Причина такого успеха — уникальная конструкция прибора, включающая в себя высокоточный контроль нагрузки с использованием бесконтактного линейного двигателя, поддержку вала нагружающего элемента воздушными подшипниками что практически исключает трение и измерение смещения оптическим кодером с высоким разрешением. Благодаря такой конструкции прибор легко превосходит многие приборы других производителей по техническим характеристикам и качеству аналитических данных. Такое сочетание элементов позволяет уменьшить возникающее в приборе трение до чрезвычайно малых величин и работать с веществами при очень малых нагрузках, в большом диапазоне линейного перемещения до мкм , которое определяется оптическим элементом с разрешением 1 нм. ДМА Q представляет собой исследовательский прибор способный работать как динамический механический и термомеханический анализатор в различных режимах деформации сжатие, растяжение, изгиб по двум и трем точкам, пенетрация, сдвиг, сжатие в жидкости, растяжение в жидкости и с использованием различных газовых сред, температур и режимов нагружения.

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Low Friction? Sample: PC; 50mm x Storage Modulus GPa 8. All materials change in shape, volume, or both under the influence of an applied stress. The Modulus measures the resistance to deformation of a material when an external force is applied. We can define three kinds of Moduli for a material? Shear Modulus Modulus of Rigidity G? Examples of constant volume materials are liquids and ideal rubbers. Elastic Isotropic materials are materials in which properties at a point are the same in all directions.

Some examples of isotropic materials are unoriented amorphous polymers and annealed glasses [1]. If any of the two elastic constants of a homogenous in which properties do not vary from point to point isotropic material, the other two may be calculated [2].

Hayden, H. Nielsen, Lawrence E. Anisotropic Materials? Examples include fibers, wood, oriented amorphous polymers, injection molded specimens, fiber-filled composites, single crystals, and crystalline polymers in which the crystalline phase is not randomly oriented. Thus, anisotropy materials are really much more common then isotropic ones. Have more than two independent moduli - generally a minimum of 5 or 6. The number of independent moduli depends on the symmetry in the system.

Uniaxial Oriented Anisotropic Material? The figure below illustrates a simple anisotropic system known as uniaxial orthotropic. The lines in the figure could be taken as oriented segments of polymer chains or fibers in a composite material. In this example the fibers are randomly spaced as viewed from the end. This means the system has 5 independent elastic moduli. Top View. End View? B Side View? GTT EL? Bulk modulus? Transverse shear modulus?

Longitudinal shear modulus or GLT Figure: Uniaxial oriented anisotropic material with random line spacing and the five independent elastic moduli.

Basic Parameters and Units? DMA deforms a sample mechanically and measures the response? Response to deformation monitored as function of temperature, time, or frequency? The tangent of the phase angle is the ratio of the loss modulus to the storage modulus. Historically, DMAs and rheometers defined as controlled rate or controlled stress?

Today, most instruments can do both tests to a greater or lesser degree? Bending — Cantilever — 3-Point Bending? Low Friction Sample: PC; 50mm x Low Friction Sample: Steel; 50mm x MPa 2. Tan Delta 0. C increases significantly optimizing traction on a wet surface.

Cannot start, move, or measure. Cannot start or measure. Drive stopped. Drive stopped and run terminated. Remove clamp and repeat calibration.


Динамический механический анализатор TA Instruments DMA Q800

Real-time signals Test and instrument status at a glance The app-style touchscreen, powerful new TRIOS software, and quick robust calibration routines work seamlessly to dramatically improve laboratory workflows and productivity. The motor is constructed of high-performance lightweight composites that maximize axial and torsional stiffness while minimizing system inertia. This enables the system to capture a broad spectrum of material properties with the highest level of sensitivity and accuracy. Unlike competitive motor designs that provide either high force or high resolution, or require separate inferior motors for linear travel, the DMA achieves a continuous range of linear travel and high-resolution force measurement. Optimized Mechanics Optimized Mechanics The critical drive components of the DMA are mounted within a high-stiffness aluminum casting that is rigidly mounted to an FEA-optimized instrument frame. Competitive systems based on moveable, hanging, or soft-mounted frames are constrained in their effective frequency-range by the combination of sample stiffness and system resonance.


DMA Q800 – Analysis Quickstart




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