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1、材料力学习题答案、(7,-10MPa,rvV=-15MPaa)xA)]、a,=47.3MPa,=7.3MPaD)x入)=-12.5MPa,rvV=-65MPac)AA八cr,=35MPa,rrV=-60.6MPaa.=0.49MPa,r..=20.5MPac)人X〉门6=-38.2MPa,rvV=OMPaa)6=57MPa,cr2=-7MPa,a,^=32MPac)(T,=25MPa,6=—25MPa,c^=45°,rmax=25MPa⑴cr,=11.2MPa,cr2=-71.2MPa,^=
2、37°59rniax=41.2MPae)cr,=4.7MPa,cr2=-84.7MPa,aa=13°17>niax=44.7MPa「)s=37MPa,6=—27MPa,Q”=-19°20;rniax=32MPa}ax=ay.=5()MPa=84.7MPa,6=2()聊&,<^3=~4*7MPa,h=1()()MPa,‘2=8°°(MPa)2,I3=24000(mpq3a)6=7()“Pa,(72=
3、60MPa4、=4.73°:rnm=6.08X108rad,avmax^^O.250。2・2・・22・£x・=xcos(p+£ySin(p+rxycos^sin^,£y・=^xsin(p+£ycos(p・rxysin^cos^r£才=£门yy=(£丁£Jsin2°+rxycos2^tYy^=ryzcos^・rzxsin^?,rz*x>=ryzsin^+rzxcos^o£450=xJ2qf亡=£xcos*^?+fySirT0+rxycos^sin(j9fey=exsin*^+£ycos^・rxysin^cos^T^z-=0,rxy=(£y・十x)sin2^+rxycos2^tryz-=0,rz=0。£m
5、ax=150X10"m/m,£罰=・150X106m/m,rmax=300X10'6rad。£3=-200X10'6m/m,£max=290X1O'6m/m,£,nin=-210XIO'6m/m,Ymax=500X106rad。830XIO'6m/m。£x・=-335X1O'6m/m,£y-=-25XIO'6m/m,rxy=-237X10'6rad。£x-=-523XIO'6m/m,£y=243X106m/m,rxy=-663X106rad。fx=253X10-6m/m。I)^max=H30X10-6m/m,niin=-l28XIO'6m/m,4°35',94°35';2)=940XIO'
6、6m/m,£品=340X10“m/m,19°20',109°20'。E=70GPa,v=().334-24-3E=208GPatv=0.32cr=10OMPa,s=5x104,F=7.85kN4-4F=20kN4-5b]=53.8MPa6=-26.3MPa4-6a)<9=0.1x10re=22.5xlO3J/m3,=21.7x103J/m3b)<7=0.12x10e=20.1xl03J/m=18.9x10J/mc)0=O・26xIO]e=48.1x!03J/m^=42.5x10J/4-94-104-114-125-3c5-45=0.<72=-19.8MPa^<7.=-60MPava
7、)s=6=0,b)6-6-]-vq,6=_qAZ>=-0.00126mmAV=538mm3£和。=66.0x106tma.x=16.7MPa,ocmax=20MPa5-5oA〃=-47・4MPa,ocr=104MPaao(MPa)t(MPa)0°100030°75-43.345°50-5060°25-43.35-6F=25.13kN90°005-7o(=100MPa5-8omax=76.4MPaFL5-10iift=3励