Abstract
To examine the applicability of methods proposed in the estimation of fatigue damage and fatigue life of components under random loading, a batch of specimens made of 7075-T651 aluminium alloy has been studied and some of the results are reported in the present paper. The paper describes different methods and rules in the calculation of fatigue damage, especially when random loading is considered. The methods and rules are then verified by the results of a series of low-cycle fatigue tests. It is concluded that a ‘plastic work interaction damage rule’ proposed by Morrow gives us better fatigue damage prediction than the widely used Palmgren-Miner rule, and a formula derived in random vibration books can be used to predict the fatigue damage very easily. It is also found that fatigue lives of the tested specimens can be fitted appropriately by normal or log-normal probability density function. The fatigue reliability of a component made of the same material can therefore be estimated based on the above information.
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