Composites Pub Date : 2000-03-06 DOI: 10.4271/2000-01-0100

M. Sardou, Patricia Djomseu

引用次数: 9

Shear strength of polymers and fibre composites: 2. carbon/epoxy pultrusions 聚合物和纤维复合材料的抗剪强度:碳/环氧树脂拉挤成型

Composites Pub Date : 1995-12-01 DOI: 10.1016/0010-4361(95)90877-3

K. Liu, M.R. Piggott

引用次数: 21

Microscopic fatigue damage progress in CFRP cross-ply laminates CFRP交叉层合板微观疲劳损伤研究进展

Composites Pub Date : 1995-12-01 DOI: 10.1016/0010-4361(95)90879-5

Nobuo Takeda, Shinji Ogihara, Akira Kobayashi

引用次数: 65

Design procedure for reducing the stress concentration around circular holes in laminated composites 降低层压复合材料圆孔周围应力集中的设计方法

Composites Pub Date : 1995-12-01 DOI: 10.1016/0010-4361(95)90875-Z

Rosen T. Tenchev, Magne K. Nygard, Andreas Echtermeyer

引用次数: 15

Approximate elastic-plastic analysis of the static and impact behaviour of polymer composite sandwich beams 聚合物复合材料夹层梁静力和冲击性能的近似弹塑性分析

Composites Pub Date : 1995-12-01 DOI: 10.1016/0010-4361(95)90874-Y

R.A.W. Mines, Norman Jones

{"title":"Approximate elastic-plastic analysis of the static and impact behaviour of polymer composite sandwich beams","authors":"R.A.W. Mines, Norman Jones","doi":"10.1016/0010-4361(95)90874-Y","DOIUrl":"10.1016/0010-4361(95)90874-Y","url":null,"abstract":"<div><p>An elastic-plastic beam bending model has been developed to simulate the post-upper skin failure energy absorption behaviour of polymer composite sandwich beams under three-point bending. The beam skins consist of woven and chopped strand glass, while the core is a resin impregnated non-woven polyester material known as Coremat. A polyester resin was used for the construction. The theoretical model consists of a central hinge dominated by a crushing core and tensile elastic strains in the lower skin. Experimental measurements of the non-linear force-deflection characteristics for the beam are compared to the theoretical predictions from the model, and it is shown that the shear crushing of the core has an important effect on the behaviour of the beam. The model shows that the most important material properties are the lower skin tensile failure strain and the core crushing strength. Dynamic effects are included in the model in the form of a strain rate dependence of the core crushing stress and the strain rate dependence of the failure strain in the lower skin. The increase in material strength with strain rate gives rise to an improved energy absorption capacity for the beam under impact loading.</p></div>","PeriodicalId":100296,"journal":{"name":"Composites","volume":"26 12","pages":"Pages 803-814"},"PeriodicalIF":0.0,"publicationDate":"1995-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0010-4361(95)90874-Y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89615107","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}

引用次数: 46

Effects of seawater absorption on fatigue crack development in carbon/epoxy EDT specimens 海水吸收对碳/环氧树脂EDT试样疲劳裂纹发展的影响

Composites Pub Date : 1995-12-01 DOI: 10.1016/0010-4361(95)90880-9

P. Chiou, W. L Bradley

引用次数: 22

Poisson's ratio and the interfacial behaviour of composite materials 泊松比与复合材料界面行为

Composites Pub Date : 1995-12-01 DOI: 10.1016/0010-4361(95)90882-Z

George Laird II, T.C. Kennedy

引用次数: 4

Influence of fibre content and impactor parameters on transverse impact response of uniaxially reinforced composite plates 纤维含量和冲击器参数对单轴增强复合材料板横向冲击响应的影响

Composites Pub Date : 1995-12-01 DOI: 10.1016/0010-4361(95)90881-Y

R.K. Mittal, M.S. Jafri

引用次数: 14

Comparative study of dynamic and static delamination behaviour of carbon fibre/epoxy composite laminates 碳纤维/环氧复合材料层合板动态与静态分层行为的对比研究

