pVT Properties of crystalline polymers. Comparison of Theoretical Predictions and Experimental Data

Bondarenko, E. V.; Motavkin, A. V.; Skorodumov, V. F.

doi:10.1007/s10692-014-9594-5

Cited by 1 publication

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The simulations before ejection were conducted under the initial conditions with the temperature of the moving mold at 20 °C; the temperature of the stationary mold at 20, 60, and 90 °C; a melt temperature of 220 °C. Thermal load was introduced by the density variations because of the temperature dropping during the molding process, and the density variations were described by a modified two-domain Tait equation of state [ 20 , 40 , 41 , 42 ] in this paper.

where V ( T , P ) is the specific volume at temperature T and pressure P ; V 0 is the specific volume at atmospheric pressure; C is a constant, whose value is 0.0894; B is the pressure sensitivity of the material.…”

Section: Methodsmentioning

confidence: 99%

“…The simulations before ejection were conducted under the initial conditions with the temperature of the moving mold at 20 • C; the temperature of the stationary mold at 20, 60, and 90 • C; a melt temperature of 220 • C. Thermal load was introduced by the density variations because of the temperature dropping during the molding process, and the density variations were described by a modified two-domain Tait equation of state [20,[40][41][42] in this paper.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Warpage Prediction of RHCM Crystalline Parts Based on Multi-Layers

Bei

Liu

et al. 2021

Polymers

View full text Add to dashboard Cite

Warpage is a typical defect for injection-molded parts, especially for crystalline parts molded by rapid heat cycle molding (RHCM). In this paper, a prediction method is proposed for predicting the warpage of crystalline parts molded by the RHCM process. Multi-layer models were established to predict warpage with the same thicknesses as the skin-core structures in the molded parts. Warpages were defined as the deformations calculated by the multi-layer models. The deformations were solved using the classical laminated plate theory by Abaqus. A model was introduced to describe the elastic modulus with the influence of temperature and crystallinity. The simulation process was divided into two procedures, before ejection and after ejection. Thermal stresses and thermal strains were simulated, respectively, in the procedure before ejection and after ejection. The prediction results were compared with the experimental results, which showed that the average errors between predicted warpage and average experimental warpage are, respectively, 7.0%, 3.5%, and 4.4% in conventional injection molding (CIM), in RHCM under a 60 °C heating mold (RHCM60), and in RHCM under a 90 °C heating mold (RHCM90).

show abstract