Search | Engineering

订阅投稿

首页工程期刊工程焦点工程成就工程前沿关于我们 English

资源类型

期刊论文 436

会议视频 6

年份

2023 26

2022 32

2021 35

2020 16

2019 39

2018 17

2017 14

2016 18

2015 23

2014 13

2013 14

2012 14

2011 19

2010 29

2009 31

2008 35

2007 22

2006 9

2005 2

2004 2

展开︾

关键词

复合材料 5

高压 3

PP 2

力学性能 2

加压浸出 2

压力容器技术 2

工程水压爆破 2

泥水盾构 2

渗透汽化 2

组合梁 2

BMI树脂 1

CCS 1

CO₂分离 1

COVID-19 1

DX桩 1

EFP 1

HDPE 1

S 特性 1

S型钢丝研制 1

展开︾

检索范围：

排序：展示方式：

Theoretical study of failure in composite pressure vessels subjected to low-velocity impact and internalpressure

Roham RAFIEE, Hossein RASHEDI, Shiva REZAEE

《结构与土木工程前沿（英文）》 2020年第14卷第6期页码 1349-1358 doi: 10.1007/s11709-020-0650-3

摘要： A theoretical solution is aimed to be developed in this research for predicting the failure in internally pressurized composite pressure vessels exposed to low-velocity impact. Both in-plane and out-of-plane failure modes are taken into account simultaneously and thus all components of the stress and strain fields are derived. For this purpose, layer-wise theory is employed in a composite cylinder under internal pressure and low-velocity impact. Obtained stress/strain components are fed into appropriate failure criteria for investigating the occurrence of failure. In case of experiencing any in-plane failure mode, the evolution of damage is modeled using progressive damage modeling in the context of continuum damage mechanics. Namely, mechanical properties of failed ply are degraded and stress analysis is performed on the updated status of the model. In the event of delamination occurrence, the solution is terminated. The obtained results are validated with available experimental observations in open literature. It is observed that the sequence of in-plane failure and delamination varies by increasing the impact energy.

关键词： composite pressure vessel low-velocity impact failure theoretical solution progressive damage modeling

HTML PDF 收藏

压力容器分析设计中基于“处理面”的等效线性化方法

尹益辉,余绍蓉

《中国工程科学》 2008年第10卷第10期页码 31-35

摘要：

从球形压力容器在内压作用下的解析解出发进行分析，指出在现有著作和规范中，直接对沿壳体厚度变化的应力表达式沿壳体厚度的一条“处理线”进行一维积分求解厚壁球壳壁上的薄膜应力和弯曲应力的方法在概念上不够准确，会导致一定的额外误差。由此提出了在壳体的环形截面区域的一个“处理面”上进行二维积分来求解壳壁上的薄膜应力和弯曲应力的方法，在概念上是准确的，能够避免“处理线”法导致的额外误差。通过一个受内压厚壁球壳的弹性解析计算，说明新方法比原方法有明显的改进。

关键词：压力容器分析设计应力分类等效线性化方法

HTML PDF 收藏

中国开创的抗爆钢复合材料压力容器技术

朱国辉

《中国工程科学》 2000年第2卷第6期页码 8-11

摘要：

压力容器是一种应用广泛的重要工程装置。大型压力贮罐、氨合成塔、尿素合成塔、石油加氢反应器、导弹壳体和液氢、液氧燃料压力容器，以及核堆压力壳等是国际上公认的高科技重大承压装备。纤维复合材料和普通钢制是当今世界压力容器技术的两大种类。作者开创了一种新的具有优良综合特性，已含国家发明奖励和18项中美专利成果的抗爆钢复合材料压力容器技术，使压力容器的使用安全性和制造经济性发生了极大的变革；其典型代表钢带缠绕式压力容器，已被美国机械工程师学会正式列入ASME标准，居国际领先水平，将为21世纪国际压力容器的设计、制造和安全保障技术的发展开创出新的局面。

关键词：压力容器技术纤维复合材料钢复合材料复合薄内筒交错缠绕全双层结构抑爆抗爆

HTML PDF 收藏

钢复合结构压力容器技术

朱国辉,朱立,郑津洋,郑传祥,陈志平,吴红梅

《中国工程科学》 2001年第3卷第7期页码 79-84

摘要：

对压力容器设计提出了一种技术先进的多功能壳和长远发展根本要求的新理念，并介绍了钢复合结构压力容器技术的四项新的专利技术发展体系。钢复合结构压力容器技术是一种国际创新的，涵盖各种高、中、低压，应用范围广阔的压力容器新技术。其主要特点是具抑爆抗爆、简化制造、分散缺陷和可实现经济可靠的在线安全状态自动监控等多功能壳特性，可降低制造成本30%～50%。

