Shape memory characteristics of woven glass fibre fabric reinforced epoxy composite in flexure

Fejős, Márta; Romhány, Gábor; Karger‐Kocsis, J.

doi:10.1177/0731684412461541

Cited by 57 publications

(44 citation statements)

References 16 publications

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“…40 MPa). Parallel to that the critical bending strain, not causing observable damage, was highly reduced compared to neat EP (from >6% to 1%) [53]. In a follow-up study, Fejős and Karger-Kocsis [54] studied the SM properties of CF fabric-reinforced composites in bending.…”

Section: Fiber-and Fabric-reinforcedmentioning

confidence: 86%

Recent advances in shape memory epoxy resins and composites

Karger‐Kocsis

Kéki

2015

Multifunctionality of Polymer Composites

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Section: Fiber-and Fabric-reinforcedmentioning

confidence: 86%

Recent advances in shape memory epoxy resins and composites

Karger‐Kocsis

Kéki

2015

Multifunctionality of Polymer Composites

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“…The triepoxide and the diamine hardener were mixed in stoichiometric ratio. EP was produced by pouring this mixture into a glass mould [18]. Asymmetrically reinforced composites were fabricated in two steps.…”

Section: Methodsmentioning

confidence: 99%

“…Less attention was devoted to traditional reinforcements such as fibres in various assemblies (woven, unidirectional, nonwoven etc. [17][18][19]). This is possibly due to the facts that (i) the ratio of the glassy to the rubbery modulus decreases with the reinforcement and (ii) the deformability of the composite may be markedly hampered.…”

mentioning

confidence: 99%

Shape memory performance of asymmetrically reinforced epoxy/carbon fibre fabric composites in flexure

Fejős¹,

Karger‐Kocsis

2013

Express Polym. Lett.

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Shape memory polymers (SMPs) belong to an emerging and fast developing branch of smart materials. SMPs can fix temporary shapes and recover their original one upon exposure to external stimuli. According to the latter SMPs can be grouped in thermal-, electro-, magnetic-, light-, solution (water)-activated versions. Other categorizations consider the chemical structure, the number of shapes SMP can memorize in one cycle and the possibility to repeat temporary/original shaping just upon external stimulus [1][2][3]. Nowadays, exhaustive reviews are available on the structure, properties and applications of SMPs [2][3][4][5]. SMPs consist of permanent netpoints and molecular switches of reversible nature. The latter are exploited for setting the temporary shape whereas the former memorize the original shape. For cured thermosets the netpoints are given by covalent crosslinks of the chemical network. This network architecture enables keeping the stable (original) shape also after recovery. The segments between the crosslinks act as molecular switches. They undergo a reversible phase transition at the glass transition temperature (T g ) range upon heating, where heating is the external stimulus. The transition between the glassy and rubbery states is associated with a large drop in the modulus of SMPs (covering almost 3 orders of magnitude). Temporary shaping, performed in the rubbery state, yields a conformational rearrangement in the segments of the chemically crosslinked structure. This causes a prominent entropy reduction. The shape is fixed upon cooling to the glassy state whereby energy is stored via 'freezing in' the related network deformation. When the material is heated above the T g again, the stored energy is released by Abstract. In this study asymmetrically reinforced epoxy (EP)/carbon fibre (CF) fabric composites were prepared and their shape memory properties were quantified in both unconstrained and fully constrained flexural tests performed in a dynamic mechanical analyser (DMA). Asymmetric layering was achieved by incorporating two and four CF fabric layers whereby setting a resin-and reinforcement-rich layer ratio of 1/4 and 1/2, respectively. The recovery stress was markedly increased with increasing CF content. The related stress was always higher when the CF-rich layer experienced tension load locally. Specimens with CF-rich layers on the tension side yielded better shape fixity ratio, than those with reinforcement layering on the compression side. Cyclic unconstrained shape memory tests were also run up to five cycles on specimens having the CF-rich layer under local tension. This resulted in marginal changes in the shape fixity and recovery ratios.

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“…Their shape memory characteristics were determined in 3-point bending tests in a dynamic mechanical analyzer (DMA) [4][5].…”

Section: Methodsmentioning

confidence: 99%

Temperature-Induced Shape Memory Characteristics of Epoxy Resin-Based Fabric-Reinforced Composites

Karger‐Kocsis

2013

AMR

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Shape memory characteristics of woven glass and carbon fiber fabric reinforced epoxy resin-based composites were assessed in bending mode using a dynamic mechanical analyzer. The reinforcement strongly improved the recovery stress but impaired the bending deformability. Composites with asymmetric fabric lay-up showed better performance when the reinforced section experienced local tension than compression during flexural loading.

show abstract

Shape memory characteristics of woven glass fibre fabric reinforced epoxy composite in flexure

Cited by 57 publications

References 16 publications

Recent advances in shape memory epoxy resins and composites

Recent advances in shape memory epoxy resins and composites

Shape memory performance of asymmetrically reinforced epoxy/carbon fibre fabric composites in flexure

Temperature-Induced Shape Memory Characteristics of Epoxy Resin-Based Fabric-Reinforced Composites

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