Category: Loss and Storage Modulus


Precise Localized Glass Transition with Nanoindentation DMA

Imagine a scenario where a bulk sample is uniformly heated at a constant rate. As a bulk material heats up and approaches its melting point, it will start to lose its rigidity. If periodic indentations (hardness tests) are conducted at the same target force, the depth of each indent should be constantly increasing since the sample is becoming softer (see figure 1). This continues until the sample begins to melt. At this point, a large increase in the depth per indent will be observed. Using this concept, phase change in a material can be observed by using dynamic oscillations with a fixed force amplitude and measuring its displacement, i.e. Dynamic Mechanical Analysis (DMA).   Read about Precise Localized Glass Transition!

Viscoelastic Analysis of Rubber

Viscoelasticity is referred to as the property of materials that exhibit both viscous and elastic characteristics
when undergoing deformation.

A viscous material resists shear ow and strains linearly with time when a stress is applied, unlike an elastic
material that strains immediately when stressed and returns to original state once the stress is removed. A
viscoelastic material exhibits elements of both properties and therefore has a complex modulus.

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Dynamic Mechanical Analysis With Nanoindentation

The quality of corks depends heavily on its mechanical and physical property. Its ability to seal wine can be identified as these important factors: flexibility, insulation, resilience, and impermeability to gas and liquids. By conducting dynamic mechanical analysis (DMA) testing, its flexibility and resilience properties can be gauged with a quantifiable method. These properties are characterized with Nanovea Mechanical Tester’s Nanoindentaion in the form of Young’s modulus, storage modulus, loss modulus, and tan delta (tan (δ)). Other data that can be gathered from DMA testing are phase shift, hardness, stress, and strain of the material.

Dynamic Mechanical Analysis With Nanoindentation

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