Isotropy of mechanical properties and environmental stress crack sensitivity in injection‐ and injection‐compression molding of polystyrene with different mold temperature
Isotropy of mechanical properties and environmental stress crack sensitivity in injection‐ and injection‐compression molding of polystyrene with different mold temperature
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不同模温聚苯乙烯注射和注射压缩成型力学性能各向同性及环境应力裂纹敏感性
DOI：
10.1002/pen.25793
复制
发表时间：
2021
影响因子：
3.2
通讯作者：
Drummer
中科院分区：
文献类型：
--
作者：
Drummer
除了传统的注射压缩成型和动态工艺温度控制的注射成型外，这两种工艺的协同组合最近已应用于动态温度控制的注射压缩成型。二维保压效果与高模具温度下熔体流动性的长期保持相结合，可实现特别大的流道壁厚比。在大多数情况下，仅考虑微结构和纵横比的优化模制，而不包括此类制造部件的改变的内部结构。在研究过程中，考察了模具温度变化下不同工艺策略对薄壁聚苯乙烯部件的机械性能和应力裂纹敏感性中与生产相关的各向异性的影响。测定的机械性能显著低于材料数据表中给出的数值，该材料采用了高模具温度的注塑-压缩成型工艺变体。然而，结果还显示了方向和流动路径相关的机械性能的明显均匀化。相反，以这种方式生产的部件倾向于显示出增加的环境应力裂纹敏感性。这可以归因于作为有利进行的取向松弛的结果的显著减少的取向。
In addition to conventional injection‐compression molding and injection molding with dynamic process temperature control, a synergistic combination of both processes has recently been applied in dynamic temperature‐controlled injection‐compression molding. The two‐dimensional holding pressure effect in combination with the long maintenance of the flowability of the melt due to high mold temperature enables particularly large flow path to wall thickness ratios. In the most cases, only the optimized molding of microstructures and aspect ratios is considered without including the changed internal structure of such manufactured components. In the course of this investigation, the influence of different process strategies under variation of the mold temperature on production‐related anisotropies in the mechanical properties and stress crack sensitivity of thin‐walled polystyrene components was examined. The determined mechanical properties are significantly below the values given in the data sheet of the material in the adapted process variant of injection‐compression molding with high mold temperature. However, the results also show a clear homogenization of the direction‐ and flow path‐dependent mechanical properties. In contrast, components produced in this way tend to show increased environmental stress crack sensitivity. This could be attributed to significantly reduced orientations as a result of the favorably proceeding orientation relaxation.
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结构约束
DOI：
--
发表时间：
2020
期刊：
Strukturverhalten
影响因子：
--
作者：
G. Ehrenstein
通讯作者：
G. Ehrenstein
影响因子：
3.2
作者：
DIETZ, W;WHITE, JL;CLARK, ES
通讯作者：
CLARK, ES
影响因子：
4.5
作者：
EVANS, BL
通讯作者：
EVANS, BL
DOI：
10.1088/0960-1317/25/6/065008
发表时间：
2015-06-01
影响因子：
2.3
作者：
Rytka, C.;Kristiansen, P. M.;Neyer, A.
通讯作者：
Neyer, A.
影响因子：
7.4
作者：
Young, Edrnond W. K.;Berthier, Erwin;Guckenberger, David J.;Sackmann, Eric;Lamers, Casey;Meyvantsson, Ivar;Huttenocher, Anna;Beebe, David J.
通讯作者：
Beebe, David J.