Determination of the fracture behaviour of MgO-refractories using multi-cycle wedge splitting test and digital image correlation

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

“…As seen in Figure B, δ ir , δ el and the bold contour area represent respectively the irreversible displacement, elastic displacements and the irreversible energy consumption for the crack extension Δa occurred for one loading‐unloading cycle. Based on these extracted parameters, the deviation from pure linear elastic behavior and instantaneous crack growth resistance can be evaluated …”

“…Damage under thermal shock test is mainly quantified by residual strength after certain thermal cycles or allowable cycle numbers before failure . A cyclic mechanical test is a promising method to investigate the fatigue degradation and fracture mechanism of refractories . For quasi‐brittle materials, there are different strategies to perform the cyclic test, such as constant strain limits, constant stress limits, increasing maximum strain and constant strain .…”

“…Combining it with nondestructive methods and analytical methods, the fracture mechanism can be also better understood . For example, the crack propagation resistance and fracture behavior of magnesia refractories were investigated using a graphical method and digital image correlation technique (DIC) . For improving the refractory life and simulating the failure of refractory under service condition, the overall influence of thermal and mechanical loads on the performance of refractory ceramics was studied .…”

“…9,10 A cyclic mechanical test is a promising method to investigate the fatigue degradation and fracture mechanism of refractories. [11][12][13][14] For quasi-brittle materials, there are different strategies to perform the cyclic test, such as constant strain limits, constant stress limits, increasing maximum strain and constant strain. 15,16 Thereinto, the constant strain approach is more suitable for the refractories because they are often subjected to thermal expansion-induced mechanical loads.…”

“…[17][18][19][20][21] For example, the crack propagation resistance and fracture behavior of magnesia refractories were investigated using a graphical method and digital image correlation technique (DIC). 11 For improving the refractory life and simulating the failure of refractory under service condition, the overall influence of thermal and mechanical loads on the performance of refractory ceramics was studied. 16,[22][23][24] Chlup et al 22 compared the fracture toughness of as-received and water quenched cordierite-mullite refractory using monotonic mechanical test.…”