Gregory T. Hayes

Gregory T. Hayes

State College, Pennsylvania, United States
2K followers 500+ connections

Activity

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Experience

  • Kish Bank Graphic

    Kish Bank

    United States

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    State College, Pennsylvania Area

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    CE 5755 - State College, PA

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    State College, Pennsylvania

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    State College, Pennsylvania Area

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    Reesdville, PA

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    Reedsville, PA

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    State College, Pennsylvania Area

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    State College, Pennsylvania Area

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    Reedsville, PA

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    Lewistown, Pa

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    McLean, Virginia

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Education

  • Lafayette College Graphic

    Lafayette College

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    Activities and Societies: Rowing Team - Captain, Club President, and part-time coach. American Society of Mechanical Engineers - Chapter President. Chi Phi Fraternity- House Manager, Vice President, and Pledge Master.

Volunteer Experience

Publications

  • Biaxial Stress Relaxation of High Impact Polystyrene (HIPS) Above the Glass Transition Temperature

    Polymer Engineering and Science

    A procedure was developed and experiments were performed to measure the biaxial stress relaxation of High Impact Polystyrene (HIPS) sheets above the glass transition temperature. Tests were performed at various temperatures and strain magnitudes. The data were normalized to unity at time zero to isolate the time dependence of the stress from the strain dependence. The results show that the time dependent biaxial stress relaxation properties were independent of the magnitude of the stress or…

    A procedure was developed and experiments were performed to measure the biaxial stress relaxation of High Impact Polystyrene (HIPS) sheets above the glass transition temperature. Tests were performed at various temperatures and strain magnitudes. The data were normalized to unity at time zero to isolate the time dependence of the stress from the strain dependence. The results show that the time dependent biaxial stress relaxation properties were independent of the magnitude of the stress or strain for small strains. The stress relaxation curves were fitted to a Prony series and it was found that time-temperature superposition could be applied to interpolate the normalized relaxation. Uniaxial stress relaxation tests were also performed and the results were compared to that of the biaxial testing program.

    Other authors
    • DR. SCOTT R. HUMMEL
    • KISHWAR HOSSAIN
    See publication

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