MTS Systems Logo Contact Us
  • Industries
    • Automotive
      • Passenger Cars & Light Trucks
      • Driver Assisted & Autonomous Vehicles
      • Electric & New Energy Vehicles
      • Heavy Trucks & Commercial Vehicles
      • Off-Highway Vehicles (OHV)
      • Racing & Motorsports
      • Recreational Vehicles
      • Motorcycles
      Automotive

      Automotive

      320 kph

      flat-belt roadway enables precise replication of motorsports cornering maneuvers

      Read the Case Study
    • Materials
      • Metals
      • Composites
      • Plastics
      • Rubber & Elastomers
      • Adhesives
      • Concrete & Rock
      • Ceramics & Glass
      • Textiles
      • Wood
      • Paper Products
      • Universities
      Materials

      Materials

      1500 degree Celsius

      solutions for testing high-temperature alloys, composites, ceramics and polymers

      Read the Article
    • Aerospace
      • Fixed Wing Aircraft
      • Helicopters & Rotary Wing Aircraft
      • UAM (Urban Air Mobility)
      • Delivery Drones
      • Supersonic Aircraft
      • Space Structures
      Aerospace

      Aerospace

      20% increase

      in testing speeds using state-of-the-art cross-coupling compensation technology

      Read the Article
    • Biomedical
      • Orthopedic
      • Medical Devices
      • Dental
      • Hospitals & Universities
      Biomedical

      Biomedical

      1 in 1,000 children

      will need corrective scoliosis surgery

      Read the Case Study
    • Civil Engineering
      • Multi-Hazard Engineering
      • Seismic Engineering
      • Structural Engineering
      Civil Engineering

      Civil Engineering

      1.32 million pound

      force capacity enables the testing of very large specimens all the way to failure

      Read the Case Study
    • Rock Geomechanics
      • Fossil Fuels
      • Geothermal Energy
      • Mining
      • Construction
      • Carbon Sequestration
      • Research
      Rock Geomechanics

      Rock & Geomechanics

      3x stronger

      concrete materials make it possible to carry higher loads

      Read the Case Study
    • Energy
      • Wind Energy
      • Oil & Gas
      Energy

      Energy

      56 MNm

      overturning moment capacity enables testing of the largest wind turbine drivetrains

      Read the Article
    • Rail
      • Commuter Trains
      • Freight Trains
      • High-Speed Trains
      Rail

      Rail

      550 kph

      test system enables lab-based studies of high-speed rail operating environments

      Read the Article
  • Applications
    • Materials Applications
    • Test Type
      • Tension
      • Compression
      • Fatigue & Fracture
      • Flexure & Bend
      • Shear, Peel & Tear
      • Torsion
      • Non-Contacting Strain Measurement
      • High Temperature
      • Bi-Axial & Multi-Axial
      • High Rate
      • Dynamic Mechanical Analysis

      Material Applications by Material

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Test Standard
      • ASTM Test Standards
      • ISO Test Standards
      • EN Test Standards

      Material Applications by Material

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Materials
      • Metals
      • Composites
      • Plastics
      • Rubber & Elastomers
      • Adhesives
      • Fasteners & Welds
      • Concrete & Rock
      • Ceramics & Glass
      • Wood & Paper Products
      • Additive Manufacturing

      Material Applications by Material

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Automotive Applications
      • Full Vehicle
      • Axle & Suspension
      • Steering System
      • Drivetrain
      • Dampers
      • Elastomeric Mounts & Bushings
      • Tires
      • Exhaust System
      • Body Mounted Components
      • Cooling System Components
      • Transportation & Packaging
      • Motorcycle
      • Farm, Construction, Off-Highway Vehicles (OHV)

      Automotive

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Aerospace Applications
      • Complete Full-Scale Structures
      • Sub-Assemblies
      • Sub-Systems
      • Flight Control Systems
      • Airframe Components
      • Rotary-Wing Components
      • Gas Turbine Component Fatigue

      Aerospace

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Biomedical Applications
      • Orthopedic
      • Biomechanic
      • Medical Device
      • Biomaterial

