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  3. 15 8 for the following applications what type of...

Question: 15 8 for the following applications what type of...

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15% .8 ) For the following applications what type of failure would be expected in service? Fill in the blanks as Creep, Fatigue, Hydrogen Embrittlement, Ductile-Brittle Transition Temp, and Overload Failure; If these dont suit or you are not sure, please fill as Not Applicable. (a) A stainless steel bolt in a furnace, which is heated up to 760°C during operation was failed after 4 years: (b) A steel bolt was broken in a cold weather (-15°C). (c) A Zn plated bolt was cracked. It was loaded below its yield strengt (d) A crack is seen at the HAZ region of a steel weldment 2 days after welding. (e) After shopping, the polyethylene plastic bag was failed on the way back to home 1096 Q.9.) If a failure does not involve any plastic deformation during fracture, it is called a type of fracture. 10% Q.10.) If the strength of the metal is increased by alloying, it is called as strengthening 16% .11.) Put the following materials in the order of increasing strength: (a) Linear polyethylene having an average molecular weight of 100,000 g/mol (b) Copper (Cu) alloyed with 12 w/o Zinc (Zn) (c) Copper (Cu) alloyed with 22 w/o Zinc (Zn), then 25% cold deformed. (d) Copper (Cu) alloyed with 22 w/o Zinc (Zn) Strength decreases in the order of 15% Q.13.) Mark the following sentences as True or False: (a) Every metal and alloy has a Ductile-Brittle transition temperature (b) Every metal and alloy has an endurance limit for fatigue (c) In polymers ductile to brittle transition temperature is not observed..... (d) Recrystallization is seen in crystalline polymers (e) The toughness of metals can be increased by decreasing the grain size. T F
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