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Investigation into the stress-strain compatibility and fracture behaviour of a TC18 titanium alloy with a multistage lamellar microstructure

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Progress in Natural Science:Materials International 2024年第5期34卷 1039-1048页

作者： Zhongxiang Li Zhaoxin Du Jun Cheng zhiyong yue Tianhao Gong Xudong Kang Yongcheng Zhu School of Materials Science and Engineering Inner Mongolia University of Technology Collaborative Innovation Center of Non-ferrous Metal Materials and Processing Technology Co-constructed By the Province and Ministry Inner Mongolia Autonomous Region Inner Mongolia University of Technology Northwest Institute for Nonferrous Metal Research Shanxi Key Laboratory of Biomedical Metal Materials School of Mechanical Engineering Inner Mongolia University of Technology

Understanding the fracture mechanism is essential for optimizing the mechanical properties of titanium *** relationship between fracture behaviour and the multistage lamellar microstructure of the TC18(Ti–5Al–5Mo–5V–1Cr–1Fe) alloy was investigated via in situ tensile and three-point bending tests. The results indicate that the TC18 alloy, featuring a multistage lamellar microstructure(including a β matrix, primary lamellar α phase, bundles, and secondary lamellar α phase), exhibits an excellent combination of strength and ductility. The precipitation of the secondary lamellar α phase significantly enhances the alloy's strength but weakens the stress-strain compatibility of the microstructure. This results in a smaller crack-tip plastic zone(CTPZ) and causes dislocations to concentrate more at the grain boundaries and, to a lesser extent, at the phase interfaces. Consequently, in the later stages of crack propagation, microvoids and microcracks tend to form at dislocation pile-ups. With increasing stress, these microvoids and microcracks rapidly coalesce, leading to a greater proportion of intergranular fracture and thus reducing the fracture toughness of the alloy.

关键词： TC18titanium alloys In situ stretching Crack-tip plastic zone (CTPZ) Stress‒strain compatibility Fracture behaviour

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Grain refinement and phase precipitation simultaneously improve the strength and ductility of ultra-high strength titanium alloy sheets

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Progress in Natural Science:Materials International 2024年第5期34卷 1066-1075页

作者： Xudong Kang Zhaoxin Du Shaojun Wang Jun Cheng zhiyong yue Tianhao Gong Jingshun Liu Shuzhi Zhang School of Materials Science and Engineering Inner Mongolia University of Technology Collaborative Innovation Center of Non-ferrous Metal Materials and Processing Technology Co-constructed by the Provience and Ministry Inner Mongolia Autonomous Region Inner Mongolia University of Technology Northwest Institute for Non-Ferrous Metal Research Shanxi Key Laboratory of Biomedical Metal Materials College of Mechanical Engineering Inner Mongolia University of Technology State Key Laboratory of Metastable Materials Science and Technology Yanshan University

The simultaneous high strength and high plasticity of metastable-β titanium alloy sheets remains a difficult challenge. In this work, a 1.2 mm thick sheet of Ti–15Mo–3Al-2.7Nb-0.25Si titanium alloy was obtained after rolling and annealing, and then subjected to a duplex-ageing treatment. The pre-ageing temperatures fell in the range of 300–390°C for 0.5–2h. The re-ageing temperatures were in the range of 500–600°C. After characterization, it was found that the alloy precipitates ω-phases during the pre-ageing process, and the distribution of such ω-phases evolves unevenly and increases in number with the increase of the pre-ageing ***, the strengthening mechanism of the alloy sheet is mainly α-phase nucleation assisted by ω-***, grain refinement appears as a mechanism to ensure the plasticity of the alloy. Finally the ω-phase evolution law is discussed in detail and the strengthening mechanism of the alloy sheet is also analyzed. At this work, a metastable-β titanium alloy sheet with strength of 1445.75 MPa and elongation of 6.55 % was *** study provides a new idea for the microstructure design and process improvement of the metastable-β titanium alloy sheet.

