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Fracture mode identification of low alloy steels and cast irons by electron back-scattered diffraction misorientation analysis

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Journal of Materials Science & Technology 2017年第12期33卷 1582-1595页

作者： shao-Shi Rui Yi-Bo shang Wenhui Qiu li-sha niu Hui-Ji Shi Shunsaku Matsumoto Yasuharu Chuman Applied Mechanics Laboratory School of Aerospace EngineeringTsinghua UniversityBeijing 100084China Residential Air Conditioning Division MIDEAFoshan528311China Strength Research Department Research&Innovation CenterMitsubishi Heavy IndustriesLtd.Nagasaki 851-0392Japan

The fracture modes of low alloy steels and cast irons under tensile and fatigue conditions were identified by electron back-scattered diffraction（EBSD） misorientation analysis in this research. The curves of grain reference orientation deviation（GROD） distribution perpendicular to the fracture surface were obtained by EBSD observation, and the characteristics of each fracture mode were identified. The GROD value of the specimen fractured in tension decreases to a constant related to the elongation of corresponding specimen in the far field（farther than 5 mm away from the fracture surface）. The peak exhibits in GROD curves of two smooth specimens and a notched specimen near the fracture surface（within 5 mm away from the fracture surface）, and the formation mechanisms were discussed in detail based on the influences of specimen geometries（smooth or notched） and material toughness. The GROD value of fatigue fractured specimen is close to that at undeformed condition in the whole field, except the small area near the crack path. The loading conditions（constant stress amplitude loading or constant stress intensity factor range K loading） and the EBSD striation formation during fatigue crack propagation were also studied by EBSD observation parallel to the crack path.

关键词： Fracture mode identification Low alloy steels Cast irons Electron back-scattered diffraction (EBSD) Misorientation

Microstructure and Mechanical Property of Mg‑13Gd‑0.2Ni Alloy Processed by Extrusion and Aging

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Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1367-1376页

作者： Hang Zhang Jiaying Zhao Rongguang li Boshu liu shanshan li sha sha Yuehong Zhang Man Xu Yan Tang School of Mechanical and Power Engineering Shenyang University of Chemical TechnologyShenyang 110142China Instrumental Analysis Center Shenyang University of Chemical TechnologyShenyang 110142China

In this work,a good combination of strength and ductility is achieved in a Mg-13Gd-0.2Ni alloy by conventional extrusion and following aging *** aged Mg-13Gd-0.2Ni alloy exhibits a yield strength(YS)of 363 MPa,an ultimate tensile strength(UTS)of 433 MPa,and an elongation of 11.9%.The aged Mg-13Gd-0.2Ni alloy contains a microstructure with a 95%proportion of dynamically recrystallized(DRXed)grains with a micron size,weak texture,and a high number density of prismaticβ′precipitates within *** bulk compounds enriched with Ni element which are mainly formed during casting and stable in the extruded and aged *** dynamic compounds are formed during extrusion,and a high density of prismaticβ′precipitates are formed during *** high density of prismaticβ′precipitates results in a significant increase in the strength of the Mg-13Gd-0.2Ni alloy,and the YS and UTS are increased by 153 and 136 MPa,*** high proportion of DRXed grains with a weak texture contributes mainly to the high ductility and the fine compounds with a low density at grain boundaries formed during aging have no significant adverse effect on ductility of the aged Mg-13Gd-0.2Ni *** findings for the novel Mg-Gd-Ni alloy can provide guidance for the design of wrought Mg alloys with superior mechanical properties.

关键词： Mg-Gd-Ni alloy Extrusion Aging Strength Ductility

A Web-like Three-dimensional Binder for Silicon Anode in lithium-ion Batteries

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Energy & Environmental Materials 2024年第1期7卷 21-27页

作者： liyuan li Tao li Yifan sha Baozeng Ren Lan Zhang Suojiang Zhang CAS Key Laboratory of Green Process and Engineering Beijing Key Laboratory of Ionic Liquids Clean ProcessState Key Laboratory of Multiphase Complex SystemsInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China Langfang Green Industrial Technology Center Langfang 065001China Henan Key Laboratory of Energy Storage Materials and Processes Zhengzhou Institute of Emerging Industrial TechnologyZhengzhou 450003China

Si anode is of paramount importance for advanced energy-dense lithium-ion batteries(liBs).However,the large volume change as well as stress generates during its lithiation-delithiation process poses a great challenge to the long-term cycling and hindering its *** this work,a composite binder is prepared with a soft component,guar gum(GG),and a rigid linear polymer,anionic polyacrylamide(APAM).Rich hydroxy,carboxyl,and amide groups on the polymer chains not only enable intermolecular crosslinking to form a web-like binder,A2G1,but also realize strong chemical binding as well as physical encapsulating to Si *** resultant electrode shows limited thickness change of merely 9%on lithiation and almost recovers its original thickness on *** demonstrates high reversible capacity of 2104.3 mAh g^(-1)after 100 cycles at a current density of 1800 mA g^(-1),and in constant capacity(1000 mAh g^(-1))test,it also shows a long life of 392 ***,this soft-hard combining web-like binder illustrates its great potential in the future applications.

