本文選題：ALE + 注壓成型　； 參考：《應用力學學報》2016年03期

【摘要】：塑料熔體壓縮流動中在主流動平面及厚度方向均有速度變化,結合了剪切和拉伸兩種流動特征。為了準確描述和模擬塑料熔體的壓縮流動,本文基于粘彈性及ALE原理建立了熔體三維流動理論模型,構造了有限元求解的變分方程。為了避免整體求解計算量大、穩(wěn)定性差的缺陷,提出了兩重迭代解耦合算法分別求解耦合的連續(xù)方程、動量方程、本構方程、能量方程,開發(fā)了模擬程序。開展了等厚度板及變厚度板的注壓成型實驗及相應的數(shù)值模擬,結果表明:壓縮過程中出現(xiàn)壓力變化小于4.57%的平臺現(xiàn)象;溫度呈指數(shù)規(guī)律下降;塑料入口、流動末端第一法向應力差比平均值分別高1.73MPa、0.87MPa,變厚度區(qū)域第一法向應力差比平均值高1.16MPa。本文提出的理論模型和數(shù)值算法能夠較好地表征壓縮過程中熔體的壓力、溫度變化、應力演化。
[Abstract]:In the compression flow of plastic melt, the velocity changes in both the main moving plane and the thickness direction, and the shear and tensile flow characteristics are combined. In order to accurately describe and simulate the compression flow of plastic melt, a three-dimensional melt flow model is established based on viscoelasticity and ale principle, and a variational equation for finite element solution is constructed. In order to avoid the defects of large computation and poor stability, a double iterative decoupling algorithm is proposed to solve the coupled continuous equation, momentum equation, constitutive equation and energy equation respectively, and a simulation program is developed. The experiment and numerical simulation of injection molding of equal thickness plate and variable thickness plate are carried out. The results show that the pressure change is less than 4.57% during compression, the temperature decreases exponentially, the plastic inlet, and the pressure change is less than 4.57%. The first normal stress difference at the end of the flow is 1.73 MPA / 0.87 MPa higher than the average value, and the first normal stress difference in the variable thickness region is 1.16 MPA higher than the average value. The theoretical model and numerical algorithm presented in this paper can well characterize the pressure, temperature change and stress evolution of the melt during compression.
【作者單位】： 鄭州大學橡塑模具國家工程研究中心;北京航空材料研究院;
【基金】：國家自然科學基金(11272291) 國家重點基礎研究發(fā)展計劃(973)項目(2012CB025900) 河南省科技廳基礎研究(142300410029)
【分類號】：O357
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本文編號：1994652