热应力.docx
《热应力.docx》由会员分享,可在线阅读,更多相关《热应力.docx(20页珍藏版)》请在冰豆网上搜索。
热应力
302页:
实例1——圆简内部热应力分折:
有一无限长圆筒,其核截面结构如图13—1所示,简内壁温度为200℃,外壁温度为20℃,圆筒材料参数如表13.1所示,求圆筒内的温度场、应力场分布。
该问题属于轴对称问题。
由于圆筒无限长,忽略圆筒端部的热损失。
沿圆筒纵截面取宽度为10M的如图13—2所示的矩形截面作为几何模型。
在求解过程中采用间接求解法和直接求解法两种方法进行求解。
间接法是先选择热分析单元,对圆筒进行热分析,然后将热分析单元转化为相应的结构单元,对圆筒进行结构分析;直接法是采用热应力藕合单元,对圆筒进行热力藕合分析。
/filname,exercise1-jianjie
/title,thermalstressesinalong
/prep7$Et,1,plane55
Keyopt,1,3,1$Mp,kxx,1,70
Rectng,0.1,0.15,0,0.01$Lsel,s,,,1,3,2
Lesize,all,,,20$Lsel,s,,,2,4,2
Lesize,all,,,5$Amesh,1$Finish
/solu$Antype,static
Lsel,s,,,4$Nsll,s,1$d,all,temp,200
lsel,s,,,2$nsll,s,1$d,all,temp,20
allsel$outpr,basic,all
solve$finish
/post1$Set,last
/plopts,info,on
Plnsol,temp$Finish
/prep7$Etchg,tts
Keyopt,1,3,1$Keyopt,1,6,1
Mp,ex,1,220e9$Mp,alpx,,1,3e-6$Mp,prxy,1,0.28
Lsel,s,,,4$Nsll,s,1$Cp,8,ux,all
Lsel,s,,,2$Nsll,s,1$Cp,9,ux,all
Allsel$Finish
/solu$Antype,static
D,all,uy,0$Ldread,temp,,,,,,rth
Allsel$Solve$Finish
/post1
/title,radialstresscontours
Plnsol,s,x
/title,axialstresscontours
Plnsol,s,y
/title,circularstresscontours
Plnsol,s,z
/title,equvialentstresscontours
Plnsol,s,eqv$finish
/filname,exercise1-zhijie
/title,thermalstressesinalong
/prep7$Et,1,plane13
Keyopt,1,1,4$Keyopt,1,3,1
Mp,ex,1,220e9$Mp,alpx,,1,3e-6$Mp,prxy,1,0.28
MP,KXX,1,70
Rectng,0.1,0.15,0,0.01$Lsel,s,,,1,3,2
Lesize,all,,,20$Lsel,s,,,2,4,2
Lesize,all,,,5$Amesh,1
Lsel,s,,,4$Nsll,s,1$Cp,8,ux,all
Lsel,s,,,2$Nsll,s,1$Cp,9,ux,all
ALLSEL$Finish
/solu$Antype,static
Lsel,s,,,4$Nsll,s,1$d,all,temp,200
lsel,s,,,2$nsll,s,1$d,all,temp,20
allsel$outpr,basic,all
solve$finish
/post1$Set,last
/plopts,info,on
Plnsol,temp
/title,radialstresscontours
Plnsol,s,x
/title,axialstresscontours
Plnsol,s,y
/title,circularstresscontours
Plnsol,s,z
/title,equvialentstresscontours
Plnsol,s,eqv$finish
318页实例2——冷却栅管的热应力分析
图中为一冷却栅管的轴对称结构示意图,其中管内为热流体,温度为200℃,压力为10Mp,对流系数为110W/(m2·℃);管外为空气,温度为25℃,对流系数为30w/(mz.℃)。
