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Acta Metallurgica Sinica(English Letters) 1997年第1期10卷 65-70页

作者： S.X. Zhao X.F. Sun and Z.B. Kuang (Institute of Applied Mechanics, southwestern jiaotong university, Chengdu 610031, China)(Institute of Engineering Mechanics, Xi’an jiaotong university, Xi’an 710049, China) southwestern jiaotong univ Chengdu China

Experimental investigations were pedermed on the plastic deformation along bilinear strain paths with various values of corner-angle by subjecting thin-walled tubular specimens of type 302 stainless steel to combined axial and torsional loads. Variations of scalar and vectorial behavior of the stress response are discnssed in the vector space of plastic strain. It is found that the intrinsic geometry of loading path, the plastic strain history and the coapled effect among strain components effect effectively the stress response of the material. The experimental results also show that these effects will disappear gradually with increasing strain.

关键词： complex loading plastic delay angle history-dependence of plastic deformation

KINETICS OF AUSTENITIC ISOTHERMAL DECOMPOSITION AND Mn PARTITION IN Fe-C-Mn-B ALLOYS

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Acta Metallurgica Sinica(English Letters) 1992年第4期5卷 240-244页

作者： YANG Liu southwestern jiaotong university,Chengdu,ChinaFANG Hongsheng Tsinghua university,Beijing,ChinaMENG Zhihe Luoyang Institute of Technology,China southwestern jiaotong univ Chengdu China

A proper addition of Mn to Fe-C alloys could delay the isothermal transformation and change remarkably the TTT-curves to bay-like *** concentration of Mn at the α/γ interphase boundary and thir partition between α- and γ- phase were measured by STEM/*** results show that the partition of Mn diminishes gradually as the reaction temperature *** exists a certain temperature range with the strong- est Mn concentration spike at the interphase although no Mn partition is found between austenite and ferrite,and this temperature range is correspondent with the bay-temperature on TTT curves of the *** is thus suggests that the change of TTT-curve configuration is due to the partition of alloy *** bay-like shape is attributed to the solute drag ef- fect and the solute drag-like effect caused by the enrichment of Mn at the α/γ interphase.

关键词： TTT curve partition Mn Fe-C-Mn-B alloy solute drag

POSITIVE SOLUTIONS OF HIGHER ORDER SUBLINEAR FUNCTIONAL DIFFERENTIAL EQUATIONS

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Acta Mathematica Scientia 1992年第3期12卷 337-345页

作者：缪益华 Dept. of Appl. Math. Southwestern Jiaotong Univ. Chengdu 610031 China

In this paper, we discuss higher order sublinear functional differential equation x(n)(t)+p(t)x(v)(g(t)) =0 t greater-than-or-equal-to t0 where n greater-than-or-equal-to 2, 0infinity) g(t) = infinity. R+ = [0, infini... 详细信息

关键词：高阶次线性泛函微分方程正解

INFLUENCES OF HEAT-TREATING PROCESS ON DUCTILE FRACTURE MECHANISM UNDER MIXED MODE LOADINGS

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中国有色金属学会会刊：英文版 1998年第3期8卷 23-29页

作者： Hong, Zuo Fangwen, Wang Xi'an jiaotong univ Xi'an China

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｅｎｇｉｎｅｅｒｉｎｇｐｒａｃｔｉｃｅ，ａｌｏｔｏｆｃｒａｃｋｐｒｏｂｌｅｍｓｃａｎｂｅｉｎｃｌｕｄｅｄｉｎｄｉｆｅｒｅｎｔｃｏｍｂｉｎａｔｉｏｎｓｏｆｔｈｒｅｅｂａｓｉｃｆｒａｃｔｕ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｅｎｇｉｎｅｅｒｉｎｇｐｒａｃｔｉｃｅ，ａｌｏｔｏｆｃｒａｃｋｐｒｏｂｌｅｍｓｃａｎｂｅｉｎｃｌｕｄｅｄｉｎｄｉｆｅｒｅｎｔｃｏｍｂｉｎａｔｉｏｎｓｏｆｔｈｒｅｅｂａｓｉｃｆｒａｃｔｕｒｅｍｏｄｅｓ，ｉ．ｅ．ｍｉｘｅｄ...

