1. A safety valve must start opening when the force is equal to 777.48N, and be fully openwhen (20mm spring compression) at a force of 812.82N. The spring should not be more than90mm outside diameter, with the maximum shear stress under 1100MPA. The material usedhas a shear modulus of (G = 77.2 GPa). Determine the springs Mean Diameter, Wirediameter, Number of active coils and unloaded Length.DC =d4С — 10.6158FDKwT = K,-nd³+4С — 4C-8FD³Ny =8FD³NdªG1+2C²dªG

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Answered: A safety valve must start opening when…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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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 k
(i) Calculate the force applied on the spring.
Please solve this question.
Calculate the safety of the cylinder pivot pin in relation to the yield. The tensile yield strength of the pin material is ReL=600MPa. The dimensions of the structure are: x1 = 10 mm x2 = 120 mm y1 = 110 mmy2 = 798 mm Piston rod = φ32mm Cylinder pivot pin = φ25mm Pliers pivot pin = φ30mm The clamping force of the pliers is 6000N Answer to one decimal place !!
Mechanical Properties W/ complete solution
An automobile engine has a valve spring is to be made of Fe, C, & Mn, to be oil-tempered, & to be designed that should not exceed to a cylindrical space of 134-in in diameter. The spring index should be 6.0, the coil-to-coil distance of 0.33in, & the maximum load it will sustain is 100lb with the corresponding compression of ½/2-in. The spring is subjected to repeated loading & fatigue must be considered by a factor of safety of 2.25. Determine: (a) the diameter of wire based on commercial sizes; (b) the total number of coils; (c) the free length of the spring. Sample image of valve spring in an assembly.
2. A helical valve spring is to be designed for an operating load range of approximately 90 to 135 N. The deflection of the spring for the load range is 7.5 mm. Assume a spring index of 10. Permissible shear stress for the material of the spring = 480 MPa and its modulus of rigidity 80 kN/mm2. Design the spring. 4С - 1 0.615 , C being the spring index. Take Wahl's factor %3D 4С - 4 [Ans. d = 2.74 mm ; D = 27.4 mm ; n = 6]
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A compression spring is made of music wire of 2 mm diameter having a shear strength and shear modulus of 800 MPa and 80 GPa respectively. The mean coil diameter is 20 mm, free length is 40 mm and the number of active coils is 10. If the mean coil diameter is reduced to 10 mm, the stiffness of the spring is approximately (a) Decreased by 8 times (c) Increased by 2 times (b) Decreased by 2 times (d) Increased by 8 times
Two plates of which (2.5 d) and d as outer and inner diameter respectively and thickness 25 mm each are held together by means of a bolt. The bolt material S-400 N/mm² and E210000 N/mm² while plate material E= 72000 N/mm². The initial preload in the bold is 6.0 KN and force on the joint is 12 kN. Find out size of bolt assuming factor of safety 2.0.
A semi-elliptic multi-leaf spring is used for the suspension of the rear axle of a truck. It consists of two extra full-length leaves and ten graduated-length leaves including the master leaf. The centre-to-centre distance between the spring eyes is 1.2 m. The leaves are made of steel 55S12M090 (S N/mm) and the factor of safety is 2.5. The spring is to be designed for a maximum force of 30 KN. The leaves are pre-stressed so as to equalize stressds in all leaves. Determine (i) the cross-section of leaves; and (ii) the deflection at the end of the spring. = 1500 N/mm and E = 207 000 %3D
The ratio of stress to bulk modulus for compression of the material. Select the correct response. Dilatation Modular ratio Bulk's ratio Deformation < Previous

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