DISSO a) Determine the decrease in its length b) Determine its new diameter.
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- The outside diameter of the coils of a safety valve spring is 120 mm while its wire diameter is 15 mm. This spring, having 10 active coils has the ends in plain ground, and has a free length of 200 mm. 1. Determine the length (in mm) at which this spring must be initially compressed to hold a pressure of 1400 kPa applied on a 32-mm diameter valve seat. Use a modulus of rigidity of 80 GPa. 2. calculate the spring’s maximum stress induced if it is compressed to its solid lengthA square thread jackscrew has a 2 threads per inch. It is to lift 15tons. The friction radius of the collar is 1 in. The coefficient offriction between the threads of the screw and base is 0.15, thatbetween the screw and the collar is 0.13. Determine:a. The diameter of the root of the screw if theallowable stress in compression is 6 000 psi.b. The torque required to turn the screw.c. The pull required at the end of a 5 ft bar raises theload.d. The twisting moment exerted at the root of thethreads.e. The power output of the screw if it is turning at 60rpm.f. The power input of the screw.g. The efficiency of the screw and collarTopic: MACHINE DESIGN A submersible cylinder used in research has a cylindrical pressure hull of outside diameter 3.0 m and a wall thickness of 150 mm. It is constructed of an aluminum alloy, having a yield point of 450 MPa. Determine the tangential stress, in terms of MPa, in the cylindrical portion of the pressure hull whenthe vehicle is at its operating depth of 5500 m below the surface of the sea. Consider sea water to have a specific weight of 104 N/m3
- a helical compression spring with squared and ground ends is ti be made of a steel wire 79 gpa and presetting is to be used. the operation load of the spring can be considered static. If the maximum working force is 292 N and a force of 35 N is required when the spring is 30 mm longer, determine the spring constant kDesign the spigot (in tension and compression) of the spigot and socket cotterjoint which is subjected to alternate tensile and compressive loading of 50 kN usingthe following data:Yield strength of cotter material SYS = 400 N/mm2, Factor of safety = 4 (for spigot)Assume thickness of cotter, t = 0.30d, where d is the diameter of the rod.A 200 GPa young's modulus of a piston rod of diameter 20 mm and length 700 mm in a hydraulic cylinder is subjected to a compressive force of 10 kN due to the internal pressure. The end conditions of rod may be assumed as guided at the piston end and hinged at the other end.Calculate the factor of safety for the piston rod.
- load of 12 kN is raised by means of a screw jack. The mean diameter of the square threaded screw is 48 mm and the pitch is 12 mm. A force of 180 N is applied at the end of a lever to raise the load. Determine the length of the lever to be used and the mechanical advantage obtained. the screw self-locking? Take µ = 0.12.The outside diameter of the coils of a safety valve spring is 120 mm while its wire diameter is 15 mm. This spring, having 10 active coils has the ends in plain ground, and has a free length of 200 mm. A.Determine the length (in mm) at which this spring must be initially compressed to hold a pressure of 1400 kPa applied on a 32-mm diameter valve seat. Use a modulus of rigidity of 80 GPa. B. Calculate the spring’s maximum stress induced if it is compressed to its solid length.The bridge construction company Z is facing problems with the mechanism of the crane, which it uses to lift the beams of the bridges. We have been informed that the bars are made of UNSG 10100 HR steel (Sy= 26x10^3psi, E= 30x10^6psi) and it is required that you determine the maximum weight that the system can support in order to identify what the problem is.
- A rod is subjed by a compressive load of 60,000 lb with shock. It is made of AISI 3140 OQT 800°F. Determine the diameter of the solid rod in inches based on the ultimate strength.2. A cylindrical vessel has an internal diameter of 2 m. It is made of 15 mm thick plate. The efficiency of the longitudinal and circumferential joints are 80 % and 60 % respectively. If the ultimate tensile stress for the material is 500 MPa and the factor of safety is 6, determine the safe internal pressure to which the vessel may be subjected.A ladder with a uniform cross-section has a length of 4.80-foot long. It weighs W Ib. It is arranged such that one end is on the ground and the other against a vertical wall. The angle of triction at all contact surtaces is 20 degrees. What is the value of the coefficient of triction? What is f, in terms of variable Na? What is the normal force at A in terms of variable W? Answer in three decimal places