Composites Pub Date : 1995-12-01 DOI: 10.1016/0010-4361(95)90878-4

Min-Seok Sohn, Xiao-Zhi Hu

{"title":"Comparative study of dynamic and static delamination behaviour of carbon fibre/epoxy composite laminates","authors":"Min-Seok Sohn, Xiao-Zhi Hu","doi":"10.1016/0010-4361(95)90878-4","DOIUrl":"10.1016/0010-4361(95)90878-4","url":null,"abstract":"<div><p>Dynamic and static delamination characteristics of two unidirectional carbon fibre-reinforced epoxy composite laminates (Hercules MI 1610 and Torayca T300) have been studied under impact and low-speed (2 mm min<sup>1</sup>) test conditions. The influence of interlaminar reinforcement with chopped Kevlar fibres on toughness has also been examined. The quasi-static or low-speed delamination tests were conducted with the usual double cantilever beam, end-notched flexure and mixed-mode flexure specimens. To determine the corresponding mode I, mode II and mixed-mode toughnesses under the impact condition, a special specimen design has been adopted and tests were performed with a Charpy impact machine. The novel aspect of the test scheme in the present study is that a single-plane delamination surface with a well-defined fracture mode has been obtained. The dynamic and static delamination characteristics of the same fracture mode were then studied by scanning electron microscopy, and special features were compared. While interlaminar reinforcement with a small amount of chopped Kevlar fibres resulted in an appreciable increase in the quasi-static delamination toughness, it was less effective under the impact condition.</p></div>","PeriodicalId":100296,"journal":{"name":"Composites","volume":"26 12","pages":"Pages 849-858"},"PeriodicalIF":0.0,"publicationDate":"1995-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0010-4361(95)90878-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73782784","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}

引用次数: 45

Shear strength of polymers and fibre composites: 1. thermoplastic and thermoset polymers 聚合物和纤维复合材料的抗剪强度:热塑性和热固性聚合物

Composites Pub Date : 1995-12-01 DOI: 10.1016/0010-4361(95)90876-2

K. Liu, M.R. Piggott

{"title":"Shear strength of polymers and fibre composites: 1. thermoplastic and thermoset polymers","authors":"K. Liu, M.R. Piggott","doi":"10.1016/0010-4361(95)90876-2","DOIUrl":"10.1016/0010-4361(95)90876-2","url":null,"abstract":"<div><p>The shear strengths of eight thermoplastics and three DGEBA-based epoxies in sheet form have been tested by the punch and Iosipescu tests. The testing temperatures ranged from 20 to 120°C, and the glass transition temperatures were measured as well. The shear strengths of the epoxies were also estimated from compressive tests on short cylinders. The Iosipescu test gave very unreliable results for polymers in the rubbery state because large deformations were induced before failure, and this caused high tensile stresses to develop instead of high shear stresses. With the punch test the force often had two maxima before failure, and the discs punched out did not have straight sides, so there was also much doubt about the purity of the shear stresses developed. The two methods were often in sharp disagreement. However, they gave comparable results with epoxies tested at room temperature. Comparison with compressive tests indicated that the ratio of compressive yield strength to shear yield strength varied from 1.5 to 2.4. In view of the uncertainties in the tests, compressive testing may be a good method to obtain an approximate value for the shear strength. The Tresca criterion (i.e. divide the compressive yield strength by two to get the shear yield strength) is probably good enough in view of the uncertainties in the shear tests. It works equally well for the ultimate shear strength. A new and better test is clearly needed for the estimation of the shear strength of polymers in sheet form.</p></div>","PeriodicalId":100296,"journal":{"name":"Composites","volume":"26 12","pages":"Pages 829-840"},"PeriodicalIF":0.0,"publicationDate":"1995-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0010-4361(95)90876-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75001448","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}

引用次数: 45

Composites最新文献