Decrease in durability of brittle solids in cyclic tests

Карташов, Э. М.

doi:10.1007/bf00892938

Cited by 3 publications

(6 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the cyclic loading, this barrier will shrink due to the relaxation process, causing the molecular breakdown of the material to occur faster. This phenomenon is explained in detail in Kartashov 33 …”

Section: Theorymentioning

confidence: 89%

“…It has been proven that in the case of fatigue failure with compressive stresses applied to the material, the activation energy U will decrease. 33 Additionally, the coefficient γ for fatigue failure applications will not remain the same value for the static fatigue model. 22 The parameter U corresponds to the energy barrier that creates durability against the applied loading and prevents the breakage of atomic bonds inside the solid.…”

Section: Fatigue Life Modelmentioning

confidence: 99%

“…For a fixed stress amplitude, when the frequency increases, the steady‐state temperature will likewise increase up to a degree (depending on the material's thermo‐mechanical properties). It has been proven that in the case of fatigue failure with compressive stresses applied to the material, the activation energy U will decrease 33 . Additionally, the coefficient γ for fatigue failure applications will not remain the same value for the static fatigue model 22 .…”

Section: Theorymentioning

confidence: 99%

“…This phenomenon is explained in detail in Kartashov. 33 Thus, to determine the parameters U and γ, two sets of experimental fatigue life data, including σ a , N f , and T s from each set are needed. Referring to Equation 14, we note that it can be rewritten as Equation 15to separate the constant and varying parameters:…”

Section: Fatigue Life Modelmentioning

confidence: 99%

“…The model's material-dependent parameters include the activation energy U and coefficient γ. Under the cyclic loading, these parameters will be different from the static strength applications 33,34 and need to be recalculated using the experimental S-N results. We derive the appropriate governing equations and show that FFE can be estimated via the kinetic approach.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

On the kinetic formulation of fracture fatigue entropy of metals

Moghanlou

Khonsari

2021

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

The kinetic concept of the strength of solids is used to determine the fatigue life of stress-controlled cyclic loading and evaluate the fracture fatigue entropy.Unlike the traditional stress or strain-based models, this theory uses the applied stress amplitude and the specimen's surface temperature to determine the lifetime. The degradation fraction in each cycle is used to calculate the life cycle. Then the material parameters of the final life equation are obtained for two materials: low carbon steel 1018 and aluminum 7075-T6. The number of cycles to fracture and the cyclic plastic strain energy (W p ) are used to calculate the fracture fatigue entropy (FFE). It is shown that the life cycle prediction of the proposed model agrees well with the experimental results from the literature. Results provide further evidence for the constancy of FFE.

show abstract

Section: Theorymentioning

confidence: 89%

Section: Fatigue Life Modelmentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Fatigue Life Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On the kinetic formulation of fracture fatigue entropy of metals

Moghanlou

Khonsari

2021

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

Investigation of metal fatigue using a coupled entropy-kinetic model

Mahmoudi

Khonsari

2022

International Journal of Fatigue

View full text Add to dashboard Cite

Calculation of Durability and Fatigue Life Parameters of Structural Alloys Using a Multilevel Model of Acoustic Emission Pulse Flow

Perveitalov

Носов²,

Боровков³

et al. 2022

Metals

View full text Add to dashboard Cite

The issues of durability and fatigue life of various structural materials occupy an important place in the operation of equipment and elements subjected to high stresses. To correctly predict its operation time, knowledge of the unique internal structure of a particular piece of operating equipment is required. To obtain such data, a multilevel model of acoustic emission signal flow is proposed in the article, which is based on the kinetic concept of strength and the selection of various stages of destruction in the kinetics of damage accumulation. The selected information, which accounts for the hypothesis of the linear summation of damage, is used in modern models for calculating fatigue life based on kinetic parameters, e.g., the activation energy of destruction and activation volume. The fracture activation energies, activation volume, destructive load, and fatigue life of various structural alloys and steels were calculated using the proposed acoustic emission model based on static test data from various scientific literature sources. For comparison, several methods of calculating kinetic parameters based on the thermal fluctuation concept of strength were used. In addition, numerical modeling was performed to select the structural lethargy coefficient from the elastic deformation zone. The results of the proposed model are in good agreement with the experimental data and allow—within the framework of more thorough tests and with a more accurate consideration of temperature—for the application of an engineering-based approach with which to evaluate the durability and residual service life of objects.

show abstract

Decrease in durability of brittle solids in cyclic tests

Cited by 3 publications

References 1 publication

On the kinetic formulation of fracture fatigue entropy of metals

On the kinetic formulation of fracture fatigue entropy of metals

Investigation of metal fatigue using a coupled entropy-kinetic model

Calculation of Durability and Fatigue Life Parameters of Structural Alloys Using a Multilevel Model of Acoustic Emission Pulse Flow

Contact Info

Product

Resources

About