关键词： anionic polyacrylamide lithium-ion batteries Si anode thickness change web-like binder

Stochastic uncertain lubrication in gear transmission subjected to tribodynamic loading

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Friction 2024年第8期12卷 1741-1756页

作者： Zhou CHEN Haiming sha Sheng li Zheming TONG Shuiguang TONG State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China School of Mechanical Engineering Zhejiang UniversityHangzhou 310027China Wright State University 3640 Colonel Glenn HighwayDaytonOH 45435USA

A stochastic uncertain tribodynamic model is established for a spur gear pair for the first *** stochastic uncertainty of pinion rotation speed propagated to lubrication performance is *** probability density function of the minimum lubricant film thickness hmin evolves over time periodically at interval of an engagement *** between abrupt increase in meshing force and amplification of hmin uncertainty is *** and reliable lubrication performance can be achieved by suppressing the hmin uncertainty and decreasing the lubrication failure *** can be done by increasing lubricant viscosity,and decreasing input torque and uncertainty level of input rotation *** work lays a solid foundation for robust and reliability based optimization for tribodynamic gear system.

关键词： stochastic uncertainty gears elastohydrodynamic lubrication(EHL) tribodynamics

Crystal plasticity finite element simulation of fretting fatigue crack formation in Ni-base single-crystal superalloys

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Crystal plasticity finite element simulation of fretting fat...

Characterization of Domeless receptors and the role of Bd Domeless3 in anti-symbiont-like virus defense in Bactrocera dorsalis

力学与工程——数值计算和数据分析2019学术会议

作者： Qi-Nan Han li-sha niu Hui-Ji Shi Department of Engineering Mechanics Tsinghua University Aircraft Strength Research Institute of China

Fretting fatigue behavior of Ni-base single crystal(NBSX) superalloys was investigated based on crystal plasticity finite element method(CPFEM) simulation. Crystal plasticity constitutive model considering cyclic hardening effect was employed. CPFEM simulation showed the activations of crystallographic slip systems at contact region. The slip plane with the maximum plastic slip was determined as dominate slip plane. Equivalent plastic strain was proved effective to predict crack initiation. The simulation results including predicted slip lines, crack initiation locations and orientations were in good agreements with observations.

关键词： fretting fatigue crystal plasticity slip lines single-crystal superalloy

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Journal of Integrative Agriculture 2024年第4期23卷 1274-1284页

作者： Wei Zhang shaoyang li Rong li Jinzhi niu Jinjun Wang Key Laboratory of Entomology and Pest Control Engineering College of Plant ProtectionSouthwest UniversityChongqing 400715China Key Laboratory of Agricultural Biosafety and Green Production of Upper Yangtze River Ministry of Education/International Joint Laboratory of China-Belgium on Sustainable Crop Pest ControlAcademy of Agricultural SciencesSouthwest UniversityChongqing 400715China

The Janus kinase/signal transducers and activators of transcription(JAK/STAT)signaling pathway play a pivotal role in innate *** invertebrates,Domeless receptors serve as the key upstream regulators of this *** our study on Bactrocera dorsalis,we identified three cytokine receptors:BdDomeless1,BdDomeless2,and *** receptor encompasses five fibronectin-type-III-like(FN III)extracellular domains and a transmembrane ***,these receptors exhibit the increased responsiveness to diverse pathogenic ***,only BdDomeless3 is upregulated during symbiont-like viral ***,silencing BdDomeless3 enhanced the infectivity of Bactrocera dorsalis cripavirus(BdCV)and *** picorna-like virus(BdPLV),underscoring BdDomeless3’s crucial role in antiviral defense of *** the suppression of Domeless3 expression,six antimicrobial peptide genes displayed decreased expression,potentially correlating with the rise in viral *** our knowledge,this is the first study identifying cytokine receptors associated with the JAK/STAT pathway in tephritid flies,shedding light on the immune mechanisms of ***.

关键词： Bactrocera dorsalis JAK/STAT pathway Domeless receptors antiviral immunity symbiont-like virus

Sustainable Intensification and Large-scale Operation of Cultivated Land Use at the Farmers’ Scale:A Case Study of shandong Province,China

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Chinese Geographical Science 2024年第1期34卷 149-167页

作者： li li LYU Xiao ZHANG Anlu niu shandong PENG Wenlong School of Public Administration Huazhong Agricultural UniversityWuhan430070China Department of Geography University of ZurichZurich8057Switzerland School of Humanities and Law Northeastern UniversityShenyang110169China School of Geography and Tourism Qufu Normal UniversityRizhao276800China