栅管材料参数如表13—2所示,求栅管内的温度场和应力场分布。
根据对称性,并在图示边界线段上施加对称边界约束,进行热应力分析求解。
FINISH$/CLEA
/filname,exercise2
/title,thermalstressesinanaxisymmetricalpipe
/prep7$et,1,plane13$Keyopt,1,1,4
mp,ex,1,200e9$Mp,alpx,1,1.5e-5
mp,prxy,1,0.3$mp,kxx,1,30
rectang,0.12,0.16,0,0.07$rectang,0.16,0.4,0.025,0.045$rectang,0.38,0.4,0.015,0.055
k,100,0.15,0.055$k,101,0.15,0.015
aadd,all$numcmp,line
lfillt,8,12,0.01$lfillt,7,9,0.01
ldiv,9,0.8$ldiv,12,0.8
L2tan,12,-6$L2tan,9,5
al,15,16,17$al,18,19,20
al,14,22,23$al,13,21,24
aadd,1,2,4$aadd,5,6
aadd,1,3$numcmp,line
esize,0.0025$wpstyle,,,,,,,,1
csys,4$kwpave,100
wprot,0,0,90$asbw,2
wprot,0,90$asbw,3
kwpave,101$asbw,4
kwpave,16$wprot,0,-90$asbw,5
kwpave,19$asbw,6
kwpave,12$asbw,7
amesh,1,3$amesh,5,8,3
amap,4,15,16,18,17$amap,6,19,20,9,12
allsel$wpstyle,,,,,,,,0
csys,0$nsel,s,loc,y,0
cp,1,uy,all$allsel$finish
/solu$antype,static
Sfl,3,pres,10e6$Sfl,3,conv,110,,200
Lsel,s,,,4,18$Lsel,a,,,20,21
Sfl,all,conv,30,,25$Lsel,s,,,17,20,3
Dl,all,,symm$lsel,s,,,18,21,3
Dl,all,,symm$allsel
Outpr,basic,all$Solve$Finish
/post1$Set,last
/title,temperaturecontours
Plnsol,temp
/title,sumdisplamentlcontours
Plnsol,u,sum
/title,radialstresscontours
Plnsol,s,x
/title,axialstresscontours
Plnsol,s,y
/title,circularstresscontours
Plnsol,s,z
/title,equvialentstresscontours
Plnsol,s,eqv
/expand,9,axis,,,10
/view,1,1,1,1
/title,temperaturecontours
Plnsol,temp
/title,equvialentstresscontours
Plnsol,s,eqv$finish
332页实例3——两无限长平扳热膨胀分析:
有两块厚度均为0.02mm的无限长平板1和2,受如图13—52所示约束。
平板初始温度为20℃,求将其加热到800℃时平板内部的应力场分布(平板材料参数见表)。
根据题意,忽略平板沿长度方向的端面效应,将问题简化为平面应变问题。
在分析过程中取两平板的横截面建立几何模型,并选取plane13热一结构锅台单元进行求解。
/filname,exercise3
/title,thermalexpansionbetweentwoinfiniteflat
/prep7$et,1,plane13$Keyopt,1,1,4
mp,alpx,1,1.5e-5$mp,ex,1,1.0e11
mp,prxy,1,0.25$mp,kxx,1,65
mp,prxy,2,0.3$mp,ex,2,2.0e11
mp,kxx,2,30$mp,alpx,2,2.5e-5
