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http://dx.doi.org/10.7317/pk.2014.38.5.645

Investigation into a Chemical Cracking and the Measurement of Stress in a Polycarbonate Specimen through Deformation Jig  

Yoo, Seo Jeong (Seoul National Univ. of Science & Technology, Dept. of Mechanical System Design Engineering)
Hong, Hyoung Sik (LG Production Engineering Research Institute)
Lyu, Min-Young (Seoul National Univ. of Science & Technology, Dept. of Mechanical System Design Engineering)
Publication Information
Polymer(Korea) / v.38, no.5, 2014 , pp. 645-649 More about this Journal
Abstract
The causes of residual stress in an injection molded part are high temperature variation and shear stress during molding process. Chemical cracking test is one of the methods of measuring residual stress and cracks are developed according to the degree of residual stress. In this study, the relationship between chemical cracking and exerted stress have been investigated. Deformation jig was designed and used to give a stress through deformation in a specimen. Specimens were molded by a hot press using polycarbonate (PC) and annealed to remove residual stresses in the specimens. Specimens were fixed in the deformation jig and immersed into the solvent to create cracks in the specimens. Solvents were prepared by using tetrahydrofuran and methyl alcohol. As stress accordance with the deformation in the specimen increased, the frequency and density of cracks in the specimen also increased. The results of this study can be used for the measurement of residual stress quantitatively in an injection molded PC product using a chemical cracking method.
Keywords
stress; deformation jig; bergen jig; chemical cracking; polycarbonate;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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