Prediction of shrinkage and warpage in consideration of residual stress in integrated simulation of injection molding

Choi, Daeseon; Im, Yong‐Taek

doi:10.1016/s0263-8223(00)00045-3

Cited by 108 publications

(46 citation statements)

References 17 publications

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“…This also contributes to diminish residual stress. Similar trends to the one here reported were observed in other studies [5], [6], [8]. Figure 6 shows the regression of the DOE for Polycarbonate at different levels of cooling time, packing time, and pressure.…”

Section: Polycarbonate Analysissupporting

confidence: 86%

“…However, as the packing pressure also increases, the gradient between tensile and compressive stresses becomes larger. Additionally, the higher the cooling time the higher the macromolecular relaxation time, thus lower level of residual stresses were observed [5], [6], [23]- [25]. Table 7 and Table 8 show the residual stress results of the two DOE evaluated for Polypropylene.…”

Section: Polycarbonate Analysismentioning

confidence: 99%

“…In [6], this phenomenon is attributed to two causes, the first being the macromolecular orientation of the material due to stresses induced by tensions of the flow. The second cause is the stresses caused during the cooling stage of the part.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and modeling of simulated residual stress of mold injected plastic parts by using robust correlations

et al. 2017

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The injection molding process is the most widely used processing technique for polymers. The analysis of residual stresses generated during this process is crucial for the part quality assessment. The present study evaluates the residual stresses in a tensile strength specimen using the simulation software Moldex3D for two polymers, polypropylene and polycarbonate. The residual stresses obtained under a simulated design of experiment were modeled using a robust multivariable regression technique. The results shown that residual stresses could be successfully modeled with a quadratic polynomial fit. For both materials, the lowest level of residual stresses was found at the highest mold temperature and the lowest melting temperature.

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Section: Polycarbonate Analysissupporting

confidence: 86%

Section: Polycarbonate Analysismentioning

confidence: 99%

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Analysis and modeling of simulated residual stress of mold injected plastic parts by using robust correlations

et al. 2017

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“…Jansen and Titomanlio [11][12] calculated residual stresses and shrinkage of thin products using an elastic model to study the effect of inmold shrinkage on the final product dimensions and measured the shrinkage under various molding conditions. Choi and Yong-Taek [13] analyzed for shrinkage and warpage using a linear elastic three dimensional finite element method.…”

Section: Literature Reviewmentioning

confidence: 99%

Application of Soft Computing for the Prediction of Warpage of Plastic Injection Molded Parts

Reddy¹,

Kumar²,

Reddy³

et al. 2009

JESTR

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“…Guo and Isayev [22] proposed thermo-elastic and thermo-viscoelastic models with crystallization phenomena taken into account for PP slabs. Choi et al [23] predicted the shrinkage and warpage in consideration of residual stress in integrated simulation of injection molding of PS plates. They used thermo-rheologically simple viscoelastic material model to consider the stress relaxation effect and to describe the mechanical behavior according to the temperature change.…”

Section: Introductionmentioning

confidence: 99%

Residual stresses determination in injection molded virgin and recycled HDPE blends: mechanical properties and morphology

2008

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An experimental study of residual thermal stresses has been carried out in injection molded virgin and recycled high density polyethylene (HDPE) blends. Effects of blend concentrations on residual stresses were investigated under different injection conditions such as melt temperature, mold temperature and cooling time. Layer removal technique was used for measuring residual stresses. In order to determine the relation between the residual stresses and material characteristic of HDPE blends, mechanical and morphological properties of the blends were also investigated. Elastic modulus and impact strength were important key factors for determining the blend characteristics. As a result, it was found that HDPE blends gave higher residual stresses but lower impact strength with higher elastic modulus when recycled concentration was increased. Furthermore, it was seen that shape and size of the crystallites were also effective on residual stresses. Small and spherulitic crystallite structured blends such as 30 % recycled HDPE induced reduction in residual stresses due to easier relaxation with lower elastic modulus and higher impact strength while lamellar crystallite structured blends such as 50 % recycled HDPE gave higher elastic modulus but lower impact strength with higher residual stresses.

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Prediction of shrinkage and warpage in consideration of residual stress in integrated simulation of injection molding

Cited by 108 publications

References 17 publications

Analysis and modeling of simulated residual stress of mold injected plastic parts by using robust correlations

Analysis and modeling of simulated residual stress of mold injected plastic parts by using robust correlations

Application of Soft Computing for the Prediction of Warpage of Plastic Injection Molded Parts

Residual stresses determination in injection molded virgin and recycled HDPE blends: mechanical properties and morphology

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