scholarly journals Effects of Specimen Configuration and Fiber Orientation on In-plane Shear Testing Methods for Advanced Composite Panels.

1993 ◽  
Vol 19 (4) ◽  
pp. 146-151
Author(s):  
H. IWAI ◽  
M. UEMURA
Keyword(s):  
Fiber Orientation ◽  
Composite Panels ◽  
Testing Methods ◽  
Shear Testing ◽  
Plane Shear ◽  
Advanced Composite

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.

scholarly journals Strain rate and thermal softening effects in shear testing of AA7075-T6 sheet

2018 ◽  
Vol 183 ◽  
pp. 02037 ◽  
Author(s):  
Taamjeed Rahmaan ◽  
Ping Zhou ◽  
Cliff Butcher ◽  
Michael J. Worswick
Keyword(s):  
Strain Rate ◽  
High Speed ◽  
Rate Sensitivity ◽  
Thermal Conditions ◽  
Shear Loading ◽  
Image Correlation ◽  
High Rate ◽  
Strain Rates ◽  
Shear Testing ◽  
Plane Shear

Shear tests were performed at strain rates ranging from quasi-static (0.01 s-1) to 500 s-1 for AA7075-T6 sheet metal alloy at room temperature. A miniature sized shear specimen was used in this work to perform high strain rate shear testing. Digital image correlation (DIC) techniques were employed to measure the strains in the experiments. At maximum in-plane shear strains greater than 20%, the AA7075-T6 alloy demonstrated a reduced work hardening rate at elevated strain rates. At lower strains, the AA7075-T6 alloy showed mild positive rate sensitivity. The strain to localization (using the Zener-Holloman criterion), measured using the DIC technique, decreased with strain rate in shear loading. The strain at complete failure, however, exhibited an increase at the highest strain rate (500 s-1). The current work also focused on characterization of the thermal conditions occurring during high rate loading in shear with in situ high speed thermal imaging. Experimental results from the highest strain rate (500 s-1) tests showed a notable increase in temperature within the specimen gauge region as a result of the conversion of plastic deformation energy into heat.

Out-of-Plane Shear Properties of IM7/8552 Carbon/Epoxy by V-notched Shear Testing

2020 ◽  
Author(s):  
Rudy T. Haluza ◽  
Kevin Koudela ◽  
Charles Bakis ◽  
Daniel O. Adams ◽  
Mark A. Perl ◽  
...  
Keyword(s):  
Shear Testing ◽  
Plane Shear ◽  
Shear Properties ◽  
Out Of Plane

Z-direction fiber orientation in paperboard

TAPPI Journal ◽  
2010 ◽  
Vol 9 (10) ◽  
pp. 25-32
Author(s):  
JOHN M. CONSIDINE ◽  
DAVID W. VAHEY ◽  
ROLAND GLEISNER ◽  
ALAN RUDIE ◽  
SABINE ROLLAND DU ROSCOAT ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Shear Strength ◽  
Bond Strength ◽  
Fiber Orientation ◽  
Internal Bond ◽  
Internal Bond Strength ◽  
Shear Deformations ◽  
Plane Shear ◽  
Conventional Tests ◽  
Out Of Plane

This work evaluated the use of conventional tests to show beneficial attributes of z-direction fiber orientation (ZDFO) for structural paperboards. A survey of commercial linerboards indicated the presence of ZDFO in one material that had higher Taber stiffness, out-of-plane shear strength, directional dependence of Scott internal bond strength and directional brightness. Laboratory handsheets were made with a specialized procedure to produce ZDFO. Handsheets with ZDFO had higher out-of-plane shear strength than handsheets formed conventionally. Materials with high out-of-plane shear strength had greater bending stiffness and compressive strength because of their ability to resist shear deformations.

Sign in / Sign up

Export Citation Format

Share Document