Prediction of In-Plane Shear Properties of a Composite with Debonded Interface

The main objective of the present paper is to study the water absorption of jute–glass–carbon-reinforced epoxy composites and its subsequent effect on the in-plane shear performance of these composites. The effects of the reinforcement hybridization, stacking sequence and relative fabric amounts on the shear behavior of dry and wet conditioned composite specimens are reported and discussed. Composites have been fabricated in inter-ply configuration using the hand lay-up process. The prepared specimens have been subjected to distilled water and sea water immersion at room temperature for 60 days. Results indicated that water uptake of jute-reinforced composite and its hybrids with glass and/or carbon follows Fickian-like behavior. Water uptake induces a significant decrease in the in-plane shear strength. Hybridizing jute fabric with glass and/or carbon fabrics improves the in-plane shear properties of both dry and wet specimens. The stacking sequence and relative fabric amounts have a noticeable effect on the studied shear properties. Also, the hybrid composite with jute as facings and glass as core, JGJ, offers the most balanced set of properties on a cost-effective basis compared to the other studied hybrids.

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Flexural, in-plane shear and nail shear properties of falcataria-rubberwood laminated veneer board for flooring

Holzforschung ◽

10.1515/hf.2008.111 ◽

2008 ◽

Vol 62 (6) ◽

Author(s):

Kweonhwan Hwang ◽

EeDing Wong ◽

Kohei Komatsu

Keyword(s):

Radiata Pine ◽

Strength Properties ◽

Larix Leptolepis ◽

Structural Components ◽

Shear Tests ◽

Plane Shear ◽

Paraserianthes Falcataria ◽

Shear Properties ◽

Laminated Veneer Lumber ◽

Good Potential

Abstract A research project has been conducted to develop structural laminated veneer lumber products from tropical wood, and to evaluate their feasibility for the structural components of wooden houses. As part of this project, we investigated the flexural, in-plane shear, and nail shear properties of laminated veneer board (LVB) manufactured from a combination of falcataria (Paraserianthes falcataria) and rubberwood (Hevea brasiliensis) for flooring applications. In addition, 11-ply larch (Larix leptolepis) and 7-ply radiata pine (Pinus radiata) plywood were investigated as controls. Larch plywood, bonded with phenol-based adhesive, showed the best strength properties in bending and shear tests, whereas the 12-ply (28 mm thick) resorcinol-based resin-bonded LVB had the highest ductility in nail shear. The LVB also had better bending and shear properties than radiata pine plywood. In conclusion, falcataria-rubberwood LVB demonstrated good potential to substitute larch plywood and radiata pine plywood in flooring applications.

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Out-of-plane shear properties of glass/epoxy composites enhanced with carbon-nanofibers

Polymer Testing ◽

10.1016/j.polymertesting.2016.09.003 ◽

2016 ◽

Vol 55 ◽

pp. 278-286 ◽

Cited By ~ 11

Author(s):

F. Taheri-Behrooz ◽

M. Esmkhani ◽

A. Yaghoobi-Chatroodi ◽

S.M. Ghoreishi

Keyword(s):

Carbon Nanofibers ◽

Epoxy Composites ◽

Plane Shear ◽

Shear Properties ◽

Out Of Plane

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SHEAR PROPERTY OF STRUCTURAL EPOXY ADHESIVE EXPOSED TO TROPICAL WEATHERING CONDITION

Jurnal Teknologi ◽

10.11113/jt.v77.6158 ◽

2015 ◽

Vol 77 (8) ◽

Author(s):

Shukur Abu Hassan ◽

Yob Saed Ismail ◽

Abdul Rahman Mohd. Sam ◽

Umar Abdul Hanan ◽

Mat Uzir Wahit

Keyword(s):

Structural Integrity ◽

Elevated Temperatures ◽

Salt Water ◽

Epoxy Adhesive ◽

Test Method ◽

Plain Water ◽

Plane Shear ◽

Shear Properties ◽

Shear Property ◽

Epoxy Material

As a consequence of tropical climate featuring abundant rain and sunshine throughout the year, adhesive bonded joints undergo substantial exposure to moisture and elevated temperatures. It is known that the degradation of adhesive materials such as structural epoxy due to weathering could affect the overall bond performance of structural integrity of reinforced concrete such as carbon fibre reinforced polymer composites (CFRP) plate system. The objective of the study is to investigate the in-plane shear properties of structural epoxy material exposed to tropical environmental conditions using Arcan Test Method. The epoxy adhesive was casted in a closed metal mould to produce butterfly shaped specimens. The specimens were exposed to four conditions; laboratory, outdoor, plain water, and salt water. The specimens were tested for shear properties and failed in brittle form. Microstructure analysis was performed to study the fracture surface of the test specimens. The study showed that the tropical exposure conditions influenced the shear strength of the epoxy material, especially for those exposed to plain and salt water conditions, which were 32% lower than the control specimen for specimens exposed to plain water followed by salt water (26.6%), laboratory (25.4%) and finally outdoor (18.4%).

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