      Biomedical

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Civil Engineering Applications
      • Civil Structures
      • Structural Sub-Assemblies & Components
      • Non-Structural Systems
      • Oil Rig Stay Cables
      • Construction Materials

      Civil Engineering

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Energy Applications
      • Wind Turbine Testing
      • Oil & Gas Pipeline

      Energy

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Rock Geomechanics Applications
      • Fossil Fuels
      • Geothermal
      • Nuclear Waste Storage

      Rock Geomechanics

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Rail Applications
      • Rail Car Suspension Components
      • Rail Car Coupler
      • Rail Car Wheels & Rail
      • Rail Car Axles
      • Rail Car Bogies
      • Complete Rail Cars
      • Rail Car Pantographs
      • Railway Track & Road Bed
      • Catenary & Trolley Wire

      Rail

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

  • Products
    • Automotive Systems
      • Full Vehicle Test Systems
      • Subsystem & Component Test Systems
      • Tire Test Systems
      • Damper Test Systems
      • Elastomer Test Systems
      • Hybrid Simulation Solutions
      • Modular Components

      Automotive

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Materials Test Systems
      • Static Materials Test Systems
      • Dynamic Materials Test Systems
      • Extensometers
      • Grips
      • Fixtures & Platens
      • Furnaces, Chambers & Fluid Baths
      • High Temp Subsystems & TMF
      • Load Cells / Force Transducers

      Materials

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Aerospace Systems
      • Turnkey Control & Data Acquisition
      • Turnkey Hydromechanical Power Distribution
      • Test Article Safety Solutions
      • Series 261 Structural Pressure Test Controller
      • High Force Test Systems
      • Modular Components
      • FlexDAC Data Acquisition Systems

      Aerospace

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Biomedical Systems
      • Orthopedic Test Systems
      • Biomechanic Test Systems
      • Medical Device Test Systems
      • Biomaterial Test Systems

      Biomedical

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Civil Engineering Systems
      • Seismic Simulators & Shake Tables
      • Multi-Axial Subassemblage Structural Test Systems
      • Hybrid Simulation Solutions
      • Seismic Isolation Bearing Test Systems
      • High-Force Test Systems
      • Modular Components
      • STEX Pro Software

      Civil Engineering

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Energy Systems
      • Wind Turbine Blade Fatigue Test Systems
      • Wind Turbine Blade Static Test Systems
      • Wind Turbine Blade Rain Erosion Test System
      • Wind Turbine Bearing & Drivetrain Test Systems
      • Oil & Gas Pipe / Coupling Test Systems
      • High-Force Test Systems
      • Modular Components

      Energy

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Rock & Geomechanics Systems
      • Rock Mechanics Test Systems
      • Polyaxial Rock Test System

      Rock Geomechanics

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Rail Systems
      • Air Spring Test System
      • Railway Damper Test System
      • Rolling Contact Fatigue (RCF) System
      • 4-28 Channel Bogie Frame Test System
      • Bogie Vibration & Characterization System
      • Pantograph Wear & Performance System
      • High-Force Test Systems
      • Damper Durability Test Systems
      • Elastomer Test Systems
      • Modular Components

      Rail

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Test System Components
      • Actuators & Servo-Valves
      • SilentFlo™ Hydraulic Power Units
      • 295 Hydraulic Service Manifolds
      • Stands & Frames
      • Load Bearing Components
      • FlexTest® Controllers
      • FlexDAC Data Acquisition
      • SWIFT® Evo Wheel Force Transducers

      Test System Components

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

    • Software & Monitoring
      • RPC® Connect Software
      • TestSuite™ Software
      • AeroPro™ Software
      • STEX™ Pro Software
      • Elastomer Testing Software
      • Damper Testing Software
      • MultiPurpose TestWare® (MPT)
      • First Road Interact Software
      • Multi-Pump Control Manager
      • Equipment Monitoring

      Software & Monitoring

      Solution Finder

      Search by Test Material, Test Type, or Test Standard to find relevant products fast.

