mechanical engg
A helical-coil compression spring is to be designed to exert a static force of 100 lb when the spring is compressed 2.0 inches. The spring must fit inside a cylindrical hole. The following information is given for your calculation. Spring index, C Clearance between the spring and the hole Diameter of the hole, dhole Fractional overrun to closure, ? 10 0.25 inch 2.25 inches 0.15 The spring is made of music wire A228 with m = 0.145 and A =201 kpsi•??$. Assume maximum allowable torsional shear strength for the spring is 45% of ultimate tensile strength (Ssy = 0.45Sut). (a) Determine the spring rate, k of this spring (5 points) (b) Determine the coil diameter D and the wire diameter d of the spring (5 points) (c) Determine the maximum shear stress of the spring (10 points) (d) Determine the yielding safety factor, ns at the solid height (5 points
Homework Answers
2. A helical compression spring is made from No. 8 steel wire and is to carry a 100 lb static load at a deflection of 1 inch. The outside coil diameter of the spring is 0.972 inches. The spring ends...
2. A helical compression spring is made from No. 8 steel wire and is to carry a 100 lb static load at a deflection of 1 inch. The outside coil diameter of the spring is 0.972 inches. The spring ends are squared. Assume the torsional yield strength of the wire is 80000 psi, and the shear modulus is 11.4 Mpsi, determine (a) The static load corresponding to the yield strength. (b) The deflection that would be caused by the load...
[10] The free length of a helical spring with closed ends is 4 inches and its...
[10] The free length of a helical spring with closed ends is 4 inches and its spring constant is 50 lbs/in. The spring has a total of 10 coils and a wire diameter of 0.125 inch. If the maximum working force is 100 lbs, the fractional overrun to closure is closest to: a. 0.15 b. 0.23 c. 0.31 d. 0.42 e. None of these
1) [60 pts] Helical Compression Spring A helical compression spring is wound using music wire of...
1) [60 pts] Helical Compression Spring A helical compression spring is wound using music wire of diameter, d, 2.64 mm. The spring has an outside diameter, OD, of 33 mm with plain ground ends and 14 coils. a) Estimate the spring rate. The spring rate is N/mm. b) What is the force needed to compress this spring to closure assuming that the spring will reach its shear strength at its solid length? The force needed to compress this spring to...
2, A helical compression spring is to be designed to carry a variable load. The load...
2, A helical compression spring is to be designed to carry a variable load. The load varies from a minimum of F,=4 lbf to a maximum of F, = /8 lbf. The corresponding spring length varies from a maximum of L, 2.5 in to a minimum of L, =1 in. The outside diameter of the spring is Do = 0.638 in; the material is hard-drawn wiree of diameter d = 0.080 in. The free length of the spring is L...
Mechanical springs
It is required to design a valve spring of IC Engine with following details:Spring load = 80 N, When valve is closedSpring load = 100 N, When valve is openSpace constraints for spring fitment are :Inside guide bush diameter = 24 mmOutside recess diameter = 36 mmValve lift = 5mmSpring steel has following properties :Ultimate tensile strength = 700 N/mm2Modulus of rigidity = 8.4 × 10^4 N/mm2Spring ends are square and ground. Permissible shear stress for spring wire = 0.5 Sut. Determine:...
1. A helical compression spring has the following characteristics Wire diameter Outside diameter ...
Please answer if you are sure, thank you
1. A helical compression spring has the following characteristics Wire diameter Outside diameter Fmi 15.5 mm 15 N 100 N 115 N 25 mm maz End Treatment squared and ground Modulus of Rigidity80e9 N/m2 Note: Δ is the difference in deflection under the loads Fmin and Frnaz. Be sure to sketch the spring in its various states to assist in answering the following questions. (a) Find the spring constant, k. Be sure...
solve P11 and P12 based on Part 3 Mechanical Springs A helcal compression spring is made...
solve P11 and P12 based on
Part 3 Mechanical Springs A helcal compression spring is made from music wire that is 0 041 inches in diameter and has a mean coil diameter of 0.50 inches with a free length of 2.0 inches and 10 total coils with plain ends Problem 9 What is the solid length L A) 0.32 inch 8)0.25 inch 041 inch D) 0.45 inch E) 0.53 inch Problem 10 What is the spring rate k? A) 5.50...
