Aerospace series. Fibre reinforced plastics. Test method. Determination of in-plane shear properties (± 45° tensile test)

2015 ◽  
Keyword(s):  
Tensile Test ◽  
Test Method ◽  
Plane Shear ◽  
Shear Properties ◽  
Reinforced Plastics

Effect of testing procedure on the in-plane shear properties of CNF/glass/epoxy composites

2019 ◽  
Vol 28 (3) ◽  
pp. 159-169 ◽  
Author(s):  
F Taheri-Behrooz ◽  
M Esmkhani ◽  
A Yaghoobi-Chatroodi
Keyword(s):  
Shear Modulus ◽  
Tensile Test ◽  
Fiber Orientation ◽  
Laminated Composites ◽  
Test Method ◽  
Fracture Plane ◽  
Testing Methods ◽  
Plane Shear ◽  
Shear Properties ◽  
Testing Procedures

Many investigations have demonstrated that the addition of nanoscale particles could affect in-plane shear properties of the laminated composites. Besides, a variety of testing procedures were introduced to evaluate the in-plane shear properties of the multiscale composite materials. In the current research, Iosipescu shear, double V-notched rail, and off-axis tensile testing methods were used to measure in-plane shear modulus and strength of the glass/epoxy and carbon nanofiber (CNF) as 0.25 wt% CNF/glass/epoxy laminated composites. In-plane shear properties of the CNF/glass/epoxy specimens were increased in comparison with the neat glass/epoxy specimens using all three testing procedures. However, the improvements were not identical for all the testing methods. The maximum improvements in the in-plane shear modulus and strength recorded using off-axis tensile test method were as 11% and 15.6%, respectively. In the off-axis tensile test method, all in-plane stress components are activated in the fracture plane parallel to the fiber orientation which are responsible for the failure initiation and propagation. Consequently, enhancing the resin’s mechanical property and interface bonding quality using CNF could remarkably enhance the in-plane shear property of the CNF/glass/epoxy specimens. On the other hand, the special fiber orientation of the specimens in Iosipescu shear and V-notched rail methods prevents the reinforcing effects of the CNF particles to be effectively revealed.

SHEAR PROPERTY OF STRUCTURAL EPOXY ADHESIVE EXPOSED TO TROPICAL WEATHERING CONDITION

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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