|
Design and process-integrated injection molding simulation of highly-filled polymers
4/11/2012 |
|
|
The coupling between the fiber orientation and the melt viscosity in an expanded rheological model of SIGMASOFT®, makes possible an even more accurate prediction of the cavity filling, the final orientation and the part mechanical behavior of highly-filled polymers.
Schaumburg, IL, April 1st 2012 - SIGMA Plastic Services, Inc., Schaumburg, IL, presents the latest improvements of its injection simulation software SIGMASOFT®. A focus of the new developments is the simulation of highly-filled polymers, such as thermoplastics with high percentage of fiber reinforcement.
Following the trend to reduce the weight of molded parts, the demand for highly-filled polymers, such as thermoplastics or thermosets with 50 % or 60 % of fiber content, as well as polymers with metallic reinforcement for powder injection molding applications, has increased in the last years. However, the rheology of these polymers cannot be described with classical viscosity models, such as Cross-WLF or Carreau-WLF. As it was proved by comprehensive trials conducted by SIGMA, this modified rheology of highly-filled polymers influences the filling behavior of the melt, as well as the resulting fiber orientation and thus the predicted warpage and mechanical behavior. If the injection molding simulation ignores these factors, the accuracy of the produced results is questionable and only of limited application.
The fiber orientation influences the viscosity and thus the filling pattern. The currently available simulation models cannot reproduce this interdependence. The predicted fiber orientation and the resulting anisotropic mechanical properties are therefore unreliable, particularly in polymers with a high percentage of fiber reinforcement. In SIGMASOFT®, new models were integrated which reproduce the non-stationary interdependence between the fiber orientation and the viscosity. In this way, the accuracy of the calculated flow behavior is greatly improved for highly-filled polymers. A further advantage of this expansion lies within the improved accuracy of the prediction of the final fiber orientation, particularly in the middle-layer were fibers are predominantly oriented perpendicular to the flow direction, because the actual interaction between viscosity and orientation is considered.
For the trials conducted at SIGMA, 3D-Computer tomographic images, produced by Volume Graphics, were used (Figure 1).
In Figure 2, the fiber orientation perpendicular to the flow direction predicted by the simulation is compared with and without consideration of the interaction between fiber orientation and viscosity. The differences in the prediction of the middle-layer are clearly visible. The influence over the final mechanical properties is evident.
Captions Figure 1 - Visualization of the fiber orientation by means of 3D-Computer tomography. The image resulted from the collaboration between SIGMA Engineering GmbH, Germany and Volume Graphics, as part of the research of the interdependence between fiber orientation and viscosity in SIGMASOFT®. 
Figure 2 - Without the coupling of the fiber orientation and the viscosity, the thickness of the middle layer in fiber reinforced polymers is incorrectly predicted. This results not only in an inaccurate prediction of the shrinkage and warpage behavior but also affects the reliability of subsequent integrative simulations. |
|
Related Exhibition:
|
|
|
 |
|
NPE 2012
|
The International Plastics Showcase
4/1/2012 - 4/5/2012
Venue: Orange County Convention Center, Orlando FL, United States
|
|
|
|
|
|
|
主站蜘蛛池模板：
国产精品久久精品久久精品久久|
亚洲中文字幕免费|
www.九九热|
在线天堂中文字幕|
亚洲中文一区二区av|
一本一本久久a久久精品综合|
中文字幕无码中文字幕有码A|
久久人人97超碰精品|
中文国产不卡一区二区|
99国产欧美另类久久久精品|
国产精品久久vr专区|
国产欧美综合在线观看第十页
|
成人一区二区不卡国产|
91亚洲国产三上悠亚在线播放|
人伦片无码中文字幕|
欧美做awm的视频|
婷婷丁香六月|
日韩欧美不卡一卡二卡3卡四卡2021免费
|
99热国产这里成人|
爱性久久久久久久久|
婷婷六月天在线|
在线永久免费观看黄网站|
人妻无码中文字幕|
欧美一进一出抽搐大尺度视频|
亚洲AV无码一区二区三区高潮|
国产色一区二区三区四区|
欧美3p视频在线观看|
777色婷婷|
亚洲精品乱码久久久久久不卡|
99精品国产在热久久婷婷|
婷婷久久久|
长治市|
久久国内偷拍综合视频|
免费午夜无码片在线观看影院|
国产aⅴ精品一区二区|
国产午夜精品久久精品电影|
性做久久久久久久免费观看|
亚洲一区久久蜜臀av|
欧美一二三区|
97亚洲精品|
99国产精品久久99久久久|
