Please help with all thank you!! An exhaust valve spring assembly with a helical compressionspring, is to be cycled between 250lbf when valve is closed, and400lbf when valve is opened from free length of 2.0 in to solidlength of 1.5 in. The index for the spring is 10. The coil is tofit a 3.2-in hole with a 0.2-in clearance around the spring. Thespring material is oil-tempered wire, squared and ground, andunpeened. Use the curvature effect factor KB. Take G=11.6 Mpsi,and Ssy = 0.5Sut(a) Determine a suitable wire diameter.(b) Determine a suitable total number of coils coils rounded tothe nearest whole number.(c) Determine the spring constant.(d) Determine the static factor of safety when compressed tosolid length.(e) Determine the fatigue factor of safety when repeatedlycycled from free length to solid length. Use the Zimmerli-Goodmancriterion.

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(a) Determine a suitable wire diameter. (b) Determine a suitable total number of coils coils rounded to the nearest whole number. (c) Determine the spring constant. (d) Determine the static factor of safety when compressed to olid length. (e) Determine the fatigue factor of safety when repeatedly ycled from free length to solid length. Use the Zimmerli-Goodman riterion.

(a) Determine a suitable wire diameter. (b) Determine a suitable total number of coils coils rounded to the nearest whole number. (c) Determine the spring constant. (d) Determine the static factor of safety when compressed to olid length. (e) Determine the fatigue factor of safety when repeatedly ycled from free length to solid length. Use the Zimmerli-Goodman riterion.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Q(1) :A helical compression spring is to be cycled between 150 lbf and 300 lbf with a 1-in stroke.The number of cycles is low, so fatigue is not an issue. The coil must fit in a 2.1-in diameter hole with a 0.1-in clearance all the way around the spring. Use unpeened oil tempered wire with squared and ground ends. (CLO1) (i) Determine a suitable wire diameter, using a spring index of C=7.(ii) Determine a suitable mean coil diameter.(iii) Determine the necessary spring constant.(iv) Determine a suitable total number of coils.(v) Determine the necessary free length so that if the spring were compressed to its solid length, there would be no yielding.
! Required information A helical coil compression spring is needed for food service machinery. The load varies from a minimum of Fmin 4 lbf to a maximum of Fmax 16 lbf. The spring rate k is to be 9.5 lbf/in. The outside diameter of the spring cannot exceed 2.5 in. The spring maker has available suitable dies for drawing 0.08-in-diameter wire. Use a fatigue design factor nfof 1.5 and the Gerber-Zimmerli fatigue-failure criterion. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Determine the values for each of the following for a value of 0.08 in: The torsional modulus of rupture, Ssu, is 163.7 kpsi. Torsional yield strength, Ssy, is 85.5 kpsi. The endurance strength, assuming unpeened spring wire, Sse, is The value of the mean diameter, D, is 0.662 ✔ in. shear stress, Ta, is The fatigue factor of safety, nf, is The free length, Lo, is The critical length, LO(cr), is The alter 1.32 x in. in. kpsi. 39.5 kpsi.
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