A Strain-equivalent Non-local Constitutive Model for Lamellar Dual-Phase Materials     

YANG YUN_min  WANG Jun  PENG Xiang_he 《保鲜与加工》2002,(3):105-108

Pearlitic steel is composed of numerous pearlitic colonies with randomly distributed orientations,and each colony is composed of many alternatively arranged parallel lamellas of ferrite and cementite.The pearlitic steel with fine interlamellar spacing possesses excellent mechanical properties,such as high strength,good resistance against wear,and high fatigue life,etc. Based on the inconsistency of the deformation between the two phases,a strain_equivalent and non_local constitutive model is proposed. Using this model,the effect of the interlamellar spacing of peailitic steel,a fundamental parmeter of the microstructure of pearlitic material, on its macroscopic mechanical behavior can be described without changing the local material parameters for each phase of the material.The asymmetrical cyclic plasticity of both the hot_rolled and the off_line full_length quenched pearlitic steel PD3 is analyzed.The comparison between the computational and the experimental results shows satisfactory agreement.  相似文献   

Summarization of Current Research on Application of Durability of Structures     

LI Hong yi  CHEN Zhao hui  BAI Shao liang  XIANG Chang kui 《保鲜与加工》2001,(2):98-103

This paper summarized the recent research results about the durability of structures, introduced their current application in durability design, appraisal, estimation of rest life and strategy of maintenance and strengthening as well as in other fields.  相似文献   

Appropriate Technology and Corresponding Design Strategies for the Steel Construction Congregated Apartments     

LI Sheng-cai~  HUANG Yin~  LIU Jian-rong~ 《保鲜与加工》2005,(5):34-37

In this paper,notions on appropriate technology for the Steel Construction Congregated Apartments are proposed in order to deal with the technical impediment that arises from applying steel structural techniques to the congregated apartments.The appropriate technology for the steel construction congregated apartments is defined as systematic technologies that are in harmony with the status quo of Chinese productive force level,social culture and building technology,and as the strategies of choosing or balancing technology according to sustainable development principle.The principal design and constructing strategies of appropriate technology are as follows:(1) organization of residential space combined with steel construction techniques,(2) suitable structural system,(3) a new idea of fire resistance,and(4) kit building technique etc.A technological concept analysis about an ideal model of a steel construction system congregated apartment combined with the appropriate technology is also presented.  相似文献   

Test and Computation of Suspended Cable''s Static Tensile Force of a ''Basket Handle'' Type Arch Bridge     

《保鲜与加工》2003,(2):54

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Microstructures, Reaction Kinetics and Properties of Reaction Between Magnesium and Silica Glass          下载免费PDF全文

ZHOU Zheng  FENG yi 《保鲜与加工》2007,(1):61-64

In earlier calculation models,the stiffness centers in frame-shear wall structures have been located by the structural torsion stiffness.However,the results are illogical owing to the difference between the distortion character and the shears distribute mechanism of the frames and shear walls.In this paper,a new formula for calculating story stiffness is introduced,which can consider the stiffness of the frames and shear walls at the same time.The structural stiffness centers,the torsion eccentric distances and torsion effect are calculated,and the stiffness of elements is considered also.It is shown that the concept of the presented stiffness model is clear and the results are reasonable,which can be used to calculate the appreciative torsion effect.  相似文献   

Application OF SFRHSC IN Blast-Resistant Engineering     

JIAO Chu-jie  SUN Wei  GAO Pei-zheng  ZHOU Yun 《保鲜与加工》2007,(5):168-172

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Effects of Cerium-rich Mischmetal on Microstructures and Mechanical Properties of Die-cast AZ81 Alloys     

ZHU Zhi-bing  LONG Si-yuan  ZHANG Zong-he  JIANG De-ping  LIAO Hui-min 《保鲜与加工》2007,(2):22-25

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蠕变模型对约束钢梁抗火性能分析的影响   总被引：2，自引：0，他引：2  

王卫永  何平召 《保鲜与加工》2015,(5):41-47

钢材在高温和荷载作用下产生明显蠕变变形,影响火灾中结构的变形和受力性能。现有的蠕变模型较多,但没有一个广泛适用的蠕变模型。不同的蠕变模型对钢结构抗火分析结果有很大影响。为了量化蠕变模型对约束钢梁抗火性能分析的影响,对5种常用的蠕变模型进行了对比分析。采用编写的约束钢梁计算程序,分别计算5种蠕变模型下约束钢梁的抗火性能并与试验数据进行对比。结果表明,采用Norton蠕变模型的计算结果与试验数据吻合最好。最后对影响约束钢梁抗火性能参数进行了研究,研究发现,Harmathy蠕变模型对约束梁抗火性能分析结果影响最大;不同蠕变模型对不同荷载比、约束刚度下的约束钢梁抗火性能影响程度均不同。  相似文献   

The Monitoring Measurements and Country Rock Control of NATM in Tunnel of Express Road during Construction     

Liu Li Tang Janxin 《保鲜与加工》1995,(5):113-119

In this paper the author' s study on the monitoring measurement technique of NATM,the regularity and conditions of the country rock deformation are analysed based on the site measurement data in the west section of Zhongliangshan tunnel. The regression analysis of measure data for different measure lines of vavious country rock is done by the use of self-compiled CRAP program. The stability criterion for various rockmass and optimum time for primary and permanent support are provided. The conclusion available could conduct the theoretical research of NATM deeply as well as tunnel design and construction.  相似文献   

GENERAL WIRING CALCULATION FORMULAE FOR FIRE AUTOMATIC DETECTION AND CONTROL SYSTEM     

Wang Jifeng 《保鲜与加工》1992,(4)

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