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An Experimental Verification of Polymer Microcracking

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Presentation on theme: "An Experimental Verification of Polymer Microcracking"— Presentation transcript:

1 An Experimental Verification of Polymer Microcracking
Amy DiRienzo Department of Mechanical Engineering Advisor: David E. Walrath

2 Presentation Overview
Introduction Previous Work Research Objective Experimental Procedure Results Conclusions Future Work

3 Introduction Desire to model material response of PMMA
Described by an accumulation of submicrocracks in the material Previous work Frank, 1990 Niesent, 2009

4 Previous Work Frank, 2009

5 Previous Work, cont. Frank, 2009

6 Previous Work, cont. Frank, 2009

7 Previous Work, cont. Frank, 2009

8 Previous Work, cont. Frank, 2009

9 Previous Work, cont. Frank, 2009

10 Previous Work, cont. Frank, 2009

11 Previous Work, cont. Frank, 2009

12 Previous Work, cont. Niesent, 2009

13 Research Objective Obtain experimental data for transverse material response for high level stress history Niesent, 2009

14 Experimental Procedure
Design test specimens Machine test specimens Mount strain gages Configure load cell Execute tests

15 Specimen Design Dimensions conform to ASTM D 638
ASTM D 638-Standard Test Method for Tensile Properties of Plastics Type I-1/8 in thick Type II-1/2 in thick

16 Specimen Machining Specimens cut on Waterjet cutting machine

17 Strain Gages Mount strain gages Solder leads Prepare specimen surface
Bond gage General-purpose 90° tee rosette- gages oriented in loaded and transverse directions M-Bond AE-10 Adhesive System

18 Load Cell Configuration
Match high level stress history from Frank, 1990 Frank, 2009

19 Testing Load cell-Instron load frame

20 Results Unable to execute high level stress history

21 Results

22 Conclusions Strain data not useful in current study
Need high level stress history Incomplete strain responses obtained Unknown cause of premature failure Microcracking introduced during machining Adhesive weakened specimens Different material used

23 Future Work Reattempt current study
Use alternative method to machine specimens Use specified adhesive system Use new sheets of PMMA

24 Acknowledgements Wyoming EPSCoR Dr. David Walrath Kate Burton

25

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