Observation and quantification of the fracture process zone for two magnesia refractories with different brittleness

Dai, Yajie; Gruber, Dietmar; Harmuth, Harald

doi:10.1016/j.jeurceramsoc.2017.02.005

Cited by 49 publications

(19 citation statements)

References 35 publications

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“…With the onset of macro‐crack (no stress transfers between the crack faces), the normalized AE hits gradually decrease till the end of the test. The characterized fracture process is in accordance with that identified by the DIC technique, which was published elsewhere …”

Section: Resultssupporting

confidence: 80%

“…A cyclic WST was performed with a constant displacement δ, which equals 70% of the displacement at maximum load ( F max ) determined from the monotonic WST. According to the previous studies, it was found that the micro‐cracking of refractories with reduced brittleness initiated in the pre‐peak region at force level around 70% F max . With the given displacement amplitude, primary damage is expected in the first few cycles and the damage will be further accumulated in the consecutive cycles.…”

Section: Methodsmentioning

confidence: 93%

“…According to the previous studies, it was found that the micro-cracking of refractories with reduced brittleness initiated in the pre-peak region at force level around 70% F max . 27 With the given displacement amplitude, primary damage is expected in the first few cycles and the damage will be further accumulated in the consecutive cycles. The re-loading cycles begin when the force decreases to 20 N. This low remaining load ensures the stability of the test.…”

Section: Monotonic and Cyclic Wedge Splitting Testsmentioning

confidence: 99%

“…The characterized fracture process is in accordance with that identified by the DIC technique, which was published elsewhere. 27 Based on the AE analysis, the damage accumulation process and fracture mode can be specified. The so-called LOAD ratio, which was proposed by the Japanese Society for Non-Destructive Inspection, 34 is defined as the ratio between the load at the onset of AE activity of a certain cycle to the maximum load of previous loading cycle and is commonly used to differentiate the "Kaiser effect" and "Felicity effect".…”

Section: Damage Accumulation During Mechanical Cyclic Loadingmentioning

confidence: 99%

See 3 more Smart Citations

Fracture behavior of magnesia refractory materials under combined cyclic thermal shock and mechanical loading conditions

Dai

Jin

et al. 2019

J Am Ceram Soc

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To investigate the effect of cyclic thermal shock and mechanical loading on the fracture behavior of magnesia refractories showing different brittleness, the as‐received and cyclic thermally shocked specimens are subjected to monotonic and cyclic wedge splitting test. The whole duration of test is monitored by digital image correlation and acoustic emission. Both thermal and mechanical fatigue resistance increase with the reduction of brittleness. Repetitive thermal shock results in pronounced reduction of strength. However, the specific fracture energy and nonlinearity increase after exposure to thermal shock due to the expanded micro‐crack network inducing the development of a significant fracture process zone. Periodic loading mainly leads to the decrease of strain bearing capacity, as the fatigue loads favor the extension of crack tip instead of fracture process zone expansion. The combined application of periodic thermal shock and mechanical loads gives a new insight into the progressive damage behavior of refractory under critical conditions.

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Section: Resultssupporting

confidence: 80%

Section: Methodsmentioning

confidence: 93%

Section: Monotonic and Cyclic Wedge Splitting Testsmentioning

confidence: 99%

Section: Damage Accumulation During Mechanical Cyclic Loadingmentioning

confidence: 99%

See 2 more Smart Citations

Fracture behavior of magnesia refractory materials under combined cyclic thermal shock and mechanical loading conditions

Dai

Jin

et al. 2019

J Am Ceram Soc

Self Cite

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show abstract

“…Recently, several studies have reported on how to treat such results and obtain further information from WSTs [14,15,16,17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Analysis of a castable refractory using the wedge splitting test and cohesive zone model

Vargas

Neggers

Canto

et al. 2019

Journal of the European Ceramic Society

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A cohesive zone approach is applied to the Wedge Splitting Test (WST) using the finite element code Abaqus to obtain the tensile strength, the fracture energy and insight about the crack wake region. A Finite Element Model Updating (FEMU) method, with a cost function based on the measured load (FEMU-F), is used to calibrate the sought parameters. Digital Image Correlation (DIC) provided the kinematic boundary conditions, and the images were also used to define the geometry for the finite element analysis. Besides the fracture energy analysis and the experimental load, gray level images and displacement fields are analyzed in order to validate the results. The cohesive region is active in the whole analyzed test as confirmed by estimates using the cohesive length.

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Experimental study on crack initiation and propagation of wood with LT-type crack using digital image correlation (DIC) technique and acoustic emission (AE)

Zhao

et al. 2021

Wood Sci Technol

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Observation and quantification of the fracture process zone for two magnesia refractories with different brittleness

Cited by 49 publications

References 35 publications

Fracture behavior of magnesia refractory materials under combined cyclic thermal shock and mechanical loading conditions

Fracture behavior of magnesia refractory materials under combined cyclic thermal shock and mechanical loading conditions

Analysis of a castable refractory using the wedge splitting test and cohesive zone model

Experimental study on crack initiation and propagation of wood with LT-type crack using digital image correlation (DIC) technique and acoustic emission (AE)

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