Question

Soalan 3 Question 3 Keadaan tegasan satah seperti yang ditunjukkan dalam Rajah S3 berlaku di dalam suatu komponen mesin yang diperbuat daripada keluli. Lukiskan bulatan Mohr, The state of plane stress shown in Figure 23 occurs in a machine component made of steel. Drawing Mohr's circle, (a) tentukan tegasan utama dan orientasi satah-satah utama, determine the principal stresses and the orientation of the principal planes, (5 markah/marks) (b) tegasan ricih maksimum, orientasinya dan tegasan normal yang sepadan, the maximum shear stress, its orientation and the corresponding normal stress, (5 markah/marks) (c) lukiskan satah utama dan satah tegasan ricih maksimum dan tunjukkan tegasan-tegasan yang sepadan ke atasnya. draw the principal plane and maximum shear stress plane and show the corresponding stresses on them. (5 markah/marks) 100 MPa 75 MPa 20 MPa 4/5 Rajah S3 / Figure 23

Answer 1

(oo MP4 Giren - 20 mpa 20 MPa - 100 MPa ху 75 ml scale 1cm = 2ompa 1 emax - 86 MPa. Widot arrit bo wataib out Us min Princip -25 A d max prinuple B 146 MPa Draw M S = t tug x – 2ompa Emin -86mpa - loompa NO how measure OA & DB So OA = -1.25cm & OB = 7.30m le 04 1.25x 20 =-25 mpa & OB 011 7.3 x 20 146 mpa Hence = 146 MPa & q = -25 MPa max .R= 5-02 Emax measure PK 2 PK = 43cm ie. PK = 4.3 x 20 = 86 mpa Emax = 86 mpa

Tave to 20+100 360 how find op & Oemax formula required : - OanetR 2 & 2 = Save R & 20 p = tant (Cay of Targ 1 tant 75 59.036 20-60 o OR Ozma Op, & A 149.00 - 59.036 149° 104 036 OR 104.036 & OP Op, ta 194.036° = 194.036° 2 own Drawing oy = 100 MP4 Rotated to Emax. tc-86 ox=609 T=75 MPa 5-20 mpa e=86 Oy = 60 ox ,-60.6 to max plane ( 59.04). more teonto at vor S=146 mpa gr.-25 Ty=25.MPa 5x = 146 MPa

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