DMA analysis (Dynamic Mechanical analysis) in the laboratory
As an industrial company, would you like to perform a DMA analysis of your materials?
What is DMA analysis?
With this technique, the sample is subjected to periodic stress according to different deformation modes (tension, shear, compression). The modulus is then measured as a function of temperature or time. This provides valuable information about phase transitions in materials.
What is DMTA analysis?
DMTA (Dynamic Mechanical Thermal Analysis) is an extension of DMA that focuses on the impact of temperature on the dynamic mechanical properties of materials. It identifies thermal transitions, such as the glass transition, by varying the temperature in a controlled manner.
Advantages of DMA analysis
DMA Analysis
Characterizes the viscoelastic properties of materials, including the storage modulus (E′E'E′), loss modulus (E′′E''E′′), and loss factor (tan(δ)tan(\delta)tan(δ)).
Detects phase transitions, such as the glass transition, and structural changes as a function of temperature or frequency.
Accurate for evaluating mechanical properties under dynamic conditions, such as stiffness, strength, and damping.
Useful for comparing material performance under various conditions (temperature, frequency, humidity).
A non-destructive technique that evaluates material performance without damaging the materials.
When should the DMA technique be used in the laboratory?
To study polymeric, composite, and elastomeric materials subjected to mechanical and thermal stresses.
To analyze the effects of thermal or mechanical aging on materials.
During the research and development of new materials, to evaluate their mechanical behavior under different operating conditions.
When it is necessary to measure mechanical strength and viscoelastic properties as a function of temperature or frequency.
To understand material performance in applications involving vibrations, thermal cycles, or repeated stresses.
FILAB laboratory supports you with DMA analysis
Our dynamic mechanical analysis services
As part of a dynamic mechanical analysis (DMA), FILAB laboratory can perform the following analysis:
Measurement of the storage modulus (G') and loss modulus (G'')
Frequency dependence analysis
Stress relaxation study
Loss factor evaluation (tan δ)
Determination of the glass transition temperature (Tg)
Frequency dependence analysis
Dynamic mechanical fatigue analysis
Density measurement by capillary densimetry
Why perform a dynamic mechanical analysis?
Through dynamic mechanical analysis, or “DMA mechanical analysis” in English, it is possible to gain a detailed understanding of the mechanical properties of materials and structural changes, such as their fracture resistance, elasticity, and response to shocks and vibrations, depending on temperature, frequency, and strain rate.
These measurements are important for numerous applications in fields such as aerospace and automotive, where strength and durability are essential.
The results obtained make it possible to design higher-performance, more durable materials for specific applications.
Our dynamic mechanical analysis services
As part of a dynamic mechanical analysis (DMA), the FILAB laboratory can perform the following analysis:
To evaluate the stiffness and viscoelasticity of materials under dynamic deformation.
Essential for understanding phase changes and polymer performance at different temperatures.
To observe the mechanical response of materials at different strain rates, which is useful for applications subject to varying dynamic stresses.
To evaluate the material's ability to dissipate internal stresses over time.
To predict the service life of materials under repeated load cycles.
To identify the transition point between elastic and viscous behavior for the design of damping materials.
Materials covered by dynamic mechanical analysis
Materials subjected to dynamic mechanical analysis include, in particular:
The thermoplastic polymers used in packaging, automotive components, and electronic devices, where performance under stress and temperature is critical.
Polymer matrix composites: used in aerospace and automotive applications, where strength and light weight are essential for structural components.
The elastomeric rubbers used in seals, tires, and vibration-damping components, where durability and fatigue resistance are important.
Thermosetting polymers: such as epoxy resins, used in adhesives, coatings, and construction materials.
Polymer films: used in flexible packaging and medical devices, where flexibility and mechanical strength across different temperatures are important.
Fiber-reinforced composites: used in sports equipment and marine structures, where impact and wear resistance are essential.
Solid pharmaceutical materials: used in tablets and capsules, where mechanical stability under different storage conditions is evaluated.
