http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Xiangrong Chen (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
Practical Design Methods for Fire Resistance of Restrained Cellular Steel Beams
Xing Chen,Xiangrong Chen,Gang Li 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.6
Thermal responses of steel beams under fi re can be intricate, considering the coupling eff ects between material thermalexpansion, mechanical property degradation, and constraints by surrounding structural members. While research eff orts have focused on catenary action of structural members without initial imperfections, few accurate and effi cient methods are found to reveal the fi re resistance of restrained cellular steel beams (RCSBs). In this paper, parametric and regression analysis are applied to investigate the thermal behavior of RCSBs with initial imperfections. Eight groups of RCSBs are set up to demonstrate how various design parameters may aff ect structural responses at elevated temperatures. The results indicate that axial restraint stiff ness ratio, load ratio, and opening diameter-to-height ratio signifi cantly aff ect the structural responses of RCSBs in fi re, followed by the rotational restraint stiff ness ratio and span-to-depth ratio as secondary eff ects. Through the orthogonal and regression analysis, simplifi ed formulas for four characteristic temperatures and four characteristic internal forces are defi ned, which agree with fi nite element results to a certain extent. Meanwhile, reasonable range of each design parameter is put forward for a more effi cient and applicable calculation of thermo-mechanical responses of RCSBs. The proposed formulas are practical, convenient and accurate enough to be applied for engineering design.
-
Graphene Enhanced Electrical Properties of Polyethylene Blends for High-Voltage Insulation
Zuojun Wei,Yaxin Hou,Chen Jiang,Haiyan Liu,Xiangrong Chen,Anyun Zhang,Yingxin Liu 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.5
Graphene as a novel additive in low density polyethylene (LDPE), high density polyethylene–low density polyethylene blend(10%HDPE–LDPE) and polypropylene–low density polyethylene blend (10%PP–LDPE), is investigated for promising ecofriendlyinsulating materials in high voltage cables. The composites with graphene amounts of 0, 0.002 wt%, 0.02 wt%,and 0.2 wt% are prepared by the solution mixing method. With attempt to disclose the structure–property relationships, thecomposites are extensively characterized by physical techniques including Fourier transform infrared spectroscopy, X-raydiffraction, atomic force microscopy, transmission electron microscopy, scanning electron microscopy, thermogravimetricanalysis and differential scanning calorimetry, and electrical measurements including electrical treeing, direct current conductivityand space charge distributions. Results show that graphene can significantly enhances the thermal stability of LDPEand 10%PP–LDPE, slightly decrease the degree of crystallinity, change the size of the crystal diameters, and improve thephase distribution of the polymer blends. Consequently, graphene can prolong the electrical tree initiation time and blockthe extension of electrical tree. Besides, it can modulate the trap distributions, which will further change the conductivityand ability to suppress space charge accumulations. This excellent performance of graphene could be attributed to its goodexfoliation, uniform dispersion and outstretched morphology in the polymer matrix, as well as its strong ability to captureelectrons.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