  • Services
    • Services
      • Calibrations & Metrology
      • Consulting & Engineering Services
      • Equipment Monitoring
      • Routine Maintenance & Fluid Care
      • Repairs & Remanufacture
      • Relocation Services

      Services & Support

    • Plans
      • Software Support Plans
      • Technical Support Plans
      • Service Plans
      • Extended Warranty

      Services & Support

    • Training

      Training Courses

    • Parts

      Parts

    • Support

      myMTS Portal

  • Company
    • Our Company
      • About MTS
      • Global Presence
      • History

      Our Company

    • Careers

      Careers

    • Sustainability

      Sustainability

    • Suppliers
      • Supplier Home
      • Products & Services

      Suppliers

  • Solution Finder
  • Contact Us
  • R&D Test Systems
  • E2M Technologies
  • myMTS Portal
  • Global Sites
  • Search
Home > Changing Scope of DMA Testing

The Changing Scope of Dynamic Mechanical Analysis

Acumen
MTS Acumen Test Systems provide exceptional accuracy for DMA testing.
Why is there growing interest in viscoelastic testing?

Cars, planes, medical devices and consumer products are using more and more polymer and composite material in their designs. With the increasing use of structural components made from polymers and composites, understanding the viscoelastic properties of these materials becomes critical. Elastomers and polymers display significant viscous behavior that researchers and designers need to understand to make sure the material is appropriate for its intended end use.

Today, Finite Element Analysis (FEA) tools are using information about a material’s viscoelastic properties to more accurately predict how designs that contain these polymers or elastomers will perform. For example, the expanded use of Polymer Matrix Composites (commonly referred to as carbon fiber, or Carbon Fiber Reinforced Plastic) requires extensive dynamic mechanical analysis of the polymer component to predict how the stress will be shared between the polymer matrix and the reinforcement fibers.

What is a typical testing application for viscoelastic characterization?

Dynamic Mechanical Analysis (DMA) is a common way to measure the elastic (spring) and viscous (damping) behavior of materials and components. This measurement is achieved by subjecting the test specimen to a controlled cyclic stress (or strain) and measuring the force and displacement and their phase relationship.

DMA testing can be as simple as a test at a single frequency at room temperature to measure the Dynamic Stiffness (K*), Elastic Stiffness (K’), and/or Loss Stiffness (K”) of a component or material. DMA can also be very complicated with sweeps of excitation frequency, stress, strain, and temperature, including nesting those sweeps together to use an analysis method called Time Temperature Superposition (TTS). TTS can be used to predict the behavior of a material at temperatures and frequencies which are not feasible to test in practice.

What are some of the challenges with DMA testing?

DMA testing has one primary challenge, which is knowing if the data you have collected is accurate. That problem is not unique to DMA testing, but data accuracy is especially challenging to achieve with viscoelastic materials. It is difficult to know if the data is accurate because elastomers and polymers are very sensitive to many different factors including manufacturing processing, aging, temperature, composition (different batches of materials), preload stress/strain, and cyclic stress/strain. Given these variables, it is sometimes difficult to know if unexpected data is due to a bad sample, bad test protocol, or the machine actually producing inaccurate results.

Varying temperatures during Dynamic Mechanical Analysis generates another set of challenges. The two biggest challenges are maintaining the control system (tuning) of the test system as the specimen properties change and ensuring the specimen temperature is even and at the expected value.

Historically, how have engineers addressed the challenges of DMA testing?

The challenges of DMA testing have been addressed to varying degrees depending on the test machine type and the testing requirements. Dynamic Mechanical Analysis as an application is expanding beyond a chemical research tool used primarily by materials scientists, to become an increasingly important design tool used by engineers. DMA machines that are being used for Quality Control typically just need to evaluate if the sample properties are within a range. Some machines take the “black box” approach, which makes the machine very easy to operate, but may mask the potential issues that can generate inaccurate DMA data. Product developers and engineers need much more precise and accurate results than provided by this type of machine.

How can product developers and engineers maximize data accuracy?

There are many aspects of the test system that can influence testing accuracy. A good DMA test system must be very stiff to prevent unwanted resonances from impacting the data. It also must have a robust control system, be able to accurately measure forces and displacements, and have powerful software to take full advantage of all those characteristics.

