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Fatigue cracking criterion of high-strength steels induced by inclusions under high-cycle fatigue

journal of Materials Science & Technology 2023年第23期154卷 114-128页

作者： peng wang peng Zhang Bin wang Yankun Zhu Zikuan Xu Zhefeng Zhang Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and Engineering University of Science and Technology of China Shenyang 110016 China

Fatigue properties of high-strength steels become more and more sensitive to inclusions with enhancing the ultimate tensile strength (UTS) because the inclusions often cause a relatively low fatigue strength and a large scatter of fatigue lives. In this work, four S–n curves and more than 200 fatigue fracture morphologies were comprehensively investigated with a special focus on the size and type of inclusions at the fatigue cracking origin in GCr15 steel with a wide strength range by different heat treatments after high-cycle fatigue (HCF). It is found that the percentage of fatigue failure induced by the inclusion including Al2 O3 and Tin gradually increases with increasing the UTS, while the percentage of failure at sample surfaces decreases conversely and the fatigue strength first increases and then decreases. Besides, it is interestingly noted that the inclusion sizes at the cracking origin for Tin are smaller than that for Al2 O3 because the stress concentration factor for Tin is larger than that for Al2 O3 based on the finite element simulation. For the first time, a new fatigue cracking criterion including the isometric inclusion size line in the strength-toughness coordinate system with specific physical meaning was established to reveal the relationship among the UTS, fracture toughness, and the critical inclusion size considering different types of inclusions based on the fracture mechanics. And the critical inclusion size of Al2 O3 is about 1.33 times of Tin. The fatigue cracking criterion could be used to judge whether fatigue fracture occurred at inclusions or not and provides a theoretical basis for controlling the scale of different inclusion types for high-strength steels. Our work may offer a new perspective on the critical inclusion size in terms of the inclusion types, which is of scientific interest and has great merit to industrial metallurgical control for anti-fatigue design.

关键词： High-strength steel High-cycle fatigue Critical inclusion size Inclusion types Tensile strength Fracture toughness Fatigue cracking criterion

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Integrated method of guidance,control and morphing for hypersonic morphing vehicle in glide phase

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Chinese journal of Aeronautics 2021年第5期34卷 535-553页

作者： Cunyu BAO peng wang Guojian TAnG College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073China

The morphing technology of hypersonic vehicle improved the flight performance by changing aerodynamic characteristics with shape deformations,but the design of guidance and control system with morphing laws remained to be *** Integrated of Guidance,Control and Morphing(IGCM)method for Hypersonic Morphing Vehicle(HMV)was developed in this *** IGCM method contributed to an effective solution of morphing characteristic to improve flight performance and reject the disturbance for guidance and control system caused by the morphing system for HMV in gliding *** IGCM models were established based on the motion models and aerodynamic models of the variable span *** the IGCM method was designed by adaptive block dynamic surface back-stepping method with stability *** parallel controlled simulations’results showed the effectiveness in accomplishing the flight mission of IGCM method in glide phase with smaller terminal *** velocity loss of HMV was reduced by 32.8%which inferred less flight time and larger terminal flight velocity than invariable span *** the condition of large deviations of aerodynamic parameters and atmospheric density,the robustness of IGCM method with variable span was verified.

关键词： Adaptive dynamic surface Glide phase Hypersonic morphing vehicle Integrated guidance control and morphing method Variable span

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Inter-facet composition modulation of III-nitride nanowires over pyramid textured Si substrates by stationary molecular beam epitaxy

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nano Research 2021年第5期14卷 1502-1511页

作者： peng wang Hedong Chen Hao wang Dan wang Changkun Song Xingyu wang Hongjie Yin Lujia Rao Guofu Zhou Richard nötzel Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou510006China national Center for International Research on Green Optoelectronics South China Normal UniversityGuangzhou510006China Department of Physics Xiamen UniversityXiamen361005China Analysis&Testing Center South China Normal UniversityGuangzhou510631China Academy of Shenzhen Guohua Optoelectronics Shenzhen518110China

InGan nanowires (nWs) are grown on pyramid textured Si substrates by stationary plasma-assisted molecular beam epitaxy (PA-MBE). The incidence angles of the highly directional source beams vary for different pyramid facets, inducing a distinct inter-facet modulation of the In content of the InGan nWs, which is verified by spatial element distribution analysis. The resulting multi-wavelength emission is confirmed by photoluminescence (PL) and cathodoluminescence (CL). Pure Gan phase formation dominates on certain facets, which is attributed to extreme local growth conditions, such as low active n flux. On the same facets, InGan nWs exhibit a morphology change close to the pyramid ridge, indicating inter-facet atom migration. This cross-talk effect due to inter-facet atom migration is verified by a decrease of the inter-facet In content modulation amplitude with shrinking pyramid size. A detailed analysis of the In content variation across individual pyramid facets and element distribution line profiles reveals that the cross-talk effect originates mainly from the inter-facet atom migration over the convex pyramid ridge facet boundaries rather than the concave base line facet boundaries. This is understood by first-principles calculations showing that the pyramid baseline facet boundary acts as an energy barrier for atom migration, which is much higher than that of the ridge facet boundary. The influence of the growth temperature on the inter-facet In content modulation is also presented. This work gives deep insight into the composition modulation for the realization of multi-color light-emitting devices based on the monolithic growth of InGan nWs on pyramid textured Si substrates.