关键词：压力容器技术钢复合结构多功能壳钢带错绕全双层抑爆抗爆

HTML PDF 收藏

Bioaerosol: A Key Vessel between Environment and Health

《环境科学与工程前沿（英文）》 2021年第15卷第3期 doi: 10.1007/s11783-021-1422-6

HTML PDF 收藏

Development of lunar regolith-based composite for - 3D printing via high-pressure extrusion system

《机械工程前沿（英文）》 2023年第18卷第2期 doi: 10.1007/s11465-022-0745-8

摘要： To fully utilize the in-situ resources on the moon to facilitate the establishment of a lunar habitat is significant to realize the long-term residence of mankind on the moon and the deep space exploration in the future. Thus, intensive research works have been conducted to develop types of 3D printing approach to adapt to the extreme environment and utilize the lunar regolith for in-situ construction. However, the in-situ 3D printing using raw lunar regolith consumes extremely high energy and time. In this work, we proposed a cost-effective melting extrusion system for lunar regolith-based composite printing, and engineering thermoplastic powders are employed as a bonding agent for lunar regolith composite. The high-performance nylon and lunar regolith are uniformly pre-mixed in powder form with different weight fractions. The high-pressure extrusion system is helpful to enhance the interface affinity of polymer binders with lunar regolith as well as maximize the loading ratio of in-situ resources of lunar regolith. Mechanical properties such as tensile strength, elastic modulus, and Poisson’s ratio of the printed specimens were evaluated systematically. Especially, the impact performance was emphasized to improve the resistance of the meteorite impact on the moon. The maximum tensile strength and impact toughness reach 36.2 MPa and 5.15 kJ/m², respectively. High-pressure melt extrusion for lunar regolith composite can increase the effective loading fraction up to 80 wt.% and relatively easily adapt to extreme conditions for in-situ manufacturing.

关键词： in-situ resource utilization melt extrusion molding lunar regolith-based composites mechanical properties additive manufacturing

HTML PDF 收藏

Probabilistic model for vessel-bridge collisions in the Three Gorges Reservoir

Bo GENG , Hong WANG , Junjie WANG ,

《结构与土木工程前沿（英文）》 2009年第3卷第3期页码 279-285 doi: 10.1007/s11709-009-0044-z

摘要： Based on a field observation on vessel transit path of three bridges over the Yangtze River in the Three Gorges Reservoir, and an analysis of the geometric probabilistic model of transiting vessels in collision probability calculation, the aberrancy angle and vessel velocity probabilistic model related with impact force, a probabilistic model is established and also verified by goodness-of-fit test. The vessel transit path distribution can be expressed by the normal distribution model. For the Three Gorges Reservoir, the mean and standard deviation adopt 0.2 and 0.1, respectively ( is the channel width). The aberrancy angle distribution of vessels accepts maximum I distribution model, and its distribution parameters can be taken as 0.314 and 4.354. The velocity distribution of up-bound and down-bound vessels can also be expressed by the normal distribution model.

关键词： vessel-bridge collision probabilistic model parameter statistics

HTML PDF 收藏

Construction of the vessel-collateral theory and its guidance for prevention and treatment of vasculopathy

Yiling Wu

《医学前沿（英文）》 2011年第5卷第2期页码 118-122 doi: 10.1007/s11684-011-0140-z

摘要： According to the self-discipline of traditional Chinese medicine, vessel-collateral theory was constructed systematically, which was important to improving prevention and treatment level of vasculopathy. The hypothesis of “homeostasis ( ), compensatory auto-adaptation ( ), regulation ( ) and equilibrium ( )” based on the “qi–yin-yang–five elements” coupled with the (nutrients)- (defense) theory, has become the core content of the vessel-collateral theory. Clinical and laboratory trials have been developed to further confirm the scientific connotations of the hypothesis, such as capsule, as the representative drugs of vessel collateral theory, showed good efficacy in protecting the vascular endothelium, stabilizing the vulnerable plaque and reducing the blood vessel spasm. “Sou, ti, shu, tong” was the characteristics of capsule in treating “microvascular damage” as the core mechanism of acute myocardial infarction, cerebral infarction and microvascular complications of diabetes. capsules in the treatment of arrhythmia have made integrated adjustment advantage. capsules have been made treating both manifestation and root cause of chronic heart failure. These research have improved prevention and treatment level of major vascular system diseases.

