An improved Lubliner strength model based on Ottosen failure criterion for concrete under multiaxial stress state

2021 ◽  
Author(s):  
Bo Lei ◽  
Taiyue Qi ◽  
Yan Li ◽  
Shaojie Qin
Keyword(s):  
Stress State ◽  
Failure Criterion ◽  
Strength Model ◽  
Multiaxial Stress ◽  
Model Based ◽  
Multiaxial Stress State

Analysis on Fracture Morphology and Microstructure of T92 Steel after High Temperature Multiaxial Creep

2013 ◽  
Vol 860-863 ◽  
pp. 967-971
Author(s):  
Xue Ping Mao ◽  
Xiao Wang ◽  
Sai Dong Huang ◽  
Chao Li ◽  
Hong Xu ◽  
...  
Keyword(s):  
High Temperature ◽  
Stress State ◽  
Standard Specimen ◽  
Uniaxial Stress ◽  
Fracture Morphology ◽  
Multiaxial Stress ◽  
Creep Life ◽  
Creep Tests ◽  
Multiaxial Stress State ◽  
Multiaxial Creep

The high temperature creep tests of standard specimen and double U-type notch specimen of T92 steel were carried out under different stresses at 650 °C. Then optical microscopy and scanning electron microscopy were used to observe the fracture morphology and microstructure. The results show that the multiaxial stress state leads to the creep fracture cracking initiation in notch. Under multiaxial stress state, the failure mode of T92 steel is transgranular and dimple plastic fracture, and is more obvious with the increase of creep life. Compared with under uniaxial stress state, the precipitates under multiaxial stress state are larger in size and quantity, and are much coarser.

Effect of multiaxial stress state on creep damage in ASME T92 welded joint

2020 ◽  
Vol 43 (5) ◽  
pp. 907-918
Author(s):  
Xiao Wang ◽  
Xue Wang ◽  
Chuang Wang ◽  
Ya‐Lin Zhang ◽  
Qiao‐Sheng Huang
Keyword(s):  
Stress State ◽  
Welded Joint ◽  
Creep Damage ◽  
Multiaxial Stress ◽  
Multiaxial Stress State

Reliability Evaluation of Structural Ceramics Under Multiaxial Stress State

1998 ◽  
Author(s):  
Takashi Ono ◽  
Masaki Kaji ◽  
Michiaki Nishimura
Keyword(s):  
Experimental Data ◽  
Distribution Function ◽  
Stress State ◽  
Fracture Probability ◽  
Test Method ◽  
Structural Ceramics ◽  
Multiaxial Stress ◽  
Fatigue Lifetime ◽  
Empirical Parameter ◽  
Multiaxial Stress State

Strength and fatigue lifetime of structural ceramics under multiaxial stress state have been estimated and compared with experimental data. Biaxial strength tests were done by an anticlastic bending test method at room temperature. Biaxial fatigue tests were done by anticlastic bending and also ring-on-ring test method at 1200°C in air. Fracture probability and lifetime were predicted on the basis of a Weibull multiaxial distribution function and subcritical crack growth, using the results of stress analyses by the finite element method. Modified maximum hoop stress theory including an empirical parameter, T, was applied to the equivalent normal stress in the multiaxial distribution function. The empirical parameter T represents a shear stress sensitivity to mixed-mode fracture due to a grain interlocking effect. It has been confirmed that the predicted fracture probability and the fatigue lifetime agrees well with the experimental data if grain interlocking effects are taking into account.

Microstructure evolution mechanisms in nickel-based single crystal superalloys under multiaxial stress state

2019 ◽  
Vol 797 ◽  
pp. 1059-1077 ◽  
Author(s):  
Yamin Zhang ◽  
Zhixun Wen ◽  
Haiqing Pei ◽  
Yanchao Zhao ◽  
Zhenwei Li ◽  
...  
Keyword(s):  
Stress State ◽  
Single Crystal ◽  
Microstructure Evolution ◽  
Multiaxial Stress ◽  
Multiaxial Stress State
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