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Covariance between components of biaxial stress state in fatigue life calculations
Author(s) -
Lachowicz C. T.,
Łagoda T.,
Macha E.
Publication year - 1992
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19920230604
Subject(s) - covariance , structural engineering , tensor (intrinsic definition) , stress (linguistics) , cauchy stress tensor , aggregate (composite) , state (computer science) , basis (linear algebra) , finite element method , mathematics , engineering , materials science , mathematical analysis , statistics , algorithm , composite material , geometry , linguistics , philosophy
In this paper influence of correlalions between components of random stress tensor on the calculated fatigue life of the machine element has been analysed. Two groups of covariance matrices for components of biaxial stress state were considered. The first group was arbitrarily assumed and the second one was determined on the basis of the measured strains in the element of the vibrating screen for aggregate. Computer simulation was realized with four criteria of multiaxial random fatigue. Cycles were counted with the method of rain flow and damages were cumulated according to Palmgren‐Miner hypothesis. It has been shown that covariances between components of stress state tensor strongly influence the calculated fatigue life.