WEBINAR: Fractography in Plastics Failures

September 10, 2020 at 11:00AM–NOON EST
Webinar via Zoom

 

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Summary

The goal of a failure analysis is to discern the mechanism and cause of the component failure - essentially to identify how and why the part broke. Fractography plays critical role in this, particularly in identifying the failure mode. Cracking occurs as a result of the exertion of stresses, both external and internal, on a component. Cracking is simply a stress relief mechanism in which the material is attempting to reach a lower energy state. Plastics fail through a disentanglement mechanism in which polymer chains slide past each other.

The features on the fracture surface are created based upon a number of parameters:

  • Type of material and formulation constituents;
  • Type of applied forces (tensile, compression, shear);
  • Magnitude of forces;
  • Frequency of forces (continuous, intermittent, rapidly applied);
  • Environmental effects (temperature, presence of chemical).

Much of the information regarding the failure mechanism can be gleaned by interpreting the features found on the fracture surface. The examination and interpretation of the fracture surface is known as fractography. This presentation will explore some common plastics failure mechanisms and the associated telltale features.

About Speaker

Jeffrey A. Jansen is the Engineering Manager and a Partner at The Madison Group, an independent plastics engineering and consulting firm. Jeff specializes in failure analysis, material selection, as well as compatibility, aging, and lifetime prediction studies for thermoplastic materials. He has more than 30 years of experience solving problems and addressing opportunities related to polymeric materials. In that time, he has performed over 5,000 investigations, both for industrial clients and as a part of litigation. Jeff is a regular presenter on the SPE webinar series, covering a wide range of topics related to plastics failure, material performance, testing, and polymer technology. Jeff is a graduate of Carroll College and the Milwaukee School of Engineering.

This educational program is provided as a service of SPE. The views and opinions expressed on this or any SPE educational program are those of the Speaker(s) and/or the persons appearing with the Speaker(s) and do not necessarily reflect the views and opinions of Society of Plastics Engineers, Inc. (SPE) or its officials, employees or designees. To comment or to present an opposing or supporting opinion, please contact us at info@4SPE.org.




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