Why is the second option the best answer? Explain in great detail. The graph sho

Question

Why is the second option the best answer? Explain in great detail.

The graph shows a stress-strain curve at room temperature for a polymeric material from the start of the test to fracture. The slope of the curve at the point (0, 0) is 2.5 GPa. The graph is an idealized representation of one of the following materials. Which one? G 20 0 O,OT 0,02 0,03 0,04 005 strain An elastomer (e.g.vulcanized natural rubber) An elastomer (e.g. vulcanized natural rubber) polymeric glass (e.g. polystyrene) A partially crystalline thermoplastic polymer (e.g. polypropylene) A fiber reinforced composite (e.g. carbon fiber epoxy matrix composite)

Explanation / Answer

Brittle materials like polymeric glass will fail suddenly without any warning when load applied. These type of materials deosnt have any well defined yield point. Hence, most portion of stress strain curve is a straight line.

Therefore, second option is best answer.

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