Evaluation of fatigue damage parameters for Ni‐based super alloys Inconel 825 steel notched specimen using stochastic approach

Abstract

In the present investigation, temperature dependence fatigue strength behavior of Ni‐based Inconel 825 super alloys is investigated. Based on the experimental results, different S–N models have been derived and a suitable model for the prediction of fatigue strength has been proposed. An inverse power as well as exponential relation between the fatigue strength and absolute temperature is demonstrated. The proposed models are used to predict the fatigue life using the well‐known Palmgren–Miner rule. Based on high to low load steps and low to high load steps datasets under identical test conditions, the damage constant of Miner rule is stochastically modeled for fatigue life prediction. The statistical model is developed combining the probabilistic nature of Miner rule damage constant and stress–life–temperature relation. It is also validated through sets of experimental data and found to be useful in reliability‐based design.

Enhancing the Fatigue Design of Mechanical Systems Such as Refrigerator to Reserve Food in Agroindustry for the Circular Economy

“…Fatigue is the failure of a material that is frequently subjected to cyclic loading. Of particular concern is the failure of components during low-cycle fatigue, specifically in the area of turbine-engine that is composed of nickel-built polycrystalline matter [11,12]. It is also measured as a quantity element, such as the stress proportion, R (=σ min /σ max ), explained as the correlation of the greatest cyclic stress to the least cyclic stress [13].…”

Proposal of a Probabilistic Model on Rotating Bending Fatigue Property of a Bearing Steel in a Very High Cycle Regime

“…Since the scatter of the hardness is sufficiently small, the hardness of this steel was supposed to be constant for the sake of simplicity. Although some number of papers analyzing the statistical aspects of S-N property were published [14][15][16][17][18][19], the main target of those research is the statistical property within the usual life region, which is less than 10 7 cycles. Considering this point, the main aim of the present study was set to the physical interpretation of the statistical aspects of the S-N characteristics of a bearing steel, in the very high cycle regime.…”