Material Testing Lab

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Material Testing Lab Laboratory-based material testing and characterization capabilities are the cornerstone of Stress Engineering Services’ plastics, rubber, and composites design and predictive analysis services. In our material testing lab we use a wide range of specialized tools to test and characterize the behavior of plastic and composite materials. Data is collected to establish material behaviors and determine which materials are appropriate to use, and when.

High Strain Rate Tensile Testing (HSRT)

This proprietary test machine, developed by SES, is capable of testing at rates on the order of 10,000% per second, capturing how stress, strain and ductility at failure are affected by high strain rate events, such as drop impact. Very early in the development process this test can be used to screen candidate materials for a particular design application, or to develop 'material models’ for predicting failure using non-linear finite element analysis methods. SES is unique in combining testing capabilities and predictive structural modeling.

Biaxial Tensile Testing (for film and thin materials)

Failures in most plastic products occur under multi-axial stress/strain states. The effect of this stress state is to reduce the ductility of the materials, which becomes the limiting load scenario for design. To collect data for this important material parameter, SES developed a Biaxial Tensile Test system, which captures the behavior of film and thin materials under biaxial tension. It is used to evaluate materials for drop impact applications and other high strain rate events.

Dynamic Mechanical Analyzer (DMA)

A DMA measures a wide variety of time- and temperature-dependent mechanical performance attributes on very small material samples. In our material testing lab the collected data can be combined through time-temperature super-positioning to create a master curve of material stiffness, which includes strain rates (both fast-drop impact or slow-creep) that are difficult to measure using other means. DMA Capabilities:
  • Measure creep, relaxation, and recovery
  • Has several loading modes: tension, compression, bending, and shear
  • Temperature range for measuring material properties: -145°C to 600°C
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