It is also important to validate a system’s measurement accuracy. For example, every MTS Acumen Test System is tested to meet the dynamic measurement specification with a dynamic standard prior to leaving the factory. That verification of dynamic accuracy is performed at the end of installation to ensure the machine is producing accurate data once it is installed at the customer site. Since every Acumen DMA system includes the dynamic standard by default, the customer can repeat the dynamic accuracy measurement as desired to verify that the system is still producing accurate data.

In addition to elevating the need for increased measurement accuracy, how else have design engineers impacted Dynamic Mechanical Analysis requirements?

Engineers using elastomers and polymers in their designs will also need to know the strength and fatigue properties of those materials. However, machines dedicated solely to DMA are not capable of these types of testing. Because engineering design teams require more than just DMA data from their testing machine, an impact has been an increased need for either multiple systems or a more versatile test system.

Are there other influences that are changing DMA testing?

There has been a trend toward larger specimen sizes that is being driven by several factors. The first is the increasing use of composite materials in the automotive, aerospace and construction industries. Also, with composites and filled polymers, larger size samples are needed so that the cross-section of the materials has a statistically representative structure. Finally, viscoelastic property measurements can be sensitive to specimen size, so it is ideal to test material samples that closely resemble the end use component.

How has the trend toward larger specimen sizes affected DMA testing?

The primary impact of the larger specimen sizes is the need for larger and more powerful machines. The DMA machines of old were only capable of applying a few pounds (~30 Newtons) of force. Larger specimens may require hundreds, sometimes even thousands of Newtons of force.

What predictions do you have for the future of viscoelastic characterization, and specifically for DMA testing?

Both the need for multiple types of testing and the trend toward testing larger specimens will drive an increase in multi-use machines for viscoelastic testing, including for DMA applications. Yet, not every materials test system can be classified as a DMA system. Some machines that are marketed as suitable for DMA, gloss over the critical accuracy requirements and only report out results. Some manufacturers simply add calculations to a fatigue testing machine and then call it a DMA machine. Usually multi-use machines require a significant number of compromises, but some, like the MTS Acumen Test System, are equipped to provide accurate results for DMA, monotonic and fatigue testing, allowing an unprecedented level of versatility for a test lab.

dynamic-analysis

See solutions for common DMA testing standards.

DMA Standards
Also of Interest:
  • Materials Tensile Test Applications >
  • Additive Manufacturing Test Applications >
  • Hydraulic Actuators & Servo-Valves >
Stay Connected
  • INDUSTRIES
  • Automotive
  • Materials
  • Aerospace
  • Biomedical
  • Civil Engineering
  • Rock Geomechanics
  • Energy
  • Rail
  • SALES & SUPPORT
  • Sales Offices
  • Services
  • Training
  • Parts
  • Customer Portal
  • SUPPLIERS
  • Terms & Conditions
  • Products & Services
  • Expectations
  • Workmanship Standards
  • Packaging & Labeling
  • Routing Guide
  • COMPANY
  • About
  • News
  • Careers
  • Culture
  • Sustainability
  • History
  • SOLUTIONS
  • Applications
  • Test Standards
  • Products
  • RESOURCES
  • Learning Center
  • Solution Finder
  • Quality
  • Product Safety
  • Patents
  • CONTACT US
  • SUPPORT: 952-937-4000
  • Online Request
  • Request A Quote
  • Sales Offices
  • BUSINESSES
  • MTS Systems
  • E2M Technologies
  • R&D Test Systems
  • MTS SANS China
    • © MTS Systems. All Rights Reserved
    • 952.937.4000
    • Privacy Policy
    • Terms Of Use
    • Terms & Conditions
    • Sales Offices
    • Cookie Preferences
We use necessary cookies to make our site work. We'd also like to set up optional analytics cookies to help us improve it. We won't set optional cookies unless you enable them.
Decline Accept
We use necessary cookies to make our site work. We'd also like to set up optional analytics cookies to help us improve it. We won't set optional cookies unless you enable them.
Decline Accept