Cyclic stresses a fatigue test was conducted in which the mean stress was 46.2 mpa and the stress amplitude was 219 mpa. (a) calculate the maximum stress level (in mpa). (b) calculate the minimum stress level (in mpa). (c) calculate the stress ratio. (d) calculate the magnitude of the stress range (in mpa). (a) mpa (b) mpa (c) (d) mpa

a) 265.2 MPa

b)-172.8 MPa

c) -0.6541

d) 438 MPa

Explanation:

we know that

..............(1)

.................(2)

solving equ (1) and equ (2) we get

= 265.2 MPa

= -172.8 MPa

stress ratio =

= = -0.6515

now stress range = -

= 265.2 -(-172.8) = 438 MPa

the moon affects the earth gravitation ally, causing certain motions of that body and also producing tides in its ocean and atmosphere. the tidal wave in our atmosphere is, however, far too minute to be an effective cause in any known meteorological phenomenon.

explanation:

change tension