【正文】 material. You can define these properties as tables to make them temperaturedependent. Thermal stress analysis A thermal stress analysis can optionally use thermal results as preload input for a structural analysis. To use the preload attributes for NX Nastran: In the Simulation Navigator, rightclick the subcase in the structural solution, and choose Edit Solution Step. Under Temperature PreLoad, choose NASTRAN Temperatures. Browse and select the NX Nastran *.op2 file, which contains the temperature results. For results from NX Thermal, set the Temperature PreLoad type to NX Thermal Temperatures. Understanding a preload When you specify a preload, the solver: Reads the nodal temperature data from the selected output file. Applies the temperatures to the nodes of the structure. The meshes must be identical for NX Nastran, but are not required for NX Thermal. Uses the strain free temperature from the material data or the solution attributes for the delta T calculation. Uses the structural material properties, together with any existing structural loads. Buckling analysis: ?Determines buckling loads and buckled mode shapes. ?A buckling load is the critical load at which a structure bees unstable. ?A buckled mode shape is the characteristic shape associated with a structure39。s buckled response. ?Identifies the critical load factor, which is the value that can be multiplied by the applied load to cause buckling. The buckling analysis incorporates the stiffness due to the part geometry, material properties, and the applied loads and constraints. ? represents the stiffness of the initial configuration, and is puted from the initial part geometry and the linear material stiffness. ? represents the stress stiffness due to the applied loads and constraints. ? represents the critical load factor multiplier (eigenvalue). ? represents the buckled mode shape (eigenvector). In NX Nastran, a buckling solution includes a buckling loads subcase and a buckling methods subcase An SESTATIC 101 linear static solution: Calculates the element stiffness (K) matrix once at the beginning of the solution. Assumes Hooke39。MSC/Nastran ? Abaqus ? LSDYNA ? 求解功能 ? （ NX Nastran 無求解規(guī)模限制）： ? 線性靜態(tài)分析（含慣性釋放） ? 模態(tài)分析 ? 屈曲分析 ? 穩(wěn)態(tài)熱傳導(dǎo) ? 瞬態(tài)熱傳導(dǎo) ? 點焊分析 ? 后處理 ? 云圖 ? XY圖線 分析向?qū)? ?強度分析向?qū)? ?振動分析向?qū)? Page 16 SIEMENS PLM Software ? 縮短 FE建模 /網(wǎng)格劃分時間 ? 改進 FEA求解時間 ? 跟蹤工程數(shù)據(jù) ? 提早開始系統(tǒng)級 CAE分析 NX CAE的價值 —— 流程創(chuàng)新 Solve Mesh Look for information Evaluate Create geometry Loads BCs Mesh Evaluate Create geometry Look for information Loads BCs Part Design Create geometry Export amp。CAE一體化流程 幾何 CAE 模型 求解 結(jié)果查看 載荷和邊界 報告與結(jié)論 迭代與優(yōu)化（如果有需要） 理想化模型 前處理 后處理 ?CAD數(shù)據(jù)無需轉(zhuǎn)化到 CAE平臺 ?幾何處理方式多樣靈活 ?網(wǎng)格劃分高效 ?CAE模型與 CAD參數(shù)關(guān)聯(lián)更新 !!! ?高級仿真和設(shè)計仿真提供分級解決方案 Page 18 SIEMENS PLM Software NX CAE的價值 —— 結(jié)構(gòu)創(chuàng)新 ? NX 軟件最先提出多級仿真數(shù)據(jù)結(jié)構(gòu) ? 優(yōu)點： ? 1 各層數(shù)據(jù)柔性映射 2 追蹤簡化模型與主模型的變更關(guān)系 3 柔性化數(shù)據(jù)管理和模型重用