Dynamic shear deformation and failure of Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy

2017 ◽  
Vol 694 ◽  
pp. 41-47 ◽  
Author(s):  
Chun Ran ◽  
Pengwan Chen ◽  
Ling Li ◽  
Wangfeng Zhang
Keyword(s):  
Titanium Alloy ◽  
Shear Deformation ◽  
Dynamic Shear ◽  
Deformation And Failure

scholarly journals Dynamic Shear Deformation of a Precipitation Hardened Al0.7CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry

Entropy ◽  
2020 ◽  
Vol 22 (4) ◽  
pp. 431
Author(s):  
Bharat Gwalani ◽  
Tianhao Wang ◽  
Abhinav Jagetia ◽  
Sindhura Gangireddy ◽  
Saideep Muskeri ◽  
...  
Keyword(s):  
Shear Deformation ◽  
Split Hopkinson Pressure Bar ◽  
Tensile Deformation ◽  
Shear Bands ◽  
Shear Loading ◽  
High Entropy Alloy ◽  
Local Dynamic ◽  
Dynamic Shear ◽  
High Entropy ◽  
Structural Applications

Lamellar eutectic structure in Al0.7CoCrFeNi high-entropy alloy (HEA) is emerging as a promising candidate for structural applications because of its high strength-ductility combination. The alloy consists of a fine-scale lamellar fcc + B2 microstructure with high flow stresses > 1300 MPa under quasi-static tensile deformation and >10% ductility. The response to shear loading was not investigated so far. This is the first report on the shear deformation of a eutectic structured HEA and effect of precipitation on shear deformation. A split-Hopkinson pressure bar (SHPB) was used to compress the hat-shaped specimens to study the local dynamic shear response of the alloy. The change in the width of shear bands with respect to precipitation and deformation rates was studied. The precipitation of L12 phase did not delay the formation of adiabatic shear bands (ASB) or affect the ASB width significantly, however, the deformed region around ASB, consisting of high density of twins in fcc phase, was reduced from 80 µm to 20 µm in the stronger precipitation strengthened condition. We observe dynamic recrystallization of grains within ASBs and local mechanical response of individual eutectic lamellae before and after shear deformation and within the shear bands was examined using nano-indentation.

scholarly journals Dynamic shear deformation of a CrCoNi medium-entropy alloy with heterogeneous grain structures

2018 ◽  
Vol 148 ◽  
pp. 407-418 ◽  
Author(s):  
Yan Ma ◽  
Fuping Yuan ◽  
Muxin Yang ◽  
Ping Jiang ◽  
Evan Ma ◽  
...  
Keyword(s):  
Shear Deformation ◽  
Dynamic Shear ◽  
Grain Structures

scholarly journals Three-Dimensional Physical Similarity Simulation of the Deformation and Failure of a Gas Extraction Surface Well in a Mining Area

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Junhui Fu ◽  
Haitao Sun ◽  
Guangcai Wen ◽  
Rifu Li
Keyword(s):  
Shear Deformation ◽  
Compressive Strain ◽  
Three Dimensional ◽  
Mining Area ◽  
Gas Extraction ◽  
Horizontal Shear ◽  
Deformation And Failure ◽  
Key Strata ◽  
Mining Areas ◽  
Rock Movement

Surface well deformation and failure in a mining area are a key issue challenging the surface well gas extraction technique. To provide information for the design of gas extraction surface wells in mining areas, the deformation and failure of surface wells with different materials under the influence of mining-induced rock movement were analyzed based on a three-dimensional physical similarity simulation and key strata theory. The research findings reveal that the fractures in the overlying strata had an elliptic-parabolic shape. The stope center was the highest point in the fracture zone. Horizontal shear deformation was most likely to occur in the thick strata (horizontal shear deformation could be larger if they were key strata) with large strength and stiffness near the intersection between the fracture surface of the overlying strata and the surface well. Due to the shear force and bending moment of the key strata, the surface well deformed into an S-shape. In addition, the surface well was vulnerable to shear deformation in the key strata. The surface well deformation did not weaken from bottom to top due to rock movement. Instead, it was subject to the influence of the rupture strength of the key strata. The surface well above the key strata was prone to tensile strain-compressive strain transition. In contrast, an abrupt change in the compressive strain occurred in the surface well below the key strata where tensile failure may occur. Moreover, a mechanical model of the surface well during the movement of the key strata was established according to the characteristics of the surface well deformation. The test results provide important information on the design optimization of surface wells and high-risk area protection in mining areas.

