Giáo trình ma sát học - Chương 4 ppt

II (JHUUNG4 L.i L :r-·~ -:~J;' ,) .~ ;;IPh1'r<1ng>tffiih 'CCY'6iH7tf£1i~it:c4i~tH1~mAng dau gifta hai ~ mft tiip xuc IAphuong trin.tt·BoWsonVAltig~ns~mf1 v (E'p.!) h = 0,324 ,p(a E') 0,6(T)0 ) 0,7 , (__.;. )<>,13 E',p P Trong d6 a. - ~ 86 thay d6i dt) nhl1t. dAu the{} Ap IVC, > 49 " \ I - .j~ "'':'j-~:''''; ,~~L~ ;-:t;) ')(~}d l~~',;_fd.a4i.1i;<:' '~ '_. .' n ,,-,DO nhlvt d'&!w.J\nc.j.r.aa,4.11:n;)., I • I . v;· "." I" '1.,, _'1 i-,-~ I'fU!"n~~~ n11, ~.'. , "- V - VOntoe vong trnng binh; ,i ;, ,+, .', ".' vl.+ V" -"':'.; " [.~i:', ' , •. , ',,1 ••. " I .f - J~n " ':1 J ~ t.),; __,,J i.i "i't'_/ )"11;< q!~~~ L:.r.:1d •. ;if" ~. 1l. ::: T __ ~ _ ( •••• Ie.1, . 1 (•• JA ~:nL:' .:{ j("i~ .:t ( C ;l:'iTI1jth 'T?\~l Ifl'fPUljdlilJ :"ilt_~ nd 2 i\.H <:d< );\c; J _:~! F Moduyn dAD h6i v.t.tli~u E E'::: [KG/cm2i . ,: try·\>1;,. i i' ~r;': ' .; '·ir' . U -Hes6Poi~D.h '" fl"l" '[r.' :' ,;." ~ • ~- _ ._'_, _" ,1. 1-Cbi6udAititpxuc[cml,iid: ;;f~'.; " P - Tii trqIlg lAcdlplg [KG]; - it' A ;1;'H! ;iJ .'-J 'J<-~_t ,(~~ r"i',oJ [ll.\ Ji~;l~ ; ~ Titi1uDh SO sinh h tinh theo cOng thirc trtn vln tOng c~~~ .• )~~.be ~tti6p ~iI~ . yew c&uchi~u dAy cDa'm)ng dIi pbii 100 hon tOng cAciniP JOO ~ ll1Jt. 62. -TiJih theo nhi~ d~'t(tcthOiciiaBlok' ".,' ,. ~Gia;thia v~nhi~t db'firc thrrl'cluqc Blok gioi ~u vA thie"t 1"'. Nhi~u lAc gii <fi pMt triin vA hoAD'bbliih'~ thuytt nAy bing nhiing ~ s6 inh huang: >,Ii A '.(\ , Gii tbi6t cU8'~ itt\l'_ '~!!d6i'vl*'tn6i t6 hqp dau vA kim loai t6n tai mOt JMtI d61itH!b1ch'uAn"khi dAu mat di nhfing <ftc·tinh b61tit1D\lilkitmt~·1JiO *iftlr<1C~ mA.tti6p xuc • ~"V 6 .•• 50 ,. ~ I~ ail._. Kbi d6 nhilng ~ tInh ho8 h<J.caia ~: d6i vAkhOngtbam gi8~lIhm1g'pbin 'I11ig hoA'hQCvOi kim 104i. ' " ':.i1,' ,; Trong quA trinh lAmvi~e ca' Iiai 'Chititt vi d\l cti8 hai con lin hay hai bAnh lriilR xuA'thi~n nhi~t d~ tire thm cao dAng ki f4ieh6titp xue tfre thm. ' . i_f~HI r; l i'>~ !1T-i.1 j' p! ~=tq.+~., J • " t If-Nhi~t d() t6nitlJi viing titpxueJ to - Nhi~t d() tmnibum ci chi tiffC ' e -Nhitt dOtire thm!I;, : JU J ::<i,r ,'; , •• ' } (. t _: ! ~_, B6 mAtan toAn khi thoa man cti~uki~n : #' )2 ;·'\1-G';31~·T)~,.I~i:'i:{;·, I}··_,dr dL;'- it dn.f,., 111 '!Pi d n'£lt'[ "~In ;:1' " J.1.Pn. (VI - v2) e = 0,83 '1 7: i;-;?~:-"G-~:U~ '-';i-i'f-~:;m-t,: ;o I," "';",," ,,,~AJTXJ·C~':l A;,f;.J'}~."f:l.C2v2 JbI <, ',: ~;c1'6f~~_> 1!4 f~ ii ;-!1 ~ t->, ',l l, -j~{t/ iL ~ J.l - H~ s6 ma sal:;\, .i ,'.' ,. A. :';' WI , J - - "." ' :.