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3. A thin strip of rubber has an initial length of 25 in. If it is stretched around a pipe having an outer diameter of 7 in., determine the average normal strain in the strip.

The strain at point A on the bracket has normal components 400x10-6 and 550x106 in x and y directions, respectively and shear component -650 x10-6 in x-y plane. Determine the absolute maximum shear strain in 10-6 unit. A

After load P is applied to the pin-connected structure, a normal strain of = +650 µe is measured in the longitudinal direction of member (1). The cross-sectional area of member (1) is A₁ = 0.6 in.2, its elastic modulus is E₁ = 31000 ksi, and its yield strength is 33 ksi. Assume a=6.25 ft, b=7.75 ft, c=4.5 ft, and d=3.75 ft. (a) Determine the axial force in member (1), the applied load P, and the resultant force at pin B. (b) The ultimate shear strength of the steel pins is 52 ksi. Determine the minimum diameter for the pin at B if a factor of safety of 2.2 with respect to the ultimate shear strength is required. (c) Compute the factor of safety for member (1) with respect to its yield strength. (1) a D Answer: 0₁ = 1.6377 B (a) Determine the axial stress o, in member (1). ksi. b