关键词： vessel-collateral theory vasculopathy prevention and treatment

HTML PDF 收藏

Influence evaluation of loading conditions during pressurized thermal shock transients based on thermal-hydraulics and structural analyses

Jinya KATSUYAMA, Shumpei UNO, Tadashi WATANABE, Yinsheng LI

《机械工程前沿（英文）》 2018年第13卷第4期页码 563-570 doi: 10.1007/s11465-018-0487-9

摘要：

The thermal hydraulic (TH) behavior of coo-lant water is a key factor in the structural integrity assessments on reactor pressure vessels (RPVs) of pressurized water reactors (PWRs) under pressurized thermal shock (PTS) events, because the TH behavior may affect the loading conditions in the assessment. From the viewpoint of TH behavior, configuration of plant equipment and their dimensions, and operator action time considerably influence various parameters, such as the temperature and flow rate of coolant water and inner pressure. In this study, to investigate the influence of the operator action time on TH behavior during a PTS event, we developed an analysis model for a typical Japanese PWR plant, including the RPV and the main components of both primary and secondary systems, and performed TH analyses by using a system analysis code called RELAP5. We applied two different operator action times based on the Japanese and the United States (US) rules: Operators may act after 10 min (Japanese rules) and 30 min (the US rules) after the occurrence of PTS events. Based on the results of TH analysis with different operator action times, we also performed structural analyses for evaluating thermal-stress distributions in the RPV during PTS events as loading conditions in the structural integrity assessment. From the analysis results, it was clarified that differences in operator action times significantly affect TH behavior and loading conditions, as the Japanese rule may lead to lower stresses than that under the US rule because an earlier operator action caused lower pressure in the RPV.

关键词： structural integrity reactor pressure vessel pressurized thermal shock thermal hydraulic analysis pressurized water reactor weld residual stress

HTML PDF 收藏

Cell carrier function of hollow-fiber membrane in rotating wall vessel bioreactor

SONG Kedong, LIU Tianqing, ZHAO Hu, LI Xiangqin, MA Xuehu, CUI Zhanfeng

《化学科学与工程前沿（英文）》 2008年第2卷第1期页码 34-39 doi: 10.1007/s11705-008-0022-3

摘要： Large-scale expansion of the osteoblasts of a Sprague-Dawley (SD) rat was studied in a rotating wall hollow-fiber membrane bioreactor (RWHMB) by using hollow-fiber membrane as the carrier. For the sake of contrast, cells were also expanded in a T-flask using a hollow-fiber membrane as carrier and in a rotating wall vessel bioreactor (RWVB) using a microcarrier. During the culture period, the cells were sampled every 12 h, and after 5 days, the cells were harvested and evaluated with scanning electron microscopy (SEM), hematoxylin-eosin (HE) staining and alkaline phosphatase (ALP) staining. Moreover, von-Kossa staining and Alizarin Red S staining were carried out for mineralized nodules formation. The results show that in RWHMB, the cells present better morphology and vitality and secrete much more extracellular matrix. It is concluded that the RWHMB combines the advantages of the rotating wall vessel and hollow-fiber membrane bioreactors. The hydrodynamic stimulation within it accelerates the metabolism of the osteoblast and mass transfer, which is propitious to cell differentiation and proliferation.

关键词： RWHMB microcarrier hematoxylin-eosin von-Kossa staining propitious

HTML PDF 收藏

The relationship between platelet-derived growth factor expression and angiogenesis/lymphangiogenesis in cervical cancer

Guocheng LIU MD, Shouhua YANG MD, Zehua WANG MD,

《医学前沿（英文）》 2009年第3卷第4期页码 447-451 doi: 10.1007/s11684-009-0082-x

摘要： This paper is aimed to examine if changes in platelet-derived growth factor (PDGF) expression at different stages of cervical cancer are related to the variation in blood vessel density (BVD) and lymphatic vessel density (LVD) to evaluate the relationship between PDGF expression and stages and metastasis of cervical cancer. Polymerase chain reaction (PCR) and RT-PCR were used to detect the expression levels of PDGF in 45 cervical cancer tissue samples (the experimental group). The samples were immunohistochemically stained with monoclonal antibodies D2-40 and CD34, and BVD and LVD were measured. The expressions of PDGF-A, -B, and- D were all higher in the experimental group than in the control group (<0.05); no significant difference was found in the expression of PDGF-C between the experimental group and the control group (>0.05). PDGF-A and -B expression was positively related with BVD and LVD (<0.01, R= 0.49, 0.527, 0.327, 0.68). The expression levels of PDGF-C and -D were not significantly related with BVD and LVD. At the early stage of cervical cancer, BVD and LVD were significantly higher than in the controls (<0.01). The BVD and LVD in tissues in the surrounding areas of cervical cancer were significantly higher than in tissues at cancer center, and LVD was related to lymph node metastasis (<0.001). BVD and LVD were not associated with the differentiation and pathological stages of cervical cancer. The expressions of PDGF-A, -B, and -D in cervical cancer were closely related with the clinical stages of cervical cancer. PDGF-A and -B were intimately associated with the lymph node metastasis and prognosis of cervical cancer.

