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HW 11 - PR M-4 Use Eq(5-25 to determine the principal...

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Unformatted text preview: PR M -4 Use Eq. (5- -25) to determine the principal stresses for an arbitrary state of plane stress Gt. oy. rm, and confirm Equ' I I (5 15). l . §QLuTlgNz From equations (5-26): 1, = a, + 0'). i— + + -2-2 2- +0+0-~z'2 -o'I:I"-r1 2 — 0x0} JyJ: 020-1 fry r}: — 7:1 _ Uxay xy _ x r xv 13 =arrcr),(0)=0 From Equation (5-25): 3—[10‘2+120'-13=0 2 - (0'; + 03):)“ + [010“. — Ti]: 0 Using the quadratic equation to solve for the values of o: At a point p a material iS subjected to the state of triaxial stress I .'2 AN cI- - 240 MPa cy- — 420 MPa oz: 240 MPa. Determine the ‘ = : principal stresses and the abso!ute maximum shear stress. ‘- P_B 1 r ; A [ LUTI N: "v "I I I cs, From equations (5-26): ; / \‘ ‘ I,I 5” I, = a" + 0,, + 0': = 240mg ~120MPa + 24mm: = 360MPa j i 3C r2 = axay + dryer: + age, — r; — ri — 1;: (240MPa)(—120MPa) + (~120MP0)(240MP¢:) + (240MP0)(240MP0) -0; 1’ [3 = mayor: = (240)(-120)(240) = —6,912,000 ;‘ -_ 3 From Equation (5—25): 0'3 — 1,03 + 12a» [3 :0 I73 — 360a2 + (0)0 + 6,912,000 = 0 Using a graphing calculator to solve for the values of o: ANS g1 32 = 240MP§ g. = —120MPa Usig Equations (5-27) to find the maximum shear stress: a, — Ulzazl 4240041251; 240MPa _ 0 «73 =l240MPfl_2(_120MPa)~180MPa 02:03_ 240MPa—2(—120MPa) 180MPa— Maximum shear stress is: ANS 1% = 1§QMP§ 280 a paint p a material is subjected to a state of stress (in ksi) rI . rm 300 150 -100 n q, r“ = 150 200 100 Determine the principal 3 r3, :7: —~ 100 100 — 200 ' asses and the absolute maximum shear stress. Confirm the solute maximum shear stress by drawing the superimposed 3hr's circle as shown in Fig. 5.36. )LuTIQN: 3m equations (5-26): II = a" + 0'7“ + 0': = 300+ 200— 200: 300 12 = 0'le + oyaz + max — rj‘. - r; — r; = (300x200) + (200x400) + (—200)(300) — (150)2 — (—100)l — (100)1 = 432,500 I} = Otto-yo“: _ (7.: r5: _ arr; _ 0—: 7-3}- + 27.95712: I; = {300)(200)(—200} — (300)(—-]00)2 -(200)(--100)2 - (—2Ci0)(150)2 + 2(150)(-—100)(100) = —-15,500.000 3m Equation (5-25): a3 who} +Izcr-13 =0 a3 — ziooa2 — 82.5000 + 15,500,000 = 0 .lng a graphing calculator to solve for the values of 0': 43 g = 499 k§i g2 =14§ ksi g; = ~2§7 I<§i .ing Equations (5-27) to determine the maximum shear stress: ‘01 —az : 4091m—148kn =1305m 2 2 0‘1 «:3 =’409k§1—(-257k5i) =333k5i 2 2 CT: SJ] 3 148k31_;—257ksl) = 202’s“: a maximum shear stress is: is In, = gag k§i PBQBLEM §-z.11 .. At point p of the housing of the bearing shown in Problem 6-2.10 ‘ is subjected to the state of plane strain a. = 0.0032. 0.. = 00026. and 7,... = 00044. If 5’, = 0.0037. s, = 00031. determine the angle 0 and the strain if... at p. ' gg. “1.9". " 2 .5“. Equation (6-7): a, + 5.. a, — a}, ' a" = (cos it?) + Lin—Lain 219) ‘ 2 2 . —. . — —. . 44 . 03037:0003244 0002:0{00032 £00026)](C0526)+[00§ ){swlfi} Using a graphing calculator to solve for 0: ANS 0 = 201" Using this value for 0 in equation (6—9): 0.0044 y“. a. — 6.. 2 ’7 .. {00558.30} [0.0032 — (—0.0020] (sin 26') + {if—(cos 2€)(00526) = — (510 53.3“) +[ ._ ‘ZPonis Pan are one millimeter apart in the reference state of a material. It the material is subjected to the homogeneous y state of plane strain 5. = 0.003. a, = 0002. and y... = -0.006. what is the distance between points P and Q in the deformed material? Q9 60° f i. .f l SOLUTION: p " We use equation (6-?) with 0 = 60°: : 0', — 5.. 2 . g 0.003 — (—0.002) + [0.003 — 90002)] " 2 2 :3. = - 0.00335 + (cos 29) + film 20) — 0.006 («151200) +l (sin 120°) \ The deformed distance from P to Q is: (POT = a" (PO) + (P0) = (P0) (1 + 5', ) = (1 mm) (-0.00335 + t) ANS [PQI' = Ofigfifi mm 312 ...
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