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The present paper is concerned with the formulation of an elasto-plastic strain based approach\udsuitable for assessing fatigue strength of notched components subjected to in-service variable amplitude cyclic\udloading. The hypothesis is formed that the crack initiation plane is closely aligned with the plane of maximum\udshear strain amplitude, its orientation and the associated stress/strain quantities being determined using the\udMaximum Variance Method. Fatigue damage is estimated by applying the Modified Manson-Coffin Curve\udMethod (MMCCM) along with the Point Method (PM). In the proposed approach, the required critical distance\udis treated as a material property whose value is not affected either by the sharpness of the notch being assessed\udor by the profile of the load spectrum being applied. The detrimental effect of non-zero mean stresses and\uddegree of multiaxiality of the local stress/strain histories is also considered. The accuracy and reliability of the\udproposed design methodology was checked against several experimental data taken from the literature and\udgenerated under different uniaxial variable amplitude load histories. In order to determine the required local\udstress/strain states, refined elasto-plastic finite element models were solved using commercial software\udANSYS®. This preliminary validation exercise allowed us to prove that the proposed approach is capable of\udestimates laying within an error factor of about 2. These preliminary results are certainly promising, strongly\udsupporting the idea that the proposed design strategy can successfully be used to assess the fatigue lifetime of\udnotched metallic components subjected to in-service multiaxial variable amplitude loading sequences

An elasto-plastic approach to estimate lifetime of notched components under variable amplitude fatigue loading: a preliminary investigation