Residual Stresses and Birefringence in Injection Molding of Semicrystalline Polymer

1999 ◽  
Vol 14 (4) ◽  
pp. 377-386 ◽  
Author(s):  
X. Guo ◽  
A.I. Isayev
Keyword(s):  
Injection Molding ◽  
Residual Stresses ◽  
Semicrystalline Polymer

scholarly journals Fatigue Fracture Properties and Morphology of Polyoxymethylene (POM) Plates Produced under Moderate Processing Conditions

2018 ◽  
Vol 2018 ◽  
pp. 1-18 ◽  
Author(s):  
M. Berer ◽  
M. Halb ◽  
M. Feuchter ◽  
G. Pacher ◽  
G. Pinter
Keyword(s):  
Injection Molding ◽  
Residual Stresses ◽  
Fatigue Fracture ◽  
Hierarchical Structure ◽  
Strong Dependence ◽  
Combined Effect ◽  
The Other ◽  
Processing Conditions ◽  
Fracture Properties ◽  
Fracture Performance

The present study was inspired by different industry projects in which a strong dependence of the fatigue fracture performance of POM on the processing conditions was observed. To examine the relationships under more reproducible conditions, plates of two different POM homopolymer resins (one significantly nucleated) were produced by compression molding and by injection molding under moderate conditions. For the injection molding, three different mold temperatures were used. At specific locations, the plates were analyzed concerning their hierarchical structure on the micro- and nanolevel and concerning their fatigue fracture performance. For the fatigue fracture performance, the dependence on the processing conditions was rather small for the nucleated resin but much more significant for the other resins. This dependence could not be related to morphological effects only, and thus, a combined effect of morphology and residual stresses was assumed.

scholarly journals Residual stresses in gas-assisted injection molding

2009 ◽  
Vol 49 (1) ◽  
pp. 23-44 ◽  
Author(s):  
Frederico J. M. F. Custódio ◽  
Patrick D. Anderson ◽  
Gerrit W. M. Peters ◽  
António M. Cunha ◽  
Han E. H. Meijer
Keyword(s):  
Injection Molding ◽  
Residual Stresses

scholarly journals Stress Whitening as an Observation Method of Residual Stress in MABS Polymer Material through the Example of Holding Pressure in an Injection Molding Process

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2871
Author(s):  
Paweł Brzęk ◽  
Tomasz Sterzyński
Keyword(s):  
Residual Stress ◽  
Injection Molding ◽  
Residual Stresses ◽  
Local Stress ◽  
Acrylonitrile Butadiene Styrene ◽  
Processing Parameters ◽  
Injection Molding Process ◽  
Molding Process ◽  
Optical Visualization ◽  
Stress Whitening

The effects such as warpage, dimensional instability and environmental stress corrosion, due to the presence of residual stresses in polymeric products, are strongly dependent on injection molding conditions. The holding time and holding pressure belongs to most important processing parameters, determining the dimensional stability and properties of injected goods. A new procedure based on a visualization technique was applied, where the levels of residual stresses of the samples were estimated. The experiments were performed for samples produced of translucent methacrylate acrylonitrile butadiene styrene (MABS), a commodity polymer with a high transparency, necessary for the optical visualization of the stress whitening. The samples produced by injecting molding were deformed to a constant elongation, to observe the dependent stress whitening effect subsequently used to evaluate the stress distribution. It was found that depending on the value of the injection holding pressure, various levels of residual stress and its distribution may be observed in MABS samples. These measurements conformed that the applied optical method is an easy-to-perform technique. The possibility to detect the residual stresses over the whole cross-section of the transparent product, without the necessity for local stress determination, is another significant advantage of this investigation procedure.

Orientation Residual Stresses and Birefringence in Injection Molding

1983 ◽  
Vol 27 (2) ◽  
pp. 115-134 ◽  
Author(s):  
J. Greener ◽  
G. H. Pearson
Keyword(s):  
Injection Molding ◽  
Residual Stresses

Development of PMMA-precoating metal prostheses via injection molding: Residual stresses

2001 ◽  
Vol 58 (4) ◽  
pp. 456-462 ◽  
Author(s):  
Wenping Zhao ◽  
Stephan Barsun ◽  
Karthik Ramani ◽  
Todd Johnson ◽  
Richard King ◽  
...  
Keyword(s):  
Injection Molding ◽  
Residual Stresses
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