Mixed mode fracture tests and inversion of FPZ at crack tip of overlying strata in underground coal gasification combustion cavity under real-time high temperature condition

2020 ◽  
Vol 239 ◽  
pp. 107298 ◽  
Author(s):  
Tao Meng ◽  
Xue Guangwu ◽  
Ma Jiwei ◽  
Yue Yang ◽  
Wen Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Mixed Mode ◽  
Coal Gasification ◽  
Mixed Mode Fracture ◽  
Underground Coal Gasification ◽  
Mode Fracture ◽  
Fracture Tests ◽  
High Temperature Condition ◽  
And Inversion ◽  
Overlying Strata

Mixed Mode Fracture Tests on Concrete

1989 ◽  
pp. 117-130 ◽  
Author(s):  
H. W. Reinhardt ◽  
H. A. W. Cornelissen ◽  
D. A. Hordijk
Keyword(s):  
Mixed Mode ◽  
Mixed Mode Fracture ◽  
Mode Fracture ◽  
Fracture Tests

Numerical Investigation of Adhesively Bonded Joints

2013 ◽  
Vol 392 ◽  
pp. 105-109
Author(s):  
Mahmood Mokhtari Hasan Abad ◽  
Reza Bakhtiari ◽  
Naghdali Choupani
Keyword(s):  
Mixed Mode ◽  
Fracture Behaviour ◽  
Mixed Mode Fracture ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Mode Fracture ◽  
Aerospace Material ◽  
Numerical Studies ◽  
Fracture Tests

The study focuses on using fracture mechanics to evaluate mixed-mode fracture properties of adhesively bonded aerospace material systems. As a part of experimental efforts, mixed-mode fracture tests were performed using modified Arcan specimens consisting of several combinations of adhesive, composite and metallic adherends using a special loading device. Experimental and numerical studies of mixed-mode fracture behaviour of adhesively bonded aluminum and steel were also performed using an adhesive in the aerospace industry. Finite element analyses were carried out on specimens with different adherends. Based on those analyses, many fundamental numerical results were obtained.

Evaluation of Generalized MTS Criterion for Mixed-Mode Fracture of Polyurethane Materials

2013 ◽  
Vol 577-578 ◽  
pp. 117-120 ◽  
Author(s):  
Radu Negru ◽  
Liviu Marşavina ◽  
Hannelore Filipescu
Keyword(s):  
Mixed Mode ◽  
Full Range ◽  
Experimental Results ◽  
Mode I ◽  
Mode Ii ◽  
Mixed Mode Fracture ◽  
Pure Mode ◽  
Bend Specimen ◽  
Mode Fracture ◽  
Fracture Tests

Using the asymmetric semi-circular bend specimen (ASCB) a set of mixed-mode fracture tests were carried out in the full range from pure mode I to pure mode II. The tests were conducted on two polyurethane materials characterized by different properties. The fracture parameters were obtained from experiments and are compared with the predictions based on the generalized MTS criterion (GMTS). The agreement between the experimental results and those predicted based on the GMTS criterion is discussed finally.

Biaxial Fracture Behavior of Polycrystalline Alumina

2005 ◽  
Vol 475-479 ◽  
pp. 1329-1332
Author(s):  
Masayuki Tsukada ◽  
Eiichi Sato ◽  
Kazuhiko Kuribayashi
Keyword(s):  
Fracture Toughness ◽  
Mixed Mode ◽  
Fracture Behavior ◽  
Mixed Mode Fracture ◽  
Polycrystalline Alumina ◽  
Mode Fracture ◽  
Multiaxial Stress State ◽  
Four Point Bending ◽  
Biaxial Tests ◽  
Fracture Tests

Fracture behavior under multiaxial stress state of polycrystalline alumina was studied from the view point of an artificial crack propagation and fracture from a natural flaw. The former was studied by mixed-mode fracture toughness tests; asymmetric four-point bending and diametral compression techniques were carried out using precracked and notched specimens. The latter was studied by biaxial fracture tests in compression and torsion loading; multiaxial fracture statistics was applied to the measured fracture envelope. The ratio KIIC/KIC obtained from the biaxial tests was higher than that obtained by the mixed-mode fracture toughness tests. It revealed that the fracture from an artificial flaw does not simulate the fracture from a naturall flaw in polycrystalline ceramics.

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