T. Itoh M. Sakane T. Morishita


This paper presents a simple method of determining stresses and strains and a severity of loading history under non-proportional loadings with defining the rotation angles of the maximum principal stress and strain in a three dimensional stress and strain space. Based on the method, non-proportional stress and strain ranges are derived and applicability of the range to the life evaluation for low carbon steel under non-proportional random strain paths are discussed. The strain range taking account of intensity of loading path reducing life can be suitable parameter for multiaxial fatigue life evaluation under multiaxial non-proportional loading. This paper also shows a method of visually presenting the principal stress and strain that assists designers to understand the loading mode whether proportional or non-proportional under 3 dimensional (6 stress/strain components) multiaxial loading.


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    How to Cite

    Itoh, T., Sakane, M. and Morishita, T. (2015) “Evaluation and visualization of multiaxial stress and strain states under non-proportional loading”, Frattura ed Integrità Strutturale, 9(33), pp. pages 289–301. doi: 10.3221/IGF-ESIS.33.33.