1. An existing helical-coil compression spring is wound from unpeened music wire with a diameter of...
1. An existing helical-coil compression spring is wound from unpeened music wire with a diameter of d= 0.105". The mean diameter of the spring is D- 0.80" as shown. The applied load fluctuates between 0 and 25lb. A design life of 10 cycles is desired. We also know that 0.577Su for this music wire. Determine the existing factor of safety for this spring n2.0 (Hint: check both fatigue and yielding) D = 0.80 in
A compression spring is needed to fit within a 1-in diameter hole. To allow for some clearance, the outside diameter of the spring is to be no larger than 0.9 in. To ensure a reasonable coil, use a s...
A compression spring is needed to fit within a 1-in diameter hole. To allow for some clearance, the outside diameter of the spring is to be no larger than 0.9 in. To ensure a reasonable coil, use a spring index of 8. The spring is to be used in a machine by compressing it from a free length of 2 in to a solid length of 0.6667 in. The spring should have squared ends, and should be unpeened, and is...
1- A helical compression spring is to be made of oil-tempered wire of 4-mm diameter with...
1- A helical compression spring is to be made of oil-tempered wire of 4-mm diameter with a spring index of C = 10. The spring is to operate inside a hole, so buckling is not a problem and the ends can be left plain. The free length of the spring should be 80 mm. A force of 50 N should deflect the spring 15 mm. (a) Determine the spring rate. (b) Determine the minimum hole diameter for the spring to...
2. A helical compression spring is made from No. 8 steel wire and is to carry a 100 lb static load at a deflection of 1 inch. The outside coil diameter of the spring is 0.972 inches. The spring ends are squared. Assume the torsional yield strength of the wire is 80000 psi, and the shear modulus is 11.4 Mpsi, determine (a) The static load corresponding to the yield strength. (b) The deflection that would be caused by the load...
[10] The free length of a helical spring with closed ends is 4 inches and its spring constant is 50 lbs/in. The spring has a total of 10 coils and a wire diameter of 0.125 inch. If the maximum working force is 100 lbs, the fractional overrun to closure is closest to: a. 0.15 b. 0.23 c. 0.31 d. 0.42 e. None of these
1) [60 pts] Helical Compression Spring A helical compression spring is wound using music wire of diameter, d, 2.64 mm. The spring has an outside diameter, OD, of 33 mm with plain ground ends and 14 coils. a) Estimate the spring rate. The spring rate is N/mm. b) What is the force needed to compress this spring to closure assuming that the spring will reach its shear strength at its solid length? The force needed to compress this spring to...
2, A helical compression spring is to be designed to carry a variable load. The load varies from a minimum of F,=4 lbf to a maximum of F, = /8 lbf. The corresponding spring length varies from a maximum of L, 2.5 in to a minimum of L, =1 in. The outside diameter of the spring is Do = 0.638 in; the material is hard-drawn wiree of diameter d = 0.080 in. The free length of the spring is L...
Please answer if you are sure, thank you
1. A helical compression spring has the following characteristics Wire diameter Outside diameter Fmi 15.5 mm 15 N 100 N 115 N 25 mm maz End Treatment squared and ground Modulus of Rigidity80e9 N/m2 Note: Δ is the difference in deflection under the loads Fmin and Frnaz. Be sure to sketch the spring in its various states to assist in answering the following questions. (a) Find the spring constant, k. Be sure...
solve P11 and P12 based on
Part 3 Mechanical Springs A helcal compression spring is made from music wire that is 0 041 inches in diameter and has a mean coil diameter of 0.50 inches with a free length of 2.0 inches and 10 total coils with plain ends Problem 9 What is the solid length L A) 0.32 inch 8)0.25 inch 041 inch D) 0.45 inch E) 0.53 inch Problem 10 What is the spring rate k? A) 5.50...
1. An existing helical-coil compression spring is wound from unpeened music wire with a diameter of d= 0.105". The mean diameter of the spring is D- 0.80" as shown. The applied load fluctuates between 0 and 25lb. A design life of 10 cycles is desired. We also know that 0.577Su for this music wire. Determine the existing factor of safety for this spring n2.0 (Hint: check both fatigue and yielding) D = 0.80 in
A compression spring is needed to fit within a 1-in diameter hole. To allow for some clearance, the outside diameter of the spring is to be no larger than 0.9 in. To ensure a reasonable coil, use a spring index of 8. The spring is to be used in a machine by compressing it from a free length of 2 in to a solid length of 0.6667 in. The spring should have squared ends, and should be unpeened, and is...
1- A helical compression spring is to be made of oil-tempered wire of 4-mm diameter with a spring index of C = 10. The spring is to operate inside a hole, so buckling is not a problem and the ends can be left plain. The free length of the spring should be 80 mm. A force of 50 N should deflect the spring 15 mm. (a) Determine the spring rate. (b) Determine the minimum hole diameter for the spring to...
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