Explain why the experimental values of tensile strength are

Explain why the experimental values of tensile strength are significantly smaller than their theoretical values. How was Griffith’s approach different from Inglis’ approach on this issue?

Solution

Solution :

Experimental values are smaller than theoretical values because the material may have many uncertainities when it is exposed to rela conditions like

a) There may be very minute flaws or cracks in materials which propogates when the load is applied.

b) There maybe sudden application of load which is not considered while calculating theoretical value.

c) The material will not be reliable as told by manufacturer.

Grifiiths approach is on energy based while inglish tells the stress concentrations are due to elliptical holes.