scholarly journals Crack Propagation Behavior in Alumina Ceramic under Static and Cyclic Loading

1993 ◽  
Vol 36 (4) ◽  
pp. 354-360
Author(s):  
Yozo Sawaki ◽  
Yasuo Nagase ◽  
Hajime Yoshida ◽  
Akio Inoue ◽  
Tsuyoshi Fujiwara
Keyword(s):  
Cyclic Loading ◽  
Crack Propagation ◽  
Alumina Ceramic ◽  
Propagation Behavior ◽  
Static And Cyclic Loading ◽  
Crack Propagation Behavior

Numerical Investigations of Phenomena Caused by the Closure and Growth Behavior of Short Cracks Under Thermal Cyclic Loading

2010 ◽  
Author(s):  
Ju¨rgen Rudolph ◽  
Kai Bauerbach ◽  
Michael Vormwald
Keyword(s):  
Cyclic Loading ◽  
Crack Propagation ◽  
Crack Closure ◽  
Thermal Loading ◽  
Hysteresis Loops ◽  
Local Stress ◽  
Damage Parameter ◽  
Loading Conditions ◽  
Propagation Behavior ◽  
Crack Propagation Behavior

Thermal cyclic loading conditions of nuclear power plant components cause local stress-strain hystereses which are considered to be fatigue relevant events. The contributions of the hysteresis-loops to the fatigue process are evaluated using a damage parameter based on the effective cyclic J-integral which also includes the effects of crack closure. The successful application of such a short crack propagation approach essentially depends on the realistic description of the crack closure. In this context a finite element based algorithm is presented to simulate the opening and closure effects under special consideration of thermal cyclic loading conditions. The concept is based on node release and contact mechanisms. The implications of the crack propagation on the temperature at the crack tip are to be considered. In this context, the consequences of the altered temperature profile as the crack propagates have to be taken into account. It is the aim to formulate Newman-type analytical equations in order to incorporate the influence of crack closure into an engineering approach. Furthermore, the peculiarities of transient thermal loading on the crack propagation behavior are considered. The reduced crack propagation rates due to the temperature gradient in the direction of the wall are investigated numerically in order to describe the reduction of the damage contribution and decelerated crack propagation rates. The effects of changing thermal conditions in the wall on the crack propagation behavior are considered within the numerical algorithm.

scholarly journals Crack Propagation Behavior under Cyclic Loading in a α-Titanium Single Crystals

1997 ◽  
Vol 61 (1) ◽  
pp. 41-48 ◽  
Author(s):  
Yoji Mine ◽  
Shinji Ando ◽  
Kazuki Takashima ◽  
Hideki Tonda ◽  
Yakichi Higo
Keyword(s):  
Cyclic Loading ◽  
Crack Propagation ◽  
Single Crystals ◽  
Propagation Behavior ◽  
Alpha Titanium ◽  
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.

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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