Influence of spectrum loading sequences on fatigue life in a high-temperature environment

K. A. Zakaria, Shahrum Abdullah, Mariyam Jameelah Ghazali, Che Husna Azhari

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

This paper discusses the fatigue life behaviour of aluminium alloy AA6061-T6 under spectrum loadings. Load sequences in spectrum loadings can have significant effects on fatigue life at room temperature and within the elevated temperature range. The main objective of this paper is to investigate the influences of load sequences effect on fatigue life at elevated temperature. Fatigue strain signal was obtained from the engine mount bracket of an automobile under normal driving conditions. Constant amplitude loading, high-to-low, and low-to-high loading sequences were then derived from the original fatigue strain signal to observe the fatigue behaviour at both room and elevated temperatures. The fatigue test was performed on AA6061-T6 specimen according to the ASTM E466 standard using a 100. kN servo-hydraulic fatigue testing machine within the temperature range of 27-250. °C. The elevated temperature range was chosen based on the maximum temperature of the engine mount bracket and the extreme temperature of the cylinder head that can be reached in service. After the test, fatigue fracture surfaces were sectioned and inspected using a high-magnification microscope. Results show that fatigue life behaviour at room temperature was significantly influenced by the load sequences in spectrum loadings. On the other hand, the effect of load sequences at a higher temperature was reduced.

Original languageEnglish
Pages (from-to)111-123
Number of pages13
JournalEngineering Failure Analysis
Volume30
DOIs
Publication statusPublished - Jun 2013

Fingerprint

Fatigue of materials
Temperature
Engines
Cylinder heads
Fatigue testing
Automobiles
Aluminum alloys
Microscopes
Hydraulics

Keywords

  • Elevated temperature
  • Fatigue behaviour
  • Load sequence
  • Spectrum loadings

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Mechanical Engineering
  • Mechanics of Materials
  • Aerospace Engineering
  • Automotive Engineering
  • Industrial and Manufacturing Engineering

Cite this

Influence of spectrum loading sequences on fatigue life in a high-temperature environment. / Zakaria, K. A.; Abdullah, Shahrum; Ghazali, Mariyam Jameelah; Azhari, Che Husna.

In: Engineering Failure Analysis, Vol. 30, 06.2013, p. 111-123.

Research output: Contribution to journalArticle

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