2. Rigid bar ABC supports a weight of W = 50 kn. Bar ABC is pinned at A and supported at B by rod (1). What is the axial force in rod (1)?


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1 IDE 110 S08 Test 1 Name: 1. Determine the internal axial forces in segments (1), (2) and (3). (a) N 1 = kn (b) N 2 = kn (c) N 3 = kn 2. Rigid bar ABC supports a weight of W = 50 kn. Bar ABC is pinned at A and supported at B by rod (1). What is the axial force in rod (1)? N 1 = kn 3. Determine the axial force in bar AB. N AB = kn
2 4. A torque of T = 32 knm is transmitted between two flanged shafts by means of six bolts. Determine the shear force in each bolt. V bolt = kn 5. For the pin connection shown, determine the normal stress acting on the gross area, the normal stress acting on the net area, the shear stress in the pin, and the bearing stress in the steel plate at the pin. (a) σ gross = MPa (b) σ net = MPa (c) τ pin = MPa (d) σ b = MPa
3 6. A metal rod having two different diameters is loaded by an axial force P. Segments (1) and (2) are circular in cross section with diameters of 40 mm and 25 mm, respectively. If the normal stress in (1) is 65 MPa, what is the normal stress in segment (2)? σ 2 = MPa 7. The fivebolt connection must support an applied load of P = 600 kn. If the diameter of each bolt is 35 mm, determine the average shear stress in each bolt. τ = MPa 8. The threebolt connection must support an applied load of P = 600 kn. If the average shear stress in each bolt must be limited to 210 MPa, determine the minimum bolt diameter that may be used in the connection. d = mm
4 9. The steel pipe column has an outside diameter of 8 in. and wall thickness of 0.5 in. The timber beam is 11 in. wide, and the upper plate has the same width. The load imposed on the column by the timber beam is 80 kips. Determine the length L of the rectangular upper bearing plate if the average bearing stress between the steel plate and the wood beam is not to exceed 500 psi. L = in. 10. Rigid bar ABCD is supported by two vertical bars. There is no strain in the vertical bars before load P is applied. After load P is applied, the axial strain in bar (2) is 700 μm/m. Determine the axial strain in bar (1). ε 1 = μm/m 11. A thin rectangular plate is uniformly deformed as shown. Determine the shear strain γ xy at P. γ xy = με
5 12. Two gage marks are placed exactly 80 mm apart on a 18mmdiameter solid metal rod. When an axial tension force of 90 kn is applied to the rod, the distance between the gage marks in precisely measured as mm. Determine the modulus of elasticity of the metal. E = GPa 13. A 1.0in. thick rectangular alloy bar is subjected to a tensile load P by pins at A and B. The width of the bar is w = 4.0 in. Strain gages bonded to the specimen measure the following strains in the longitudinal (x) and transverse (y) directions: ε x = 2100 με and ε y = 650 με. Determine Poisson s ratio for this specimen. ν = 14. A tensiontest specimen with a diameter of in. and an 8.0in gage length was tested to fracture. Two graphs of the collected data are given on the next page. Determine the following. (a) the modulus of elasticity = Msi (b) the proportional limit = ksi (c) the ultimate strength = ksi (d) the yield strength (0.20% offset) = ksi
