Effect of off-axial angle on the low-velocity impact performance of braided laminates

The effects of thermoplastic polyimide (PI) and polypropylene (PP) fibers and areal density of toughened layer on interlaminar fracture toughness and impact performance of carbon fiber/epoxy (CF/EP) laminated composites were studied. Mode I interlaminar fracture toughness (GIC) was analyzed via double cantilever beam (DCB) tests. When comparing for the toughener type, PI played a positive role in enhancing the mode-I fracture toughness, while PP was not effective due to the less fiber bridge formed during composite curing. The toughening effects of areal density of PI were further investigated by end notched flexure (ENF) testing and low velocity impact testing to better understand the toughening mechanisms. The results revealed that the toughening effect reached its best effectiveness when the areal density of toughened layer was 30 g/m2. Compared with the control group, GIC and GIIC of CF/EP laminated composite were increased by 98.49% and 84.07%, and Fmax and Ee were enhanced by 92.38% and 299.08% under low velocity impact. There is no obvious delamination phenomenon on the surface of laminates after low velocity impact, indicating the improved interlaminar and impact performance of laminated composite.

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Low Velocity Impact Performance Analysis of Fiber Composite Structure Embedded with Shape Memory Alloy

TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES AEROSPACE TECHNOLOGY JAPAN ◽

10.2322/tastj.12.pc_35 ◽

2014 ◽

Vol 12 (ists29) ◽

pp. Pc_35-Pc_41

Author(s):

Ying-Chih LIN ◽

Yu-Liang CHEN ◽

Hung-Wen CHEN

Keyword(s):

Performance Analysis ◽

Shape Memory Alloy ◽

Shape Memory ◽

Composite Structure ◽

Fiber Composite ◽

Low Velocity Impact ◽

Low Velocity ◽

Velocity Impact ◽

Impact Performance

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Low-velocity impact performance of UHMWPE composites consolidated with carbide particles

Archives of Civil and Mechanical Engineering ◽

10.1007/s43452-020-00042-0 ◽

2020 ◽

Vol 20 (2) ◽

Author(s):

Selim Gürgen

Keyword(s):

Low Velocity Impact ◽

Low Velocity ◽

Velocity Impact ◽

Impact Performance ◽

Uhmwpe Composites ◽

Carbide Particles

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Low-velocity impact properties and finite element analysis of syntactic foam reinforced by warp-knitted spacer fabric

Textile Research Journal ◽

10.1177/0040517516660890 ◽

2016 ◽

Vol 87 (16) ◽

pp. 1938-1952 ◽

Cited By ~ 5

Author(s):

Chao Zhi ◽

Hairu Long ◽

Fengxin Sun

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Syntactic Foam ◽

Low Velocity Impact ◽

Low Velocity ◽

Element Analysis ◽

Velocity Impact ◽

Impact Performance ◽

Spacer Fabric ◽

The Impact

The aim of this research was to investigate the low-velocity impact properties of syntactic foam reinforced by warp-knitted spacer fabric (SF-WKSF). In order to discuss the effect of warp-knitted spacer fabric (WKSF) and hollow glass microballoon parameters on the impact performance of composites, eight different kinds of SF-WKSF samples were fabricated, including different WKSF surface layer structures, different spacer yarn diameters and inclination-angles, different microballoon types and contents. The low-velocity impact tests were carried out on an INSTRON 9250 HV drop-weight impact tester and the impact resistances of SF-WKSF were analyzed; it is indicated that most SF-WKSF specimens show higher peak impact force and major damage energy compared to neat syntactic foam. The results also demonstrate that the surface layer structure, inclination-angle of the spacer yarn and the volume fraction and type of microballoon have a significant influence on the low-impact performance of SF-WKSF. In addition, a finite element analysis finished with ANSYS/LS-DYNA and LS-PrePost was used to simulate the impact behaviors of SF-WKSF. The results of the finite element analysis are in agreement with the experimental results.

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Low Velocity Impact Assessment Of Flax And Kevlar-Flax Fibre Reinforced Polymer Laminates Using Experimental and Numerical Methods

10.32920/ryerson.14647116 ◽

2021 ◽

Author(s):

Benedict Lawrence Sy

Keyword(s):

Impact Toughness ◽

Composite Laminates ◽

Low Velocity Impact ◽

Low Velocity ◽

Velocity Impact ◽

Impact Performance ◽

Fibre Reinforced Polymer ◽

The Cross ◽

The Impact ◽

Polymer Laminates

Flax/epoxy composite laminates were tested under low velocity impact loading, using passive Infra-Red thermography to monitor the damage evolution during the impact event. Two configurations were tested: unidirectional ([08F]S) and cross-ply ([(0/90)4F]S). The unidirectional laminate exhibited poor and brittle impact response. Conversely, the cross-ply laminate showed better impact performance with its energy penetration threshold three times higher than the unidirectional. Its impact toughness was also 2.5 times higher. Additional tests were conducted to evaluate the effect of hybridization with Kevlar®49. Test results showed significant improvement on the impact performance of the unidirectional flax/epoxy laminate. Hybridization increased its energy penetration threshold three times and impact toughness five times. Conversely, it reduced the penetration threshold of the cross-ply flax/epoxy laminate by 10%; however, it more than doubled the impact toughness. The impact toughness the Kevlar-Flax/epoxy laminates were slightly higher than those of aluminum and CFRP’s, making them sustainable alternatives for impact applications.

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