02 1D有限元分析模型简介-3D梁的应力及挠度分析.pptx

midas NFX 20141D有限元分析模型简介3D梁的应力及挠度分析Piotr Stepien, CAE EngineerNFX International Support特性–丰富的单元库3D单元一般实体单元 (四面体单元，五面体单元，金字塔单元，六面体单元)混合实体单元 (五面体单元, 六面体单元)2D单元壳单元，平面应力单元，平面应变单元，轴对称单元混合壳单元，表面元1D单元梁单元，棒 (桁架) 单元，管单元 其他单元弹簧单元，质量单元，阻尼单元，连接单元刚性连接单元，插值连接单元，弹簧阻尼单元实体单元模型混合单元模型（壳，实体，质量，连接）壳单元模型混合单元模型（壳，实体，梁）梁单元模型单元分类类型真实模型有限元表征(通过节点定义的几何特性)附加条件(真实体积计算)1D 棒（桁架） 梁长度（L）面积（A，截面形状） V = L ? A2D 板壳，平面应力，平面应变，轴对称等面积（A）厚度（t） V = A ? t3D 实体体积（V）无（体积可直接确定）标量弹簧，质量，连接等无-标量单元 1D单元特性- 棒/梁/管/索单元-1D线单元由两个端节点定义-常用于承受弯曲载荷的细长部件（长度远大于截面几何尺寸）1D单元特性-棒单元类型Rod/Truss适用场合可能承受拉/压/扭转载荷的二力部件节点数2 (以一条直线连接两个端节点)每节点自由度数4? 3 平动 (Tx, Ty, Tz) ? 1 扭转 (Rx) * 无转动自由度1D单元特性-梁单元类型梁单元适用场合可能承受弯曲载荷的部件节点数2 (以一条直线连接两个端节点)每节点自由度数6? 3 平动 (Tx, Ty, Tz)? 3 转动 (Rx, Ry, Rz)1D单元特性-梁单元标量单元特性-弹簧单元k缺少几何定义!缺少局部坐标系!类型弹簧单元适用场合传递平动或转动刚度节点数2 (以一条直线连接两个端节点)每节点自由度数1? Tx, Ty, Tz, Rx, Ry, Rz之一标量单元特性-弹簧阻尼单元kc类型弹簧阻尼单元适用场合传递平动或转动刚度与阻尼节点数2 (以一条直线连接两个端节点)每节点自由度数6? 3 平动 (Tx, Ty, Tz)? 3 转动 (Rx, Ry, Rz)功能载体频率分析，非线性分析缺少几何定义!缺少局部坐标系!标量单元特性-间隙单元kopening类型间隙单元适用场合节点数2 (以一条直线连接两个端节点)每节点自由度数6? 3 平动 (Tx, Ty, Tz)? 3 转动 (Rx, Ry, Rz)缺少几何定义!缺少局部坐标系!实例问答环节谢谢！Hello, thank you for joining today’s Introduction to 1D FEA Modeling Webinar. Before we start, let me introduce myself. My name is Piotr Stepien, I’m CAE Engineer and I’m working in Midas IT Company in NFX Technical Support Department. Today I will show you how to use your 3D geometry model to create simplified 1D FEA model, but before this I will present few slides with theoretical introduction to element types. After that I will show you how to perform whole process of simplification for your needs with the most common used features and functions.At the end of todays webinar, as always, there will be some time for questions so I would like to invite you to use chat section in your go to webinar panels. Of course you can ask during the webinar, we will answer on them live or we will collect your questions and back to them later. Midas NFX has been equipped with wide element library. Generally speaking ele