rectng,0,0.1,0,0.02$rectng,0.1,0.3,0,0.02
esize,0.02$mat,1$amesh,1$mat,2$amesh,2
nummrg,all$numcmp,all
/solu$antype,static
Autots,on$lsel,s,,,4,6,2
Nsll,s,1$d,all,ux
Tref,20$bfunif,temp,800
Allsel$solve
/post1$Set,last
/plopts,info,on
/title,temperaturecontours
Plnsol,temp
/title,sumdisplamentlcontours
Plnsol,u,sum
/title,xdirectiondisplamentcontours
Plnsol,u,x
/title,ydirectiondisplamentcontours
Plnsol,u,y
/title,sumdirectiondisplamentcontours
Plnsol,u,sum
/title,xdirectionstresscontours
Plnsol,s,x
/title,ydirectionstresscontours
Plnsol,s,y
/title,equvialentstresscontours
Plnsol,s,eqv$finish
340页实例4——包含焊缝的金属板热膨胀分析
某一平板由钢板和铁板焊接而成,焊接材料为铜,平板尺寸为1×1×0.2,横截面结构如图13—68所示。
平板初始温度为800℃,将平板放置于空气中进行冷却,周围空气温度为30℃,对流系数为110W/(m2.℃)。
求10分钟后平板内部的温度场及应力场分布(材料参数见表134)。
属于瞬态热应力问题,选择整体平板建立几何模型,选取solid5热一结构耦合单元进行求解。
/filname,exercise4
/title,thermalstressesinsectionsincludingweldingseam
/prep7$et,1,plane13
Keyopt,1,1,4$et,2,solid5
Mp,alpx,1,1.06e-5$mp,kxx,1,66.6
Mp,dens,1,7800$mp,c,1,460
Mptemp,,30,200,400,600,800
Mpdata,ex,1,,2.06e11,1.92e11,1.75e11,1.53e11,1.25e11
Mpdata,prxy,1,,0.3,0.3,0.3,0.3,0.3
Tb,bkin,1,5!
指定材料模型
Tbtemp,30$Tbdata,1,1.40e9,2.06e10
Tbtemp,200$Tbdata,1,1.330e9,1.98e10
Tbtemp,400$Tbdata,1,1.15e9,1.83e10
Tbtemp,600$Tbdata,1,0.92e9,1.56e10
Tbtemp,800$Tbdata,1,0.68e9,1.12e10
MP,ALPX,2,1.75E-5$MP,KXX,2,383
MP,DENS,2,8900$MP,C,2,390
MPDATA,EX,2,,1.03E11,0.99E11,0.90E11,0.79E11,0.58E11
MPDATA,PRXY,2,,0.3,0.3,0.3,0.3,0.3
TB,BKIN,2,5
TBTEMP,30$TBDATA,1,0.9E9,1.03E10
TBTEMP,200$TBDATA,1,0.85E9,0.98E10
TBTEMP,400$TBDATA,1,0.75E9,0.89E10
TBTEMP,600$TBDATA,1,0.62E9,0.75E10
TBTEMP,800$TBDATA,1,0.45E9,0.52E10
MP,ALPX,3,5.87E-6$MP,KXX,3,46.5
MP,DENS,3,7000$MP,C,3,450
MPDATA,EX,3,,1.18E11,1.09E11,0.93E11,0.75E11,0.52e11
MPDATA,PRXY,3,,0.3,0.3,0.3,0.3,0.3
TB,BKIN,3,5
TBTEMP,30$TBDATA,1,1.04E9,1.18E10
TBTEMP,200$TBDATA,1,1.01E9,1.02E10