Polymers for medical devices: used in implants and prostheses, where viscoelastic behavior influences performance and biocompatibility.
Viscoelastic analysis and relaxation spectrum
DMA analysis enables industries to characterize viscoelastic materials by measuring the storage modulus (E′E’E′) and loss modulus (E′′E”E′′), as well as the loss factor. This technique helps assess a material’s ability to absorb and dissipate mechanical energy under stress, thereby ensuring mechanical performance under different operating conditions.
The relaxation spectrum, obtained through DMA, makes it possible to visualize the relaxation times of materials. It helps identify thermal transitions (such as the glass transition) and energy-dissipation mechanisms as a function of temperature or frequency, thereby optimizing material selection for specific industrial applications.
Our polymer services
Complex Coulomb Modules
Experimental conditions for DMA analysis in the laboratory
Dynamic mechanical analysis in the laboratory requires specific experimental conditions to ensure the reliability of the results obtained.
Factors such as test frequency, applied load, application speed and force, temperature, and humidity must be carefully controlled to ensure that samples are subjected to the same conditions in all tests. This rigor helps minimize the effects of thermal expansion, ensure measurement accuracy, and guarantee result reproducibility.
By using advanced simulation methods, we can accurately determine how your products and materials will behave under real-world conditions. Through this analysis, we can ensure that products withstand prolonged loads and operating conditions.
ISO 6721 standard – DMA for plastics:
The ISO 6721 standard defines methods for determining the dynamic viscoelastic properties of plastic materials. It specifies procedures for measuring storage and loss moduli, the loss factor, and behavior as a function of frequency and temperature.
This standard ensures comparable and reliable results in the dynamic mechanical analysis of plastics, enabling manufacturers to validate material performance in accordance with regulatory requirements and quality standards.
Other thermal or mechanical analysis services
Our polymer services
FAQ
Dynamic mechanical analysis (DMA) is a powerful and versatile technique for characterizing the mechanical properties of materials. It measures how a material responds to an applied force in terms of elastic modulus, stiffness, strength, damping capacity, and more. It can be used to evaluate the behavior of polymers, elastomers, composites, ceramics, and metals under various conditions, such as temperature and humidity. Dynamic mechanical analysis can provide valuable information about material performance characteristics in different environments that cannot be obtained by other means.
Dynamic mechanical analysis is used in many industries, including automotive, aerospace, biomedical, consumer product testing, construction materials, and more. In automotive applications, the analysis is often used to assess the stiffness, strength, and fatigue resistance of components such as engine mounts or suspension systems. Regardless of the industry, DMA provides valuable insights that enable manufacturers to ensure their products meet the required safety standards.
The main difference between DMA and TMA (thermomechanical analysis) is that the former measures mechanical properties, while the latter measures thermal expansion. Both techniques require a sample to be subjected to an external force, making it possible to measure various properties such as stiffness and damping capacity. However, in thermomechanical analysis, the sample is subjected to an increase in temperature instead of an applied force. TMA can measure the thermal expansion of a material, which can be used to assess its overall behavior under different environmental conditions.
DMA offers several advantages for the industrial sector, including the ability to characterize the mechanical properties of materials under real-world operating conditions. It helps predict material performance in specific applications, improves the development of new materials, and optimizes manufacturing processes. In addition, DMA can detect changes in structure and composition, helping to identify defects and ensure product quality.
DMA is applicable to a wide range of materials, including polymers, composites, metals, ceramics, and biological materials. It is particularly useful for viscoelastic materials such as plastics and elastomers, but can also be used to study the mechanical properties of thin films, coatings, and adhesives. DMA's flexibility makes it possible to adapt tests to different sample shapes and sizes.
DMA results provide detailed information about the mechanical and thermal properties of materials, which is useful for product development. They make it possible to select the appropriate materials for specific applications, optimize material formulations, and improve manufacturing processes. In addition, by identifying thermal transitions and deformation behavior, industries can design more durable, higher-performing products that better meet market requirements.
