Dynamic Mechanical Analysis measures the mechanical properties of materials as a function of time, temperature, and frequency. In addition to quantifying viscoelastic properties of materials, DMA can also quantify finished component and product characteristics, reflecting the important contribution that processing has on end-use product performance. DMA is commonly used to measure glass transition temperatures (Tg) and secondary transitions, orientation caused by processing, cold crystallization, cure optimization, filler effects in composites, and much more. DMA provides an accurate measure of material modulus and product stiffness plus other important mechanical properties such as damping, creep, and stress relaxation.
A Dynamic Mechanical Analyzer is a mechanical instrument that applies specific displacement or force to a sample and very accurately quantifies its force versus displacement response. Its measurements extend beyond simply quantifying the magnitude of force divided by the displacement magnitude; it accurately calculates the phase relationship between the signals. This enables a DMA instrument to quantify the elastic (spring-like) versus viscous (fluid-like) components of the sample response which is crucial for reliable and complete viscoelastic property characterization such as Storage Modulus, Loss Modulus, and Tan delta. These viscoelastic properties are almost always evaluated over a range of temperatures, using oven and cooling accessories, which then can provide many insights into structure-property relationships and how materials perform at different use temperatures. Some advanced methods include TTS (Time-Temperature Superposition), curing studies, creep-recovery, and stress-relaxation analysis.
The wide range of TA Dynamic Mechanical Analyzers is not only the best-selling in the world, but also covers the widest range of forces and applications. The best-selling DMA850 delivers an incredible wide range of force measurements from 0.1 mN to 18 N and with the One-Touch-Away interface, DMA Express mode is the easiest and most often used method to evaluate glass transitions and secondary transitions of solid materials. It also enables characterization of the effects of humidity. The RSA-G2 is a research-grade DMA that delivers up to 35 N of force, a dielectric stimulation accessory, and offers a high-precision Force Convection Oven (FCO) for stable and fast ramping temperature control. Finally, TA Instruments’ series of High-Force DMA instruments extend the insights revealed by DMA to higher forces and samples sizes, providing valuable insights when materials cannot be miniaturized or for components or products that are larger in size. They also add highly durable and fast fatigue test methods, delivering as much as 15,000 Newtons of force in the largest HF-DMA model.