Testing and Simulation for Infinite Life Design - An Endurica Winning on Durability Webinar         


Friday, September 30, 2022 from 9:00 AM to 10:00 AM EDT
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Joe Suter 
Endurica LLC 

Winning on Durability - Testing and Simulation for Infinite Life Design 

A rubber compound’s intrinsic strength has great utility for rubber product developers:

  • By keeping tearing energy at all times below the intrinsic strength, a developer can assure indefinite life with minimum effort. 
  • Additionally, fatigue crack growth rate behavior can be rapidly approximated from knowledge of tear strength and intrinsic strength.
The intrinsic strength is measured using a cutting method developed originally by Lake and Yeoh, and implemented on the Coesfeld Intrinsic Strength Analyser. The method minimizes crack tip process zone viscoelastic dissipation, and therefore indicates the bare-minimum energy required to propagate a crack by breaking polymer chains.
The intrinsic strength can be utilized in combination with critical plane analysis to compute a worst-case safety factor relative to the fatigue limit. Several examples will be presented, including:
  • a grommet sizing application
  • a tire belt compounding application
  • a squeeze pump hose
In each example, simulation is used to compute the fraction of loading reserve (ie safety factor) relative to the experimentally determined intrinsic strength.

Your presenter is Endurica's founder and president, Dr. Will Mars. An international leader in the failure mechanics of rubber and elastomers, Dr. Mars has received numerous awards for his scientific contributions, is the author or co-author of 50+ peer-reviewed publications and holds four patents. His expertise spans what he calls the "special effects" of rubber and elastomers in material characterization, product evaluation, constitutive modeling, crack nucleation, fracture mechanics, and fatigue life prediction methods.

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