TBTEMP,400$TBDATA,1,0.91E9,0.86E10
TBTEMP,600$TBDATA,1,0.76E9,0.69E10
TBTEMP,800$TBDATA,1,0.56E9,0.51E10
K,1$K,2,0.5
K,3,1$K,4,0,0.2
K,5,0.4,0.2$K,6,0.6,0.2$K,7,1,0.2
A,1,2,5,4$A,2,3,7,6
CSYS,1$L,6,5$AL,2,8,9
MSHKEY,1$ESIZE,0.05
AMESH,1,3,1$ESIZE,,10
TYPE,2$MAT,1$VOFFST,1,1
MAT,3$VOFFST,2,1
MAT,2$VOFFST,3,-1$ACLEAR,1,3,1
NUMMRG,ALL$NUMCMP,ALL$ALLSEL
/SOLU$ANTYPE,4
TRNOPT,FULL$TIMINT,1,STRUCT
TIMINT,1,THERM$TIMINT,0,MAG
TIMINT,0,ELECT$TINTP,0.005,,,-1,0.5,0.2
TIME,600$DELTIM,30,10,100
AUTOTS,ON$KBC,1
OUTRES,,ALL$BFUNIF,TEMP,800
ASEL,U,,,6,13,7$NSLA,S,1
SF,ALL,CONV,110,30$ALLSEL
SOLVE$FINISH
/POST1
SET,LAST
/TITLE,TEMPERATURECONTOURS
PLNSOL,TEMP
/TITLE,XDIRECTIONDISPLAMENTCONTOURS
PLNSOL,U,X
/TITLE,YDIRECTIONDISPLAMENTCONTOURS
PLNSOL,U,Y
/TITLE,ZDIRECTIONDISPLAMENTCONTOURS
PLNSOL,U,Z
/TITLE,SUMDIRECTIONDISPLAMENTCONTOURS
PLNSOL,U,SUM
/TITLE,XDIRECTIONSTRESSCONTOURS
PLNSOL,S,X
/TITLE,YDIRECTIONSTRESSCONTOURS
PLNSOL,S,Y
/TITLE,ZDIRECTIONSTRESSCONTOURS
PLNSOL,S,Z
/TITLE,EQUVIALENTDIRECTIONSTRESSCONTOURS
PLNSOL,S,EQV
353页:
实例5——连杆热应力分析
图示为一连杆,其初始温度为100℃,现将连杆放置于空气中进行冷却,周围空气温度为20℃,对流系数为95W/(m2·℃)。
求:
1)5分钟后平板内部的温度场及应力场分布;2)A、B两点温度随时间的变化关系曲线(材料参数见表13—5)。
该问题属于瞬态热应力问题,选取连杆建立几何模型,并选强solid98十节点四面体热结构耦合单元进行求解。
/filname,exercise5
/title,thermalstressanalysistoaconnectingrod
/prep7$Et,1,solid98
Mp,alpx,1,2.05e-5$Mp,prxy,1,0.3
Mp,kxx,1,16.3$Mp,ex,1,220e9
Mp,c,1,300$Mp,dens,1,7800
K,1,-0.18,0,0$K,2,-0.18,0.035,0
K,3,-0.14,0.035,0$L,1,2
L,2,3$Csys,1
K,4,0.14,135,0$K,5,0.1,180,0
K,6,0.1,135,0$L,3,4
L,5,6$LFILLT,2,3,0.02
Wprota,45$Csys,4
Allsel$Lsymm,x,1,5
Wprota,-45$Wpoffs,0.7
Cswpla,11,1
K,16,0.07,0,0$K,17,0.07,135,0
K,18,0.04,0,0$K,19,0.04,180,0
L,16,17$L,18,19
Csys,0
Lsymm,x,6,7$Lsymm,x,4,9,5
K,28,0.25,0.055,0$K,29,0.52,0.045,0
Bsplin,17,29,28,22
Lfillt,14,17,0.03$Lfillt,11,17,0.15
Lsymm,y,1,19$Nummrg,all
Lsel,s,,,12,31,19$Al,all
Lsel,s,,,4,9,5$Lsel,a,,,15,16
