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  1. Engineering
  2. Mechanical Engineering
  3. 3 polymers may only quote either yield or tensile strength...

Question: 3 polymers may only quote either yield or tensile strength...

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3. Polymers may only quote either yield or tensile strength. Provide any relevant comments on your results. Some points which you may wish to consider:

• Are the results what you expected (do they follow the trends of data in your references?).

• For alloyed metals (e.g. brass, steel if tested) can you suggest the alloy composition and condition by comparison with data in references?

........................................................................................................................................... (1) ]

• Compare 4 of the polymers tested with respect to their strength and Ductility. • Strongest Polymer to Weakest Polymer (1)

• ................................... ......................................... ................................ .................................

• Most Ductile Polymer to Least Ductile Polymer (1)

• ................................... ......................................... ................................ .................................

From the stress-strain characteristics, as indicated by your Excel Plots, rank the relative tensile toughness and Stiffness (i.e. the Youngs Modulus E) levels of the materials tested, giving your reasons 1 Most Tough Reason Reason 2 Next Toughest 2 Next Stiffest Reason Reason 3 Next Toughest 3 Next Stiffest Reason Reason 4 Least Stiff .. Reason Reason

Stress/ Strain 400 390 380 3 70 3 60 3 50 340 330 3 20 310 300 290 280 2 70 260 250 240 230 2 20 210 Brass Steel Alumi um HIPS 200 190 180 170 160 150 140 130 120 110 100 90 80 70 60 50 30 20 10 0.0000 0.0500 0.1000 0.150 2000 0.2500 0.3000 .3500 04000 04500 0.5000 0.5500 0 6000Force/Extention 5100 5000 4900 4800 4700 4600 4500 4400 4300 4200 4100 4000 3800 3700 3600 3500 3400 3300 3200 3100 3000 2900 2800 2700 2600 2500 2400 2300 2200 2100 2000 1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200 100 -brass lu mium HIPS 0.002.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00 28.00 30.00 EXTENSION

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