if the value of spring index is 9 and the mean diameter of the spring is 24 mm, the spring wire diameter d is * . mm O a. 33.00 O b. 216.00 O c. 1.33 O d. 2.67
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- (5) A gas engine valve spring is loaded to 35kgf when the valve is closed & 52kgf hen the valve is open. The valve lift is 8mm. The outside diameter is to be from 38mm~45mm, & the permissible stress is 413N/mm2 . Determine: (a) the wire & outside diameter; (b) the number of effective coils; (c) the free length when it is squared & ground.Three springs A, B, and C has spring constants 641 N/mm, 495 N/mm, 541 N/mm respectively. Determine the equivalent spring constant if the springs are in PARALLEL.A helical compression spring is to be used for a maximum load of 1.5 kN using the spring index of 8. The maximum permissible shear stress for the spring wire is 400 MPa. Which of the following is the wire diameter of the spring to be used?
- Determine the minimum force required to deflect the spring with spring constant of 251 N/mm to a displacement of 5 mm.Three springs A, B, and C has spring constants 213 N/mm, 143 N/mm, 341 N/mm respectively. Determine the equivalent spring constant if the springs are in SERIESTwo steel springs arranged in series support a load P. The upper spring has 12 turns of 25 mm diameter wire on a mean radius of 100 mm. The lower spring consists of 10 turns of 20 mm diameter wire on a mean radius of 75 mm. Use G = 83 GPa. Which of the following most nearly gives the value of the total elongation of the assembly? Which of the following most nearly gives the equivalent spring constant of the assembly? Which of the following most nearly gives the maximum value of P if the allowable shearing stress is 200 MPa?
- 1. Explain the difference between modulus of elasticity and modulus of rigidity. 2. What are rigid flange couplings used for? 3.What are the main uses of springs? 4.Explain what is meant by the term ‘spring rate’. 5.What is equivalent spring stiffness?Determine the possible range for R is the equivalent spring stiffness constant varies from 50 N/m to 500 N/mA semi-elliptic spring used for automobile suspension, consists of twoextra full-length leaves and eight graduated-length leaves, including themaster leaf. The centre-to-centre distance between the two eyes is 1 m.The leaves are made of steel 55Si2Mo90 (S = 1500 N/mm yt2 andE = 207 000 N/mm2) and the factor of safety is 2. The maximum springload is 30 kN. The leaves are pre-stressed so as to equalize stresses in allleaves under maximum load. Determine the dimensions of thecross-section of the leaves and the deflection at the end of the spring.
- Question 4A close-coiled helical spring is to have a stiffness of 90 kN/m and is to exert a maximum force of 3.7 kN. If the mean diameter of the coils is 80 mm, and the maximum stress is not to exceed 300 MPa, calculate the required number of coils and the diameter of the steel rod from which the spring should be made (G=80 GPa).A typical compound helical spring consists of two coaxial closed coil spring having the following particulars: Outer spring 1: Mean coil diameter = 100mm Wire diameter = 12.5 mm No. of turns = 15 Inner spring 2: Mean coil diameter = 75 mm No. of turns = 20 Both the springs are of equal initial length when unloaded. If the working stress for each spring is to be the same. The modulus of rigidity for the wire material is 80 GPa. Calculate the following: a. Diameter of steel wire for inner spring b. Stiffness of inner spring c. Stiffness of the compound springA spring has an unstretched length of 600 mm. If it was stretched by 400 mm, the work done is 800 Joules. What is the stiffness of the spring? A) 100 N/m B) 10 KN/m C) 1000 N/m D) 1 KN/m