Project name Development of components life assessment procedures
Senior researcher Damir Jelaska
Institution of employment University of Split, Faculty of Electrical Engineering, Mechanical Engineering a...
Program name Properties Optimization of Mechanical Devices for Innovative Applications
Scientific area technical science
Peer review group Mechanical Engineering;Shipbuilding;Traffic Technology and Transportation;Aeronautics and Space Technology
Summary There are many influnces on components life, and one can sort them in a
three basic influences:
- The influence of material and shap of the component. The influnces of
the stress and strain concentrations belong here.
- The influence of loading, it is their history. The influences of time
character of loading (static, dynamic, stationary, nonstationary,
random), mean stress and multiaxial state of stresses belong here.
- The influence of enviroment, firstly of the temperature and
Any of those influences is adequately investigated in itself, So,
timely variable stresses cause the material fatigue, the elevated
temperature causes the creep of material, the timely variable
temperature causes the heat fatigue, the stress concentration causes the
cyclic accumulation of plastic starins leading to crack initiation,
etc. However, jointly acting of two or more influences is
insufficiently investigated, or is not at all. That is why the goals of
this investigations are as follow:
- For defined vibrations of turbo-engines disks and blades, it is for
combined HCF and LCF loading at elevated temperatures, find the method
for reliable determining their fatigue life.
- Find the method to determine the (residual) fatigue life of the
damaged structures subjected to random loading at elevated temperatures.
- Develop the numericl model for determining the fatigue life of
multiaxialy stressed elements subjected to elevated temperatures and
- Describe the procedure of determining the crack path in the gear tooth
root (bending) and at gear flanks (contact stresses), and the
calculation procedure of the corresponding fatigue lives of the involute
gears loaded by stress spectrum.
- Determine the reliability of this estimations, it is determine the
expectation and standard deviation of fatigue life on the basis of the
expectations and standard deviations of the input data.
Therefrom follows the basic hypothesis that this project intends to
prove: By means of numerical tools and those of Fracture mechanics, and
Service strength methods, it is possible to build the expert system
which will enable the reliable determining the component life on the
basis of defined material, shape and arbitrary stress history acting at
it's critical area in defined enviroment (temperature, corrosion).
We expect to reach the goals of the investigation and to prove the
Key words |Stress History|Fatigue,Fracture Mechanics,Operational Strength,Numerical Modelling,Involute Gear
Contract from 2.1.2007
Croatian scientific bibliography http://bib.irb.hr/lista-radova?sif_proj=023-0692195-1749&print=true&lang=EN
|Project assistants |
| Name and Surname || Status |
|Damir Jelaska ||Project leader |
|Srđan Podrug ||Researcher |
|Danko Radica ||Scientific novice |
|Nenad Vulić ||Researcher |