Influence of flexible molecular structure on the cryogenic mechanical properties of epoxy matrix and carbon fiber/epoxy composite laminate
In this study, a flexible polymer (polysiloxane) containing SiOSi molecular chains and epoxy groups (EPSE) was prepared. The effect of EPSE on the cryogenic mechanical properties of epoxy matrix and carbon fiber (CF) reinforced epoxy composite laminate was investigated in detail. At RT, with an...
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doaj-f08fa682b61f4cdfbe0bc316861907a82020-11-25T03:32:01ZengElsevierMaterials & Design0264-12752020-10-01195109028Influence of flexible molecular structure on the cryogenic mechanical properties of epoxy matrix and carbon fiber/epoxy composite laminateShichao Li0Duo Chen1Yuhuan Yuan2Chang Gao3Yunguang Cui4Hongyu Wang5Xin Liu6Minjing Liu7Zhanjun Wu8School of Chemical Engineering, Department of Polymer Science and Materials, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, PR ChinaSchool of Materials Science and Engineering, Faculty of Mechanical Engineering Materials and Energy, Dalian University of Technology, Dalian 116024, PR ChinaSchool of Materials Science and Engineering, Faculty of Mechanical Engineering Materials and Energy, Dalian University of Technology, Dalian 116024, PR ChinaSchool of Materials Science and Engineering, Faculty of Mechanical Engineering Materials and Energy, Dalian University of Technology, Dalian 116024, PR ChinaSchool of Aeronautics and Astronautics, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, PR ChinaSchool of Aeronautics and Astronautics, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, PR ChinaSchool of Aeronautics and Astronautics, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, PR ChinaSchool of Aeronautics and Astronautics, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, PR China; Corresponding authors.School of Aeronautics and Astronautics, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, PR China; Corresponding authors.In this study, a flexible polymer (polysiloxane) containing SiOSi molecular chains and epoxy groups (EPSE) was prepared. The effect of EPSE on the cryogenic mechanical properties of epoxy matrix and carbon fiber (CF) reinforced epoxy composite laminate was investigated in detail. At RT, with an EPSE content of 8 wt%, the failure strain and fracture toughness KIC value of epoxy resin was improved by 69.4% and 10.4%, respectively. At cryogenic temperature, the tensile strength, failure strain and KIC value of EPSE-epoxy reached a maximum of 207 MPa, 3.13%, and 2.60 MPa·m1/2, respectively. Micro-morphology of the fracture surface indicated that the incorporation of EPSE improved the resistance to crack growth. The flexural strength of CF/EPSE-epoxy laminate at 77 K was 17.2% higher than that of CF/neat epoxy laminate, which mainly attributed to the flexible SiOSi molecular chains in EPSE reducing the CF/matrix interface thermal stress. The transition of failure mode resulted in the jagged-shape load fluctuations in the load-displacement curves of laminates at 77 K. Thermal cycling affecting the flexural strength of CF/EPSE-epoxy laminate was mainly ascribed to the release of part of thermal residual stress and the formation of interface debonding.http://www.sciencedirect.com/science/article/pii/S0264127520305633Composite laminateEpoxy resinToughnessCryogenic mechanical propertiesThermal cycling |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Shichao Li Duo Chen Yuhuan Yuan Chang Gao Yunguang Cui Hongyu Wang Xin Liu Minjing Liu Zhanjun Wu |
spellingShingle |
Shichao Li Duo Chen Yuhuan Yuan Chang Gao Yunguang Cui Hongyu Wang Xin Liu Minjing Liu Zhanjun Wu Influence of flexible molecular structure on the cryogenic mechanical properties of epoxy matrix and carbon fiber/epoxy composite laminate Materials & Design Composite laminate Epoxy resin Toughness Cryogenic mechanical properties Thermal cycling |
author_facet |
Shichao Li Duo Chen Yuhuan Yuan Chang Gao Yunguang Cui Hongyu Wang Xin Liu Minjing Liu Zhanjun Wu |
author_sort |
Shichao Li |
title |
Influence of flexible molecular structure on the cryogenic mechanical properties of epoxy matrix and carbon fiber/epoxy composite laminate |
title_short |
Influence of flexible molecular structure on the cryogenic mechanical properties of epoxy matrix and carbon fiber/epoxy composite laminate |
title_full |
Influence of flexible molecular structure on the cryogenic mechanical properties of epoxy matrix and carbon fiber/epoxy composite laminate |
title_fullStr |
Influence of flexible molecular structure on the cryogenic mechanical properties of epoxy matrix and carbon fiber/epoxy composite laminate |
title_full_unstemmed |
Influence of flexible molecular structure on the cryogenic mechanical properties of epoxy matrix and carbon fiber/epoxy composite laminate |
title_sort |
influence of flexible molecular structure on the cryogenic mechanical properties of epoxy matrix and carbon fiber/epoxy composite laminate |
publisher |
Elsevier |
series |
Materials & Design |
issn |
0264-1275 |
publishDate |
2020-10-01 |
description |
In this study, a flexible polymer (polysiloxane) containing SiOSi molecular chains and epoxy groups (EPSE) was prepared. The effect of EPSE on the cryogenic mechanical properties of epoxy matrix and carbon fiber (CF) reinforced epoxy composite laminate was investigated in detail. At RT, with an EPSE content of 8 wt%, the failure strain and fracture toughness KIC value of epoxy resin was improved by 69.4% and 10.4%, respectively. At cryogenic temperature, the tensile strength, failure strain and KIC value of EPSE-epoxy reached a maximum of 207 MPa, 3.13%, and 2.60 MPa·m1/2, respectively. Micro-morphology of the fracture surface indicated that the incorporation of EPSE improved the resistance to crack growth. The flexural strength of CF/EPSE-epoxy laminate at 77 K was 17.2% higher than that of CF/neat epoxy laminate, which mainly attributed to the flexible SiOSi molecular chains in EPSE reducing the CF/matrix interface thermal stress. The transition of failure mode resulted in the jagged-shape load fluctuations in the load-displacement curves of laminates at 77 K. Thermal cycling affecting the flexural strength of CF/EPSE-epoxy laminate was mainly ascribed to the release of part of thermal residual stress and the formation of interface debonding. |
topic |
Composite laminate Epoxy resin Toughness Cryogenic mechanical properties Thermal cycling |
url |
http://www.sciencedirect.com/science/article/pii/S0264127520305633 |
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