Cycle-based analysis of damage and failure in advanced composites under fatigue

1. Experimental observation of damage development within loading cycles

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34 Citations (Scopus)

Abstract

Damage development within loading cycles and the possibility of cycle-based modeling of fatigue damage evolution and failure in advanced composites are addressed in this work. In Part 1 of the work, the fatigue damage development in an unnotched composite laminate is studied by an advanced acoustic emission (AE) technique. The overall time history of the acoustic emission is recorded and separated into the emission from loading and unloading phases of the loading cycles. The source location histories and distributions of the AE events over the fatigue stress range are extracted and analyzed. Qualitatively different time histories and stress distributions for the emission generated during loading and unloading are observed and analyzed, for the first time. It is concluded that most of the emission from the unloading phase is due to internal friction between the crack faces and most of the damage is developed during the loading phase of the cycles. The location distribution of the fatigue damage is found to be fairly random to failure, indicating that the dominating fatigue fracture process in an unnotched laminate is scattered damage nucleation and accumulation. The time history of the overall damage evolution is found to exhibit the classical initial, steady, and final failure development stages. Within the loading cycles, the damage is developed over the entire stress range, with the substantial amount developed at stresses below the maximum fatigue stress. The latter observation sheds light on the reported effects of the loading cycle shape on the fatigue behavior and life of composites. The results of this study provide an insight into fatigue damage development in composites and constitute a fundamental basis for the development of a cycle-based model in Part 2 of this work.

Original languageEnglish (US)
Pages (from-to)499-510
Number of pages12
JournalInternational Journal of Fatigue
Volume25
Issue number6
DOIs
StatePublished - Jun 1 2003

Fingerprint

Fatigue damage
Fatigue
Damage
Acoustic emissions
Unloading
Composite
Fatigue of materials
Fatigue Damage
Cycle
Composite materials
Acoustic Emission
Laminates
Internal friction
Stress concentration
Nucleation
Composite Laminates
Cracks
Stress Distribution
Observation
Range of data

Keywords

  • Advanced acoustic emission analysis
  • Advanced composites
  • Experimental analysis
  • Fatigue damage

ASJC Scopus subject areas

  • Modeling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Cite this

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title = "Cycle-based analysis of damage and failure in advanced composites under fatigue: 1. Experimental observation of damage development within loading cycles",
abstract = "Damage development within loading cycles and the possibility of cycle-based modeling of fatigue damage evolution and failure in advanced composites are addressed in this work. In Part 1 of the work, the fatigue damage development in an unnotched composite laminate is studied by an advanced acoustic emission (AE) technique. The overall time history of the acoustic emission is recorded and separated into the emission from loading and unloading phases of the loading cycles. The source location histories and distributions of the AE events over the fatigue stress range are extracted and analyzed. Qualitatively different time histories and stress distributions for the emission generated during loading and unloading are observed and analyzed, for the first time. It is concluded that most of the emission from the unloading phase is due to internal friction between the crack faces and most of the damage is developed during the loading phase of the cycles. The location distribution of the fatigue damage is found to be fairly random to failure, indicating that the dominating fatigue fracture process in an unnotched laminate is scattered damage nucleation and accumulation. The time history of the overall damage evolution is found to exhibit the classical initial, steady, and final failure development stages. Within the loading cycles, the damage is developed over the entire stress range, with the substantial amount developed at stresses below the maximum fatigue stress. The latter observation sheds light on the reported effects of the loading cycle shape on the fatigue behavior and life of composites. The results of this study provide an insight into fatigue damage development in composites and constitute a fundamental basis for the development of a cycle-based model in Part 2 of this work.",
keywords = "Advanced acoustic emission analysis, Advanced composites, Experimental analysis, Fatigue damage",
author = "Yuris Dzenis",
year = "2003",
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N2 - Damage development within loading cycles and the possibility of cycle-based modeling of fatigue damage evolution and failure in advanced composites are addressed in this work. In Part 1 of the work, the fatigue damage development in an unnotched composite laminate is studied by an advanced acoustic emission (AE) technique. The overall time history of the acoustic emission is recorded and separated into the emission from loading and unloading phases of the loading cycles. The source location histories and distributions of the AE events over the fatigue stress range are extracted and analyzed. Qualitatively different time histories and stress distributions for the emission generated during loading and unloading are observed and analyzed, for the first time. It is concluded that most of the emission from the unloading phase is due to internal friction between the crack faces and most of the damage is developed during the loading phase of the cycles. The location distribution of the fatigue damage is found to be fairly random to failure, indicating that the dominating fatigue fracture process in an unnotched laminate is scattered damage nucleation and accumulation. The time history of the overall damage evolution is found to exhibit the classical initial, steady, and final failure development stages. Within the loading cycles, the damage is developed over the entire stress range, with the substantial amount developed at stresses below the maximum fatigue stress. The latter observation sheds light on the reported effects of the loading cycle shape on the fatigue behavior and life of composites. The results of this study provide an insight into fatigue damage development in composites and constitute a fundamental basis for the development of a cycle-based model in Part 2 of this work.

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