关键词： cervical cancer lymphatic vessel density blood vessel density platelet-derived growth factor

HTML PDF 收藏

Technological development and engineering applications of novel steel-concrete composite structures

Jianguo NIE, Jiaji WANG, Shuangke GOU, Yaoyu ZHU, Jiansheng FAN

《结构与土木工程前沿（英文）》 2019年第13卷第1期页码 1-14 doi: 10.1007/s11709-019-0514-x

摘要：

In view of China’s development trend of green building and building industrialization, based on the emerging requirements of the structural engineering community, the development and proposition of novel resource-saving high-performance steel-concrete composite structural systems with adequate safety and durability has become a kernel development trend in structural engineering. This paper provides a state of the art review of China’s cutting-edge research and technologies in steel-concrete composite structures in recent years, including the building engineering, the bridge engineering and the special engineering. This paper summarizes the technical principles and applications of the long-span bi-directional composite structures, the long-span composite transfer structures, the comprehensive crack control technique based on uplift-restricted and slip-permitted (URSP) connectors, the steel plate concrete composite (SPCC) strengthen technique, and the innovative composite joints. By improving and revising traditional structure types, the comprehensive superiority of steel-concrete composite structures is well elicited. The research results also indicate that the high-performance steel-concrete composite structures have a promising popularizing prospect in the future.

关键词： high-performance composite structure bi-directional composite composite transfer uplift-restricted and slip-permitted connectors steel plate concrete composite strengthen

HTML PDF 收藏

王聪：梯度Cr-Mo合金耐热压力容器钢焊接接头蠕变开裂机理（2020年1月10日）

王聪(高级职称)

2020年03月13日

关键词：冶金

Deep eutectic solvent inclusions for high- composite dielectric elastomers

《化学科学与工程前沿（英文）》 2022年第16卷第6期页码 996-1002 doi: 10.1007/s11705-022-2138-2

摘要： Recent advances in novel electroactive devices have placed new requirements on material development. High-performance dielectric elastomers with good mechanical stretchability and high dielectric constant are under high demand. However, the current strategy for fabricating these materials suffers from high cost or low thermal stability, which greatly hinders large-scale industrial production. Herein, we have successfully developed a novel strategy for improving the dielectric constant of polymeric elastomers via deep eutectic solvent inclusion by taking advantage of the low cost, convenient and environmentally benign synthesis process and high ionic conductivity from deep eutectic solvents. The as-prepared composite elastomers showed good stretchability and a greatly enhanced dielectric constant with a negligible increase in dielectric dissipation. Moreover, we have proven the universality of our strategy by using different types of deep eutectic solvents. It is believed that low-cost, easy-synthesis and environmentally friendly deep eutectic solvents including composite elastomers are highly suitable for large-scale industrial production and can greatly broaden the application fields of dielectric elastomers.

关键词： composite materials deep eutectic solvent dielectric elastomer high dielectric constant

HTML PDF 收藏

Deviation correction strategy for the earth pressure balance shield based on shield–soil interactions

《机械工程前沿（英文）》 2022年第17卷第2期 doi: 10.1007/s11465-022-0676-4

摘要： The control system presently used in shield posture rectification is based on driver experience, which is marginally reliable. The study of the related theory is flawed. Therefore, a decision-making approach for the deviation correction trajectory and posture rectification load for an earth pressure balance (EPB) shield is proposed. A calculation model of posture rectification load of an EPB shield is developed by considering the interactions among the cutter head, shield shell, and ground. The additional position change during the shield attitude correction is highlighted. The posture rectification loads and shield behaviors results can be solved by the proposed method. The influences of the stratum distribution (i.e., bedrock height in the upper-soft and lower-hard strata) on shield behaviors and posture rectification loads are analyzed. Results indicated that the increase of pitch angle in the upper-soft and lower-hard strata causes a sharp rise in vertical displacement. The bedrock height increases the magnitudes of the required posture rectification moments when h_r/D > 0.5. For a tunnel with h_r/D ≤ 0.5, the variation of h_r/D has little effect on the posture rectification moments. Finally, the posture rectifying curves based on the theoretical model are compared with the target ones based on the double circular arc interpolation method. The required results can be obtained regardless of the soil–rock compound stratum distribution. The maximum rectification moment in the rock layer is almost 12.6 times that in the soil layer. Overall, this study provides a valuable reference for moment determination and the trajectory prediction of posture rectification in compound strata.

关键词： additional position change deviation correction trajectory earth pressure balance shield mechanical model posture rectification