Hybrid Test Setup for Investigating Scaling Effects of High-Cycle and Low-Cycle Fatigue Interaction on Fatigue Damage Progression of Composites
Abstract
Most of the composite fatigue studies are conducted in low cycle fatigue (LCF) range withrelatively high stress/strain levels. Due to the high fatigue endurance limit of composites, thelow stress/strain level regime that corresponds to high cycle fatigue (HCF) is not explored.However, with the increase in composite usage in rotorcrafts, engines, wind turbines, and railways, there is a great need for understanding the composite fatigue behavior in HCF regime andthe interaction of HCF and LCF during overall damage progression, especially for matrixdominantfailure modes. There have been various fatigue studies conducted on metals tounderstand the HCF- LCF interaction. Various studies have indicated mixed results related tothe interaction between LCF- and HCF-induced damages. Due to the differences in loadingmechanisms required for LCF and HCF testing, a limited number of studies are conducted onhybrid test configuration, where both LCF and HCF loads are applied to the same test specimenin order to investigate the influence on each other. The primary goal of this research is todevelop a hybrid test methodology for investigating the interaction of HCF-LCF on damagegrowth of composites. The hybrid test methodology will be further interrogated for scalingeffects as well as for damage growth from manufacturing and foreign object impact damages.The focus of this research will be placed on composites, but the overall approach would beapplicable for metals as well. Various future DoD rotorcraft and engine applications can benefitfrom the findings as well as the development of the hybrid test setup that interrogate the HCFLCFinteraction on fatigue damage. Since this is not a well-explored area, researchers andstudents can gain an in-depth understanding of the challenges related to this topic and candevelop future DoD research proposals.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 04, 2017
- Source ID
- N000141712064
Entities
People
- Waruna Seneviratne
Organizations
- Office of Naval Research
- United States Navy
- Wichita State University