In episode 4 of our Boedeker TECH Talk series our Technical Services Manager, Jim Hebel provides an in-depth overview of the Dynamic Mechanical Analysis (DMA) Curve. The DMA curve is a very powerful set of test data that provides designers, engineers and others relative stiffness or modulus data over a wide temperature range for plastic material selection by application. The DMA curve provides greater insight into how a polymer will perform relative to the stiffness and mechanical properties over its various state changes from an elastic or solid to a viscous or liquid state over a temperature range. Many experts consider the DMA curve to be a better tool than test data from CUT (Continious Use Temp) or HDT (Heat Deflection Temp) as a reference for material selection related to stiffness at temperature.
This video provides a brief summary of why a plastic is considered a viscoelastic material and how the DMA curve can be used to successfully select plastics relative to stiffness and temperature. Other topics include glass transition temperature with basic examples of unfilled amorphous and semicrystalline thermoplastics and the effect that fillers like glass and carbon have on stiffness and stability. Both unfilled Ultem PEI and PEEK are highlighted, along with 30% carbon filled PEEK.
This TECH Talk is ideal for anyone looking for more information on DMA curves relative to how they are created and the theory behind them and best practices for using a DMA curve for optimal material selection.
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31 июл 2024
