MSC.Nastran非线性分析（SOL 600）用户指南

MSC.Nastran

Implicit

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"MSC.Nastran隐式非线性(SOL 600)用户指南提供了关于如何使用Nastran进行非线性分析的详细步骤和方法，包括模型定义、非线性分析类型以及结果解释。该指南还涵盖了MSC.Nastran的相关软件产品，如MSC.Marc和MSC.Patran的文档参考。" 在《MSC.Nastran隐式非线性(SOL 600)用户指南》中，用户可以了解到以下关键知识点： 1. **非线性分析**：Nastran的SOL 600解决方案专注于非线性问题，这些问题可能涉及材料非线性、几何非线性或接触非线性。非线性分析允许模拟在极端条件下的结构行为，例如大变形、屈曲或材料破坏。 2. **模型定义**：在进行非线性分析之前，需要正确地定义模型，包括几何、材料属性、边界条件和荷载。指南将详细解释如何在Nastran中设置这些参数。 3. **输入约定与 Bulk Data File**：Nastran的输入文件，即Bulk Data File，是定义模型的关键。文件中的输入约定和段描述有助于理解如何组织数据。此外，对于熟悉MSC.Marc的高级用户，指南还将介绍包含文件选项。 4. **运行和编辑模型**：指南展示了如何运行现有的非线性模型，以及如何使用MSC.Patran生成和编辑Bulk Data File，这为用户提供了直观的图形界面来管理模型数据。 5. **输出请求和结果**：输出请求部分讨论了在非线性分析中如何选择和定义要提取的应力和应变量。结果文件部分则解释了在分析过程中产生的各种文件类型，以及如何使用MSC.Patran进行后处理，以可视化和理解计算结果。 6. **解算方法和策略**：指南深入到非线性分析的求解过程，包括线性静态分析程序，以及如何施加约束和荷载。这些方法和策略对于确保分析的准确性和稳定性至关重要。 7. **其他相关文档**：除了本指南，用户还需要了解其他MSC.Nastran、MSC.Marc和MSC.Patran的文档，这些文档提供了更专门的信息，帮助用户更全面地掌握非线性分析工具的使用。《MSC.Nastran隐式非线性(SOL 600)用户指南》是一个全面的资源，它为工程师提供了必要的工具和知识，以理解和执行复杂的非线性结构分析任务，涵盖了从模型构建到结果解释的全过程。

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Introduction

5. MSC.Nastran Implicit Nonlinear (SOL 600) supports the following loads and

boundary conditions:

• Constrained nodal displacements (zero displacements at specified

degrees-of-freedom).

• Enforced nodal displacements (non-zero displacements at specified

degrees-of-freedom in the nodal coordinate system).

• Forces applied to nodes in the nodal coordinate system.

• Pressures applied to element edges or faces, including strain-rate

controlled application for super-plastic forming simulations.

• Temperature applied to nodes. Temperature can be applied as a load

in a structural analysis. The reference temperature is user definable.

• Inertial body forces. Linear acceleration and rotational velocity can be

applied in the global coordinate system.

• Beams can be loaded by nodal forces, body forces, prescribed

displacements and loads due to thermal expansion and contraction.

• Contact between two bodies can be defined by selecting the

contacting bodies and defining the contact interaction properties.

6. MSC.Nastran Implicit Nonlinear (SOL 600) supports isotropic, orthotropic

and anisotropic material properties. Temperature dependent isotropic and

orthotropic material properties can be defined for elastic, elastic-plastic,

hyper-elastic, visco-elastic (no temperature dependence for visco-elastic)

and creep constitutive models. Nonlinear elastic-plastic materials can be

defined by specifying piecewise linear stress-strain curves, which may be

temperature dependent.

7. Physical properties can be associated with MSC.Nastran Implicit Nonlinear

(SOL 600) elements such as the cross-sectional properties of the beam

element, the area of the beam and rod elements, the thickness of shell, plane

stress, and membrane elements, spring parameters, masses, gap element

parameters, the alternate material coordinate frame for solid elements and

material IDs.

8. Laminated composite solid and shell elements are supported in

MSC.Nastran Implicit Nonlinear (SOL 600) through the PCOMP card of the

materials capability. Each layer has its own material, thickness, and

orientation and may represent linear or nonlinear material behavior. Failure

index calculations are also supported.

9. Analysis jobs consisting of (possibly) complex loading histories (such as

would occur in a multi-step manufacturing process) for MSC.Nastran

Implicit Nonlinear (SOL 600) are defined using subcases. A single subcase

may represent the entire analysis, or may be one step in a multi-step

Introduction

1.4 How SOL 600 Solves Nonlinear Problems

The primary steps in running a MSC.Nastran Implicit Nonlinear (SOL 600) analysis

are as follows:

1. Read MSC.Nastran Input File in IFP (input file processor) as in other

MSC.Nastran solution sequences.

2. Convert MSC.Nastran input to MSC.Marc input and write out a MSC.Marc

input deck (jid.marc.dat in IFP).

3. If there are no input errors, execute MSC.Marc.

4. If you request, do any of the following:

a. Translate MSC.Marc’s t16 file to obtain MSC.Nastran op2 or xdb

output (this is done by code in MSC.Nastran that created output op2

data blocks on a file, which we call the f11 file, then generating DMAP

on the fly to use inputt2 to placed the f11 datablocks into the

MSC.Nastran database, and finally use OUTPUT2 to produce an OP2

file which has the geometry datablocks and the f11 output datablocks

all in one file (or similar DMAP to generate an xdb file with geometry

and output datablocks.

b. As in step a, DMAP can be extended to produce printed output in

the.f06 file or punched output in the .pch file having the exact formats

MSC.Nastran uses for all other solution sequences (this is done by

generating OFP DMAP on the fly).

c. Copy MSC.Marc’s output file (known as the .out file) to the .f06 file

with or without changing any text strings. This output will have the

MSC.Marc formats, but names such as MSC.Marc can be changed to

any desired user name (for example MSC.Nastran Implicit Nonlinear).

It is strongly suggested that steps b and c are not both done in the

same run, or the f06 file output could become confusing.

d. Retain or delete the MSC.Marc input and output files (which normally

consist of jid.marc.dat, jid.marc.out, jid.marc.sts, jid.marc.log,

jid.marc.t16 and possibly others which have the name jid.marc.*).

The process of reading input data from a MSC.Nastran Input File, translating the

model data to a MSC.Marc input file, running a MSC.Marc solution, and translating

back the results files is shown in the flowchart that follows.

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