What is the endurance limit for the Aluminum Alloy Does not

What is the endurance limit for the Aluminum Alloy Does not exist about 20 ksi 60 ksi None of the above Is it safe to expect an aluminum Alloy provide 100000 cycles of service under 80 ksi stress? Yes No may be Ductile to brittle transition temperature of a steel structures used in extreme cold weathers such as bridge structure in Canada is favorable to be As high as possible close to room temperatures as low as possible None of the above Materials with_____crystal structure do not show ductile-to-brittle transition temperature BCC HCP Simple cubic FCC Fracture toughness is the Critical level of stress intensity factor that is independent of the sample thickness Critical level of stress intensity factor that is dependent of the sample thickness Critical level of stress causing elastic deformation of a sample None of the above Diffusivity of Al in Cu depends on Temperature Time Both temperature and time Neither temperature nor time Diffusion will take

Solution

16. \'Does not exist\' is the answer.

17. It is safe for a tool steel alloy provide 10,0000 cycles under 80 ksi, as per the graph we can make out that at 10,0000 cycles fatigure life the maximum stress applied can be around 85 ksi.

18. The answer is As low as possible.

19. FCC is the answer.

20. Critical level of stress intensity factor that is dependant of the sample thickness.

21. Both temperature and time

22.Diffusion takes place from highly concentrated regions to lightly concentration regions.