Calculation of threshold and critical characteristics of ferritic-pearlitic steels

Matokhin, G. V.; Matokhin, A. V.

doi:10.1007/bf00723233

Cited by 2 publications

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“…The sought-for values of the limiting amplitudes will be obtained by solving the equation for 𝜎𝜎 𝑓𝑓𝑓𝑓 . The characteristics included in (6) are calculated according to [23] or [22]. It is also possible to find the dependence of the contribution of the preliminary plastic deformation of the soft interlayer to the equivalent damage from the position of estimating the length of the macrocrack.…”

Section: Construction Of a Calculation Methodsmentioning

confidence: 99%

Engineering Method for Calculating the Limiting Amplitudes of Stress Cycles for Structural Steels

Molokov

Novikov

Domashevskaya

et al. 2023

MSF

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In large-sized metal structures, various stress concentrators are often present, which affects the operation of the material. These are intermittent bonds, holes, welded joints, material defects, etc. As a result of overloads under the action of an external cyclic load on structures in the area of stress raisers, the cycle asymmetry, the level of maximum stresses and deformations increase. In this case, the determination of the limit values of the stress cycles can be performed using a diagram of the limit stress amplitudes. The paper presents an engineering method for calculating the limiting stress amplitudes and constructing Hay’s diagrams. It is based on the use of mathematical models of classical linear and structural-mechanical fracture mechanics. Analytically and by calculation, the validity of the method is shown, which consists in determining the endurance limits and limiting stress amplitudes under high-cycle loading in a wide range of variation of the cycle asymmetry coefficient for ferrite-pearlite steels with a yield strength of up to 400 MPa. Thus, a generalized calculation method has been developed for determining the endurance limits for high values of cycle asymmetry and cycle stresses. The error of the method is estimated in the area of low-cycle load. The influence of constant and average load in a cycle on the endurance limit has been investigated both for high-cycle and low-cycle loading. The proposed approach allows to construct Smith and Hay’s fatigue diagrams for the tensile region, taking into account the structural characteristics of the material and the error allowed for engineering calculations.

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Section: Construction Of a Calculation Methodsmentioning

confidence: 99%

Engineering Method for Calculating the Limiting Amplitudes of Stress Cycles for Structural Steels

Molokov

Novikov

Domashevskaya

et al. 2023

MSF

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show abstract

“…where 𝐾𝐾 𝑡𝑡ℎ0 and 𝑀𝑀 -coefficient calculated according to [19], and coefficient accepted for external cracks 0,9 [20], crack form correction depending on the metal depth, crack depth [21] respectively. In order to calculate the number of cycles 𝑁𝑁 𝐼𝐼 primitive function will look alike the analogous one obtained in the work [11].…”

Section: The Main Part Mathematical Model On the Basis Of Phenomenolo...mentioning

confidence: 99%

Approximate Engineering Model of Ferritic-Pearlitic Steel Constructions Resource Evaluation

Molokov

Novikov

VASILCHENKO

et al. 2020

MSF

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In the constructions and weld seals microdefects while repeated stress lead to metal structure damage, low-cycle and high-cycle fatigue, and cracks dissemination. The calculation method of operating life estimate presupposes a microcrack development hypothetical speed application. This speed in many cases is unknown. Initial speed determination suggested in this work is based on endurance limit values design analysis when considering a combined problem for the first two sections of fatigue failure kinetic diagram.

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Calculation of threshold and critical characteristics of ferritic-pearlitic steels

Cited by 2 publications

References 1 publication

Engineering Method for Calculating the Limiting Amplitudes of Stress Cycles for Structural Steels

Engineering Method for Calculating the Limiting Amplitudes of Stress Cycles for Structural Steels

Approximate Engineering Model of Ferritic-Pearlitic Steel Constructions Resource Evaluation

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