关键词： Metastable-β titanium Duplex-ageing treatment ω-phase Strengthening mechanism

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Dynamics of risers for earthquake resistant designs

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Petroleum Science 2010年第2期7卷 273-282页

作者： Duan Menglan Wang Yi yue zhiyong Estefen Segen Yang Xiaogang School of Naval Architecture and Marine Engineering Dalian University of Technology Dalian Liaoning 116024 China Offshore Oil/Gas Research Center China University of Petroleum Beijing 102249 China Department of Mechanics and Engineering Peking University Beijing 100080 China COPPE Federal University of Rio de Janeiro EO.Box 68508 RJ 21945-970 Brazil Design Division CNOOC Engineering Tanggu Tianjin 300452 China

It is well known that no criterion about seismic design for risers is available, and relevant research has not been reported. A comprehensive study of riser dynamics during earthquakes is performed in this paper. A dynamic model for seismic analysis of risers is developed in accordance with the working environment of the risers and the influence of inertia force of the pipelines. The dynamic equations for the developed model are derived and resolved on the basis of the energy theory of beams. Numerical simulation for an engineering project in the Bohai Oil Field, China shows that the fundamental frequency of the riser plays the major role in the seismic responses, and for platforms in shallow water in Bohai Bay, the risers demonstrate a much lower stress response due to prominent differences between the riser frequency and the earthquake wave frequency. The presented model and its corresponding method for seismic analysis are practical and important for riser design resistant to earthquake waves.

关键词： Subsea pipeline riser seismic design dynamic response earthquake wave Hamilton theory

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低温等离子刀治疗慢性鼻炎对鼻气道阻力的影响

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临床耳鼻咽喉科杂志 2005年第8期19卷 347-348页

作者：岳志勇张大良山东大学山东省立医院耳鼻咽喉科济南250021 山东大学第二医院耳鼻咽喉科

目的:观察低温射频等离子刀治疗慢性肥厚性鼻炎对鼻气道阻力的影响。方法:应用主动性前鼻测压法,测定82例慢性肥厚性鼻炎患者低温射频等离子术术前及术后3、10个月的鼻气道阻力;并应用主观视觉10分评分表评定患者术前及术后3、10个月鼻... 详细信息

目的:观察低温射频等离子刀治疗慢性肥厚性鼻炎对鼻气道阻力的影响。方法:应用主动性前鼻测压法,测定82例慢性肥厚性鼻炎患者低温射频等离子术术前及术后3、10个月的鼻气道阻力;并应用主观视觉10分评分表评定患者术前及术后3、10个月鼻开放感觉评分请况。结果:鼻炎组术前鼻气道阻力为(0.665±0.21)kPa/(s·L);术后3个月为(0.301±0.16)kPa/(s·L),10个月为(0.391±0.24)kPa/(s·L);术后3个月和10个月分别与术前比较,差异有统计学意义(均P<0.01)。术前主观鼻开放感觉评分为7.5±1.5,术后3个月为2.0±2.0,10个月为3.0±2.5,术后3个月和10个月分别与术前比较,差异亦有统计学意义(均P<0.01)。结论:低温射频等离子术治疗慢性肥厚性鼻炎可显著降低患者的鼻气道阻力,同时可明显改善患者的主观鼻开放感觉。

关键词：鼻炎低温射频等离子刀鼻气道阻力

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“十四五”时期文物安全形势、问题与对策

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中国文化遗产 2022年第3期109卷 70-76页

作者：岳志勇国家文物局北京100009

党中央、国务院对全面加强文物安全工作提出新的更高要求,为解决长期以来文物安全管理存在的突出问题、改善文物安全状况、提高文物安全防护能力提供了重大机遇。当前,文物安全依然面临着文物法人违法、盗窃盗掘文物犯罪、文物火灾事故... 详细信息

