Volume 19.3

Digital Image Correlation Techniques Enhance Composite Testing Capability  
Datapoint Newsletter v19.3 panel image

As the use of structured composite materials continues to increase, particularly in the aerospace and automotive industries, DatapointLabs has developed enhanced test methods to capture shear properties and calibrate anisotropic material models to better represent the behavior of these complex materials.

Further, we are now applying digital image correlation (DIC) techniques in combination with these more conventional methods to measure directional properties of structured composites in order to populate linear orthotropic material models for use in Abaqus, ANSYS, NASTRAN and other structural analysis codes. True stress-strain measurements (ASTM D638/E8) can be performed using 3D DIC techniques, and the resulting data can be post-processed to obtain true stress-strain behavior, including localized yielding and subsequent failure. This is described in more detail in a recently presented paper at the NAFEMS World Congress 2013 in Salzburg, Austria.

Our Test Catalog has a range of tests that can be applied to composite materials, including Iosipescu (ASTM D5379), Arcan, and other shear methods; four-point bending (ASTM D6272); bearing strength (ASTM D5961); and open-hole tensile (ASTM D5766) and compressive (ASTM D6484) measurements.

In addition, we have added two new Testpaks to make it easy to to request the composite material properties required for specific Abaqus and LS-DYNA material models.

Store and Manage Properties of Structured Composites with a Matereality® Database

The most recent update to Matereality software has expanded material information storage capabilities on its extensible framework to store the composition and makeup of the material for which properties have been tested. For structured composite materials, this means that layup details, including orientation and thickness, as well as individual layer mechanical properties, now can be stored and managed in your Matereality database.

Compositional details of this kind can be captured even for non-conventional composites, such as metal-polymer composites and headliner materials.

See the Matereality Service Bulletin for details.

Latest Developments Presented at Recent Industry Events

Find links to these and previous technical papers and presentations for reference on our Research Papers page.

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