PROBABILITY ANALYSIS IN DETERMINING THE BEHAVIOUR OF VARIABLE AMPLITUDE STRAIN SIGNAL BASED ON EXTRACTION SEGMENTS

Authors

  • MOHD FARIDZ MOD YUNOH UNIVERSITI KEBANGSAAN MALAYSIA
  • SHAHRUM ABDULLAH UNIVERSITI KEBANGSAAN MALAYSIA
  • MOHAMAD HANIF MD SAAD UNIVERSITI KEBANGSAAN MALAYSIA
  • ZULKIFLI MOHD NOPIAH UNIVERSITI KEBANGSAAN MALAYSIA
  • MOHD ZAKI NUAWI UNIVERSITI KEBANGSAAN MALAYSIA

Keywords:

FATIGUE, STRAIN SIGNAL, WEIBULL DISTRIBUTION

Abstract

THIS PAPER FOCUSES ON ANALYSIS IN DETERMINING THE BEHAVIOUR OF VARIABLE AMPLITUDE STRAIN SIGNALS BASED ON EXTRACTION OF SEGMENTS. THE CONSTANT LOADING (CAL), THAT WAS USED IN THE LABORATORY TESTS, WAS DESIGNED ACCORDING TO THE VARIABLE AMPLITUDE LOADING (VAL) FROM SOCIETY OF ENGINEER (SAE). THE SAE STRAIN SIGNAL WAS THEN EDITED TO OBTAIN THOSE SEGMENTS THAT CAUSE FATIGUE DAMAGE TO COMPONENTS. THE SEGMENTS WERE THEN SORTED ACCORDING TO THEIR AMPLITUDE AND WERE USED AS A REFERENCE IN THE DESIGN OF THE CAL LOADING FOR THE LABORATORY TESTS. THE STRAIN SIGNALS THAT WERE OBTAINED FROM THE LABORATORY TESTS WERE THEN ANALYSED USING FATIGUE LIFE PREDICTION APPROACH AND STATISTICS, I.E. WEIBULL DISTRIBUTION ANALYSIS. BASED ON THE PLOTS OF THE PROBABILITY DENSITY FUNCTION (PDF), CUMULATIVE DISTRIBUTION FUNCTION (CDF) AND THE PROBABILITY OF FAILURE IN THE WEIBULL DISTRIBUTION ANALYSIS, IT WAS SHOWN THAT MORE THAN 70% FAILURE OCCURRED WHEN THE NUMBER OF CYCLES APPROACHED 1.0 X 1011. THEREFORE, THE WEIBULL DISTRIBUTION ANALYSIS CAN BE USED AS AN ALTERNATIVE TO PREDICT THE FAILURE PROBABILITY.

Author Biographies

MOHD FARIDZ MOD YUNOH, UNIVERSITI KEBANGSAAN MALAYSIA

DEPARTMENT OF MECHANICAL & MATERIALS ENGINEERING,

FACULTY OF ENGINEERING & BUILT ENVIRONMENT,

UNIVERSITI KEBANGSAAN MALAYSIA,

43600 UKM BANGI,

SELANGOR,

MALAYSIA.

SHAHRUM ABDULLAH, UNIVERSITI KEBANGSAAN MALAYSIA

DEPARTMENT OF MECHANICAL & MATERIALS ENGINEERING,

FACULTY OF ENGINEERING & BUILT ENVIRONMENT,

UNIVERSITI KEBANGSAAN MALAYSIA,

43600 UKM BANGI,

SELANGOR,

MALAYSIA.

MOHAMAD HANIF MD SAAD, UNIVERSITI KEBANGSAAN MALAYSIA

DEPARTMENT OF MECHANICAL & MATERIALS ENGINEERING,

FACULTY OF ENGINEERING & BUILT ENVIRONMENT,

UNIVERSITI KEBANGSAAN MALAYSIA,

43600 UKM BANGI,

SELANGOR,

MALAYSIA.

ZULKIFLI MOHD NOPIAH, UNIVERSITI KEBANGSAAN MALAYSIA

DEPARTMENT OF MECHANICAL & MATERIALS ENGINEERING,

FACULTY OF ENGINEERING & BUILT ENVIRONMENT,

UNIVERSITI KEBANGSAAN MALAYSIA,

43600 UKM BANGI,

SELANGOR,

MALAYSIA.

MOHD ZAKI NUAWI, UNIVERSITI KEBANGSAAN MALAYSIA

DEPARTMENT OF MECHANICAL & MATERIALS ENGINEERING,

FACULTY OF ENGINEERING & BUILT ENVIRONMENT,

UNIVERSITI KEBANGSAAN MALAYSIA,

43600 UKM BANGI,

SELANGOR,

MALAYSIA.

Downloads

Published

2017-08-26

Issue

Vol. 14 No. 12 (2017)

Section

Articles

License

Authors who publish with this journal agree to the following terms:

 

  1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License [CC BY] that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
  2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
  3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).