党中央、国务院对全面加强文物安全工作提出新的更高要求,为解决长期以来文物安全管理存在的突出问题、改善文物安全状况、提高文物安全防护能力提供了重大机遇。当前,文物安全依然面临着文物法人违法、盗窃盗掘文物犯罪、文物火灾事故、违规施工、自然灾害和极端气候事件等诸多风险和挑战,存在着一些地方文物安全意识淡漠、安全责任落实不到位、安消防设施建设亟待加强、风险监测预警应急处置能力亟待提升等明显问题。防范化解文物安全风险,必须牢牢把握高质量发展主题,全面贯彻落实新发展理念,着力从加强党的全面领导,落实政府主体责任;加强文物法治建设,提升文物执法效力;加强部门协作,建立联合监管长效机制;加强安全设施建设,提高技术防范能力;加强科技支撑,全面提升文物安全预警防控能力等方面制定相应对策措施,夯实文物安全责任,筑牢文物安全底线。

关键词：十四五文物安全文物火灾盗窃盗掘文物防灾减灾文物执法

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Wide audio-frequency driving vibration used in non-destructive testing on laminated composite components

Wide audio-frequency driving vibration used in non-destructi...

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实验力学国际会议

作者： Yunwen Qin zhiyong yue Xinhua Ji Yanping Bai Dept.of Mechanics Tianjin University Tianjin China

＜正＞ In this paper, we present an ESSPI-based method for non-destructive testing of laminated composite using wide audiofrequency driving vibration. This method is simple to operate and has many advantages over othe... 详细信息

关键词： ESSPI wide audio-frequency driving vibration laminated composite NDT

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Effects of harvesting time and processing on the contents of five alkaloids in the herbaceous stems of Ephedra sinica

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Journal of Chinese Pharmaceutical Sciences 2019年第5期28卷 339-347页

作者： Wen Zhang Kangfei Duan Mingying Shang Meng Guan Deyun Li Zongli Bai zhiyong yue Shaoqing Cai Department of Natural Medicines School ofPharmaceutical SciencePeking University Health Science CenterBeijing 100191China China Meheco Group Co. Ltd.Beijing 100061China Kangmei Pharmaceutical Co. Ltd.Puning 515300China

In the present study,we studied the changes of the contents of alkaloids in the herbaceous stems of Ephedra sinica during different harvest periods as well as before and after *** alkaloid contents of 39 batches of ephedra herb,prepared slices ephedra and honey-fried ephedra,24 batches of ephedra herb with different harvesting periods,which were all collected from cultivation base in Inner Mongolia,and 38 batches of prepared slices ephedra purchased from the market were detected by taking norephedrine(NE),norpseudoephedrine(NPE),ephedrine(E),pseudoephedrine(PE)and methylephedrine(ME)as indicators by using HPLC *** content of total alkaloid in prepared slices ephedra(1.71%–3.14%)was higher than that in ephedra herb(1.20%–2.53%)and honey-fried ephedra(1.52%–2.99%).Contents of different alkaloids in these three types of samples were significantly *** slices ephedra and honey-fried ephedra showed significant differences in the contents of NE,NPE and ME(P<0.05),and the contents of E were significantly different between ephedra herb and honey-fried ephedra(P<0.05).The total alkaloid content of ephedra herb was the highest in September(3.10%).Alkaloid contents of prepared slices ephedra collected in the market were uneven and 13%–91%lower than those collected from cultivation *** results provided a basis for the quality evaluation of ephedra herb and its processed products,and had certain guiding significance for the selection of processed ephedra according to different drug purposes in clinical *** also provided data support for the harvesting time of ephedra herb.

