Fatigue crack growth rates and paths in two planar specimens under mixed mode loading

Varfolomeev, Igor; Burdack, M.; Moroz, S.; Siegele, Dieter; Kadau, Kai

doi:10.1016/j.ijfatigue.2013.04.013

Cited by 20 publications

(4 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the crack grows 15.6 mm with 91,248 cycles in Fig. 5i, it approaches to the opposite hole, and its growth direction changes obviously and turns toward the opposite hole, as reported in previous references [7,26]. Figure 5 also illustrates the stress distribution around the cracks tip at different crack extension steps, which can explain the causes of the above-described crack paths.…”

Section: Numerical Simulation Process Of Fcgsupporting

confidence: 75%

Simulation of fatigue cracks growth processes of two parallel cracks in thin plate pulled by the constant amplitude cyclic loading

Zhang

Wang

Wei

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

In the paper, the propagation processes of two parallel cracks in 2-mm-thick plate pulled by the cyclic loading were investigated by numerical simulation and experiment. The codes Abaqus and Franc3D were implemented jointly to predict the crack growth path, the stress distribution around the cracks tip and the fatigue life. The corresponding fatigue experiment was carried out on a servo-hydraulic fatigue testing machine. The investigation indicates that the predicted crack paths agree well with the experimental results at the crack propagation early stage, and the predicted crack growth rate is consistent with the findings in experiment, which validate the prediction of the mixed mode crack propagation processes.

show abstract

Section: Numerical Simulation Process Of Fcgsupporting

confidence: 75%

Simulation of fatigue cracks growth processes of two parallel cracks in thin plate pulled by the constant amplitude cyclic loading

Zhang

Wang

Wei

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…The fatigue crack growth can be described by established engineering fracture mechanics [5,[7][8][9]. However, no established engineering method is readily available for the nucleation process, as it critically depends on the details of the flaw structure and properties.…”

Section: Introductionmentioning

confidence: 99%

Crack nucleation at forging flaws studied by non-local peridynamics simulations

Karim

Kadau

Narasimhachary

et al. 2021

Mathematics and Mechanics of Solids

View full text Add to dashboard Cite

We present a computational study and framework that allows us to study and understand the crack nucleation process from forging flaws. Forging flaws may be present in large steel rotor components commonly used for rotating power generation equipment including gas turbines, electrical generators, and steam turbines. The service life of these components is often limited by crack nucleation and subsequent growth from such forging flaws, which frequently exhibit themselves as non-metallic oxide inclusions. The fatigue crack growth process can be described by established engineering fracture mechanics methods. However, the initial crack nucleation process from a forging flaw is challenging for traditional engineering methods to quantify as it depends on the details of the flaw, including flaw morphology. We adopt the peridynamics method to describe and study this crack nucleation process. For a specific industrial gas turbine rotor steel, we present how we integrate and fit commonly known base material property data such as elastic properties, yield strength, and S-N curves, as well as fatigue crack growth data into a peridynamic model. The obtained model is then utilized in a series of high-performance two-dimensional peridynamic simulations to study the crack nucleation process from forging flaws for ambient and elevated temperatures in a rectangular simulation cell specimen. The simulations reveal an initial local nucleation at multiple small oxide inclusions followed by micro-crack propagation, arrest, coalescence, and eventual emergence of a dominant micro-crack that governs the crack nucleation process. The dependence on temperature and density of oxide inclusions of both the details of the microscopic processes and cycles to crack nucleation is also observed. The results are compared with fatigue experiments performed with specimens containing forging flaws of the same rotor steel.

show abstract

“…It is for this reason that the study of crack propagation has become essential in damage tolerance design approaches and failure analyses. Two fundamental aspects of the crack propagation stage are the crack path and the crack growth rate [1,2]. In addition, components are usually subjected to multiaxial cyclic loading, giving rise to crack multi-mode loading, as it is the case in fretting fatigue cracks.…”

Section: Introductionmentioning

confidence: 99%

The minimum shear stress range criterion and its application to crack orientation prediction in incomplete contact fretting problems

Infante-García

Llavori

Zabala

et al. 2019

International Journal of Fatigue

View full text Add to dashboard Cite

A proper prediction of crack paths is required when assessing accurately the fatigue crack propagation life. Recently, some authors have pointed out that the criterion of minimum shear stress range leads to inconsistent results when predicting fretting crack paths under incomplete contacts. In this paper, different fretting experiments with cylinder-to-flat contact found in the literature are reviewed, and the corresponding crack path prediction using the extended finite element method and the minimum shear stress range crack orientation criterion is performed. Results show the applicability of the criterion to predict the crack orientation during stage II in incomplete contact fretting problems.

show abstract

Fatigue crack growth rates and paths in two planar specimens under mixed mode loading

Cited by 20 publications

References 12 publications

Simulation of fatigue cracks growth processes of two parallel cracks in thin plate pulled by the constant amplitude cyclic loading

Simulation of fatigue cracks growth processes of two parallel cracks in thin plate pulled by the constant amplitude cyclic loading

Crack nucleation at forging flaws studied by non-local peridynamics simulations

The minimum shear stress range criterion and its application to crack orientation prediction in incomplete contact fretting problems

Contact Info

Product

Resources

About