Publication detail

Fatigue and Crack Propagation Calculations of Wing Spar Structure

AUGUSTIN, P.

Czech title

Výpočty životnosti a šíření únavové trhliny v konstrukci nosníku křídla

English title

Fatigue and Crack Propagation Calculations of Wing Spar Structure

Type

journal article - other

Language

en

Original abstract

The main goal of this paper is to summarize present experiences obtained with MSC.Fatigue software. This FEM based package is intended for solution of a wide range of fatigue tasks and is made up of several analysis modules. Two of them will be described in more detail here. Calculations of the safe life of a wing spar using FEFAT module are presented. Comparison with results obtained by means of in-house developed program MINER is also done. The second task deals with the crack propagation analysis using PCRACK module that is an essential part of the damage tolerance evaluation. As a tool for verification of calculated crack propagation curves the widespread fracture mechanics software NASGRO was chosen. Investigated structure is represented by the wing spar specimen previously tested in the laboratory of Institute of Aerospace Engineering. Load history expected in calculations is identical with a load sequence applied during the flight-simulation fatigue test that was done using flight-by-flight methodology with random application of loads.

Czech abstract

Příspěvek shrnuje dosavadní zkušenosti z použití programového systému MSC.Fatigue. Program využívá výsledků napěťové analýzy MKP a je určen pro řešení širšího spektra problémů životnosti. Konkrétně je popsáno vyžití dvou jeho modulů. Uvedeny jsou výpočty bezpečné životnosti nosníku křídla (safe life) s využitím modulu FEFAT a je provedeno srovnávání s výsledky získanými pomocí vlastního programu MINER. Druhou řešenou problematikou jsou výpočty šíření trhliny pomocí modulu PCRACK (pro koncepci životnosti damage tolerance). Je provedeno srovnání získaných růstových křivek trhlin, a to s rozšířeným programem NASGRO. Analyzovanou konstrukcí je nosník křídla dopravního letounu zkoušený na zkušebně Leteckého ústavu. Průběh zatížení je totožný se zatěžovací sekvencí pro únavovou zkoušku, která byla prováděna metodou let za letem s náhodným pořadím vrcholů zatížení.

English abstract

The main goal of this paper is to summarize present experiences obtained with MSC.Fatigue software. This FEM based package is intended for solution of a wide range of fatigue tasks and is made up of several analysis modules. Two of them will be described in more detail here. Calculations of the safe life of a wing spar using FEFAT module are presented. Comparison with results obtained by means of in-house developed program MINER is also done. The second task deals with the crack propagation analysis using PCRACK module that is an essential part of the damage tolerance evaluation. As a tool for verification of calculated crack propagation curves the widespread fracture mechanics software NASGRO was chosen. Investigated structure is represented by the wing spar specimen previously tested in the laboratory of Institute of Aerospace Engineering. Load history expected in calculations is identical with a load sequence applied during the flight-simulation fatigue test that was done using flight-by-flight methodology with random application of loads.

Keywords in Czech

MSC.Fatigue

Keywords in English

MSC.Fatigue

RIV year

2004

Released

01.01.2004

ISSN

1211-877X

Journal

Letecký zpravodaj

Volume

2004

Number

3

Pages count

4

BIBTEX


@article{BUT42411,
  author="Petr {Augustin},
  title="Fatigue and Crack Propagation Calculations of Wing Spar Structure",
  journal="Letecký zpravodaj ",
  year="2004",
  volume="2004",
  number="3",
  month="January",
  issn="1211-877X"
}