Analysis and modelling of cutting forces during the trimming of unidirectional CFRP composite laminates

Author(s):  
Imed Zaghbani ◽  
Jean Francois Chatelain ◽  
Sébastien Berube ◽  
Victor Songmene ◽  
Justin Lance
2015 ◽  
Vol 1125 ◽  
pp. 121-125 ◽  
Author(s):  
Muhammad A'imullah Abdullah ◽  
Mohammad Reza Arjmandi ◽  
Seyed Saeid Rahimian Koloor ◽  
King Jye Wong ◽  
Mohd Nasir Tamin

This paper provides quantitative description of interlaminar damage process in CFRP composite laminates under cyclic shear loading. Quasi-static end-notched flexural (ENF) test on 16-ply CFRP composite laminate beam, [0]16 and its complementary validated FE model provide the reference “no-interlaminar damage” condition. Two identical ENF samples were fatigue to 50000 cycles, but at different load amplitude of 90 and 180 N, respectively (Load ratio, R = 0.1) to induce selectively property degradation at the interface crack front region. Subsequent quasi-static ENF tests establish the characteristic of the interlaminar damage degradation. The residual peak load for the fatigued ENF samples is measured at 1048 and 914 N for the load amplitude of 90 and 180 N, respectively. Cyclic interlaminar shear damage is represented by a linear degradation of the residual critical energy release rate, GIIC with the accumulated damage. Reasonably close comparisons of the predicted residual load-displacement responses with measured curves serve to verify the suitability of the assumed bilinear traction-separation law for the cyclic cohesive zone model (CCZM) used.


2001 ◽  
Vol 32 (8) ◽  
pp. 669-682 ◽  
Author(s):  
Kwang-Hee Im ◽  
Cheon-Seok Cha ◽  
Sun-Kyu Kim ◽  
In-Young Yang

2016 ◽  
Vol 878 ◽  
pp. 70-73 ◽  
Author(s):  
Kwang Hee Im ◽  
Sun Kyu Kim ◽  
David K. Hsu ◽  
Jong An Jung

Recently, terahertz ray imaging has emerged as one of the most promising new powerful nondestructive evaluation (NDE) techniques for the area applications. In this study, a new time-domain spectroscopy system was utilized for measuring the coating thickness on CFRP composite laminates. Extensive experimental measurements in reflection mode were made to map out the T-ray images. Also, the refractive index was estimated based on the electromagnetic properties. The CFRP composite laminates were observed in reflection mode and limitations will be discussed in the T-ray processing. By using these characterized material properties, the characteristics was successfully demonstrated for T-ray behavior propagating through the Shim Stock films for acquiring the refractive index. The T-ray technique has been developed for the measurement of the thickness of the Shim Stock films and the coating thickness on CFRP composites. Good results have been obtained in tests made on the thickness of the standard film samples with the coating thickness ranging from around hundreds of μm.


Author(s):  
R. Bhoominathan ◽  
P. Divyabarathi ◽  
R. Manimegalai ◽  
T. Nithya ◽  
S. Shanmugapriya

Generally, the aircraft structural parts are economically high in cost so the materials need to be inspected for defects or damages using various non-destructive testing (NDT) methods like ultrasonic, thermography and acoustic emission. The aim of this project is to characterize the defects in composite laminates before and after the flexural loading using infra-red thermography NDT method. GFRP and hybrid (GFRP+CFRP) composite laminates are fabricated with different orientation such as uni-directional, cross ply, anti-symmetric and angle ply and then tested under flexural loading according to ASTM D790 standard. The volume fraction of the fibre and matrix needs to be found out to know the void content and the mixing ratio of reinforcement and binder.


2008 ◽  
Vol 2008 (0) ◽  
pp. _OS0611-1_-_OS0611-2_
Author(s):  
Naoki Hori ◽  
Masahiro Arai ◽  
Ning Hu ◽  
Hisao Fukunaga

Sign in / Sign up

Export Citation Format

Share Document