本文關鍵詞：基于三維細觀力學模型的開孔泡沫彈性性能預測　出處：《固體力學學報》2016年04期 　論文類型：期刊論文

  更多相關文章： 彈性泡沫材料 細觀力學模型 彈性常數(shù) 有限元方法

【摘要】：泡沫材料的宏觀力學性能主要取決于基體材料的力學特性及其微細觀結構特征,基于細觀力學模型的分析方法是泡沫材料力學性能研究的重要途徑.文中構建了描述中等孔隙率開孔彈性泡沫材料微結構特征的三維隨機分布球形泡孔模型,并采用有限元方法對彈性泡沫壓縮變形進行了模擬,并計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,建立了相應的唯象表達式.研究表明,泡孔分布的隨機性導致泡沫材料微結構剛度分布不均勻,泡沫壓縮變形過程中不斷發(fā)生局部泡孔坍塌現(xiàn)象直至密實,使得泡沫材料的宏觀壓縮應力應變曲線沒有明顯的平臺段.泡沫材料彈性參數(shù)唯象模型的研究顯示,該模型預測結果與理論模型一致,且與測試結果吻合,論文建立的唯象表達式能夠很好地預測泡沫材料的彈性力學性能.
[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】： 中國工程物理研究院總體工程研究所;清華大學工程力學系;
【基金】：國家自然科學基金項目(11372295;U153029) 中國工程物理研究院科學技術發(fā)展基金項目(2014A0203006);中國工程物理研究院重點學科項目“計算固體力學”資助
【分類號】：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),也稱為海綿橡膠,是一類常見的泡沫聚合物材料,具有能夠承受較大的變形、動載荷作用下峰值應力小、載荷保持率高等優(yōu)點,常用作精密零器件和關鍵部、組件的包裝、隔震材料,在民用和軍工領域都有廣泛應用[1-，

本文編號：1411074