关键词： pyramid textured Si substrate composition modulation III-nitride nanowire molecular beam epitaxy stationary growth cross talk

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Mixing of miscible shear-thinning fluids in a lid-driven cavity

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Chinese journal of Chemical Engineering 2023年第6期58卷 112-123页

作者： j.nhao wang Shugang Ma peng Chen Zhipeng Li Zhengming Gao j.j.Derksen Beij.ng Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China State Key Laboratory of Chemical Resource Engineering School of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China PetroChina Petrochemical Research Institute Beijing 102206China School of Engineering University of AberdeenAberdeen AB243UEUK

The concentration and velocity fields of two refractive index matched miscible shear-thinning fluids in a lid-driven cavity were investigated by using planar laser-induced fluorescence and particle image velocimetry,as well by computational fluid *** analyses show that the results obtained by flow simulations with the species transport model are in good agreement with the experimental *** effects of different parameters were studied by using the intensity of *** two fluids with the same rheological parameters,the relative amounts of liquids H_(1)/H and the power-law index n dominate the mixing process while the Reynolds number Re plays a marginal *** for two fluids with density difference,buoyancy has significant influence on the mixing *** dimensionless group Ar/Re(redefined such as to include shear thinning behavior)is proposed for assessing the effect of buoyancy and rheological properties on the mixing of miscible shear-thinning fluids.

关键词： Shear-thinning fluid Mixing of miscible fluids Particle image velocimetry Planar laser-induced fluorescence Species transport model Lid-driven cavity

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Systematic evaluation of advance in application and discharge mechanism of solution electrode glow discharge

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Chinese Chemical Letters 2022年第1期33卷 61-70页

作者： Xiaoxu peng Zheng wang Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

As a kind of microplasma sustained in air,solution electrode glow discharge(SEGD)ignited between the liquid electrode and metal electrode is attractive to the fields of optical emission spectrometry and mass spectrometry due to its unique advantages,such as low power consumption and low carrier gas ***,the complex and efficient reactions in the liquid phase and plasma phase of SEGD make it considerable research potential in the fields of biology and medicine,material synthesis,*** the close relationship between the various fields on SEGD,here we are devoted to provide an overview of the development of SEGD in various *** importantly,a systematic discussion on the discharge mechanism is conducted based on the research process in various fields for getting deeper insight into the SEGD.

关键词： Solution cathode glow discharge Solution anode glow discharge Mass spectrometry Optimal emission spectroscopy Discharge mechanism

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14种市售麻椒鸡的品质及风味分析

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食品工业科技 2025年第1期46卷 302-316页

作者：刘聪刘欣王鹏徐幸莲王寅李建超南京农业大学肉品质量控制与新资源创制全国重点实验室江苏南京210095 江苏立华食品有限公司江苏常州213200

为明确麻椒鸡产品的品质特性及风味特征,本研究以14种不同品牌的市售麻椒鸡(以A~n字母表示)作为研究对象,测定了其色泽、质构、剪切力、电子鼻、挥发性风味物质和电子舌,并结合感官评价进一步探究感官评价指标与仪器分析指标之间的相关... 详细信息

为明确麻椒鸡产品的品质特性及风味特征,本研究以14种不同品牌的市售麻椒鸡(以A~n字母表示)作为研究对象,测定了其色泽、质构、剪切力、电子鼻、挥发性风味物质和电子舌,并结合感官评价进一步探究感官评价指标与仪器分析指标之间的相关性。结果表明:14种麻椒鸡鸡胸的硬度范围为1742.81~4587.54 g,剪切力范围为14.41~35.07 n;鸡腿的硬度范围为797.09~3389.61 g,剪切力范围为7.70~26.34 n。电子鼻评价结果显示,14种麻椒鸡的主要挥发性气味成分为氮氧化合物、无机硫化物、有机硫化物和短链烷烃。气相色谱-离子迁移谱(GCIMS)显示,麻椒鸡风味的形成是鸡肉本身带有的香气和香辛料赋予香气整体协调的结果,14种麻椒鸡中共鉴定出77种挥发性化合物,结合正交偏最小二乘判别分析(OPLS-DA)发现,丁醛、芳樟醇、α-蒎烯、丙烯酸乙酯、α-松油醇、2-庚酮、1-辛烯-3-醇等26种物质为麻椒鸡产品的特征风味物质。电子舌评价结果显示,鲜味和咸味对麻椒鸡的滋味贡献较突出。相关性分析结果表明,感官评价中的总体喜爱度与丁醛、芳樟醇、α-蒎烯、丙烯酸乙酯、α-松油醇、2-庚酮、1-辛烯-3-醇、W5S、W1W、W2W、W1S、咸味、L^(*)和b^(*)值等指标呈现极显著正相关(P<0.01)。本研究可以为麻椒鸡产品风味品质的研究与调控、原辅料的选择、麻椒鸡产品工业化水平的提升提供参考。