关键词： mixed mode fracture fracture mechanism shearing yield strain hardening index

DETERMINATION OF MICROCRACK BOUNDARY RESULTING FROM ROCK BLASTING WITH SEISMIC TRAVELTIME TOMOGRAPHY

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中国有色金属学会会刊：英文版 1998年第1期8卷 155-160页

作者： Zhang, Jichun Song, Linping Southwest jiaotong univ Chengdu China

ＤＥＴＥＲＭＩＮＡＴＩＯＮＯＦＭＩＣＲＯＣＲＡＣＫＢＯＵＮＤＡＲＹＲＥＳＵＬＴＩＮＧＦＲＯＭＲＯＣＫＢＬＡＳＴＩＮＧＷＩＴＨＳＥＩＳＭＩＣＴＲＡＶＥＬＴＩＭＥＴＯＭＯＧＲＡＰＨＹ①ＺｈａｎｇＪｉｃｈｕｎＤｅｐａｒｔｍ... 详细信息

ＤＥＴＥＲＭＩＮＡＴＩＯＮＯＦＭＩＣＲＯＣＲＡＣＫＢＯＵＮＤＡＲＹＲＥＳＵＬＴＩＮＧＦＲＯＭＲＯＣＫＢＬＡＳＴＩＮＧＷＩＴＨＳＥＩＳＭＩＣＴＲＡＶＥＬＴＩＭＥＴＯＭＯＧＲＡＰＨＹ①ＺｈａｎｇＪｉｃｈｕｎＤｅｐａｒｔｍｅｎｔｏｆＵｎｄｅｒｇｒｏｕｎｄＥ...

关键词： rock mass blasting microcracking zone measuring method tomography

MICROSTRUCTURAL EVOLUTION DURING COMBUSTION SYNTHESIS OF TiC-Fe CERMET

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中国有色金属学会会刊：英文版 1999年第2期9卷 82-87页

作者： Quncheng, Fan Huifen, Chai Zhihao, Jin Xi'an jiaotong univ Xi'an China

１ＩＮＴＲＯＤＵＣＴＩＯＮＳｉｎｃｅｉｔｗａｓｄｉｓｃｏｖｅｒｅｄｉｎ１９６７，ｔｈｅｃｏｍｂｕｓｔｉｏｎｓｙｎｔｈｅｓｉｓｈａｓｂｅｅｎｕｓｅｄｆｏｒｓｙｎｔｈｅｓｉｚｉｎｇａｖａｒｉｅｔｙｏｆｃｏｍｐｏｕｎｄｓ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＳｉｎｃｅｉｔｗａｓｄｉｓｃｏｖｅｒｅｄｉｎ１９６７，ｔｈｅｃｏｍｂｕｓｔｉｏｎｓｙｎｔｈｅｓｉｓｈａｓｂｅｅｎｕｓｅｄｆｏｒｓｙｎｔｈｅｓｉｚｉｎｇａｖａｒｉｅｔｙｏｆｃｏｍｐｏｕｎｄｓａｎｄｃｏｍｐｏｓｉｔｅｓ，ｅｇＴ...

关键词： microstructural evolutionTiCFe cermetcombustion synthesis

FEEDBACK LINEARIZATION CONTROL FOR ELECTRONICALLY CONTROLLABLE CLUTCH OF VEHICLE

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Chinese Journal of Mechanical Engineering 1999年第4期12卷 303-311页

作者： Chen Li Zhang Jianwu Huang Weigang Shanghai jiaotong university Gao Chunming Shanghai Clutch Factory Shanghai jiaotong univ China

An investigation is made to the friction chutch engagement control of automotive AMT systems based on a nonlinear dynamic model with double inputs. According to friction torque transmission characteristics during clutch engagement, an equivalent, fully controllable and linearized model and the feedback linearization control are derived from the original system with nonlinearities via homomorphic transforms. By the resulting mathematical modeling, computer simulations are made both for the original nonlinear and feedback linearized systems with incorporation of ordinary PID controllers to follow ideal vehicle dynamic responses. It has been shown by comparison between the two sets of numerical results that the feedback linearization control designed for the nonlinear system is of fine accuracy and robustness in model tracking behaviors of clutch engagements.

