An ordinary mild steel bar has been prestressed to a working stress of 200 MPa. If the Young's modulus of steel is 200 GPa and permanent negative strain due to shrinkage and creep is 0.0008, what is the effective stress left in the steel?
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- A certain steel has proportionality limit of 300 N/mm² in simple tension. Under a Three Dimensional Stress System, the principal stresses are 150 N/mm² (Tensile), 75 N/mm² (Tensile) and 30 N/mm² (Compressive), μ = 0.3. The factor of safety according to maximum shear stress theory would beQuestion 5 A steel component is subjected to a biaxial state of stress in which both stresses are tensile in nature, and having magnitudes 100 and 60 MPa. The plane at which the resultant stress has maximum obliquity with the normal (in degrees) isThe failure stress of a homogeneous steel bar having a diameter of 10 mm is 250 MPa. Using a factor of safety of 2.0, calculate the maximum load in N that the bar can support.
- A steel 0.6 inch×1.2 inch steel 90 m long is subjected to a 45 KN tensile load along its lenght.If poison's ratio is 0.3 Find: A. The deformation along its lenght. B. The deformation along its thickness. C. The defirmation along uts width. D. The lateral strain.A tensile load of 330,000 N is applied to a copper pipe with maximum allowable stress of 110 MPa. What should be the thickness of the pipe? 0 9.78 mm O 11.56 mm O 12.35 mm O 10.55 mmAn AISI 1040 hot-rolled steel [E = 207 GPa; α = 11.3×10–6/°C] bar is held between two rigid supports. The bar is stress free at a temperature of 30°C. The bar is then heated uniformly. If the yield strength of the steel is 429 MPa, determine the temperature at which yield first occurs.
- At what temperature in terms of ΔT will the aluminum and steel segments shown have numerically equal stresses when the load P = 200 kN?A load applied to a machine component results in the state of plane stress ?x=80 MPa, ?y=100 MPa, ?xy=60 MPa. The component is made of a brittle high-strength steel that follows the maximum normal stress criterion with ?u=200 MPa. If increasing the load increases each stress component proportionally, determine the percentage increase that can be applied before the component fails.An aluminum pipe must not stretch more than 0.05in when it issubjected to a tensile load. Knowing that E=10.1x10^6psi and that the maximum allowable normal stress is 14ksi, determine (a) the maximum allowable length of the pipe, and (b) the required area of the pipe if the tensile load is 127.5kips.
- 1. Calculate the strain at the centroid of the tension steel in single layer if the effective depth is 250 mm and the depth of neutral axis is 100 mm. answer: 0.0045 2. Calculate the strain at extreme layer of steel if fy=415 MPa and the strength reduction factor is 0.80. answer: 0.0038A steel component is subjected to alternate cyclical loading. The steel follows Basquin's law for high cycle fatigue, o, x N = C, (where the stress amplitude is in MPa). Ignore the geometric detail and assume that Marin's modifying factors are all equal to 1. You are given the minimum stress ain = -213 MPa, the maximum stress omax = 213 MPa. The material data are Tensile strength oUTS = 539 MPa, Basquin's constant c, = 875 MPa, Basquin's exponent a = 0.085. a) Calculate the stress ratio R, the stress amplitude o, in MPa and the mean stress am in MPa. The answers are acceptable with a tolerance of 0.01 for R and of 1 MPa the stresses. R: MPa MPа b) Calculate the corresponding life, in 10° cycles, (tolerance of 0.1 106 cycles) N :Please solve it fast A mild steel specimen having Young’s modulus of 200 GPa and original length of 300 mm is tested for a stress of value 500 MPa. Find the resultant elongation in the specimen.