Calculate the strain if initial length of rod is 104 mm and extension in rod due to tesnile load is 1.2 mm
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- A tensile test was performed on a metal specimen having a circular cross section with a diameter 0. 510 inch. For each increment of load applied, the strain was directly determined by means of a strain gage attached to the specimen. The results are, shown in Table: 1.5.1. a. Prepare a table of stress and strain. b. Plot these data to obtain a stress-strain curve. Do not connect the data points; draw a best-fit straight line through them. c. Determine the modulus of elasticity as the slope of the best-fit line.The bowstring has an unstretched length of 850 mm and cross-sectional area of 400 mm^2. It is recorded that the stress on the upper segment of the bowstring is 50 MPa. See figure.Determine the (a) average normal strain in the string, (b) the applied pull of the archer on the arrow, and (c) the tension acting on the lower segment of the string.The beam is loaded by two point forces P. The beam is assembled according to the cross-sectional view by nailing wooden parts with cross-sections of 50 mm x c = 220 mm and 25 mm x d = 260 mm. How large can the value of the load P be when the distance between the nails in the longitudinal direction of the beam is 100 mm, the cross-sectional area of the nail is 9 mm2 and their permissible shear stress is 110MPa? Then calculate the maximum stresses and shear stresses of the beam at that load when the distance between the articulated supports is L = 1.9 m and the length of the beam projections a = 1.3 m. Permissible shear force of one nail? kN Static torque of the cutting surface? mm^3 Maximum torque change in cantilever? kNm Cutting force of the projection? kN Magnitude of force P? kN Calculated with the obtained force P maximum normal stress? MPa shear stress maximum? MPa
- Solve Sample Problem No. 1 using these load values: a. M D =175 kN-m,M L =1 90 kN-m b. Find the maximum design moment so that its tension controlled. (USE c = 3d / 8). Tension steel exactly experiences 0.005 strain.Determine the average normal stress in each rod if T2=400∘F Calculate the new length of the aluminum segment.5. Find the maximum allowable value of P for the column. The cross-sectional areas and working stresses (??) are shown in Figure 3. 6. The wood pole shown in the Figure 4 is supported by two cables of ¼ inch diameter. The turnbuckles in the cable are tightened until the stress in the cables reaches 60,000 psi. if the working compressive stress for wood is 200 psi, determine the smallest permissible diameter of the pole.
- The compound bar containing steel, bronze, and aluminum segments carries the axial loads shown in the figure. The properties of the segments and the working stresses are listed in the table. Determine the maximum allowable value of P if the change in length of the entire bar is limited to 0.08 in. and the working stresses are not to be exceeded.A steel rod with a cross sectional area of 120〖mm〗^2 is stretched between two fixed points. The tensile load at 20°C is 4200N. What will be the stress at-25°C? α=11.7x〖10〗^(-6)/°C and E = 200GPa. See figure 06Find the EIδ under 200lb load EIδδ under 400lb load
- What maximum load P can be applied without exceeding an allowable stress of 70 MPa for aluminum or 120 MPa for steel? Can a larger load P be carried if the length of the aluminum rod is changed. the length of the steel portion being kept the same? If so, determine this lengthcalculate the strength reduction factor at the minimum strain of extreme tension steel f'c=28 mpa and fy=420 mpaStrength of materials - ENGR 3321 The answer should be: 17.68 kN; 11.8 MN/m2 compressive