关键词： Automated clutch Nonlinear system dynamics Feedback linearization

Knowledge-Based Multifaceted Modeling Methodology for Open Complex Giant Systems

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Journal of Systems Engineering and Electronics 1997年第3期8卷 34-42页

作者： Qin, Shiyin Xi'an jiaotong univ China

In this paper, the structure characteristics of open complex giant systems are concretely analysed in depth, thus the view and its significance to support the meta synthesis engineering with manifold knowledge models are clarified. Furthermore, the knowledge based multifaceted modeling methodology for open complex giant systems is emphatically studied. The major points are as follows: (1) nonlinear mechanism and general information partition law; (2) from the symmetry and similarity to the acquisition of construction knowledge; (3) structures for hierarchical and nonhierarchical organizations; (4) the integration of manifold knowledge models; (5) the methodology of knowledge based multifaceted modeling.

关键词： Knowledge based multifaceted modeling Open complex giant systems Metasynthesis engineering Interpretive structural modeling.

NUMERICAL SIMULATION FOR MEASURING YIELD STRENGTH OF THIN METAL FILM BY NANOINDENTATION METHOD

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中国有色金属学会会刊：英文版 1997年第3期7卷 66-69页

作者： Ma, Dejun Xu, Kewei He, Jiawen Xi'an jiaotong univ Xi'an China

ＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＦＯＲＭＥＡＳＵＲＩＮＧＹＩＥＬＤＳＴＲＥＮＧＴＨＯＦＴＨＩＮＭＥＴＡＬＦＩＬＭＢＹＮＡＮＯＩＮＤＥＮＴＡＴＩＯＮＭＥＴＨＯＤ①ＭａＤｅｊｕｎ，ＸｕＫｅｗｅｉ，ＨｅＪｉａｗｅｎＳ... 详细信息

ＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＦＯＲＭＥＡＳＵＲＩＮＧＹＩＥＬＤＳＴＲＥＮＧＴＨＯＦＴＨＩＮＭＥＴＡＬＦＩＬＭＢＹＮＡＮＯＩＮＤＥＮＴＡＴＩＯＮＭＥＴＨＯＤ①ＭａＤｅｊｕｎ，ＸｕＫｅｗｅｉ，ＨｅＪｉａｗｅｎＳｔａｔｅＫｅｙＬａｂｏｒａｔｏｒｙ...

关键词： nanoindentation method thin metal film mechanical properties finite element method

2-D　Conductor　Cross　Section　Reconstruction　via　Amplitudes　of　Backscattered　Field　in　Near　Regions

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Journal of Systems Engineering and Electronics 1997年第1期8卷 29-38页

作者： Yu, Chunyang Dong, Xiaolong Wang, Wenbing Xi'an jiaotong univ China

In this paper, an improved approach is presented to reconstruct two dimensional conduc- tor profile illuminated by incident plane waves of multiple frequencies and directions via amplitudes of backscattered field in near regions. Newton-Kantorovitch algorithm is adopted to cast the non- linear coupled integral equations into linearized form, method of moment is used to transform the above linearized integral equations into matrix form, the resulting ill-posed overdetermined linear equations are solved using pseudoinverse technique based on Gram-Schedmit orthogonal procedure. Initial values are determined by solving a nonlinear least aquare error problem to establish an equivat lent circular cylinder. The effects of various parameters on reconstruction quality are discussed with numerical results and analysis.

关键词： Cross section reconstruction Backscattered field Newton-Kantorovitch algorithm Pseudoinverse technique.