Dma curve rubber storage modulus

What is dynamic mechanical analysis (DMA)?

Dynamic mechanical analysis (DMA) is the technique of applying a stress or strain to a sample and analyzing the response to obtain phase angle and deformation data. These data allow the calculation of the damping or tan delta (δ) as well as complex modulus and viscosity data.

How can we determine storage and loss modulus from a single DMA experiment?

This means that by combining the directly observed complex modulus and phase angle, we can determine both the storage and loss modulus from a single DMA experiment. To convert the equations above from strain case to shear case, substitute G for E and γ for ε in the above equations.

What is storage modulus?

1.Storage Modulus (E’ or G’): This represents the material’s elastic behavior. It quantifies how much energy the material can store and release during each cycle of deformation. Mathematically, it is defined as the ratio of stress (σ) to strain (ε) amplitude multiplied by the cosine of the phase angle (δ):

What are DMA measurements?

In DMA measurements, the viscoelastic properties of a material are analyzed. The storage and loss moduli E’ and E’’ and the loss or damping factor tanδ are the main output values.

What is a material modulus?

The Modulus: Measure of materials overall resistance to deformation. Measure of elasticity of material. The ability of the material to store energy. The ability of the material to dissipate energy. Energy lost as heat. Measure of material damping - such as vibration or sound damping.

How do we measure the storage modulus and loss modulus?

For each frequency, we measure the storage modulus and loss modulus. Decomposition of the signal: We can extract the individual contributions of elastic and viscous behavior using the superposition principle. At low frequencies, the storage modulus dominates, indicating a more elastic response.