结构整体温升变形仿真,温升应力 OptiStruct
假设一个结构,初始温度10度,温升后变成200度,需要研究它的结构变形。
温度边界条件
这就是典型的热应力工况。我们可以通过temp(initial)和temp(load)分别指定初始和终止温度。
TEMPERATURE(INITIAL) = 6
TEMPERATURE(LOAD) = 7
工况分析序列
为了查看逐渐温升过程中的变形情况,分析工况设定为非线性准静态NLSTAT (nonlinear static)。
使用NLPARM,NLOUT等常规非线性分析控制卡片,SPC指定结构约束边界条件。
SPC = 5
NLPARM = 1
NLOUT = 2
材料设置
Mat1卡片中,Tref指定材料不变形时的温度。如20度。
MAT1 1210000.0 0.3 7.85-9 1.15-5 20.0
输出请求
NLSTAT默认只输出位移和应力应变,若需要输出温度加载信息,需要通过oload卡片指定。
OLOAD = ALL
OLOAD
I/O Options and Subcase Information EntryUsed to request applied load vector output temperature load output, and applied power output for all subcases or individual subcases, respectively.

最终仿真动画

OptiStruct求解文件
感兴趣的朋友,可以拷贝以下代码,另存为.fem格式,提交OptiStruct求解器即可求解。
$$
$$ Optistruct Input Deck Generated by HyperMesh Version : 2025.1.0.28
$$ Generated using HyperMesh-Optistruct Template Version : 2025.1.0.28-229460
$$
$$ Template: optistruct
$$
$$
$$ optistruct
$
OUTPUT,HTML,YES
SCREEN OUT
DISPLACEMENT = ALL
STRESS = ALL
THERMAL = ALL
$$------------------------------------------------------------------------------$
$$ Case Control Cards $
$$------------------------------------------------------------------------------$
$
$HMNAME LOADSTEP 2"struct" 9
$
SUBCASE 2
LABEL struct
ANALYSIS NLSTAT
SPC = 5
NLPARM = 1
NLOUT = 2
TEMPERATURE(INITIAL) = 6
TEMPERATURE(LOAD) = 7
OLOAD = ALL
THERMAL = ALL
$
BEGIN BULK
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$
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$$------------------------------------------------------------------------------$
$$ HyperMesh name and color information for generic components $
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$$
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$$------------------------------------------------------------------------------$
$$ HyperMesh Commands for loadcollectors name and color information $
$$------------------------------------------------------------------------------$
$HMNAME LOADCOL 5"SPC"
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$$
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$
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$$
TEMPD 7 200.0
$
$$
$$ Nonlinear Parameters
$$
$
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$
$$
$$ Output Parameters
$$
$
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NLOUT 2NINT 10
$$
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$$
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type="string" name="UdmxmlString_HmOccurrenceTrueColor">12568233</udmxml:Attribute></udmxml:Attributes></udmxml:Entity></udmxml:EntityCollection><udmxml:RelationCollection xsi:type="udmxml:RelationCollectionCType"/><udmxml:RootEntities xsi:type="udmxml:RootEntityCollectionCType"><udmxml:ItemId>3043e39cfd3619408b79d733c9c0cc12:0</udmxml:ItemId></udmxml:RootEntities></UDM>
$$</Altair_XML_Export>
$$<Altair_Model_Export/>