关键词： Ephedra sinica Alkaloid Ephedra herb Prepared slices ephedra Honey-fried ephedra HPLC

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海底管线抗震设计的极限地震应力计算法

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应用力学学报 2006年第3期23卷 440-446页

作者：孙政策段梦兰张文岳志勇贾旭粟京长江大学复旦大学上海200433 COPPE Federal University of Rio de JaneiroRJ68501 Brazil 复旦大学北京大学中海石油研究中心

针对现用海底管线地震应力计算时存在的计算应力过大、管线几何参数和埋设深度对计算结果几乎没有影响等问题,在考虑了海底管线实际埋设环境的基础上,通过理论分析,给出了考虑地震时管线周围约束土壤进入塑性滑移状态后的极限地震应力... 详细信息

针对现用海底管线地震应力计算时存在的计算应力过大、管线几何参数和埋设深度对计算结果几乎没有影响等问题,在考虑了海底管线实际埋设环境的基础上,通过理论分析,给出了考虑地震时管线周围约束土壤进入塑性滑移状态后的极限地震应力计算方法,来计算海底埋设管线在地震作用下所产生的最大地震应力。用该新方法分析了一实际管线工程的地震应力,并通过与现用方法计算结果的比较,证明该方法克服了现用设计方法仅考虑管土之间为弹性约束、管线几何尺寸对抗震设计影响很小等问题,有效反映了实际铺设环境对海底管线地震应力的作用。本文应用极限地震应力计算法,结合工程实例计算,进一步明确了管线几何参数和埋设深度对极限地震应力的影响规律,为准确计算海底管线的地震应力、制定海底管线抗震规范、进行已服役海底管线的地震风险评估和寿命预测奠定了基础。

关键词：海底管线抗震设计剪切强度极限应力塑性约束滑移

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地震波作用下海底管线弯管抗震设计方法

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石油学报 2008年第1期29卷 143-148页

作者：段梦兰岳志勇崔玉军贾旭孙政策中国石油大学海洋油气研究中心北京102249 北京大学力学与工程科学系北京100871 中海石油研究中心北京100027 复旦大学力学与工程科学系上海200433

根据海底管道铺设环境的实际情况,建立了海底管道简单弯管的力学模型,并用地震最大加速度法求得包含1个动力安全系数的工程设计计算公式。用加速度时程曲线法对弯管的动力学方程进行了数值计算,同时使用有限元软件验证了数值计算结果,... 详细信息

根据海底管道铺设环境的实际情况,建立了海底管道简单弯管的力学模型,并用地震最大加速度法求得包含1个动力安全系数的工程设计计算公式。用加速度时程曲线法对弯管的动力学方程进行了数值计算,同时使用有限元软件验证了数值计算结果,为动力安全系数的选择提供了依据。

关键词：地震波海底管线弯管设计方法力学模型数值计算

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大型航天器动力学试验验证技术进展

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中国科学：物理学、力学、天文学 2019年第2期49卷 31-39页

作者：张俊刚何玲高海洋刘明辉岳志勇北京卫星环境工程研究所北京100094

航天器在发射过程要经受严酷的动力学环境,为保证航天器发射和在轨运行的可靠性,必须在地面开展相关的动力学环境试验验证.以我国空间站为代表的大型航天器与以往的卫星产品相比,尺寸和质量大幅增加,原有的试验方法及试验设备不能满足... 详细信息

航天器在发射过程要经受严酷的动力学环境,为保证航天器发射和在轨运行的可靠性,必须在地面开展相关的动力学环境试验验证.以我国空间站为代表的大型航天器与以往的卫星产品相比,尺寸和质量大幅增加,原有的试验方法及试验设备不能满足地面力学试验验证的需求,如何开展地面力学试验并保证其有效性等问题是亟需解决的关键技术.本文介绍了我国飞船、空间站等大型航天器动力学试验验证技术的发展成果,包括动力学试验方法、振动试验静载补偿技术,分析了分段试验技术的可行性,以及大型力学试验设备研制的可行性和技术难点等,并对未来大型航天器地面力学试验验证技术的发展进行展望.

关键词：航天器动力学试验试验技术试验设备

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