6 This graph is zoomed to show initial data Stress (psi) Strain (in/in) This graph shows all of the collected data Stress (psi) Strain (in/in)
7 TRIGONOMETRY sin θ = opp / hyp cos θ = adj / hyp tan θ = opp / adj STATICS Symbol Meaning Equation Units x, y, z centroid position y = Σy i A i / ΣA i in, m I moment of inertia I = Σ(I i + d i 2 A i ) in 4, m 4 J N V M J solid circular shaft polar = πd 4 /32 moment J of inertia hollow circular shaft = π(d 4 o  d 4 i )/32 normal force shear force bending moment equilibrium V = w(x) dx M = V(x) dx ΣF = 0 ΣM (any point) = 0 in 4, m 4 lb, N lb, N inlb, Nm lb, N inlb, Nm MECHANICS OF MATERIALS Topic Symbol Meaning Equation Units σ axial = N/A σ, sigma normal stress τ cutting = V/A σ bearing = F b /A b axial ε, epsilon normal strain ε axial = ΔL/L o = δ/l o ε transverse = Δd/d in/in, m/m γ, gamma shear strain γ = change in angle, γ = cθ rad E Young's modulus, modulus of elasticity σ = Eε (onedimensional only) G shear modulus, modulus of rigidity G = τ/γ = E / 2(1+ν) ν, nu Poisson's ratio ν = ε'/ε δ, delta deformation, elongation, deflection in, m δ = NL o /EA + αδtl o α, alpha coefficient of thermal expansion (CTE) in/inf, m/mc F.S. factor of safety F.S. = actual strength / design strength
8 Topic Symbol Meaning Equation Units τ, tau shear stress τ torsion = Tc/J torsion φ, phi angle of twist φ = TL/GJ rad, degrees θ, theta angle of twist per unit length, rate of twist θ = φ / L rad/in, rad/m P power P = Tω r 2 T 1 = r 1 T 2 watts = Nm/s hp=6600 inlb/s ω, r 1 ω angular speed, speed of rotation 1 = r ω 2 2 rad/s omega f frequency ω = 2πf Hz = rev/s K stress concentration factor τ max = KTc/J flexure σ, sigma σ, sigma τ, tau normal stress σ beam = My/I composite beams, n = E B /E A σ A = My / I T σ B = nmy / I T shear stress τ beam = VQ/Ib where Q = Σ(y bar i A i ) q shear flow q = V beam Q/I = nv fastener /s v or y beam deflection v = M(x) dx 2 / EI in, m Topic Equations Units stress transformation planar rotations σ u +σ y )/2 + (σ x )/2 cos(2θ) + τ xy sin(2θ) σ v +σ y )/2  (σ x )/2 cos(2θ)  τ xy sin(2θ) τ uv = (σ x )/2 sin(2θ) + τ xy cos(2θ) principals and max inplane shear tan(2θ p ) = 2τ xy / (σ x ), θ s = θ p ± 45 o σ 1,2 +σ y )/2 ± sqrt { [ (σ x )/2 ] 2 + τ xy 2 } τ max = sqrt { [ (σ x )/2 ] 2 + τ xy 2 } = (σ 1 σ 2 )/2 σ avg +σ y )/2 = (σ 1 +σ 2 )/2 strain transformation planar rotations ε u = (ε x )/2 + (ε x )/2 cos(2θ) + γ xy /2 sin(2θ) ε v = (ε x )/2  (ε x )/2 cos(2θ)  γ xy /2 sin(2θ) γ uv /2 = (ε x )/2 sin(2θ) + γ xy /2 cos(2θ) ε z = ν (ε x + ε y ) / (1ν) principals and max inplane shear tan(2θ p ) = γ xy / (ε x ), θ s = θ p ± 45 o ε 1,2 = (ε x )/2 ± sqrt { [ (ε x )/2 ] 2 + (γ xy /2) 2 } γ max /2 = sqrt { [ (ε x )/2 ] 2 + (γ xy /2) 2 } ε avg = (ε x )/2 in/in, m/m Hooke's law 1D strain to stress σ = Eε 2D strain to stress σ x = E(ε x +νε y ) / (1ν 2 ) σ y = E(ε y +νε x ) / (1ν 2 ) τ xy = Gγ xy = Eγ xy / 2(1+ν) 2D stress to strain ε x νσ y ) / E ε y = (σ y νσ x ) / E ε z = ν(ε x ) / (1ν) γ xy = τ xy /G = 2(1+ν)τ xy / E in/in, m/m pressure σ spherical = pr/2t σ cylindrical, hoop = pr/t σ cylindrical, axial = pr/2t maximum principal stress theory σ 1,2 < σ yp σ radial, outside = 0 σ radial, inside = p failure theories maximum shear stress theory τ max < 0.5 σ yp
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