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J. Cent. South Univ. (2021) 28: 954-967 DOI: https://doi.org/10.1007/s11771-021-4656-3 Non-linear creep damage model of sandstone under freeze-thaw cycle LI Jie-lin(李杰林)1, 2, 3, ZHU Long-yin(朱龙胤)1... Nature 2021 Abstract: To study rock damage characteristics under long-term freeze-thaw cycles and loads, rock freeze-thaw and creep damage factors were defined based on nuclear magnetic resonance......
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Triaxial creep tests of weak sandstone from fracture zone of high dam foundationZHANG Yu(张玉)1, 2, XU Wei-ya(徐卫亚)2, GU Jin-jian(顾锦健)2, WANG Wei(王伟)2(1. College of Pipeline and Civil Engineering, China... at the dam foundation of a hydropower station is weak sandstone with poor integrity and pore cementation contact. Its creep properties have a significant impact on the deformation and stability......
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the lamellar structure and the spheroidized structure in ZA27-RE alloy were finer than in ZA27 alloy during compressive creep test at 160℃ at the same creep time, and the compressive creep resistance... 610065, China摘 要:<正> The effect of the mixed rare earths of Ce on the phase transformation in as cast ZA27 alloy during compressive creep......
intergranularly. As the creep condition changes from 760?C/645 MPa to 900?C/315 MPa and 950?C/235 MPa, the ? phase starts to raft, which reduces the creep deformation resistance and increases...Tensile, creep behavior and microstructure evolution of an as-cast Ni-based K417G polycrystalline superalloyBeining Du1,Ziyang Hu1,2,Liyuan Sheng1,Chuanyong Cui3,Jinxia Yang3,Yufeng Zheng1,Xiaofeng......
temperatures due to the thermal stability of Ca-containing phases. At elevated temperatures, the creep resistance of ZA62 based alloys containing calcium is significantly higher than that of AZ91 which... creep resistance at elevated temperatures above 150 ℃, however, the castability of these alloys is poor and the cost is too high for applications in automobile products[2-3]. Therefore, it is pressing......
J. Cent. South Univ. Technol. (2008) 15(s1): 311-315 DOI: 10.1007/s11771-008-370-7 Relations of complete creep processes and triaxial stress-strain curves of rock LI Yun-peng(李云鹏), WANG Zhi-yin... of triaxial compressive creep tests for five kinds of rock under the different stress loading, unloading and cycle-loading-unloading conditions, the creep deformation is not only a function of stress......
(CSL) boundaries which was a possible cause for improving the creep rupture resistance. The fracture surface of RE-added steel exhibited less intergranular cracks suggesting the alteration on the nature... cause for longer creep duration. These results strongly suggested that the effect of RE alloying played a crucial role in improving the creep rupture resistance.关键词:......
