Lab 6.docx - Laboratory 6 Creep of Polymeric Materials CEE 3020 Civil Engineering Materials Submitted to Dr David Scott by Whitney Lehrer Section A4

Lab 6.docx - Laboratory 6 Creep of Polymeric Materials CEE...

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Laboratory 6: Creep of Polymeric Materials CEE 3020 Civil Engineering Materials Submitted to: Dr. David Scott by: Whitney Lehrer Section A4 Group C Zichen Bai Nicholas Vo Abstract 10% Introduction 10% Experiment 5% Results 25% Discussion 25% Conclusion 10% Technical Writing 10% Graphics: Design 5% TOTAL April 23, 2019
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Abstract Polymeric materials are becoming increasingly important in civil engineering, and as such, it is critical to understand their properties. Creep, defined as the plastic deformation over time, is one of these properties. Because creep can ultimately lead to failure of the polymer, it is important to understand and be able to classify creep in different polymers under different loading conditions. The objective of this experiment is to subject a polymeric material at room temperature to three uniaxial loads in order to characterize the steady-state creep behavior. To achieve this, 3 specimens of similar length 4-lb. monofilament fishing line are loaded with 3-, 2-, and 1-lb. weights. The change in length is recorded over a 96-hour period to completely describe the primary, secondary, and tertiary creep. The creep strain rate is also calculated and compared. The 3-lb. specimen experiences a total creep of 3/16 inches and a secondary creep strain rate of 5.76e- 6 min -1 . The 2-lb. line has 3/32 inches total elongation and a secondary creep strain rate of 3.50e- 6 min -1 . The 1-lb. line experiences 1/32 inches elongation and a secondary creep strain rate of 0 min -1 . These results indicated that higher loading gives higher creep and creep strain rate, which is to be expected based on the properties of polymers. The results do not confirm the applicability of the power law model for creep rate, however, this is likely due to inaccurate experimental data.
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Table of Contents Introduction ....................................................................................................................................... 1 Experiment ........................................................................................................................................ 1 Materials .............................................................................................................................. 1 Equipment ............................................................................................................................ 1 Procedure ............................................................................................................................. 1 Results ............................................................................................................................................... 4 Discussion ......................................................................................................................................... 5 Conclusions ....................................................................................................................................... 6 References ......................................................................................................................................... 7 Appendix ........................................................................................................................................... 8
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Introduction Creep, which is plastic deformation over time, is an important attribute of polymers (Scott, 2019). It is critical to understand creep, as it can ultimately lead to failure of the material. Differing polymeric materials experience different creep, as it is indicative of the properties of the polymer. The objective of this experiment is to characterize the steady-state creep behavior of 4-lb. monofilament fishing line at form temperature using uniaxial loading on creep deformation. Having an understanding of creep will allow for better design and safety of polymer materials.
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