Lsel,a,,,23,28,5$Lsel,a,,,34,35$Al,all
Lsel,s,,,1,3$Lsel,a,,,5,8
Lsel,a,,,10,11$Lsel,a,,,13,14
Lsel,a,,,17,22$Lsel,a,,,24,27
Lsel,a,,,29,30$Lsel,a,,,32,33
Lsel,a,,,36,38$Al,all$Allsel
Asba,3,1$Asba,4,2
Numcmp,all$Voffst,1,0.02$Smrt,6
Mshape,1,3d$Mshkey,0
Vmesh,1$Wpstyle,,,,,,,,0$Save
/SOLU
ANTYPE,4$TRNOPT,FULL
TIMINT,1,STRUCT$TIMINT,1,THERM
TIMINT,0,ELECT$TINTP,0.005,,,-1,0.5,-1
TIME,300$DELTIM,4,4,20
AUTOTS,ON$KBC,1
OUTRES,,ALL$BFUNIF,TEMP,100
ASEL,s,,,all$NSLA,S,1
SF,ALL,CONV,95,20$ALLSEL
SOLVE$FINISH
/POST1
SET,LAST
/TITLE,TEMPERATURECONTOURS
PLNSOL,TEMP
/TITLE,SUMDISPLAMENTCONTOURS
PLNSOL,U,SUM
/TITLE,XDIRECTIONSTRESSCONTOURS
PLNSOL,S,X
/TITLE,YDIRECTIONSTRESSCONTOURS
PLNSOL,S,Y
/TITLE,ZDIRECTIONSTRESSCONTOURS
PLNSOL,S,Z
/TITLE,EQUVIALENTDIRECTIONSTRESSCONTOURS
PLNSOL,S,EQV
/POST26
/AXLAB,A,TIME,(SEC)
/AXLAB,Y,TEMPERATURE
/GTHK,AXIS,3
/GTHK,CURVE,3
/COLOR,CURVE,MRED,1
WPCSYS,-1
NSEL,S,LOC,X,-0.18
NSEL,R,LOC,Y,0
NSEL,R,LOC,Z,0
*GET,NODE1,NODE,,NUM,MAX
NSEL,S,LOC,X,0.77
NSEL,R,LOC,Y,0
NSEL,R,LOC,Z,0
*GET,NODE2,NODE,,NUM,MAX
NSOL,2,NODE1,TEMP
NSOL,3,NODE2,TEMP
/TITLE,CURVEDECRIBEDTHERELATIONBETWEENTEPERATUREANDTIMEATPOINTA
PLVAR,2
/TITLE,CURVEDECRIBEDTHERELATIONBETWEENTEPERATUREANDTIMEATPOINTB
PLVAR,3
FINISH
371页:
实例6——热喷涂过程中熔滴夜基体表面沉积凝固后的残余应力分析
热喷徐过程中,一金属N6熔滴以一定速度在无限大碳钢基体表面沉积后,发生散流变形的同时与基休有热变换作用,最终凝固成圆片状固体颗粒。
其纵剖面形状及几何尺寸如图13—l16所示。
金属Ni与碳钢的基本物性参数如表13—6所示。
假定颗粒由最初的熔点温度1454℃冷却到室温25℃,忽略对流带来的影响,月假定平均制备温度625℃为参考温度。
若定义路径1为线段AB,定义路径2为线段BC,求:
1)熔滴经过Iooy5时的温度场分布。
2)点A、点B的温度随时间的变化曲线。
3)100隅时,沿路径1、路径2颗粒的轴向应力变化曲线与径向应力变化曲线。
4)100y5时,熔滴的轴向应力场与径向应力场。
5)100隅时,在歹维方向熔滴(取I/4份)的轴向应力场与径向应力场。
热喷徐过程中,一金属N6熔滴以一定速度在无限大碳钢基体表面沉积后,发生散流变
形的同时与基休有热变换作用,最终凝固成圆片状固体颗粒。
其纵剖面形状及几何尺寸如图
13—l16所示。
金属Ni与碳钢的基本物性参数如表13—6所示。
假定颗粒由最初的熔点温度1454
℃冷却到室温25℃,忽略对流带来的影响,月假定平均制备温度625℃为参考温度。
若定义
路径1为线段AB,定义路径2为线段BC,求:
1)熔滴经过Iooy5时的温度场分布。
2)点A、点B的温度随时间的变化曲线。
3)100隅时,沿路径1、路径2颗粒的轴向应力