~ ,,'. 1>._T.'trnnJrA YIIKf.':lrnrhh., f.Jj. H)~lt·". ;~) &#~~,., ,.~J •. " 1l!11.,Y2; v~4:~~,vOq;.,r: ',,' '. ",' ,/y ,-:".T~L~;"!t~"ti~lmml: ' ', 51 II 51 , Ie, L •. ';.J'" 55 510 ~H~n,~~, rj~~)! )',. , tE ~ '. J' ) ~ = + ~ .•T~-mtJ~1 I , (~-;; ~)v~'~~l::~~,.~55 - H , n":itlf!l './ •.; • 52 52 "{ . ; -;" _; ,f. i ~ Kh6 kbin trong ,,*i~iidIJQ&.~g .thirc tItn Il DC dinh chIDh DC vi tri tirc tbm· All rim. ~hA~~Ar· tii tron b6n •.• J ~ ~~t1""Y'" • g. kinh ~ S§:IJM\"Ji·~ II 1mh ~11911 j£:r ;;(1 ;' it!: . " ~l.d~-! CH"_~:H~/ ~-):! :(.~!" •• " ::f)· \i .,; .~ U::~cr~~ttTt~\i?~;~pc::.thirC c6 Plmang trinh Nitman c6 dIplg : II 53 -rr"nl ' lib-=T:dI1A +"." .j,:.Ji .:, ~; _______ "',. I . - - g.P.A , , !~.;.;) 1 53 II .5 Tinhht.~_ •• ,•• ~•••••: f!>;' ~ so an toin~khii,birpb'hdrWtr6c: c·,,~·, '/fn.· . ·,·• .idr~·.·' .1, .~~:A''" ."'1.,"" • ",-, ~l" .• ,\;,; UIJ. , ,~ KZ = __.1- '- _ . Yz Trong d6 : " iH,/ U Krest' -eJUs6 inh huang cUB dilu. II ;; 54 J"T !J! 2.7 94- ;;.J.,;. 54 .rlmd .<> - so inh huang - c6<M~ d6 tbi.: 3 2 kTcst ~ 1 i 03- ~~ 0.6\' Oll ,I O,J 0,2 I a 1! , 0 4 8 121 16 v II,' joa*""w~ ••••••••• ,.,:, :f"_t ; ~}l: tJ")ldii ~: tf, ~:ttH~ fH~ ·~HH.>'r;b 'fL·J ~Iflt(j!i!r ·~-;t!d t; Hi Trang d6 emax dtl Kc _~ ialdllJp.( •• i't~riIlg; .0: It. J+";Di'6nlkioh,vclng.~L ,ii'"~ dl ;i _an 56 tii. trQng ~»inh trong ring pl.,; i± 1 Kc = .' , . b.dn Sinal Cosal 'J! -:>iplll i 55 <'_ Ii H~ SO an tom theo tr6c, yen can : Ki X z = >= 3 Kc" " ••6 Tinh h~ s6 an toan tr6c theoMulleta. • '. , Kt Yli ' X z = •.•~ ~ ~ >= Xz min ·v.dl M.Q.Kp.~.qB ( ~-)213 •. '~~ ' 'i'';' T A~ "'"')'" ;, ;,", ronguu' .' " ." ,,' 'ML~f:'lJ(rtc1ii8~a dljllti,fitr~U1bai.··(11' '-' .: . r ' A muyc ~ . Xz min ~Slf8n toaD: '~'c6thll(y til t:2, 5. M - ph1}thnt)c vAo~ hqc fang, . (i +I)1i [q,~.i~,1};!JJ_: ~~__~~ ]413 M =[ l-'-_.:. __ ~_'_ _ ("q (i + l>+,*'t Lcf)'(' i'.l'Y~l')4~O¥!ff(T'- q) ~ ' 7- ,. :M,~ 11M!,tra tn!C tilfj II\; f)i~n ct6 phl{ th~,~ ivA cMm tif-Pticq ', "'''' , q - C6 thi xac djnh nhu san: . DOi vlrl dau rang b8nh nho : . 1··; tgawi <: ~ q 1= . ~ ~ li'i + 1 j, J')! ,tg<X.t /i l .' ("'·'1' "'!\. :. ,. II 56 q2=~, , : ~ i. : j + 1 tg<X.t \ \ Trang d6 : ex t - G6c an khl1p trtn v8Bb Ian; <Xw 1 - G6c an khl1p tltn yang Ian dinh bAnh nha vA hti.nh Js . '. ,,-, . ;~'.V~.L: ~_')·~iH~~-); td-~ on; ~!n ~\-nt:t 3;"' Ko~K<J - H~.86 xet.,dtn 811 qua. W.''".