scholarly journals Dynamic Shear Deformation of a Precipitation Hardened Al0.7CoCrFeNi Eutectic High-Entropy Alloy Using Hat-Shaped Specimen Geometry

2020 ◽  
Author(s):  
Bharat Gwalani ◽  
Tianhao Wang ◽  
Abhinav Jagetia ◽  
Sindhura Gangireddy ◽  
Saideep Muskeri ◽  
...  
Keyword(s):  
Shear Deformation ◽  
High Strength ◽  
Shear Loading ◽  
Adiabatic Shear ◽  
Dynamic Strain ◽  
High Entropy Alloy ◽  
Dynamic Shear ◽  
High Entropy ◽  
Structural Applications ◽  
Static Conditions

Lamellar eutectic structure of Al0.7CoCrFeNi high-entropy alloy (HEA) is emerging as a promising candidate for structural applications because of its high strength-ductility combination. The alloy consists of a fine-scale lamellar fcc+B2 microstructure with high flow stresses >1500 MPa under quasi-static conditions. The response to shear loading was not investigated so far. This is the first report on the shear deformation of an eutectic structured HEA and effect of precipitation on shear deformation. The dynamic shear response (DSR) of the eutectic HEA was examined in two microstructural conditions, with and without the presence of L12 precipitates. A split-Hopkinson pressure bar (SHPB) was used to compress the hat-shaped specimens to study the local DSR of the alloy. The adiabatic shear bands (ASBs) in two different microstructural conditions were characterized after deformation at dynamic strain rates. The adiabatic shear localization occurs at low strains for the high strength material, and the eutectic microstructure does not delay cracking. The width of ASBs and the extent of plastic deformation around them has been correlated with the rate of straining. Dynamic recrystallization within ASBs and profuse twinning around it was observed. Local mechanical response of individual lamellae before and after shear deformation was examined using nano-indentation.

scholarly journals Deformation and Failure Analyses of the Surrounding Rock Mass with an Interlayer Shear Zone in the Baihetan Underground Powerhouse

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Fei Yuan ◽  
An-chi Shi ◽  
Jia-wen Zhou ◽  
Wang-bing Hong ◽  
Meng Wang ◽  
...  
Keyword(s):  
Rock Mass ◽  
Shear Deformation ◽  
Shear Zone ◽  
Failure Modes ◽  
Shear Zones ◽  
Surrounding Rock ◽  
Left Bank ◽  
Underground Powerhouse ◽  
Deformation And Failure ◽  
Interlayer Shear

In the process of underground cavern excavation, the existence of the interlayer shear zones or large faults often makes the surrounding rock tend to be unstable or even deformed. Under the influence of interlayer shear zone C2, different degrees of deformation and failure occurred in many parts during the excavation of the Baihetan left bank underground powerhouse. Based on field monitoring and numerical calculation, this paper studies the deformation and failure characteristics of the rock mass with C2 in the whole excavation process and the failure mechanisms are analyzed. The results show that C2 has poor mechanical properties. In the process of excavation, it mainly induces two failure modes: rock collapse and shear deformation, which specifically leads to rock collapses, large deformation and shotcrete cracking in the main powerhouse, and shear deformation in the omnibus bar caves. In addition, the similarities and differences between this study and other studies on the deformation and failure of surrounding rock of underground powerhouse in recent years are discussed, and the relevant treatment measures for C2 are given. The above research results can be a reference for other related studies.

scholarly journals Evaluation of Shear Deformation and Failure of Slope by AE Parameters.

Landslides ◽  
1996 ◽  
Vol 33 (2) ◽  
pp. 17-24
Author(s):  
Katsuo SASAHARA ◽  
Kazushige EBIHARA ◽  
Keiichi MONMA ◽  
Akichika ISHIBASHI
Keyword(s):  
Shear Deformation ◽  
Deformation And Failure
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