://www.nxtbook.com/newpress/jeccomposites/jcm0903_47
https://www.nxtbook.com/newpress/jeccomposites/jcm0901_46
https://www.nxtbook.com/newpress/jeccomposites/jcm0811_45
https://www.nxtbook.com/newpress/jeccomposites/jcm0810_44
https://www.nxtbook.com/newpress/jeccomposites/jcm0809_43
https://www.nxtbook.com/newpress/jeccomposites/jcm0807_42
https://www.nxtbook.com/newpress/jeccomposites/jcm0806_41
https://www.nxtbook.com/newpress/jeccomposites/jcm0805_40
https://www.nxtbook.com/newpress/jeccomposites/jcm0803_39
https://www.nxtbook.com/newpress/jeccomposites/jcm0801_38
https://www.nxtbook.com/newpress/jeccomposites/jcm0712_37
https://www.nxtbook.com/newpress/jeccomposites/jcm0710_36
https://www.nxtbook.com/newpress/jeccomposites/jcm0709_35
https://www.nxtbook.com/newpress/jeccomposites/jcm0707_34
https://www.nxtbook.com/newpress/jeccomposites/jcm0706_33
https://www.nxtbookmedia.com