Fatigue phenomena

Kocańda, S.

doi:10.1007/978-94-009-9914-5_2

Cited by 3 publications

(7 citation statements)

References 57 publications

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“…Ширину зоны усталостного роста трещины приравнивают к критической длине трещины [45]. Следовательно, при оптимальном режиме облучения поверхности силумина пучком электронов удаётся увеличить критическую длину трещины более чем в три раза, увеличивая тем самым ресурс работоспособности материала.…”

Section: результаты исследований и их обсуждениеunclassified

“…По величине отношения площади чисто усталостной зоны к площади зоны, занятой доломом, можно ориентировочно судить о значении коэффициента безопасности данного материала [45]: чем меньше это отношение, тем ниже коэффициент безопасности при одной и той же величине нагрузки усталостных испытаний.…”

Section: результаты исследований и их обсуждениеunclassified

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Untitled

2015

Usp. Fiz. Met.

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fiziki-metallov.html?___SID=U (подписной индекс УФМ: 21864) по ценам «Каталога изданий Украины», редакция будет использовать систему заказов, направляемых непосредственно редакции. Для получения журнала заинтересованные лица и организации должны перевести на валютный расчётный счёт Института металлофизики НАН Украины сумму, соответствующую заказу (по редакционной цене). Оплата производится платёжным поручением (почтовым переводом): «Получателю»: Филиал ПАО «Государственный экспортно-импортный банк Украины» в г. Киеве (Украина, 04053 Киев-53, ул. Воровского, 11 б ) на расчётный счёт № 2530701403786 МФО 380333 для «Поставщика» -Института металлофизики НАН Украины Назначение платежа: за журнал «Успехи физики металлов» для РИО ИМФ НАНУ Основание: предоплата 100% Стоимость одного номера журнала, включая и стоимость его пересылки, за пределами Украины в странах СНГ составляет 990 рос. рублей; стоимость тома -3960 рос. руб. соответственно. Периодичность журнала -4 номера в год. Копию платёжного поручения про оплату (почтового перевода) вместе с письменным уведомлением о заказе и подробным почтовым адресом для доставки журнала следует направить по адресу: Редакция журнала «Успехи физики металлов»,

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Section: результаты исследований и их обсуждениеunclassified

Untitled

2015

Usp. Fiz. Met.

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“…Fatigue is a phenomenon in which a material is subjected to a certain number of cyclic loads at a stress level lower than the strength limit, and crack sprouting and expansion gradually occur, eventually leading to fracture failure [ 1 , 2 ]. Fatigue damage is one of the most common forms of failure in engineering practice.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life Data Fusion Method of Different Stress Ratios Based on Strain Energy Density

Wang,

Yao,

Zhang

et al. 2024

Materials

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To accurately evaluate the probabilistic characteristics of the fatigue properties of materials with small sample data under different stress ratios, a data fusion method for torsional fatigue life under different stress ratios is proposed based on the energy method. A finite element numerical modeling method is used to calculate the fatigue strain energy density during fatigue damage. Torsional fatigue tests under different stresses and stress ratios are carried out to obtain a database for research. Based on the test data, the Wt-Nf curves under a single stress ratio and different stress ratios are calculated. The reliability of the models is illustrated by the scatter band diagram. More than 85% of points are within ±2 scatter bands, indicating that the fatigue life under different stress ratios can be represented by the same Wt-Nf curve. Furthermore, P-Wt-Nf prediction models are established to consider the probability characteristics. According to the homogeneity of the Wt-Nf model under different stress ratios, we can fuse the fatigue life data under different stress ratios and different strain energy densities. This data fusion method can expand the small sample test data and reduce the dispersion of the test data between different stress ratios. Compared with the pre-fusion data, the standard deviations of the post-fusion data are reduced by a maximum of 21.5% for the smooth specimens and 38.5% for the notched specimens. And more accurate P-Wt-Nf curves can be obtained to respond to the probabilistic properties of the data.

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“…The literature provides equations and coefficients on the basis of which the fatigue strength of various steel grades can be determined depending on the strength derived from the static tensile test (1) [ 41 ]. z g = c · R m , …”

Section: Introductionmentioning

confidence: 99%

“…There are also well known relationships to determine the static strength of the material based on its hardness (2) [ 41 ]. R m = d · H , …”

Section: Introductionmentioning

confidence: 99%

Influence of the Scatter Index of Non-Metallic Inclusions in Structural Steel on the Fatigue Resistance Coefficient

Lipiński

2023

Materials

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One of the main parameters characterizing steel is tensile strength. Conducting actual research is time consuming and expensive. For this reason, the technique uses simplified methods that allow one to quickly estimate the resistance of the material to fatigue. They are conducted mainly by computer methods. For the proper development of programs to determine the fatigue parameters of steel, solid data preparation is necessary. Unfortunately, some studies are performed on materials produced in laboratory conditions, which is only an approximation of the actual production conditions. Real alloys contain natural impurities which can affect their properties. Therefore, it is important to use real results obtained on an industrial scale for analysis including computer simulations. One of the important parameters that can be used to describe the properties of steel is the scatter index. It is the quotient of the average distance between the pollution and the average size of the pollution. This parameter makes it possible to take into account the fatigue strength of steel, taking into account the size of impurities and the distance between these impurities. The paper attempted to determine the scatter index and its impact on the fatigue resistance coefficient for steel melted in an industrial 140 ton electric furnace. The tests were carried out on structural steel with an average carbon content of 0.26%. The steel was hardened and tempered in all temperature tempering ranges (low, medium, and high). The fatigue resistance coefficient in the scatter index function was determined and discussed for each of the applied heat treatment parameters.

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Fatigue phenomena

Cited by 3 publications

References 57 publications

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Fatigue Life Data Fusion Method of Different Stress Ratios Based on Strain Energy Density

Influence of the Scatter Index of Non-Metallic Inclusions in Structural Steel on the Fatigue Resistance Coefficient

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