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The Latest at TRI

Fatigue Symposium Box Set Now Available

  • Writer: TRI Princeton
    TRI Princeton
  • 24 hours ago
  • 2 min read

Updated: 5 hours ago

The box set for the 2025 TRI Princeton Single Fiber Fatigue Symposium is now available as a box set of 8 lectures. Access is free to library subscribers and member companies.  Non-subscribers can purchase access for 12 months following a one-off payment of $50. 



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Dr Trefor Evans presenting at the Symposium 

This Symposium brought together scientists working in, or with interest in, this area to discuss and debate the various aspects of this approach, which over the past decade, has become the hottest new testing technique in the hair care industry. Single fiber fatigue testing often yields substantially larger differences between samples, in terms of breakage tendences, than those obtained by traditional tensile testing. It also highlights the sizable contribution of previously unrecognized factors and considerations to the breakage process, which can be used to derive potential new strategies for breakage avoidance. It’s already possible to see fatigue data being used in product and ingredient claims communications.  

The box set contains all 8 lectures, with excellent speakers from a range of companies: 

  1. An Introduction to Single Fiber Fatigue Testing of Hair by Trefor Evans (TRI Princeton) 

  2. An Introduction to Survival Analysis With Applications in Fatigue Testing of Hair by Lynsel McColl (Select Statistics, UK) 

  3. Cyclic Fatigue Measurements in the Cosmetics Industry: How to Measure it and What It Tells Us by Rebecca Lunn (Dia-stron, UK) 

  4. Fatigue Failure Behavior of Hair From Different Geographic Regions in Strain-Controlled Experiments by Jessica Wilzel (Henkel) 

  5. From Science to Disruptive Hair Repair Consumer-Perceived Innovation Technology by Nawel Baghdadli, Gaël Robert and Liam-Henry Tan (L’Oréal, France) 

  6. New Insights From Fatigue Measurements of Customer Hair and Correlation with Other Damage Measures by Jennifer Marsh (The Procter and Gamble Company, USA) 

  7. The Science of the Fatigue to Hair Fibers by Anthony Bunsell  

  8. Where do we go From Here? And Roundtable Discussion by Trefor Evans (TRI Princeton) 

For information about becoming a Member Company – where you directly support the TRI program of advanced research, education, and dissemination of scientific information – please visit our webpage

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