机织物材料的多尺度模型及其应用  

Multi-scale model and its application of woven fabric material

作　　者：李翠玉[1] 

机构地区：[1]天津工业大学纺织学院,天津300160

出　　处：《计算机工程与应用》2010年第35期225-227,共3页Computer Engineering and Applications

基　　金：国家自然科学基金(No.10272079);天津市科委应用基础研究重点项目(No.06YFJZJC14800)~~

摘　　要：采用机织物的正交各向异性本构模型模拟不出某些悬垂和屈曲现象。为此,引入机织物的多尺度力学模型,建立完整的适合于进行机织物悬垂屈曲模拟的数值分析方法模型,采用多尺度有限元方法模拟其在自重作用下的悬垂及屈曲。与以往采用的正交各向异性力学本构模型相比,多尺度力学模型更加客观地反映了机织物所特有的力学性能;与传统有限单元法相比,多尺度有限单元法的基函数具有能反映单元内参数变化的优点,因此,这种方法能在大尺度上抓住解的小尺度特征,获得较精确的解。采用8结点壳单元离散织物片,这种壳单元为大变形而设计,有能力描述织物片在悬垂中发生的大转动。采用多尺度力学模型的模拟结果显著提高了计算精度,与实验结果吻合较好。Draping and buckling of woven fabric are not simulated with the orthotropic continuum model.Sot,he multi-scale mechanical model is introduced to develop an integrated numerical analysis model qualified to simulate draping and buck-ling of woven fabric under gravity load with multi-scale finite element method.Compared with the orthotropic continuum model used in previous literaturest,he multi-scale mechanical model reveals objectively mechanical properties of woven fabric.Compared with the traditional finite element methodt,he basis function of multi-scale finite element method has the advan-tage of reflecting parameter change in the elements,ot,he method can efficiently capture the large scale behavior of the solu-tion without resolving all the small scale features by constructing the multi-scale finite element base functionst,hat are adap-tive to the local property of the differential operator.The woven fabric sheet is discretized with 8-node shell elements which are designed for finite deformation and suffice to describe the large rotation of fabric sheet during draping.The result demon-strates that calculation precision is evidently improved with the multi-scale mechanical model,and the simulation result coin-cides with the experimental result.

关 键 词：多尺度 机织物 悬垂 屈曲 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]