ME 111L Lab Unit 1 - polymers

ME 111L Lab Unit 1 - polymers - ME 111L Lab Unit 1 Polymers...

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ME 111L Lab Unit 1: Polymers Individual Work The polymethyl methacrylate (PMMA) is much stronger than the high-density polyethylene (HDPE). The PMMA’s fracture strength and initial tensile modulus of elasticity are much greater in value. Also, it deforms in a brittle manner while the HDPE is more ductile. The HDPE is about 90% crystalline while the PMMA is amorphous. The crystalline structure allows the HDPE to act more versatile and allows it to realign more readily. The PMMA is more rigid and does not realign readily, therefore its strain and area of reduction were minimal. The Polycarbonate (PC) was tested at two different speeds, 10 and 50 mm/min, and exhibited very similar mechanical behavior at each speed. In relation to the HDPE, it elongated a lot less, had a much higher average modulus of elasticity, and also had much greater values of upper and lower yield points (in MPA). In addition to all this, its reduction in area was about 50% less than HDPE’s. All these characteristics, plus the
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ME 111L Lab Unit 1 - polymers - ME 111L Lab Unit 1 Polymers...

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