??·????????????????????????
?й????е?????????
1.????????s??
???????????????????????????????????????????????????????????????????????????????Σ????????????????????????????????С?????????????
??Ps???????s??????????Fo?????????????????????s =Ps/Fo(MPa)??MPa???????????N??????/mm2????MPa=106Pa??Pa???????=N/m2??
??·?????????????????????????
????????????????????磬????????????й?????????????ì??????????????????????????????????????????????????λ??????????????????????????????????????
??·????????????????????????
10??2000??8000 21??
10??2000??8000 52??
10??2000??8000 42??
10??2000??8000 35??
12??1800??8000 42??
12??2000??8000 42??
12??2000??8000 32??
14??2000??8000 65??
????8*1810*8000??q420q??·?????????????????????С??????
