An Experimental Verification of Polymer Microcracking

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Presentation transcript:

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

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

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

Previous Work Frank, 2009

Previous Work, cont. Frank, 2009

Previous Work, cont. Frank, 2009

Previous Work, cont. Frank, 2009

Previous Work, cont. Frank, 2009

Previous Work, cont. Frank, 2009

Previous Work, cont. Frank, 2009

Previous Work, cont. Frank, 2009

Previous Work, cont. Niesent, 2009

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

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

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

Specimen Machining Specimens cut on Waterjet cutting machine

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

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

Testing Load cell-Instron load frame

Results Unable to execute high level stress history

Results

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

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

Acknowledgements Wyoming EPSCoR Dr. David Walrath Kate Burton

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