Title: Viscoelastic Response Characterization of Ultra High Molecular Weight Polyethylene Composite After Uv Aging
Authors: Jonmichael A. Weaver, David A. Miller
Abstract: Ultra High Molecular Weight Polyethylene (UHMWPE) presents several distinct advantages as a material with a high strength to weight ratio, durability, and hydrophobicity. Characterizing the change in the mechanical performance of UHMWPE from environmental exposure is necessary to ensure the safety of future applications. UV aging tests based on ASTM-G154 were performed on Dyneema® HB-210 for 200 hours to interrogate the change in mechanical properties as measured through dynamic mechanical analysis (DMA). Dyneema® HB-210 is a 15 µm diameter UHMWPE multi-filament fiber laid up in a polyurethane matrix [0/ 90]2 with a thickness of 0.17mm. This composite was aged under UV, humidity, and temperature cycling conditions to investigate changes in viscoelastic material properties. DMA analysis was conducted using, stress relaxation, creep, and single frequency strain tests. These results are compared and contrasted over the combined UV, humidity, and temperature cycling profiles for times up to 200 hours. The composite showed a slight increase in the average tan delta with aging, and a slight decrease in the strain over temperature with aging. However, stochastic behavior may be present as the unaged conditions occasionally did not follow the aging trend of the rest of the samples. The temperature cycling without added humidity did not affect the material properties in a discernible manner compared the combined UV and humidity tests.
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Conference: CAMX 2022
Publication Date: 2022/10/17
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