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Research on Low-Cycle Fatigue Engineered Hybrid Sandwich Ski Construction
Tomáš Božák1, Miroslav Müller1, Viktor Kolář1
1Department of Material Science and Manufacturing Technology, Faculty of Engineering, Czech University of Life Sciences Prague, Kamycka 129, Suchdol, 165 00 Prague, Czech Republic.
Polymers
|June 10, 2022
Summary
This study assessed the low-cycle fatigue of a hybrid sandwich ski, finding no significant changes in mechanical properties or shape after 70,000 cycles. Minor delamination was observed between core and composite layers upon detailed analysis.
Area of Science:
- Materials Science
- Mechanical Engineering
- Sports Engineering
Background:
- Hybrid sandwich ski structures are increasingly used in modern designs.
- Understanding material fatigue is crucial for ensuring ski durability and performance.
- Cyclic loading during use can impact the structural integrity of ski components.
Purpose of the Study:
- To evaluate the effects of low-cycle fatigue on a novel hybrid sandwich ski structure.
- To determine changes in mechanical properties and structural integrity under simulated seasonal use.
- To assess the durability of individual layers within the ski composite.
Main Methods:
- Subjecting the hybrid sandwich ski to 70,000 deflection cycles.
- Measuring the force required for a 60 mm deflection throughout the test.
- Utilizing image analysis on cross-sections to detect delamination.
Main Results:
- No significant changes in ski shape or visual delamination were observed during cyclic loading.
- The average force for deflection remained relatively stable, with slight hardening observed after initial cycles.
- Image analysis revealed localized delamination between the wood core and composite layers (E-Glass/Carbon).
Conclusions:
- Low-cycle fatigue did not significantly degrade the overall mechanical properties or visual integrity of the hybrid sandwich ski.
- While macroscopically intact, microscopic analysis indicated potential interfacial weaknesses under cyclic stress.
- The ski design demonstrates resilience to fatigue, but interfacial durability warrants further investigation.
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