Dynamic Mechanical Analysis (DMA)

ARDL’s capabilities for Dynamic Mechanical Analysis (DMA) and Dynamic Thermal Mechanical Analysis (DTMA) include coefficient of linear thermal expansion, forced vibration and glass transition temperature testing.

Coefficient of Linear Thermal Expansion

As a polymer material is heated or cooled, its molecules become more or less excited and so its length changes in proportion to its original length. Our Chemical Services and Engineering Services laboratories test for this using specifications for coefficient of linear thermal expansion (CLTE) by use of a vitreous silica dilatometer. Changes in moisture content, curing, loss of plasticizer or solvents, release of stresses, phase changes and other factors can also occur when the material is exposed to elevated temperatures and the test is designed to exclude these variables in its measurement to provide truest thermal expansion.

Forced Vibration

ARDL’s testing capabilities allow us to measure the forced vibration of materials through dynamic mechanical analysis. Forced vibration is vibration caused by one object being forced to vibrate when another connected object is vibrated.  Using specific test methodologies and fixturing, we are able to measure the response of materials when forced into vibration.

Glass Transition Temperature Testing

The introduction of heat, cooling or compression can have an effect on the properties of materials.  When these environments cause the material to change from exhibiting solid-like properties to a liquid-like phase, the material is said to have passed through its glass transition temperature (Tg).  ARDL measures glass transition using Dynamic Mechanical Analyzer (DMA) and Dynamic Thermal Mechanical Analyzer (DTMA) equipment in addition to Differential Scanning Calorimetry (DSC) methods. According to ASTM, Dynamic Mechanical Analyzers monitor changes in the viscoelastic properties of a material as a function of temperature and frequency, providing a means to quantify these changes.  In ideal cases, the temperature of the onset of the decrease in storage modulus marks the glass transition.  Our DTMA equipment provides for analysis using frequency and temperature sweeps.  ARDL can also test using three-point bend, Metravib and other DMA equipment.
 

Available Methods

Dynamic Mechanical Analysis (DMA) - Dynamic Testing of Vulcanized Rubber - Vibratory Method

Standard Guide for Dynamic Testing of Vulcanized Rubber and Rubber-Like Materials Using Vibratory Methods

ASTM D 5992

Dynamic Mechanical Analysis (DMA) - Forced Vibration

Standard Practice for Rubber Properties in Forced Vibration

ASTM D 2231

Dynamic Mechanical Analysis (DMA) - Glass Transition, Tg - Dynamic Mechanical Analysis Method

Standard Test Method for Assignment of the Glass Transition Temperature By Dynamic Mechanical Analysis

ASTM E 1640

Dynamic Mechanical Analysis (DMA) - Plastics

Standard Practice for Plastics: Dynamic Mechanical Properties: Determination and Report of Procedures

ASTM D 4065

Dynamic Mechanical Analysis (DMA) - Plastics Properties

Standard Terminology for Plastics: Dynamic Mechanical Properties

ASTM D 4092

Metravib - DMA Testing - Compression

Standard Guide for Dynamic Testing of Vulcanized Rubber and Rubber-Like Materials Using Vibratory Methods

ASTM D 5992 - Compression

Metravib - DMA Testing - Dual Lap Shear

Standard Guide for Dynamic Testing of Vulcanized Rubber and Rubber-Like Materials Using Vibratory Methods

ASTM D 5992 - Dual Lap Shear

Metravib - DMA Testing - Tension

Standard Guide for Dynamic Testing of Vulcanized Rubber and Rubber-Like Materials Using Vibratory Methods

ASTM D 5992 - Tension

MTS - DMA Testing - Compression

Standard Guide for Dynamic Testing of Vulcanized Rubber and Rubber-Like Materials Using Vibratory Methods

ASTM D 5992 - Compression

MTS - DMA Testing - Dual Lap Shear

Standard Guide for Dynamic Testing of Vulcanized Rubber and Rubber-Like Materials Using Vibratory Methods

ASTM D 5992 - Dual Lap Shear

MTS - DMA Testing - Quad Lap Shear

Standard Guide for Dynamic Testing of Vulcanized Rubber and Rubber-Like Materials Using Vibratory Methods

ASTM D 5992 - Quad Lap Shear

MTS - DMA Testing - Tension

Standard Guide for Dynamic Testing of Vulcanized Rubber and Rubber-Like Materials Using Vibratory Methods

ASTM D 5992 - Tension