Sequential law in multiaxial fatigue, a new damage indicator

Fatigue behavior of X70 microalloyed steel after severe shot peening

Fatigue life prediction of materials can be modeled by deterministic relations, via mean or median S-N curve approximation. However, in engineering design, it is essential to consider the influence...

https://journals.sagepub.com/doi/pdf/10.1177/1687814019870395

Probabilistic S-N fields based on statistical distributions applied to metallic and composite materials: State of the art:

S-N behavior has been a backbone of material fatigue life studies since the 19th century. Numerous S-N curve models have been produced but they have been arbitrarily chosen in numerous research works dominantly for composite materials. In this paper, they were critically reviewed and evaluated for capability using the following criteria: data fitting capability, efficiency of curve fitting, applicability to data sets at various stress ratios (−0.43, −1, −3, 0.1, and 10), representability of fatigue damage at failure, and satisfaction of the initial boundary condition. The S-N curve models were found to be in two categories—one for fatigue data characterization independent of stress ratio, and the other for those designed for predicting the effect of stress ratio. The models proposed by Weibull, Sendeckyj, and Kim and Zhang for fatigue data characterization appeared to have the best capabilities for experimental data obtained from Weibull for R = −1, from Sendeckyj for R = 0.1, and from Kawai and Itoh (for R = −0.43, −3, and 10). The Kim and Zhang model was found to have an advantage over the Weibull and the Sendeckyj models for representing the fatigue damage at failure. The Kohout and Vechet model was also found to have a good fitting capability but with an inherent limitation for shaping the S-N curve at some stress ratios (e.g., R = −0.43). The S-N curve models developed for predicting the effect of stress ratio were found to be relatively inferior in data fitting capability to those developed directly for fatigue data characterization.

S-N Curve Models for Composite Materials Characterisation: An Evaluative Review

https://cyberleninka.org/article/n/966159.pdf

Influence of plasma electrolytic oxidation on fatigue performance of AZ61 magnesium alloy

A new function for fatigue curves characterization and its multiple merits

S-N curve of austempered ductile iron was obtained in the range of lifetime including low cycle fatigue domain and high cycle fatigue domain up to 108 cycles. Ultimate tensile strength is used as a limiting value of the curve. Symmetric push-pull fatigue and tensile tests were performed at room temperature on isothermally treated nodular cast iron alloyed with copper and nickel having positive impact on mechanical, technological and fatigue properties of austempered ductile iron. Suitable functions for the fit of experimentally determined points were tested and their parameters were calculated. The best results were obtained using the Palmgren function and the function introduced by Kohout and Věchet. Since the loading frequency in high-cycle region is two orders higher than in low-cycle region, the effect of loading cycle frequency on fatigue behavior of the studied material is also studied. A possibility of discontinuity of experimental data between low-cycle and high-cycle regions is discussed.

/pdf/fatigue-lifetime-of-adi-from-ultimate-tensile-strength-to-12wgjvbxxa.pdf

Fatigue lifetime of adi from ultimate tensile strength to permanent fatigue limit

Austempered ductile iron (ADI) belongs to structural materials with continuously increasing level of production. Using various conditions of heat treatment, its properties can be changed in rather wide extend according to the purpose of ADI application. The aim of the paper consists in a study of interrelations among the conditions of isothermal transformation, resulting structure of ADI matrix and its static as well as fatigue behaviour. The transformation temperature was changed in the range from 380 °C to 500 °C and fatigue properties of obtained structure were studied in detail determining S-N curves in high-cycle region. Static mechanical properties were compared with fatigue limits obtained by the fit of the whole S-N curves and with the content of stabilized austenite. Optimum fatigue properties were obtained for transformation temperature of 400 °C when ADI matrix obtained the highest content of stabilized austenite.

Fatigue Properties of Austempered Ductile Iron in Dependence on Transformation Temperature

A precise determination of tolerance bands of S-N curves is quite difficult problem; therefore simple approximate constructions of these bands are often used. Castillo et al. suggested a sophisticated and at the same time easy procedure for their estimation which, however, needs a special type of regression function for describing S-N curve. This type of regression function called the Castillo function is suitable only for high-cycle fatigue region close to fatigue limit. The paper focuses on other regression functions used in the Castillo procedure, namely on the Kohout and Vechet function and the Stromeyer function.

Some Estimations of Tolerance Bands of S-N Curves

داهجلإا ىنمتم ةحازإ ىلإ دهجلا ليمحت ةرود ءانثأ يف داهجلإا طسوتم ةدايز يدؤت ) وأ رلهو S-N ( مي ق وحن ىتح ليمحتلا تارود ددع ىلع ادامتعا داهجلإل ىوصقلا ةميقلاب تاينحنملا ليثمت مت اذا كلذو فلاتلإا ىوقل ىلعأ فلتلا ثودح . ركلاو نكمت د قو ) Walker ( فيصوت نم حاجنب فارحنلاا اذ ه . ى لإ ىعس ن ةساردلا هذ ه يفو نم ىدملا لماآ نمض فلتلا ىنحنم فارحنا فصت تاقلاع قاقتشا UTS مئادلا فلتلا ةياهن ىلإ . ةيناكمإ ان يب امآ بصلا د يدحل فلتلا كول س ل ثمت ي تلا تا ينحنملا ن م ة لئاعل ة حجانلا ة مءاوملا للاخ ن م بول سلأا اذ ه ق يبطت لامحأب لمحملا ة لداعم مادختساب تا ينحنملا فصوت امد نع ة لثامتم ريغ ةيرود Stormeyer ة لداعم ى لإ ةفاضإ Kohout و Vechet بولسأ يف روصقلا بناوج ثحبلا اذ ه يف درو ن امآ Walker يلا علا طسوتملا ة لاح يف لاجملا اذه يف ةحرتقملا لولحلا ضعب ضرعن امآ ،داهجلإل .

Shift of s-n curves of ferritic nodular cast iron due to loading cycle asymmetry

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