Hindusthan College of Engineering and TechnologyAeronautical Engineering DepartmentInternal ExamIAcademic Year 20!"# Cl ass Year$ %em& I'$ 'II(atch&202"#AE20)0 *ATI+,E A-D *.ACT,.EDate $ %ession& )0$0/$20!A-Total 0ar1s& !02art A Ans3er all the 4uestions! x 2 5 0 mar1s1. What is stress concentration factor?2. Define endurance limit?3. Differentiate fatigue and fracture.4. Define S-N curve.5. What are the causes of fracture?2art ( Ans3er all the 4uestionsx 6 5 6 mar1s1. (a ! com"onent undergoes a c#clic stress of ma$imum %5& '(a and minimum 125 '(a.)he com"onent is made of steel *ith Sut + ,&& '(a and Se + 4&& '(a (S1&&& + 1&&& '(aand undergoes full# reversed stress. Determine the life of the com"onent.-.(/ Define 0o* 1#cle 2atigue and 3igh 1#cle 2atigue *ith gra"h2art C Ans3er all the 4uestions 2 x # 5 )2 mar1s1. (a Write a/out the modification factors for endurance limit-.(b)What are the effects of mean stress and e$"lain the relations *ith diagram?2. (aDerive 1offin mansion relation-.(/ Determine the diameter of a sold circular rod of ductile material having endurance strength of3,& '(a and tensile #ield strength of 52& '(a. )he rod is su/4ected to a var#ing tensile load of 35& 5N to 65& 5N. )he stress concentration factor is 1.5and assume the factor of safet# as 2.2.Name 7 SignatureStaff 8n-charge3oD9!eroPage 1 of 1