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Study of overflow effects on flow-induced stress in injection molding
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2023-11-10 , DOI: 10.1002/pen.26537
Zhili Lu 1 , Ruixue Ma 1 , Jialu Ma 2 , Wei Cao 1 , Qingwei Huang 2 , Shixun Zhang 1 , Changyu Shen 1
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2023-11-10 , DOI: 10.1002/pen.26537
Zhili Lu 1 , Ruixue Ma 1 , Jialu Ma 2 , Wei Cao 1 , Qingwei Huang 2 , Shixun Zhang 1 , Changyu Shen 1
Affiliation
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Overflow is usually used to keep fluid continuously flowing to avoid the fluid from changing flow direction and subsequently inducing large stresses. To explore the mechanism of flow-induced stress evolution, a flow model was established in terms of compressible, non-isothermal, and viscoelastic flow. Based on the Leonov model and the mid-plane approach, a pseudo-Poisson type equation for pressure was derived to decouple the interdependence between velocity and pressure. To improve computational efficiency, a numerical approach involving double iterations was proposed to solve the flow problem. Two kinds of mold cavities, with and without overflow, were designed and manufactured. Molding experiments were conducted, and corresponding simulations based on the proposed model and algorithm were performed. The results show that the simulated contours of flow-induced stress are in good agreement with the photoelastic streaks. The use of overflow can significantly reduce flow-induced stresses. If the slot thickness is set to a proper value, the flow-induced stress can be reduced by more than 80%. On the other hand, a slot that is too thick does not have significant reducing effects. Therefore, using overflow to reduce flow-induced stresses during transparent part production is a promising approach if the material cost is worthy of the quality.
中文翻译：
注塑过程中溢流对流动诱发应力的影响研究
溢流通常用于保持流体连续流动，以避免流体改变流动方向并随后产生大的应力。为了探索流动引起的应力演化机制，建立了可压缩、非等温和粘弹性流动的流动模型。基于列昂诺夫模型和中面方法，推导了压力的伪泊松型方程，以解耦速度和压力之间的相互依赖性。为了提高计算效率，提出了一种涉及两次迭代的数值方法来解决流动问题。设计并制作了有溢流型和无溢流型两种型腔。进行了成型实验，并基于所提出的模型和算法进行了相应的仿真。结果表明，流致应力的模拟轮廓与光弹性条纹吻合良好。使用溢流可以显着减少流动引起的应力。如果槽厚度设置适当，流致应力可降低80%以上。另一方面，太厚的槽不会产生显着的减少效果。因此，如果材料成本与质量相称，那么在透明零件生产过程中使用溢流来减少流动引起的应力是一种很有前途的方法。
更新日期：2023-11-10
中文翻译：
注塑过程中溢流对流动诱发应力的影响研究
溢流通常用于保持流体连续流动，以避免流体改变流动方向并随后产生大的应力。为了探索流动引起的应力演化机制，建立了可压缩、非等温和粘弹性流动的流动模型。基于列昂诺夫模型和中面方法，推导了压力的伪泊松型方程，以解耦速度和压力之间的相互依赖性。为了提高计算效率，提出了一种涉及两次迭代的数值方法来解决流动问题。设计并制作了有溢流型和无溢流型两种型腔。进行了成型实验，并基于所提出的模型和算法进行了相应的仿真。结果表明，流致应力的模拟轮廓与光弹性条纹吻合良好。使用溢流可以显着减少流动引起的应力。如果槽厚度设置适当，流致应力可降低80%以上。另一方面，太厚的槽不会产生显着的减少效果。因此，如果材料成本与质量相称，那么在透明零件生产过程中使用溢流来减少流动引起的应力是一种很有前途的方法。
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