Dynamic mechanical analysis (abbreviated DMA) is a technique used to study and characterize materials. It is most useful for studying the viscoelastic behavior of polymers. A sinusoidal stress is applied and the strain in the material is measured, allowing …

DMA （Dynamic mechanical analysis） 动态热机械分析， 它是一种用于测量粘弹性材料的固态流变特性随频率和温度变化的技术。 常用于 动态力学测试，主要测定在一定控制条件下，材料的温度、频率、时间、应力、应变与动态模量、损耗参数之间的关系，确定 玻璃化 ...

An ideally elastic material reacts immediately, without any delay. The sinusoidal stress and strain curves show no phase shift, thus δ is zero. The stress and strain curves of an ideally viscous material show a phase shift angle of δ = 90 °. And as the term viscoelasticity suggests, the behavior of viscoelastic materials is a mixture of the two.

由DMA可测出相位角tanδ、损耗模量E"与贮能模量E´随温度、频率或时间变化的曲线，不仅给出宽广的温度、频率范围的力学性能，还可以检测材料的玻璃化转变、低温转变和次级松弛过程。

Dynamic mechanical analysis is an essential analytical technique for determining the viscoelastic properties of polymers. Unlike many comparable methods, DMA can provide information on major and minor transitions of materials; it is also more sensitive to changes after the glass transition temperature of polymers.

Accelerated testing procedures based upon principles of time-temperature superpositioning proposed by Williams, Landel, and Ferry1 were devised to create “doubly-reduced” master curves of the observed mechanical response. The diffusion phenomenon was introduced via the creation of a diffusion-time shift factor.

原理动态热机械分析（DMA，Dynamic thermomechanical analysis）是在程序控制温度下，对试样施加交变应力 ( 或应变) ，测量材料的应变 ( 或应力) 随温度、时间或者频率响应的热分析方法。

2018年5月21日 · DMA (Dynamic Mechanical Analyzer) 動態熱機械分析儀，其原理是使樣品處於程式控制的溫度下，通過對材料樣品施加一個已知振幅和頻率的振動，測量損耗因數 (Tan δ)隨溫度、時間、力量與頻率的函數關係，用以精確測定材料的儲存模數 (E’)、損失模數 (E”)、楊氏係數 ...

2018年5月21日 · DMA (Dynamic Mechanical Analyzer) 动态热机械分析仪，其原理是使样品处于程式控制的温度下，通过对材料样品施加一个已知振幅和频率的振动，测量损耗因数 (Tan δ)随温度、时间、力量与频率的函数关系，用以精确测定材料的储存模数 (E’)、损失模数 (E”)、杨氏系数 ...

Dynamic Mechanical Analysis, otherwise known as DMA, is a technique where a small deformation is applied to a sample in a cyclic manner. This allows the materials response to stress, temperature, frequency and other values to be studied. The term is also used to refer to the analyzer that performs the test.