本文選題：ALE + 注壓成型　； 參考：《應(yīng)用力學(xué)學(xué)報(bào)》2016年03期

【摘要】：塑料熔體壓縮流動(dòng)中在主流動(dòng)平面及厚度方向均有速度變化,結(jié)合了剪切和拉伸兩種流動(dòng)特征。為了準(zhǔn)確描述和模擬塑料熔體的壓縮流動(dòng),本文基于粘彈性及ALE原理建立了熔體三維流動(dòng)理論模型,構(gòu)造了有限元求解的變分方程。為了避免整體求解計(jì)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(dòng)量方程、本構(gòu)方程、能量方程,開(kāi)發(fā)了模擬程序。開(kāi)展了等厚度板及變厚度板的注壓成型實(shí)驗(yàn)及相應(yīng)的數(shù)值模擬,結(jié)果表明:壓縮過(guò)程中出現(xiàn)壓力變化小于4.57%的平臺(tái)現(xiàn)象;溫度呈指數(shù)規(guī)律下降;塑料入口、流動(dòng)末端第一法向應(yīng)力差比平均值分別高1.73MPa、0.87MPa,變厚度區(qū)域第一法向應(yīng)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(guò)程中熔體的壓力、溫度變化、應(yīng)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(xué)橡塑模具國(guó)家工程研究中心;北京航空材料研究院;
【基金】：國(guó)家自然科學(xué)基金(11272291) 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973)項(xiàng)目(2012CB025900) 河南省科技廳基礎(chǔ)研究(142300410029)
【分類號(hào)】：O357
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本文編號(hào)：1994652