{"title":"Properties, mechanisms and their analysis of carbon fiber sandwich structures with short-aramid-fiber interfacial toughening","authors":"H. R. Chen, Zhi Sun, S. Shi, X. Hu","doi":"10.7511/DLLGXB201601016","DOIUrl":"https://doi.org/10.7511/DLLGXB201601016","url":null,"abstract":"Carbon fiber sandwich structures are widely used as load-bearing structures in aerospace,automobile and other vehicles.Interfacial fracture,which frequently occurs in these structures,could lead to large-area debonding,face-sheet buckling and significantly affect the structural safety.Shortaramid-fibers were selected to toughen the interface of carbon fiber sandwich.Low density tissue of short-aramid-fibers were inserted at the interface during the manufacturing of sandwich structures,and the interfacial toughness was enhanced by bridging effect of short-aramid-fibers.The loaddisplacement curves and failure modes of toughened and plain sandwich specimens were firstly compared through bending tests and compressive tests.The experimental results indicate that various mechanical properties are all reinforced by short-aramid-fiber toughening.Then,the toughening effect and mechanism of interleaved aramid fibers were examined by asymmetric double cantilever beam test and scanning electron microscopy respectively.Finally,based on the singularity solution of uniform elastic material crack and displacement shock solution of crack tip of interface,an extended finite element model(XFEM),which considered the complex stress field at the crack tip of interface,was proposed for simulation of interfacial fracture of carbon fiber sandwich structures.This study will benefit the disclosing of fracture mechanism of short-aramid-fiber toughened interface,establishing the method of designing interfacial toughening parameters,increasing the mechanical properties of carbon fiber sandwich structures, and providing scientific basis for health monitoring and manufacturing of this kind of structure.","PeriodicalId":38757,"journal":{"name":"Dalian Ligong Daxue Xuebao/Journal of Dalian University of Technology","volume":"56 1","pages":"103-110"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71133687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Study of Sino-US Intra-industry Trade in a Perspective of Intra-product International Specialization","authors":"Huang Rui","doi":"10.25236/icepbm.2018.42","DOIUrl":"https://doi.org/10.25236/icepbm.2018.42","url":null,"abstract":"The paper makes an analysis of the development of processing trade and parts and components trade of China,and a statistical account of the level of intra-industry trade of Sino-US main trade commodities between 1987 and 2006 from a perspective of China's participation in intra-product international specialization.It showed that the Sino-US trade structure and the level of Sino-US intra-industry trade had distinctly improved.Based on the empirical study,the paper examines several influential factors.The result indicates that the intra-product international specialization plays a significant role in promoting the level of intra-industry trade of Sino-US high technology industries,medium technology industries and total industries.Therefore the further improvement of China's position in the intra-product international specialization is of great significance to improve the level of Sino-US intra-industry trade.","PeriodicalId":38757,"journal":{"name":"Dalian Ligong Daxue Xuebao/Journal of Dalian University of Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69423825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}