Quantifying damage evolution within olivine basalt based on crack propagation behavior under microwave irradiation

2021 ◽  
pp. 105678952110173
Author(s):  
Yuan Yuan ◽  
Zhushan Shao ◽  
Rujia Qiao ◽  
Xinshuang Fei ◽  
Dandan Wu
Keyword(s):  
Microwave Irradiation ◽  
Crack Propagation ◽  
Damage Evolution ◽  
Characteristic Length ◽  
Mineral Particle ◽  
Short Cracks ◽  
Propagation Behavior ◽  
Heating Effects ◽  
Mineral Components ◽  
Crack Propagation Behavior

Application of microwave heating technique is highly promising in assisting rocks breakage and recycling coarse aggregate in waste concrete. This work focus on crack propagation behavior and hence damage of hard rocks subjected to microwave irradiation. Heating effects of basalt and its main mineral components are investigated experimentally using a multimode industrial microwave system. Crack characterization of basalt after irradiating are observed using scanning electron micrograph (SEM). A theoretical model based on heating effects of mineral components is established to deduce crack propagation within basalt under microwave irradiation. Temperature rise of magnetite is drastic while that of other mineral components are tardy. Fracture of basalt is induced by predominant radial crack propagation around the rapidly heated mineral particle. Cracks can be divided into short cracks and long cracks by a characteristic length during extending. Microwave energy required for extension of cracks with characteristic length is minimum. Propagation of initial short cracks results in greater extent of damage evolution instantaneously. Moreover, damage increases with the mineral content of magnetite and decreases with crack density.

scholarly journals Crack Propagation Behavior of a Ni-Based Single-Crystal Superalloy during In Situ SEM Tensile Test at 1000 °C

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1047
Author(s):  
Wenxiang Jiang ◽  
Xiaoyi Ren ◽  
Jinghao Zhao ◽  
Jianli Zhou ◽  
Jinyao Ma ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Tensile Test ◽  
Single Crystal ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Single Crystal Superalloy ◽  
Propagation Path ◽  
Propagation Behavior ◽  
Crack Propagation Behavior

An in situ scanning electron microscope (SEM) tensile test for Ni-based single-crystal superalloy was carried out at 1000 °C. The stress displacement was obtained, and the yield strength and tensile strength of the superalloy were 699 MPa and 826 MPa, respectively. The crack propagation process, consisting of Model I crack and crystallographic shearing crack, was determined. More interestingly, the crack propagation path and rate affected by eutectics was directly observed and counted. Results show that the coalescence of the primary crack and second microcrack at the interface of a γ/γ′ matrix and eutectics would make the crack propagation rate increase from 0.3 μm/s to 0.4 μm/s. On the other hand, crack deflection decreased the rate to 0.05 μm/s. Moreover, movement of dislocations in front of the crack was also analyzed to explain the different crack propagation behavior in the superalloy.

Crack propagation behavior of inhomogeneous laminated Ti−Nb metal−metal composite

2019 ◽  
Vol 29 (9) ◽  
pp. 1882-1888 ◽  
Author(s):  
Wen-juan CHENG ◽  
Yong LIU ◽  
Da-peng ZHAO ◽  
Bin LIU ◽  
Yan-ni TAN ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Metal Composite ◽  
Propagation Behavior ◽  
Metal Metal ◽  
Crack Propagation Behavior
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