Dma storage modulus standard

What is dynamic mechanical analysis (DMA)?

Dynamic Mechanical Analysis (DMA) determines elastic modulus (or storage modulus, G'), viscous modulus (or loss modulus, G'') and damping coefficient (Tan D) as a function of temperature, frequency or time. Scope: Examples of standards: ASTM D4065, D4440, D5279

What are the outputs of DMA?

The outputs of Dynamic Mechanical Analysis (DMA) are the Elastic or Storage (E') and Loss (E'') moduli as a function of frequency and temperature. The ratio between storage and loss modulus produces a response curve known as tan delta (also called damping), which is a measure of the energy dissipation of a material.

What is a DMA standard?

Scope: Examples of standards: ASTM D4065, D4440, D5279 Results are typically provided as a graphical plot of G', G'', and Tan D versus temperature. DMA identifies transition regions in plastics, such as the glass transition, and may be used for quality control or product development.

Why is DMA used in mechanical analysis of polymeric materials?

In our opinion, DMA is a powerful technique used for the mechanical analysis of polymeric materials. It provides valuable information about the properties of materials, such as the elastic modulus, viscous modulus, and damping coefficient, and can identify small transition regions that are beyond the resolution of other techniques.

What are the input parameters of a DMA test?

The input parameters include frequency, amplitude, and a temperature range appropriate for the material. The test specimens are typically 56 x 13 x 3 mm, cut from the center section of an ASTM Type I tensile bar or an ISO multipurpose test specimen. The key properties that can be determined using DMA are the Tan Delta and complex modulus.

What is a complex modulus?

The complex modulus is the vector sum of the storage (Elastic) G' and loss (viscous) G'' components. Various techniques can be used to determine the glass transition temperature (Tg) by DMA, such as the peak on the Tan Delta curve, peak on the loss modulus curve, half height of storage modulus curve, and onset of storage modulus curve.