Failure Analysis Case Studies II Episode 1 pot

FAIZURE ANAZYSIS CASE SZZLDIESII Edited by D.R.H. Jones Pergamon [...]... history 3 6 x12" '11 94 UB PANEL BOLTS L FRAMES 318 - WHITWORTH FRAME BOLTS 2 "12 x1/4" SITE WELD TO 3 / 6 THK DECK PLATE 3 / 0 3DF2 COMPOSITE SHEETING 4 " r 2 5 " L CLEAT WITH BOLTED HOLE FOR 3/ WHITWORTH BOLTS DETAIL 1 DETAIL 2 DETAIL 3 I SCALE 11 0 1 I SCALE 1. 10 1 I SCALE PANELLING ELEVATION VIEWING FROM SOUTH I SCALE 11 5 I Fig 1 B!C firewall: elevation and details 1. 10 SECTION A-A 1 - -230 -10 0 I 300... polished cross-section after etching in 2% nital The case- 15 Fig 8 Polished cross-section through the shaft, showing the case- hardened layer Table 2 Hardness measurements on shaft cross-section as a function of radial distance from the centre r (mm) HV 0 10 17 .5 22.5 Case 350 360 375 400 880 (MW ~ T S 11 20 11 52 12 00 12 80 2 816 k, (MPa) 700 720 750 800 17 60 measured hardness at the centre is HV 350, which... gland C Tao, N Xi, H Yan and Y Zhang Analysis of a vehicle wheel shaft failure J Vogwell Fatigue failure analysis of a leg press exercise machine P.J.Vernon and T.J Mackin Failure analysis of rubber fuel pipes in aero-engines G Fu 17 5 18 5 19 3 19 9 211 225 235 2 41 247 255 267 Environmental attack Failure of austenitic stainless steel components... joint 11 to joint 1) to joint Yield strength (N ~II- ~) 288 2 61 300 278 Tensile strength (N ~II- ~) 3 41 316 345 313 Reduction of area (”/) Elongation (5 diameters) 18 44.5 I1 IS 47.5 43 46.3 70 (”/I Uniform elongation (”/) 25 24 24 29 7 30 - 20- f fi.2 I I I I I 5 10 15 20 25 Fig 7 Behaviour of bolted joints in tension tests A [mml I Specimens B 1, B.2, C 1 and C.2 were tested for the strength of the bolted... fracture of the case can be found from the standard expression [ 41 r =2zk,(r:3 - r:) ' (8) where Y, (= 25 mm) is the outer radius of the case, and rz (= 23.5 mm) is the inner radius of the case Since k , x 17 60MPa for the case, the failure torque is 0.98 x lo7N mm The total torque is therefore (2.06+0.98)= 3.04 x 10 7Nmm It is interesting to notice that, even though the case is only 1. 5mm thick, it... centre of the shaft in Fig 11 As Fig 1 1 shows, the ultimate shear stress can be described by the empirical expression k, (MPa) = 700+8.78 x 10 -3(r/mm)3 (6) over the core of the shaft (the region from the centre of the shaft to the inner edge of the case) The torque required to cause shear fracture of the core is then given by r = 27c 23.5mm 0 (700+8.78x 10 -3r')r2drNmm=2.06x 10 7Nmm (7) The torque required... rolling-element bearings P.J.L Fernandes 409 An air crash due to fatigue failure of a ball bearing I Salam, A Tauqir, A U1 Haq and A.Q Khan 415 Failure analysis of a condensate pump shaft A.M Lancha, M Serrano and D Gdmez Briceiio 425 Author Index 443 4 Fig 1 Damaged silos: view of the site k l i - I , , / , i , ( , , , , Fig 2 Bolted joints of... end The maximum pressure reached at P1 was 19 .5kN/m2 (0 .19 5 bar) The maximum pressures at other points within module C were higher The CFD calculation assumed that the wall broke up when the instantaneous pressure reached 10 kN/m2 In the subsequent dynamic analysis the pressure history is idealised as an asymmetric triangular pulse with peak 19 .5kN/m2, rise time 81 ms and fall time 46ms Figure 2 compares... D.G Jeong 277 285 3 01 307 3 13 317 33 1 Environmentally assisted cracking Sustained load crack growth leading to failure in aluminium gas cylinders in traffic J.W.H Price, R.N Ibrahim and D Ischenko Hydrogen-assisted stress-corrosion of prestressing wires in a motonvay viaduct L Vehovar, V.Kuhar and A Vehovar 345 357 ix Failure analysis of camer chain pins G.A Slabbert,... Vlll Fatigue Catastrophicfailure of a raise boring machine during underground reaming operations A James Fatigue failure of the de Havilland Comet I P.A Withey Low-cycle fatigue of titanium 6A1-4V surgical tools H Velasquez, M Smith, J Foyos, F Fisher O.S Es-Said and G Sines Failure analysis and experimental stress analysis of a threaded rotating shaft . CASE SZZLDIESII Edited by D.R.H. Jones Pergamon