Tensile Strength of different plastics - yataiiya/E45/PROJECTS/Strength of Plastics...  Tensile Strength

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  • Tensile Strength of different plastics

    Chloe Arnold, Chris Lan, Daniel Amador

    ENGR45, F2013, SRJC

  • Engr 45 project (plastics)

    Chloe Arnold Daniel Amador Chris Lan

  • Original Plan

    Carbon Fiber: Tensile strength Problem: Fixture needed for tensile machine

    and different from previous semesters.

    Last semesters problem:

  • Fixtures

    We designed a fixture to test carbon fiber. Problem: No source to obtain carbon fiber. Solution: Test plastics instead

  • Replacement for Carbon Fiber

    Plastics collected around the world: Polyethylene (two forms found)

    High density - Notebook Low Density - Tarp

    Polyvinyl Chloride (PVC) Pen case Polyvinyl Chloride (PVC) Shrink Wrap

  • PROBLEM!!

    Tested the plastics in the Tensile Machine Plastics were not strong enough.

    Ripped before any measurement.

  • Different Way to Test

    The string machine. Slightly altered the fixture for fitness and stability

    More precise Added on small amounts of mass (200-1000 grams) Measured stretch in cm Could track change so it yielded better data

  • Low Density Polyethylene

    Used in: Carrier bags Bin liners Packaging films Tarp

    Theoretical Youngs Modulus: 0.11-0.45 GPa

  • Graph of Data for Low Density Polyethylene (Tarp)

    Our Youngs Modulus: .290GPa

    0

    0.01

    0.02

    0.03

    0.04

    0.05

    0.06

    0.07

    0.08

    0 0.1 0.2 0.3 0.4

    Stre

    ss (G

    Pa)

    Strain

    y = 0.2902x + 0.003 R = 0.9667

    00.005

    0.010.015

    0.020.025

    0.030.035

    0.040.045

    0 0.1 0.2St

    ress

    (GPa

    )

    Strain

  • Low Density Polyethylene

    Theoretical Value: 0.11 to 0.45 GPA

    Our Value: 0.29

    It was in the range.

  • High Density Polyethylene

    Used in Milk bottles Bleach Cleaners Shampoo bottles Notebook cover

    Theoretical Youngs Modulus: 0.8 GPa

  • Graph of Data for High density Polyethylene (Notebook)

    Our Youngs Modulus: .937GPa

    y = 0.9374x + 0.0346 R = 0.8799

    00.020.040.060.08

    0.10.120.140.16

    0 0.05 0.1 0.15St

    ress

    (GPa

    ) Strain

    00.020.040.060.08

    0.10.120.140.16

    0 0.05 0.1 0.15

    Stre

    ss (G

    Pa)

    Strain

  • High Density Polyethylene

    Theoretical Youngs Modulus: 0.8 GPa

    Our Youngs Modulus: .937GPa

    Percent Difference: 14.6% Discrepancy because: -It barely stretched -Not enough mass to continue -Not enough space to add mass

  • Polyvinyl Chloride

    Used in Pipes Fittings Window and door frames

    Theoretical Youngs Modulus: 0.05 GPa

  • Graph of Data for Polyvinyl Chloride (Pen Case)

    Our Youngs Modulus: 0.158GPa

    y = 0.1583x + 0.0044 R = 0.96839

    0

    0.01

    0.02

    0.03

    0.04

    0.05

    0.06

    0 0.2 0.4St

    ress

    (GPa

    )

    Strain

    00.010.020.030.040.050.060.070.080.09

    0 0.5 1

    Stre

    ss (G

    Pa)

    Strain

  • Polyvinyl Chloride

    Our Value: 0.158

    Theoretical Youngs Modulus: 0.05

    Percent Difference: 216% Discrepancy because of: -Could have been a combination of different plastics. Therefore there would be a different value for Youngs modulus.

  • Polyvinyl Chloride (shrink film) Industrial shrink wrap containment of large plant equipment/components, Scaffold wrap containment of buildings/bridges, Building temporary shrink wrap structures for storage or other business

    operational uses, Marine shrink wrapping of boats and other vehicles.

  • Graph of Data for PVC (shrink film)

    0

    0.05

    0.1

    0.15

    0.2

    0.25

    0.3

    0 0.2 0.4 0.6 0.8

    Stre

    ss (G

    Pa)

    Strain

    y = 2.4814x - 0.0194 R = 0.93998

    00.020.040.060.08

    0.10.120.140.160.18

    0 0.05 0.1

    Stre

    ss (G

    Pa)

    Strain

    Our Youngs Modulus: 2.5Gpa

  • Polyvinyl Chloride (shrink film)

    Theoretical Youngs Modulus: 2.8GPa

    Our value: 2.5GPa

    Percent Difference: 11.1% Discrepancy because of: -Parallax -Thickness measurement

  • Comparing

    Highest to Lowest Youngs Modulus: 2.5 GPa Film Wrap .937 GPa Notebook .290 GPa Tarp .158 GPa Pen Case

  • LINK

    TYPES OF PLASTICS http://www.wrap.org.uk/content/types-plastic

    TYPE OF PACKAGE PLASTICS http://www.wrap.org.uk/content/types-plastic-packaging

    http://www.wrap.org.uk/content/types-plastichttp://www.wrap.org.uk/content/types-plastic-packaginghttp://www.wrap.org.uk/content/types-plastic-packaging

    Tensile Strength of different plasticsEngr 45 project (plastics)Original PlanFixturesReplacement for Carbon FiberPROBLEM!!Different Way to TestLow Density PolyethyleneGraph of Data for Low Density Polyethylene (Tarp)Low Density PolyethyleneHigh Density PolyethyleneGraph of Data for High density Polyethylene (Notebook)High Density PolyethylenePolyvinyl ChlorideGraph of Data for Polyvinyl Chloride(Pen Case)Polyvinyl ChloridePolyvinyl Chloride (shrink film)Graph of Data for PVC (shrink film)Polyvinyl Chloride (shrink film)ComparingLINK