A band of polyisoprene is to hold together a bundle of steel rods for up to 1 year (52 weeks). If the stress on the band is less than 10MPa at that stage, the band will not hold the rods tightly any longer. Determine the initial stress that must be applied to the polyisoprene band when it is slipped over the steel. A series of tests showed that an initial stress of 7MPa decreased to 6.8MPa after 6 weeks.

A snow load transfers the forces shown to the upper joints of a Pratt roof truss. Neglect any horizontal reactions at the supports solve for the forces in all members. Forces are positive if in tension, negative if in compression. 2.8 kN 2.8 kN 2.8 KN B HAL 2.2 m 2.2 m H 2.2 m G 2,2 m F 2.2 m 2.8 kN A D 2.8 KN E

The elastic portion of the stress-strain diagram for an aluminum alloy is shown in the figure below (Figure 1). The specimen from which it was obtained has an original diameter of 12.7 mm and a gage length of 50.5 mm. Take v=0.35 Figure σ (MPa) 490 0.007 € (mm/mm) Part A If a load of P = 40 kN is applied to the specimen, determine its new diameter. Express your answer to four significant figures and include appropriate units. d= Submit Part B L= O Value Submit μA Request Answer Determine its length. Express your answer to four significant figures and include appropriate units. Provide Feedback Value Units Request Answer ? Units ?

A steel rod has a length of 15 cm and 2 mm in diameter. The steel rod is subjected to __F 687N tensile force. If the Modulus of Elasticity of the material is 30 GN/m², determine the stress, strain and deformation in the rod?