What are the benefits of DMA analysis for polymer studies?
DMA analysis is essential for studying polymers because it enables precise measurement of their viscoelastic properties, such as stiffness, energy dissipation capacity, and glass transition.
It helps explain how polymers behave under various service conditions, supporting the development of new materials and the optimization of formulations. In addition, DMA can detect changes in structure and composition, thereby helping improve the performance and durability of polymer products.
"DMA Analyse Kunststoffe" translates as "DMA analysis of plastics" in English. It refers to the use of Dynamic Mechanical Analysis (DMA) to study the mechanical and thermal properties of plastic materials.
Dynamic mechanical analysis (DMA) and thermomechanical analysis (TMA) are two complementary techniques used to characterize the mechanical properties of materials.
DMA measures viscoelastic properties in response to an oscillating stress, making it possible to determine the storage and loss moduli, as well as the dissipation factor, which is particularly useful for polymersand composites.
In contrast, TMA focuses on dimensional changes in materials in response to temperature variations under a constant load, measuring the coefficient of thermal expansion (CTE) and transition temperatures such as the glass transition and melting point.
While DMA excels at studying viscoelastic behavior and phase transitions, TMA is ideal for analyzing thermal expansion and thermal creep behavior.
Storage modulus (G') : Measures a material's ability to store elastic energy when deformed, indicating its stiffness.
Example: In the polymer industry, the storage modulus is used to evaluate the stiffness of elastomers used in tires.
Loss modulus (G'') : Measures a material's ability to dissipate energy as heat, reflecting its viscoelastic behavior.
Example: In the manufacture of adhesive coatings, the loss modulus is analyzed to determine resistance to flow at high temperatures.
Loss factor (tan δ) : The ratio of the loss modulus to the storage modulus, indicating the relationship between a material's viscous and elastic behavior.
Example: In the composites industry, the loss factor is measured to optimize the performance of materials exposed to vibrations.
- Measurement of the glass transition temperature (Tg) : Identifies the temperature at which the material changes from a rigid state to a more flexible state. Example: In food packaging, the glass transition temperature of plastic films is monitored to ensure good flexibility at different temperatures.
- Temperature sweep analysis (TTS) : Studies a material's mechanical properties over a wide temperature range to observe phase transitions and changes in mechanical behavior. Example: In the medical device industry, TTS analysis is used to assess the thermal stability of polymeric materials used in implants.
- Thermal stability assessment : Measures the degradation of mechanical properties as temperature rises, which is critical for high-temperature applications.
- Monitoring phase transitions (melting, recrystallization) : Analyzes changes in the structure of materials as a function of temperature to optimize their use in thermally demanding environments.
- Strain rate dependence analysis : Studies how materials behave when subjected to different strain rates, which is essential for industrial applications involving rapid loading.
- Study of viscoelastic behavior at different loading rates : Provides an understanding of how materials dampen or transmit forces at various rates, particularly for components subjected to impacts or vibrations.
- Stress relaxation as a function of strain rate : Measures a material's ability to relax after being subjected to rapid deformation, which is useful in high-speed forming processes such as injection molding.
- Frequency dependence analysis: Explores the mechanical behavior of materials under stresses at different frequencies, for components subjected to vibrations or cyclic loads.
Example: In the automotive industry, this analysis is used to assess the resistance of suspension components, which must withstand vibrations at different frequencies while driving. - Loss factor study (tan δ): Identifies the damping properties of materials and their ability to dissipate vibrational energy at various frequencies.
Example: In electronic equipment, studying the loss factor is essential for selecting materials that minimize vibrations and interference at specific frequencies, such as in printed circuit boards and enclosures. - High-frequency dynamic fatigue assessment: Analyzes the resistance of materials under high-frequency load cycles, which is important for predicting the fatigue life of parts subjected to constant vibrations.
Example: In the aerospace industry, this analysis is used to assess the durability of composite parts exposed to high-frequency vibrations, such as helicopter blades or jet engine components.
