Curved Beam - VTU e-Learning

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σro N/mm 2 =-48.433 σ bo=-54.606 N/mm 2 σ d b = 30 mm c =50mm 2 NA, CA h =90 mm c =40mm 1 b σ ri= 49.858 N/mm 2 σ bi= 43.685 N/mm 2 σ d= 6.173 N/mm 2 b /2 = 15 o b /2 = 15 o 60 mm
Problem no.11 The section of a crane hook is rectangular in shape whose width is 30mm and depth is 60mm. The centre of curvature of the section is at distance of 125mm from the inside section and the load line is 100mm from the same point. Find the capacity of hook if the allowable stress in tension is 75N/mm 2 Solution: Draw the critical section as shown in the figure. Inner radius of curved beam ri = 125mm Outer radius of curved beam ro = 125+60 = 185mm Radius of centroidal axis rc =100+ = 130mm Radius of neutral axis rn = ln = 153.045mm h=60mm b=30mm = ln 125 mm Distance of neutral axis to centroidal axis e = rc - rn b = 30 mm 100 F = ? c 2 c o h = 60mm e CA NA = 155-153.045 = 1.955mm r o c 1 c i l rn rc Load line 100 r = 125mm i F C L
Page 1 and 2: CURVED BEAMS CONTENT: WHAT’S A C
Page 3 and 4: G1H1 = (R+Y) Ѳ Also Stress OR dF =
Page 5 and 6: Stresses in Curved Beam Consider a
Page 7 and 8: We know, stress σ = E.e We know, s
Page 9 and 10: ∴ M = b θ A.e ..... (iii) θ Fro
Page 11 and 12: 2 3 Neutral axis and centroidal axi
Page 14 and 15: Why stress concentration occur at i
Page 16 and 17: For a straight beam: Inner most fib
Page 18: e = rc - rn = 100 - 91.024 = 8.976m
Page 21 and 22: = i.e., 4674.069+83.61t +83.61t = 4
Page 23 and 24: σri = σd + σbi = 7.0736 105.00
Page 25 and 26: Bending stress at the outer fiber
Page 27 and 28: =150.34mm To find the centroidal ax
Page 29 and 30: Distance of neutral axis to inner r
Page 31 and 32: Problem no.7 Determine the maximum
Page 33 and 34: Maximum shear stress max = 0.5x σm
Page 35 and 36: ∴ Radius of centroidal axis rc =
Page 37 and 38: Combined stress =-198.189 N/mm σ r
Page 39 and 40: x = = 101.785mm Radius of
Page 41 and 42: Problem no.10 Compute the combined
Page 43 and 44: Bending stress at the inner fiber
Page 45: C2 = = 50mm c1 = 90-50= 40mm Mome
Page 49 and 50: Problem no.12 Design of steel crane
Page 51 and 52: Applied force F = 10 5 N Area of cr
Page 53 and 54: Problem no.13 The figure shows a lo
Page 55 and 56: Draw the critical section at PP-Q a
Page 57 and 58: 25 ro = 75 + 2 = 87.5 mm A = π 4 d
Page 59 and 60: The ring is symmetrical and is load
Page 61 and 62: As this quantity is positive the di
Page 63 and 64: The stress at inner (σ1Ai) ) and o
Page 65 and 66: As per Castigliano’s theorem \
Page 67 and 68: The stress at any angle Ѳ can be f
Page 69 and 70: Distance of neutral axis to outer r
Page 71 and 72: Problem 16 Determine the stress ind
Page 73 and 74: Consider the cross section B - B At
Page 75 and 76: Distance of neutral axis to outer r
Page 77 and 78: Using usual notations prove that th
Page 79 and 80: Substituting the value of the σx f
Page 81 and 82: 1 ∆ = 1 {From equation (x
Page 83 and 84: VTU,Jan/Feb.2005 Fig.1.35 5. Determ
Page 85: REFERENCE BOOKS • “MECHANICAL E

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