Fibre bridging in double cantilever beam specimens and its effect on mode I interlaminar fracture toughness

1992 ◽  
Vol 11 (22) ◽  
pp. 1537-1539 ◽  
Author(s):  
Lin Ye ◽  
K. Friedrich
Keyword(s):  
Fracture Toughness ◽  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Mode I ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture ◽  
Fibre Bridging

Double Cantilever Beam Measurement and Finite Element Analysis of Cryogenic Mode I Interlaminar Fracture Toughness of Glass-Cloth/Epoxy Laminates

2000 ◽  
Vol 123 (2) ◽  
pp. 191-197 ◽  
Author(s):  
Y. Shindo ◽  
K. Horiguchi ◽  
R. Wang ◽  
H. Kudo
Keyword(s):  
Fracture Toughness ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Mode I ◽  
Interlaminar Fracture Toughness ◽  
Element Analysis ◽  
Interlaminar Fracture ◽  
Delamination Crack

An experimental and analytical investigation in cryogenic Mode I interlaminar fracture behavior and toughness of SL-E woven glass-epoxy laminates was conducted. Double cantilever beam (DCB) tests were performed at room temperature (R.T.), liquid nitrogen temperature (77 K), and liquid helium temperature (4 K) to evaluate the effect of temperature and geometrical variations on the interlaminar fracture toughness. The fracture surfaces were examined by scanning electron microscopy to verify the fracture mechanisms. A finite element model was used to perform the delamination crack analysis. Critical load levels and the geometric and material properties of the test specimens were input data for the analysis which evaluated the Mode I energy release rate at the onset of delamination crack propagation. The results of the finite element analysis are utilized to supplement the experimental data.

Determination of mode I interlaminar fracture toughness of C/SiC composite using taped double cantilever beam and J integral

2021 ◽  
pp. 1-9
Author(s):  
Wu Xu ◽  
J.C Ding ◽  
Jingran Ge ◽  
Qi Zhang
Keyword(s):  
Fracture Toughness ◽  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Ceramic Matrix Composite ◽  
Mode I ◽  
Complex Data ◽  
J Integral ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture

Abstract Due to the low in-plane strength of C/SiC ceramic matrix composite (CMC), arm failure may occur in the classical double cantilever beam (DCB) test for determination of the mode I interlaminar fracture toughness. A taped DCB (TDCB) is proposed to avoid this undesired failure mode. Exact and explicit J integral for the TDCB is derived and applied to measure the interlaminar fracture toughness of CMC. The present TDCB and J integral are demonstrated to be simple and reliable for determining the interlaminar fracture toughness, without visual measurement of the delamination length and complex data reduction.

CLOSED-FORM J-INTEGRAL AND ITS APPLICATIONS FOR MEASUREMENT OF MODE I INTERLAMINAR FRACTURE TOUGHNESS OF COMPOSITES

2021 ◽  
Author(s):  
WU XU ◽  
JIANCAN DING
Keyword(s):  
Fracture Toughness ◽  
Closed Form ◽  
Large Deformation ◽  
Cantilever Beam ◽  
Integral Method ◽  
Double Cantilever Beam ◽  
J Integral ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture

Due to the interlaminar properties of composites are low, delamination is one of the major failure modes. It threatens the safety of composite structure subjected to out-of-plane static and especially impact loadings. High interlaminar fracture toughness is demanded in the society where composite structures are widely used. However, for tough material, large deformation may occur in the determination of the interlaminar fracture toughness when using the double cantilever beam (DCB) test. Therefore, accurate determination of the fracture toughness of tough material and dynamic loading is very challenging under large deformation. J-integral is an important parameter in fracture mechanics. It’s equivalent to energy release rate under monotonic loading and widely used in the determination of interlaminar fracture toughness of composites. In this paper, it is used to determine the fracture toughness for composite DCB under large deformation and wedge-insert double cantilever beam (WDCB) test, which is widely used to determine the dynamic interlaminar fracture toughness. Exact and closed form nonlinear J-integrals are derived for the largely deformed DCB and WDCB. Compared with the alternative data reduction methods for determining interlaminar fracture toughness, the J- integral method is more accurate. In addition, the J-integral method is simple and promising, since it is unnecessary to measure the crack length in the tests.

Interlaminar fracture toughness of GLARE laminates based on asymmetric double cantilever beam (ADCB)

2019 ◽  
Vol 163 ◽  
pp. 175-184 ◽  
Author(s):  
Xiaoge Hua ◽  
Huaguan Li ◽  
Yi Lu ◽  
Yujie Chen ◽  
Liangsheng Qiu ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture

Recovery of Mode I self-healing interlaminar fracture toughness of fiber metal laminate by modified double cantilever beam test

2019 ◽  
Vol 16 ◽  
pp. 25-29 ◽  
Author(s):  
Logesh Shanmugam ◽  
Minoo Naebe ◽  
Jooheon Kim ◽  
Russell J. Varley ◽  
Jinglei Yang
Keyword(s):  
Fracture Toughness ◽  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Mode I ◽  
Self Healing ◽  
Interlaminar Fracture Toughness ◽  
Beam Test ◽  
Fiber Metal Laminate ◽  
Fiber Metal ◽  
Double Cantilever Beam Test

Effect of Silane Concentrations on Mode I Interlaminar Fracture of Woven Silk/Epoxy Composites

2010 ◽  
Vol 150-151 ◽  
pp. 1171-1175 ◽  
Author(s):  
Zulkifli R. ◽  
Che Husna Azhari
Keyword(s):  
Fracture Toughness ◽  
Surface Treatment ◽  
Processing Technique ◽  
Epoxy Composites ◽  
Composite Panel ◽  
Mode I ◽  
Silk Fibre ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture ◽  
Fibre Bridging

The aim of the project is to study the effect of silane concentrations on the interlaminar fracture toughness, GIC of silk/epoxy composites. Woven silk fibre has been treated with five different silane concentrations and fabricated into a panel with two layers of silk fibre. The processing technique used to prepare the sample is by a vacuum bag in an autoclave. Six sets of panels were fabricated based on different 3-aminopropyl triethoxysilane silane concentrations which include one sets of specimens without treatment for comparison. Mode I test based on double cantilever beam specimens (DCB) method has been used over all the specimens. The results of the GIC were plotted and compared with the untreated composites panel. GIC of the composite has been found to increase when the silane concentrations exceeded certain minimum silane contents of 15 ml. During the test, crack propagation is stable and no fibre bridging occurred between both sides of fracture surfaces. All the failure that occurred were at the fibre-matrix interface. The GIC of woven silk/epoxy composites can be enhanced by surface treatment using coupling agent. Surface treatment has affected the properties of the composite panel by increasing the interlaminar fracture toughness by a maximum of 53% at a 5.8vol% silane concentrations.

Sign in / Sign up

Export Citation Format

Share Document