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Evolution of bone structure under axial and transverse loads
Qu, Chuanyong,Qin, Qing-Hua Techno-Press 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.24 No.1
The evolution process of an initially homogeneous bone structure under axial and transverse loads is investigated in this paper. The external loads include axial and external lateral pressure, electric, magnetic and thermal loads. The theoretical predictions of evolution processes are made based on the adaptive elasticity formulation and coupled thermo-magneto-electro-elastic theory. The adaptive elastic body, which is a model for living bone diaphysis, is assumed to be homogeneous in its anisotropic properties and its density. The principal result of this paper is determination of the evolution process of the initially homogeneous body to a transversely inhomogeneous body under the influence of the inhomogeneous stress state.
Yingbo Bai,Rui Zhang,Chuanyong Cui,Yizhou Zhou,Xiaofeng Sun 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.2
This study investigates the thermal stability of a GH4065A superalloy at intermediate temperatures by conducting long-termaging treatments for 100–6000 h at 700–800 °C. Secondary γ′-phase coarsening and intergranular M6Ccarbide precipitationoccurred during aging. The activation energy for secondary γ′-phase coarsening was 259.89 ± 25.45 kJ mol−1, suggestingthat this process was predominantly controlled by elemental diffusion. The tensile strength at a testing temperature of 700 °Cwas stably above 1200 MPa for the alloys aged at 700 °C but continuously declined as the aging temperature increased, witha direct correlation identified between the secondary γ′-phase coarsening and strength reduction upon aging. Increasing theaging temperature transitioned the deformation mechanism from Orowan bowing around the γ′ phase to dislocation slipthrough the broadened matrix channels, leading to decreased strength. Long-term aging effectively eliminated intermediatetemperatureintergranular brittle fracture. The elongation to failure at a testing temperature of 700 °C increased by approximately35% after aging at 800 °C for 6000 h, attributed to grain-boundary diffusion of W and Mo and intragranular softening,which improved the deformation coordination ability at the grain boundaries. Finally, the precipitation of intergranular M6Cparticles after prolonged aging promoted plastic deformation via micropore aggregation.
Multiple Eavesdropper-Based Physical Layer Security in SIMO System With Antenna Correlation
( Gangcan Sun ),( Mengge Liu ),( Zhuo Han ),( Chuanyong Zhao ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.1
In this paper, we investigate the impact of antenna correlation on secure transmission in a multi-eavesdropper single-input multiple-output (SIMO) system, where the receiver and eavesdroppers are equipped with correlated antennas. Based on the practical passive eavesdropping system, the new closed-form expressions of secrecy outage probability (SOP) and non-zero secrecy capacity probability are derived to explore the effect of antenna correlation on the system with multiple eavesdroppers. To further analyze the secrecy performance of the investigated system, we theoretically derive the expression of asymptotic SOP to clearly show the diversity order and array gain. Finally, Monte Carlo simulations verify the effectiveness of our theoretical results.
Yunling Du,Yanhong Yang,Shuai Guan,Xinguang Wang,Chuanyong Cui,Jinguo Li,Yizhou Zhou,Xiaofeng Sun 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.1
A discontinuous plastic flow is detected in a single-crystal superalloy with an [001] orientation during tensile tests over a wide temperature range. Results reveals that the synergistic impact of normal γ′ precipitates and nanoscale γ′ precipitates in γ matrix on the dislocations motion is the root of the serrated flow.