STRESS-BASED FATIGUE RELIABILITY ANALYSIS OF THE RAIL FASTENING SPRING CLIP UNDER TRAFFIC LOADS

Authors

  • SAEED MOHAMMADZADEH IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
  • SODAYF AHADI IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
  • MEHRDAD NOURI IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Keywords:

FASTENING SPRING CLIP, FATIGUE CRACK PREDICTION, RELIABILITY, FORM

Abstract

NOWADAYS, THE RAIL FASTENING SYSTEMS PLAY AN IMPORTANT ROLE FOR PRESERVING THE CONNECTION BETWEEN THE RAILS AND SLEEPERS IN VARIOUS CONDITIONS. IN THIS PAPER, STRESS BASED CONCEPT IS USED TO DEVELOP A COMPREHENSIVE APPROACH FOR FATIGUE RELIABILITY ANALYSIS OF FASTENING SPRING CLIP. AXLE LOAD, SPEED AND MATERIAL PROPERTIES ARE ASSUMED TO BE RANDOM VARIABLES. FIRST, TRACK AND TRAIN MODELS ARE ANALYZED DYNAMICALLY IN ORDER TO ACHIEVE DISPLACEMENT TIME HISTORY OF FASTENING SPRING CLIP. THEN THIS DISPLACEMENT TIME HISTORY IS APPLIED TO THE FASTENING SPRING CLIP IN FE SOFTWARE TO OBTAIN VARIABLE AMPLITUDE OF STRESSES. CRACK NUCLEATION LIFE IS CALCULATED BY RAIN-FLOW METHOD AND PALMGREN-MINER LINEAR DAMAGE RULE. FIRST ORDER RELIABILITY METHOD (FORM) AND MONTE-CARLO SIMULATION TECHNIQUE ARE EMPLOYED FOR THE RELIABILITY INDEX ESTIMATIONS. THE INFLUENCES OF VARIOUS RANDOM VARIABLES ON THE PROBABILITY OF FAILURE ARE INVESTIGATED BY SENSITIVITY ANALYSIS. THE RESULTS SHOW THAT THE EQUIVALENT STRESS RANGE AND MATERIAL PARAMETER HAVE SIGNIFICANT EFFECT ON FATIGUE CRACK NUCLEATION.

Author Biographies

SAEED MOHAMMADZADEH, IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

DR.  SAEED MOHAMMADZADEH IS AN ASSISTANT PROFESSOR IN SCHOOL OF  RAILWAY ENGINEERING IN IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY. HE IS GRADUATED IN CIVIL ENGINEERING FROM SHARIF UNIVERSITY OF TECHNOLOGY (B.SC.) AND CONTINUED HIS UPPER GRADUATE STUDIES IN IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY (PHD).  MAIN KEY RESEARCH INTERESTS AND AREAS OF EXPERTISE ARE:

·OPTIMIZATION AND RELIABILITY ANALYSIS

·

· TEST AND EMPIRICAL ANALYSIS OF RAILWAY TRACK AND STRUCTURES

·MODELING THE BEHAVIOR AND DETERIORATION ANALYSIS

·MAINTENANCE AND REPAIRING MANAGEMENT

CONCLUDED RESEARCH AND INDUSTRIAL PROJECTS ARE MORE THAN 25 DURING THE LAST TEN YEARS. HIS DISSERTATION AND PUBLISHED PAPERS ARE MORE THAN 50 ISI, ISC PAPERS AND PROCEEDINGS. MOREOVER HE HAS PUBLISHED SIX BOOKS IN RAILWAY TRACK AND STRUCTURES FIELD.

DESIGN AND ANALYSIS OF RAILWAY TRACK AND STRUCTURES

SODAYF AHADI, IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

POSTGRADUATE STUDENT

MEHRDAD NOURI, IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

POSTGRADUATE STUDENT

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Published

2014-01-20

Issue

Vol. 11 No. 6 (2014)

Section

Articles

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