Various parameters of the multiaxial variable amplitude loading and their effect on fatigue life and fatigue life computation

Abstract

The paper discusses various partial solutions used for estimating fatigue life under variable amplitude multiaxial loading in the high‐cycle fatigue domain. The concurring effects are treated, and their proposed solutions are commented upon. The major focus is on the categories of the phase shift effect and of cycle counting and on the scope and quality of data, which support discussed theories. Results of own new experimental data set on specimens from S355 steel are provided. Fatigue life estimates for McDiarmid and Findley multiaxial methods and for two different methods of load path decomposition to cycles are shown to highlight some of the points open for discussion. It is concluded that the available experimental data are not sufficient to substantiate a clear decision to follow a definite algorithm.

Fatigue life prediction model of toughness dissipation energy based on small load correction

“…These nonlinear models can take into account the loading history of variable amplitude loads to a certain extent, and the prediction results are all better than those of linear damage models. However, the nonlinear fatigue accumulation damage model still has too many forms of expression, and so far, there still needs to be a proven method model [9][10][11] . Most of the current stage of nonlinear fatigue accumulation damage model only consider the structure under constant amplitude load, without considering the impact of variable amplitude load loading history on fatigue life, resulting in its assessment accuracy is not high; a few assessment methods, although the impact of the loading history is considered, its complex form of expression also requires a large number of test support, it is difficult to apply directly to engineering practice, so there is an urgent need for a set of effective fatigue life assessment system of welded structures [12][13][14] .…”

Virtual special issue: Variable amplitude loading—Fracture mechanics and cumulative damage modeling

“…Papuga et al 9 gave an overview on multiaxial fatigue approaches and related problems with regard to variable amplitude loading limiting themselves to HCF. They argued that a multitude of effects would be relevant that have to be understood and assessed separately, but equally important with regard to their synergistic interaction.…”