Sustainable intensification of cultivated land use(SICLU) and large-scale operations(LSO) are widely acknowledged strategies for enhancing agricultural ***,the existing literature has faced challenges in precisely defining SICLU and constructing comprehensive indicators,which has hindered the exploration of factors influencing LSO within the SICLU *** address this gap,we integrated self-efficacy theory into the design of an index framework for evaluating *** subsequently employed econometric models to analyze the significant factors that impact *** findings reveal that SICLU can be divided into four key dimensions:intensive management,efficient output,resource conservation,and ecological environment ***,it is crucial to incorporate belief-based cognitive factors into the index system,as farmers’ understanding of fertilizer and pesticide application significantly influences their willingness to engage in ***,we identify grain market turnover as the most influential factor in promoting LSO,with single-factor contribution rates reaching 70.9% for cultivated land transfer willingness and 62.5% for the total planting ***,unlike irrigation and agricultural machinery inputs,increased labor inputs correspond to larger planting areas for *** trend may be attributed to reduced labor availability because of rural labor migration,whereas the reduction in irrigation and agricultural input is contingent on innovations in production practices and the transfer of cultivated land management ***,SICLU dynamically influences LSO,with each index related to SICLU having an optimal range that fosters *** insights offer valuable guidance for policymakers,emphasizing farmers as their central focus,with the adjustment of input and output factors as a means to achieve LSO as the ultimate *** conclusion,we propose research avenues for further enriching the SICLU framework to ensur

关键词： sustainable intensification of cultivated land use(SICLU) self-efficacy status quo bias input and output Boosted Regression Tree willingness to transfer cultivated land cultivated land planting areas shandong,China

Neuroprotective Effect and Mechanism of Tanreqing Injection on Ischemic Stroke:Insights from Network Pharmacology and in vivo Experiments

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Chinese Journal of Integrative Medicine 2024年第8期30卷 713-720页

作者： li Zhong-hao PU Xiao-qi li sha-sha DONG Xiao-ke ZHANG Guo-qiang WANG Yu liU Jin-min Department of Emergency China-Japan Friendship HospitalBeijing100029China Department of Neurology Beijing University of Chinese Medicine Dongfang HospitalBeijing100078China Department of Radiology China-Japan Friendship HospitalBeijing100029China Graduate School Beijing University of Chinese MedicineBeijing100029China

Objective To explore the neuroprotective effects and mechanism of Tanreqing Injection(TRQ)on treating ischemic stroke based on network pharmacology and in vivo experimental *** The chemical compounds of TRQ were retrieved based on published data,with targets retrieved from PubChem,Therapeutic Target Database and *** visualization and analysis were performed using Cytoscape,with protein-protein interaction networks derived from the STRING *** analysis was performed using Kyoto Encyclopedia of Genes Genomes pathway and Gene Ontology *** in vivo experiments,the middle cerebral artery occlusion(MCAO)model was *** volume was determined by 2,3,5-triphenyltetrazolium hydrochloride staining and protein expressions were analyzed by Western *** docking was performed to predict ligand-receptor *** We screened 81 chemical compounds in TRQ and retrieved their therapeutic *** the targets,116 were therapeutic targets for *** enrichment analysis showed that the apelin signaling pathway was a key pathway for ischemic ***,in in vivo experiment we found that administering with intraperitoneal injection of 2.5 mL/kg TRQ every 6 h could significantly reduce the infarct volume of MCAO rats(Plin receptor(APJ)/phosphatidylinositol 3-kinase(PI3K)/protein kinase B(AKT)pathway were increased by TRQ(Pling ***,further studies are needed to confirm the findings.

关键词： Tanreqing Injection Chinese medicine ischemic stroke middle cerebral artery occlusion quantitative estimate of drug-likeness

Effects of surface energy and substrate on modulus determination of biological films by conical indentation

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Science China(Technological Sciences) 2024年第6期67卷 1757-1764页

作者： DING Yue li Cheng-Ya niu XinRui WANG Gang-Feng Department of Engineering Mechanics SVLXi’an Jiaotong UniversityXi’an710049China Department of Mechanical Engineering City University of Hong KongHong Kong SAR999077China

Micro-/nano-indentation has become prevalent in evaluating the mechanical characteristics of biological samples,such as cells and ***,the existing contact models describing conical indentation ignore the joint effects of surface energy and substrate,and consequently cannot accurately extract the Young's modulus of biological samples deposited on *** finite element methods,we examine the conical indentation of biological films on substrates while taking surface energy into *** on the dimensional analysis,the explicit relationship between load and indentation depth is achieved for films with their moduli varying from 0.001 to 100 times that of the *** the classical Sneddon's model was employed to analyze the load-depth data,the measured modulus could reach 18 times the real modulus for films on harder substrates,but only 4%of the real modulus for films on softer ***,in micro-/nano-indentations,neglecting the contribution of surface energy would result in an overestimation of the Young's modulus of films depending on the contact *** analytical expression provided here can be utilized to precisely deduce the mechanical characteristics of biological films deposited on substrate from the load and indentation depth data of a conical indentation.

关键词： biological film surface effect substrate effect indentation