Question

A semi-elliptical spring has ten leaves in al, with the two full length leaves extending 625 mm It is 62.5 mm wide and 6.25 mm thick. Design a helical spring with mean diameter of coil 100 mm which will have approximately the same induced stress and deflection for any load. The Young's modulus for the material of the semi-elliptical spring may be taken as 200 kN/mm2 and modulus of rigidity for the material of helical spring is 80 kN/mm2 17

Answer 1

&o lo ued fpseoents Hese all the thei uua mmng leaf Apring GiVem, or 2. E = 200 t = 6- 25 mm for hetcatApamg go kN/mm Attenat we have 12 PL 3m N 3 m +2 go 12 x 25 -3 g xio x 200x 62.5 x 6 2 5 3 3x2 4 210 0 O00 36923 1 = 270 8.33 N cs Scanned with CamScanner

Noar have, 8PD d3 Conardening Aparm8 the e = 6 An de x 18PL 4c & PD DIS + 2 n 4C-4 o-615 x 62.5 4x 6-4 -252 12.6 S U So. 2 165 N = 2708. 33 N = 9 Nou e diamelos =2.49 CoAsectid 12 S mm D Sa Conseckid aprang in dex 2 S CsScanned with CamScanner

Spring Comnt S D3 N - 4 . К 3 27 12 mm munt have, deaiymed Apaing the D= 10c d 12.S = 27 i2 K N= Aepend upom Сoado torll o tal The mo the end con dilkona . CS Scanned with CamScanner