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'''Dynamic mechanical analysis''' (abbreviated '''DMA''') is a technique used to study and characterize materials. It is most useful for studying the [[viscoelastic]] behavior of [[polymer|polymers]]. A sinusoidal stress is applied and the strain in the material is measured, allowing one to determine the [[Dynamic modulus|complex modulus]]. The temperature of the sample or the frequency of the stress are often varied, leading to variations in the complex modulus; this approach can be used to locate the [[glass transition]] temperature<ref>{{cite web |url=https://coventivecomposites.com/explainers/dynamic-mechanical-analysis-dma/|accessdate=2018-10-01|title=What is Dynamic Mechanical Analysis (DMA)?}}</ref> of the material, as well as to identify transitions corresponding to other molecular motions.
==Theory==
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