本文關(guān)鍵詞：基于三維細(xì)觀力學(xué)模型的開(kāi)孔泡沫彈性性能預(yù)測(cè)　出處：《固體力學(xué)學(xué)報(bào)》2016年04期 　論文類(lèi)型：期刊論文

  更多相關(guān)文章： 彈性泡沫材料 細(xì)觀力學(xué)模型 彈性常數(shù) 有限元方法

【摘要】：泡沫材料的宏觀力學(xué)性能主要取決于基體材料的力學(xué)特性及其微細(xì)觀結(jié)構(gòu)特征,基于細(xì)觀力學(xué)模型的分析方法是泡沫材料力學(xué)性能研究的重要途徑.文中構(gòu)建了描述中等孔隙率開(kāi)孔彈性泡沫材料微結(jié)構(gòu)特征的三維隨機(jī)分布球形泡孔模型,并采用有限元方法對(duì)彈性泡沫壓縮變形進(jìn)行了模擬,并計(jì)算給出了不同孔隙率彈性泡沫材料彈性模量、剪切模量、體積模量以及泊松比的分布,建立了相應(yīng)的唯象表達(dá)式.研究表明,泡孔分布的隨機(jī)性導(dǎo)致泡沫材料微結(jié)構(gòu)剛度分布不均勻,泡沫壓縮變形過(guò)程中不斷發(fā)生局部泡孔坍塌現(xiàn)象直至密實(shí),使得泡沫材料的宏觀壓縮應(yīng)力應(yīng)變曲線沒(méi)有明顯的平臺(tái)段.泡沫材料彈性參數(shù)唯象模型的研究顯示,該模型預(yù)測(cè)結(jié)果與理論模型一致,且與測(cè)試結(jié)果吻合,論文建立的唯象表達(dá)式能夠很好地預(yù)測(cè)泡沫材料的彈性力學(xué)性能.
[Abstract]:The macroscopical mechanical properties of foam materials mainly depend on the mechanical properties of matrix materials and their microstructures. The analysis method based on meso-mechanics model is an important way to study the mechanical properties of foam materials. In this paper, a three-dimensional randomly distributed spherical bubble pore model is constructed to describe the microstructure characteristics of elastic foam materials with medium porosity. The compressive deformation of elastic foam is simulated by finite element method, and the distributions of elastic modulus, shear modulus, volume modulus and Poisson's ratio of elastic foam materials with different porosity are calculated. The corresponding phenomenological expressions are established. The results show that the random distribution of foam pores leads to the uneven distribution of the stiffness of the foamed materials, and the local bubble collapse occurs continuously in the process of foam compression and deformation until dense. The macroscopic compression stress-strain curve of foam material has no obvious platform section. The research of the phenomenological model of foam material elastic parameters shows that the prediction result of the model is consistent with the theoretical model and is in agreement with the test results. The phenomenological expressions established in this paper can well predict the elastic properties of foam materials.
【作者單位】： 中國(guó)工程物理研究院總體工程研究所;清華大學(xué)工程力學(xué)系;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(11372295;U153029) 中國(guó)工程物理研究院科學(xué)技術(shù)發(fā)展基金項(xiàng)目(2014A0203006);中國(guó)工程物理研究院重點(diǎn)學(xué)科項(xiàng)目“計(jì)算固體力學(xué)”資助
【分類(lèi)號(hào)】：O343;TB383.4
【正文快照】： 0引言由橡膠材料經(jīng)發(fā)泡制備的彈性泡沫(elasto-meric foam,rubber foam),也稱(chēng)為海綿橡膠,是一類(lèi)常見(jiàn)的泡沫聚合物材料,具有能夠承受較大的變形、動(dòng)載荷作用下峰值應(yīng)力小、載荷保持率高等優(yōu)點(diǎn),常用作精密零器件和關(guān)鍵部、組件的包裝、隔震材料,在民用和軍工領(lǐng)域都有廣泛應(yīng)用[1-，

本文編號(hào)：1411074