A helical compression spring with squared and ground ends is to be made of a steel wire (G= 79 Gpa, Su = 1781 Mpa), and presetting is to be used. The operation load of the spring can be considered static. If the spring wire has a diameter of 2.7 mm, and the maximum "solid" force of the spring is not to exceed 362 N, determine the minimum mean diameter of the coil that the spring can be made to. [mm] x 20.15
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- A helical spring with a load range of from 450 N to 800 N from valve-closed to valve-open conditions is used to close the valve of a spring-set relief valve having a lift of 10 mm. Assuming the spring wire to be of chrome vanadium steel, the spring is rendering average service, determine the diameter of the wire if the spring index is 7 and Sg - 420 MPa. Use G=83GPA. Select one: O a. 2.4-mm wire O b. 5-mm wire O c. 6-mm wire O d. 7-mm wirea 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 kThe specifications for a coil spring are known. Infinite fatigue life is required, using a safety factor of 1.3 applied to the maximum load only. The fatigue strength can be represented by a line between τmax= 600, τmin= 0 and τmax= τmin= 900 MPa.Assume both end plates are in contact with nearly a full turn of wireand that the end plate loads coincide with the spring axis.Determine a suitable combination of d, D, and N, if C = 8
- Design a compression helical spring to carry a load of 500 N with a deflection of 25 mm. The spring index may be taken as 8. Assume the following values for the spring material: Permissible shear stress 350 MPa Modulus of rigidity = 84 kN/mm? 4С -1 0.615 Wahl's factor 4C – 4 where C= spring index. C [Ans. d= 5.893 mm; D= 47.144 mm;n=6| %3DA helical compression spring is required for a mechanism under static loading with a maximum force of 1250N. The deflection caused by this load is 30mm the ends are squared and ground. The spring has an index of 6 and is made of cold drawn steel wire with tensile strength of 1090 N/mm and modulus of rigidity of 81370 N/mm2. The permissible shear strength is taken as 50% of the ultimate tensile strength. Design the spring and calculate: (a) The wire diameter (b) Mean coil diameter. (c) Number of active coils (d) Total number of coils (e) Free length of the spring (f) Pitch of the coilA helical compression spring is wound using 0.12-in-diameter phosphor-bronze B159 wire. The spring index C = 10 and the total number of coils is N = 14. You may assume that the spring has both ends squared and ground and is supported between fixed ends. Also, Sgy = 0.45 · Sut- a. Estimate the spring rate. b. Estimate the static load corresponding to the yield strength. c. What should the free length of the spring be to ensure that when it is compressed solid the torsional stress does not exceed the yield strength? d. Calculate the critical value of the free length of the spring to avoid buckling.
- A helical spring of oil-tempered Class I is subjected to a continuously varying load. The average load is 330 N. The factor of safety is 1.33. The spring is made of No. 7 wire and has a mean helix radius of 13 mm. Find the maximum and minimum external loads (Pmax & Pmin).(1 inch = 25.4 mm, 1 psi = 0.00689476 MPa)a helical compression spring with squared and ground ends is made of shot-peened astm a232 spring wire with presetting(G=79 GPa) . It is used to control a cyclic dynamic load that varies between 562 and 0 N. if a saftey factor of 1.12 is used, determine the allowable shear stress for a design cinsideration of infinite fatigue lifeA hard-drawn steel wire extension spring has a wire diameter of 4mm, an outside coil diameter of 28 mm, and initial tension of 1200 N is applied to the spring. The spring shows an extension of 85 mm. The approximate number of turns is 25. From the given information: Determine the physical parameters of the spring such as mean diameter, spring index, maximum shear stress, total number of turns, Wahl’s stress factor, free length of the spring, and pitch of the coil
- A helical compression spring is required to provide a minimum force of 150 lb at installation and have a working deflection of 1 in. The spring rate is 75 lb/in. The coil must fit in a 2.1-in-dia hole with 0.1 in total clearance. Use 0.25-in diameter unpeened music wire and squared/ground ends. Use a 15% clash allowance, shear modulus G = 11.5 Mpsi, and weight density γ = 0.285 lb/in3. Assume Sys = 0.6Sut. Part A Find the shear stress at the initial deflection. Express your answer in pounds per square inch to three significant figures. τiτi = Part B Find the mean stress. Express your answer in pounds per square inch to three significant figures. Part C Find the alternating stress in the coil. Express your answer in pounds per square inch to three significant figures. Part D Find the fatigue safety factor for infinite life in shear. Express your answer using three significant figures.…PROBLEM: 5 A helical valve spring is to be designed for an operating load range of 90N to 195N. The maximum deflection of the spring for this load range is 7.5 mm. Assuming a spring index of 9, a permissible shear stress of 550 N/mm2 for the material and the modulus of rigidity of 0.85x105 N/mm2. Determine the dimensions of the spring. (i.e. Diameter of the spring wire ,Mean coil diameter, Outer diameter of the spring, number of active turn and free length of the spring). Assume the spring coil is squared and ground.Determine the equivalent spring stiffness constant of the following.