• , W trqn~ d~g. Yh - H~s6 thuyd~ng; '~;fl1 "-x ' . ~~yo Yh = ( ) 0,25 , lOOOh ., " AS , ;&:v.~vaqa!JD/s) ,\ Vo - D~ nhOt da~<.9t) \ ' h T.~.'.'.;'.'' 8~.:.: ~~ <;~r ~:.;'~'.~~b6 AIl4.• t;~px6c. ,-Q - T~;~ ~Pfil1t}~~·~, ~1l,tidJ; "'> \/ Q = P/('b.dtI> 'KGfmm2 :.:.l qs - H~s6 8nh hllang chi s6m khl1p .7. Tinhcq theoAhnend~troh t oc :, ~ , tJ ;':: ._. ' L-' " ,.~IIP toi u(t~,~~,;my:y •• OOg.iDkhOp dllqc xac dIDh nhlltlch s6 c~u.p l11c vA v~ t6c tnr~, khmg dUqc 'wqt qua gia tri cho phep ./. , Y~,$;CA·[KG/~.s] Vs : V~ t6c tnrqt tItn b6 ~ (mJs] lb :ap 111ctheo Hoo' [KG/cm2] CA: V~ t6c cho~. ';d,,;',! 57 \ ' .•.• •uv• •t; I'UAI' UBY wuung uung Klem Ira OQ trnyen bfmb.rang n6n trong cau 6t6. Tit th1!cnghi~m rot ra ktt Iu~ : Sl1tr6c xna't hi~n kbi ~. Vs VU'qtqua 32000KG/cm2 . • 8. Phuong philp ALMEN-STRANBA : Phuong pllAp nay yeu can tich cua ap 11!cva v~ t6c trI1qt cDng kho8ng each tit tAm an khl1p d6n dilm X teen • dlrcmg in khOp khOng cfugcVU'qtqua gia tri cho phep : Ph'Vs~ CA [KG/cm2.s] Trong d6 X Ia khoang each tit tAm an khl1p too dilm <!angxet.1Itn duoog an khl1p, f4i d6 ngum ta dinh ~ va vs. ~ vAVs thay d6i theo dtrong in khl1p. Gia tri, eve dlJiIAlJ d4n vAcub} c1i8dOIJllin khl1p. Tich ~.Vs.X lA tieu chuln dung dl kilm tea cac 1M? truyen bBnh ring trong miy bay lam vi~c trong dieu ki~n nhi~t dQ. H~ s6 CA-s thu<mg Ia'y bang 81.000 KGm/s.Cm. T6m l~ c6 ra't nhieu de tAi c1ia nhi~u tic gi8 cho ta nhftng tien chnKn Wc nban lam co sa dl tinh toan nbAm tranh ~n nrqng hong M mJt , chu ytn IA tr6c . Ta't nhien nhftng chi tieu cung kh6ng pbai bao gia thong nMt nhau; Ke't qua tinh ron d6i kbi xa vOOktt qni thi nghi~m lItn eac thiet btthi n~ . Trong so d6 tien. chuKn so sBnh chieu dAymAng __ dau &:. tdng cac nhAP nh6 M ~t IAtien chuKn dugc sft d1}ng~ ) phuong pilip cua BLOK fAra't kh6 khiin trong vi~c tinh toan thvc tt . Nhftng ngum pIlAt triln gii thitt c1ia BLOK nhu Kelley g6p ph8n lam cho c6ng thirc BLOK dl dmg ap d\Ulg trong tinh toan th1!cre. 58 . " ,-, ~l" .• ,;,; UIJ. , ,~ KZ = __. 1- &apos ;- _ . Yz Trong d6 : " iH,/ U Krest' -eJUs6 inh huang cUB dilu. II ;; 54 J"T !J! 2.7 9 4- ;;.J.,;. 54 .rlmd .<> - so inh. JbI <, ',: ~;c1'6f~~_> 1 !4 f~ ii ;-! 1 ~ t->, ',l l, -j~{t/ iL ~ J.l - H~ s6 ma sal:;, .i ,'.' ,. A. :';' WI , J - - "." ' :.~ ,,' n'£lt'[ "~In ;:1' " J.1.Pn. (VI - v2) e = 0,83 '1 7: i ;-; ?~ :-& quot;G-~:U~ &apos ;-& apos;;i-i'f-~:;m-t,: ;o I," "';",," ,,,~AJTXJ·C~':l