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Dynamic Mechanical Analysis

What is dynamic mechanical analysis?

Dynamic mechanical analysis (DMA) is a technique used to study mechanical properties of objects, typically viscoelastic properties of polymer materials. Traditionally, this involves understanding the viscous and elastic mechanical properties of a polymeric material under a constant deflection. In this case, DMA is a powerful tool for monitoring the strain of a material when a sinusoidal stress is applied and allows the understanding of complex time dependent moduli.

What properties can you obtain with DMA?

Many time-, frequency- and temperature-dependent properties of polymers can be elucidated from DMA experimentation. The storage modulus (E’ or G’) of a material can be measured, along with the Young’s modulus. Shear, bulk and compressive moduli can be determined through different stressing modes. By modulating the temperature with respect to a constant stress, the glass transition temperature can be also elucidated. Crack propagation experimentation can be used to follow defect formation within a polymer material and may shed insight into how tough a material behaves.

Application Space

 

There is a wide range of applications which DMA measurements may be applicable for, including:

 

Dynamic Mechanical Analysis Testing Services

  • Viscoelastic materials
  • Rubber materials
  • Polymer composition
  • Glass transition temperature determination
  • Crack-fatigue monitoring
  • Crack propagation

Recommended Methods

Dynamic Mechanical Analysis Testing Services

Excitation Frequencies 0.00001  200 Hz
Maximum Dynamic Force 300 N peak to peak
Maximum Dynamic displacement 12 mm peak to peak
Temperature Range -70  500 °C
Modulus Range 250  3×1012 Pa
Measurement Range > 7 decades

 

Other methods may be available. Contact us at info@thermalanalysislabs.com or call (506) 457-0498 to discuss.

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