Dynamic tensile characteristics of elliptically shaped Ni8Ti9Cr1 rings

Yan，Kai1,2,3; Cao，Xunqiandi1; Wang，Zhaokun4; Chu，Kangjie1; Mei，Haijuan1,5; Tang，Jianbo6; Ren，Fuzeng1

2024-10-01

10.1016/j.ijmecsci.2024.109444

International Journal of Mechanical Sciences   影响因子和分区

0020-7403

Thin-walled tubes with elliptically shaped annular sections are widely applied in fuel ducts and exhaust pipes. However, the tensile mechanical properties of these structures have remained elusive due to the lack of accurate testing methods. This study aims to fill this gap by establishing circumferential tensile testing methods for static and dynamic conditions by employing a split Hopkinson tensile bar and an electronic universal tensile machine. The quasistatic and dynamic tensile characteristics of two distinct elliptically shaped NiTiCr rings with different aspect ratios were investigated at room temperature, revealing a significant loading rate effect. The tensile curves exhibited considerable fluctuations, which diminshed as aspect ratios decreased. These fluctuations were attributed to stress waves propagating back and forth between the specimen, the clamp, and the bars, causing superimposition. The Johnson‒Cook (JC) model was established based on the experimental results and then incorporated into the finite element model to gain deep insights into the mechanical responses of the NiTiCr rings under tension. Our findings reveal that dynamic tensile testing of elliptically shaped NiTiCr rings induces a complex stress state, which leads to nonuniform necking effects and structural vibrations, revealing complex behaviors previously unexplored. This investigation significantly advances the understanding of quasistatic and dynamic tensile responses in elliptically shaped ring structures, shedding light on their mechanical intricacies across varying conditions.

Elliptically shaped ring Loading rate effect Mechanical properties Split Hopkinson tensile bar Vibration

SCI ; EI

英语

第一 ; 通讯

20242516294477

Aspect ratio ; Chromium alloys ; Ductile fracture ; Structural dynamics ; Tensile testing ; Ternary alloys ; Thin walled structures ; Vibrations (mechanical)

Structural Design:408 ; Titanium and Alloys:542.3 ; Chromium and Alloys:543.1 ; Mechanics:931.1

ENGINEERING

2-s2.0-85196393551

Scopus

1.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
2.Department of Mechanical and Aerospace Engineering,The Hong Kong University of Science and Technology,Hong Kong,Hong Kong
3.School of Aeronautics,Northwestern Polytechnical University,Xi'an,710072,China
4.Department of Mechanical Engineering,The Hong Kong Polytechnic University,Kowloon,Hong Kong,China
5.Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices,Huizhou University,Huizhou,516007,China
6.Advanced Manufacturing Center,Ningbo Institute of Technology,Beihang University,Ningbo,315100,China

Yan，Kai,Cao，Xunqiandi,Wang，Zhaokun,et al. Dynamic tensile characteristics of elliptically shaped Ni8Ti9Cr1 rings[J]. International Journal of Mechanical Sciences,2024,278.

Yan，Kai.,Cao，Xunqiandi.,Wang，Zhaokun.,Chu，Kangjie.,Mei，Haijuan.,...&Ren，Fuzeng.(2024).Dynamic tensile characteristics of elliptically shaped Ni8Ti9Cr1 rings.International Journal of Mechanical Sciences,278.

Yan，Kai,et al."Dynamic tensile characteristics of elliptically shaped Ni8Ti9Cr1 rings".International Journal of Mechanical Sciences 278(2024).