Question

1 a)

Which polymers in the following figure does NOT show a clear endurance limit (select the best answer)? 25 PS PET 3 20 15 PMMA 2 Stress amplitude (MPa) Stress amplitude (ksi) 10 PP. Nylon (dry) 1 PE 5 PTFE 103 104 105 106 107 Number of cycles to failure PS PMMA PP PET O PE

b)

Answer 1

Solution

Part a

polyethylene terephthalate (PET)) doesn't show clear Endurance limit or fatigue limit. Endurance limit is used for nonferrous materials. These don't show a clear fatigue limit.

part b

Steel have high fracture toughness

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