关键词：麻椒鸡风味特征气相色谱-离子迁移谱品质特性相关性

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nonlinear Analysis of Bedload Transport Rate of Paroxysm Debris Flow

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四川大学学报（工程科学版） 2005年第S1期37卷 98-101页

作者： wang, Xiekang wang, Xianye Cui, peng State Key Lab. of Hydraulics and Mountain River Eng. Sichuan Univ. Chengdu 610065 China Inst. of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China

The evolution characteristics of bedload transport feature of paroxysm debris flow have been studied by means of both theory analysis and experimental *** analysis based on the flume experiment data of a sand pile model as well as a large amount of field data of debris flow clearly shown that the statistical distribu- tion for the main variable of the sand pile made of non-uniform sand (according the sand pile experiment,φ≥2.55) conform to the negative power law,that means the non-uniform sand syste...

关键词： paroxysm debris flow beclload transport rate self-organized criticality power law

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Electrical Power Generation Using Dynamic Piezoelectric Shear Deformation Under Friction

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Acta Mechanica Solida Sinica 2021年第6期34卷 977-988页

作者： peng wang Yu Xiao nan Wu Department of Mechanical Engineering Northeastern UniversityShenyang 110819China Department of Mechanical Engineering University of ManitobaWinnipeg R3T 2N2Canada

A new electrical power generation device based on high-frequency dynamic piezoelectric shear deformation under friction is *** the operation of a moving plate compressed and sliding on the top of a piezoelectric patch with constant velocity,dynamic shear deformation of the elastic piezoelectric patch is excited by periodic friction force and status(sliding and stick)*** dynamic piezoelectric shear strain can then generate continuous electrical power for energy absorbing and harvesting *** design of the piezoelectric couple device is first provided,and its mechanism,dynamic response and electric power generation under friction are described by a detailed iteration *** comparing with previous experimental results,the accuracy of the proposed model is *** numerical studies,the influences of the equivalent mass of the system,the velocity of the sliding object,the static friction coefficient and its lower limit,as well as the friction force delay rate on the power generation are obtained and *** numerical results show that with the proposed design,up to 50-Watt maximum electrical power could be generated by a piezoelectric patch with a dimension of 20×2×6 cm under continuous friction with the moving plate at the velocity of 15 m/*** possible bi-linear elastic stiffness variation of the system is also introduced,and the threshold of bi-linear elastic deformation,where the system stiffness changes,can be optimized for obtaining the highest power generation.

关键词： Electrical power generation Friction Piezoelectric shear deformation Sliding and stick Bi-linear

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Recent advances in chemical durability and mechanical stability of superhydrophobic materials: Multi-strategy design and strengthening

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journal of Materials Science & Technology 2022年第34期129卷 40-69页

作者： peng wang Changyang Li Dun Zhang Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100039China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and TechnologyQingdao 266237China

Inspired by the lotus leaf effect, non-wetting artificial superhydrophobic surfaces demonstrate an enormous potential in numerous fields. However, limited by poor stability and durability, superhydrophobic surfaces are rarely available for practical applications. In this review, based on the wettability mechanisms and failure modes of superhydrophobic surfaces, it is proposed that the construction of highly stable superhydrophobic materials can be approached from four aspects, including structural design, chemical bonding, interfacial-strengthening of hydrophobic materials and substrates, and self-healing. We introduced in detail the design ideas, strengthening approaches, and characterization tools of highly stable superhydrophobic materials from the perspective of multi-strategy design and strengthening, and provided corresponding insights. Eventually, the development, current status, and prospects of highly stable and multifunctional superhydrophobic materials were also presented in detail. Recent advances and development prospects of durable superhydrophobic materials were summarized and discussed in this review,providing certain insights and design guidelines for the fabrication of stable superhydrophobic materials.

关键词： Superhydrophobicity Stability Durability Strengthening

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Performance analysis of diffusion-based decode-and-forward relay with depleted molecule shift keying

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Digital Communications and networks 2021年第3期7卷 399-409页

作者： jiaxing wang Mugen peng Yaqiong Liu State Key Laboratory of networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing100876China School of Electronic and Control Engineering North China Institute of Aerospace Engineering.Langfang Aerospace Testing Technology and Instrument Research and Development CenterLangfang065000China

The distance-decay effect of molecular signals makes communication range a major challenge for diffusion-based Molecular Communication(MC).To solve this problem,the intermediate nano-machine is deployed as a relay between the transmitter and its intended receiver *** this work,we employ the Depleted Molecule Shift Keying(D-MoSK)to model a Decode-and-Forward(DF)relay communication *** closed-form expression of Bit Error Rate(BER)for the concerned DF relay with D-MoSK is ***,the maximum a posteriori probability,minimum error probability,and maximum likelihood schemes are formulated for data *** relationships between BER and other key parameters,including the number of released molecules,receiving radius,and relay position,are investigated in *** results show that the proposed scheme can improve communication reliability ***,the performance gain can be maximized by optimizing the position of the relay and the receiving radius.

关键词： Diffusion Molecular communication Decode-and-Forward relay Bit error rate

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