scholarly journals Observation of Crack Propagation Behavior and Visualization of Internal Stress Field during Wheel Scribing of Glass Sheet

2015 ◽  
Vol 81 (3) ◽  
pp. 270-275 ◽  
Author(s):  
Souta MATSUSAKA ◽  
Genta MIZOBUCHI ◽  
Hirofumi HIDAI ◽  
Akira CHIBA ◽  
Noboru MORITA ◽  
...  
Keyword(s):  
Stress Field ◽  
Crack Propagation ◽  
Internal Stress ◽  
Glass Sheet ◽  
Propagation Behavior ◽  
Internal Stress Field ◽  
Crack Propagation Behavior

10517 High-speed camera observation of crack propagation behavior during wheel scribing of glass sheet

2015 ◽  
Vol 2015.21 (0) ◽  
pp. _10517-1_-_10517-2_
Author(s):  
Keita Aoki ◽  
Souta Matsusaka ◽  
Hirofumi Hidai ◽  
Akira Chiba ◽  
Noboru Morita
Keyword(s):  
Crack Propagation ◽  
High Speed ◽  
Glass Sheet ◽  
High Speed Camera ◽  
Propagation Behavior ◽  
Crack Propagation Behavior

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.

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