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Dynamic Mechanical Analysis (DMA) Testing

DMA testing is a straightforward way to characterize materials in small-strain regimes, and is extremely useful for understanding the temperature and frequency response of polymers, including determining the glass transition temperature.   

Veryst uses Dynamic Mechanical Analysis (DMA) testing to characterize the viscoelastic response of materials over a wide range of temperatures and frequencies. The complex viscoelastic modulus of the material is determined by applying a sinusoidal stress or strain history. This test is repeated over a wide range of temperatures and frequencies, yielding valuable information that can be used to select and calibrate a material model for finite element analysis.

Veryst’s test machine (TA Instruments Q800, shown below) has test fixtures for tension, compression, shear, and cantilever bending, allowing us to test materials from soft foams and hydrogels to stiff thermoplastics. The graph below shows representative results for the storage and loss modulus of a stiff thermoplastic sample tested at multiple temperatures and frequencies, highlighting the change in material properties with applied temperature and frequency.  

       

       Storage Modulus measured at three different temperatures and multiple frequencies for a thermoplastic. Over this narrow range of temperatures, the storage modulus increases by 10%.  Additionally, the storage modulus increases with applied frequency.

 

 

Loss Modulus measured at three different temperatures and multiple frequencies for a thermoplastic. Over this
narrow range of temperatures, the storage modulus increases by 30%. Additionally, the loss modulus increases with applied frequency.


Veryst Engineering’s TA Instruments Q800 DMA.

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