Influence of Processing Parameters on Residual Stress in Injection Molded Parts

Poszwa, Przemysław; Muszyński, Paweł; Brzęk, Paweł; Mrozek, Krzysztof

doi:10.1007/978-3-319-99353-9_50

Cited by 2 publications

(4 citation statements)

References 6 publications

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“…Finally, the interaction of a packing time of 7.7 s and a mold temperature of 80 °C resulted in the lowest residual stress because it favored a lower cooling rate and a greater molecular relaxation. This last interaction is also validated in a previous study by Poszwa and collaborators, who highlighted the importance of the packing time in the injection process and its effect on residual stress [ 31 ].…”

Section: Resultssupporting

confidence: 76%

“…The packing time affects both the material shrinkage and molecular relaxation, considering that the filling, packing, and remaining cooling times make up the total cooling time in the mold. In this sense, there is no consensus regarding the effect of the packing time, because it may depend on the interaction with other process variables [ 30 , 31 ].…”

Section: Resultsmentioning

confidence: 99%

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Analysis of the Stress Field in Photoelasticity Used to Evaluate the Residual Stresses of a Plastic Injection-Molded Part

2023

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The degree of quality of thermoplastic injection-molded parts can be established based on their weight, appearance, and defects. However, the conditions of the injection process may induce effects on the mechanical performance of the injected parts, and the residual stresses can cause cracks or early failures when an external load or force is applied. To evaluate these mechanical behaviors, different experimental techniques have been reported in the literature, where digital photoelasticity has stood out both for being a non-contact technique and for achieving quantitative results through sophisticated computational algorithms. Against this background, our proposal consists of analyzing the overall residual stress distribution of parts injected under different molding conditions by using digital photoelasticity. In this case, the specimens are subjected to bending strength tests to identify possible effects of the injection process conditions. The findings show that, at mold temperatures of 80 °C, flow-induced residual stresses increase with packing pressure. However, these internal stress levels do not affect the external load applied by the mechanical bending test, while the mass injected at higher levels of packing pressure helps to increase the bending strength of the injected part. At lower mold temperatures (50 °C), the mechanical strength of the injected part is slightly reduced, possibly due to a lower effect of the packing pressure.

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Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Analysis of the Stress Field in Photoelasticity Used to Evaluate the Residual Stresses of a Plastic Injection-Molded Part

2023

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“…The strongest influence on residual stresses was packing time, which was strongly nonlinear and connected with melt and mold temperature (Poszwa et al, 2018).…”

Section: Packing Timementioning

confidence: 99%

“…They are caused mainly by non-uniform temperature profile in the cavity during filling, packing, and cooling stages. Since residual stresses in a molded part may cause warpage, stress cracking and long-term deformation, the injection molding process should be optimized to minimize these problems (Kim and Youn, 2007;Poszwa et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Residual Stress of Injected Plastic Parts: A Multivariable Approach

Isaza¹,

Jaén-Posada²,

Sierra³

et al. 2021

RJASET

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The analysis of residual stresses generated during the injection molding process is crucial for the part quality assessment. The present study evaluates the generation of residual stress considering different variables that affect them. For that purpose, diverse part geometries were evaluated with different polymers (polycarbonate, ABS and polypropylene) and some Design of Experiments (DOE) were implemented in a simulation software of injection molding process (Moldex 3D). The results show higher residual stresses in thick wall parts due to unbalanced cooling through-thickness. For thin-wall parts, residual stresses were lower because of better cooling through its thickness. The polycarbonate was the more sensitive polymer to residual stresses upon its processing conditions, being the mold temperature and the packing stage the most critical variables to increase or reduce residual stresses.

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Influence of Processing Parameters on Residual Stress in Injection Molded Parts

Cited by 2 publications

References 6 publications

Analysis of the Stress Field in Photoelasticity Used to Evaluate the Residual Stresses of a Plastic Injection-Molded Part

Analysis of the Stress Field in Photoelasticity Used to Evaluate the Residual Stresses of a Plastic Injection-Molded Part

Analysis of Residual Stress of Injected Plastic Parts: A Multivariable Approach

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