Answer :
Answer:[tex]\sigma _{max}=280 MPa[/tex]
[tex]\sigma _{min}=-140 MPa[/tex]
Step-by-step explanation:
Given
[tex]\sigma _{mean}=70 MPa=\frac{\sigma _{max}+\sigma _{min}}{2}[/tex]
[tex]2\times 70=\sigma _{max}+\sigma _{min}[/tex]-------1
[tex]\sigma _a=210=\frac{\sigma _{max}-\sigma _{min}}{2}[/tex]
[tex]210\times 2=\sigma _{max}+\sigma _{min}[/tex]-------2
From equation 1 & 2 we get
[tex]\sigma _{max}=280 MPa[/tex]
[tex]\sigma _{min}=-140 MPa[/tex]
(b)Stress ratio(R)=[tex]\frac{\sigma _{min}}{\sigma _{max}}[/tex]
R=[tex]\frac{-140}{280}=-0.5[/tex]
(c)Range=[tex]\sigma _{max}-\sigma _{min}[/tex]
Range=280-(-140)=560 MPa
Answer:
Step-by-step explanation:
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