August EWJ 24 - Flipbook - Page 16
localized defects, and lower-than-projected material
properties are always something to keep in mind
when processing mistakes are suspected.
identifying the failure mode, pinpointing the root
cause, and suggesting corrective measures. Utilizing
apt investigative tools allows for root cause identification and corrective action recommendations. Various
investigative tools like spectroscopy (FTIR, GC-MS),
microscopy (optical, SEM), and mechanical testing are
widely used in failure analysis to scrutinize the material's composition, microstructure, and mechanical
properties. Together, the collective information aids in
preventing future failures while enhancing material
reliability and performance.
Material Installation
Lastly, even if everything associated with producing
the parts has been handled correctly, installation errors could wipe out all the good efforts leading up to
the final step of the project. Overtightening (or overtorquing) is the most common mistake encountered
in field failure of plastic parts. Installers who are accustomed to installing metal fittings tend to apply the
same rules in connecting plastic fittings, especially if
the installation involves a male metal component
threaded into a plastic female component. Failure at
thread bases of the plastic components is the most
observed field occurrence.
Has a recent catastrophe affected you?
Our experts are ready to help.
www.envistaforensics.com
About the author
Dr. Jack Huang is a Senior Scientist at Envista
Forensics with over 20 years of experience in product
liability, failure analysis, and process/application development for new polymer materials and composites
in the automotive and building products industries.
Another installation error involves accidental unintended exposure of plastic parts to detrimental chemicals. CPVC pipes coming into contact with anti-freeze
agents or moisture mediation agents containing
polyester or POE oil from heat exchangers are good
examples of this category.
To sum up, a comprehensive understanding of material failure hinges on a thorough knowledge of solid
mechanical principles, material characteristics, failure
features, and eventual mechanisms. Addressing a material failure case necessitates a systematic and meticulous process. This process generally includes
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+44 203 696 7996
The
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FORENSIC ENGINEERING
FAILURE ANALYSIS
FIRE INVESTIGATION
EXPERT WITNESS JOURNAL
14
AUGUST 2024
