scholarly journals New Test Method for Mode II Interlaminar Fracture Toughness of Composite Laminates: Doubly End-Notched Tension Method

2018 ◽  
Vol 44 (1) ◽  
pp. 19-24
Author(s):  
Shigeki YASHIRO ◽  
Toshihide AGATA ◽  
Akinori YOSHIMURA
Keyword(s):  
Fracture Toughness ◽  
Composite Laminates ◽  
Test Method ◽  
Mode Ii ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture

Interlaminar Fracture Toughness of Composite Laminate with Splicing Plies

2011 ◽  
Vol 194-196 ◽  
pp. 1697-1702
Author(s):  
Li Liang ◽  
Pu Rong Jia ◽  
Gui Qiong Jiao
Keyword(s):  
Fracture Toughness ◽  
Composite Laminates ◽  
Tensile Testing ◽  
Mode Ii ◽  
Interlaminar Fracture Toughness ◽  
Fiber Reinforced ◽  
Interlaminar Fracture ◽  
Mode Ii Fracture ◽  
Mode Ii Fracture Toughness ◽  
Delamination Failure

Delamination is one of the important damage modes in the fiber-reinforced composite laminates. The interlaminar fracture toughness is the key parameter in delamination failure analysis of composites. The stress analysis by a finite element modeling has shown that the shear stress is very large near the ply splicing area. So the delamination failure is mainly dependent on the mode II fracture toughness. A new way of loading in tensile testing is proposed for the measurement of mode II fracture toughness. Specific specimen with splicing plies has been designed and used for the experiment. Testing study on the carbon-fiber-reinforced laminate with ply splicing was performed. Steady crack propagation has been seen by the tensile testing of the specimen. Mode II fracture toughness GIIC of the laminate has been determined by the experiment data analysis. The experiment and numerical analysis shows that the tensile testing for the measurement of mode II interlaminar fracture toughness is feasible.

Novel Test Method for Mixed Mode II and III Interlaminar Fracture Toughness

2010 ◽  
Vol 19 (4) ◽  
pp. 349-361 ◽  
Author(s):  
Hiroshi Suemasu ◽  
Atsushi Kondo ◽  
Katsuhisa Gozu ◽  
Yuichiro Aoki
Keyword(s):  
Fracture Toughness ◽  
Mixed Mode ◽  
Test Method ◽  
Mode Ii ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture

Improvement of Vibration Damping Capacity and Fracture Toughness in Composite Laminates by the Use of Polymeric Interleaves

1999 ◽  
Author(s):  
Ronald F. Gibson ◽  
Hui Zhao
Keyword(s):  
Fracture Toughness ◽  
Composite Laminates ◽  
Critical Thickness ◽  
Vibration Damping ◽  
Thickness Effect ◽  
Damping Capacity ◽  
Mode Ii ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture ◽  
Mode Ii Fracture Toughness

Abstract It is shown that simultaneous improvement of vibration damping capacity and interlaminar fracture toughness in composite laminates can be achieved by using polymeric interleaves between the composite laminae. The specific case of Mode II interlaminar fracture toughness and flexural damping capacity of interleaved composite laminates is studied. Graphite/epoxy, E-glass/epoxy and E-glass/polyetherimide composite laminates with polymeric interleaves of several different thicknesses and materials were tested using both the end notch flexure (ENF) test for Mode II fracture toughness and the impulse-frequency response test for flexural damping capacity. The Mode II energy release rate GIIc for all three composites increased linearly with increasing interleaf thickness up to a critical thickness, then dropped off with further increases in thickness. The damping loss factor η for all three composites increased linearly with increasing interleaf thickness up to the maximum thickness. Analytical models for predicting the influence of interleaves on GIIc and η are developed, along with a hypothesis for the critical thickness effect with regard to fracture toughness.

Experimental Investigation of Interlaminar Fracture Toughness of CFRP Composites with Different Stitching Patterns

2005 ◽  
Vol 297-300 ◽  
pp. 189-194 ◽  
Author(s):  
Hong Ping Zhao ◽  
Robert Kwok Yiu Li ◽  
Xi Qiao Feng
Keyword(s):  
Fracture Toughness ◽  
Composite Laminates ◽  
Test Method ◽  
Mode I ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture ◽  
Reinforced Plastics ◽  
Mode I Fracture Toughness ◽  
Straight Line ◽  
Delamination Resistance

Through-thickness stitching is one of the most effective techniques to improve the delamination resistance of composite laminates. The effects of two different stitching patterns on the mode-I interlaminar fracture toughness of unidirectional carbon fiber reinforced plastics (CFRP) are examined experimentally in the present paper by using the double cantilever beam (DCB) test method. It is found that the zigzag stitching pattern results in a better toughening effect than the straight line pattern, and that the stitching density also has a considerable influence on the mode-I fracture toughness.

Study on the Mode I Interlaminar Fracture Toughness of Multi-Directional Composite Laminates

2013 ◽  
Vol 718-720 ◽  
pp. 186-190 ◽  
Author(s):  
Zong Hong Xie ◽  
Xiang Li ◽  
Jian Zhao ◽  
Jie Hao ◽  
Yan Peng Sun ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Composite Laminates ◽  
Testing Machine ◽  
Beam Theory ◽  
Test Method ◽  
Resin Matrix ◽  
Mode I ◽  
Interlaminar Fracture Toughness ◽  
Bismaleimide Resin ◽  
Interlaminar Fracture

The double cantilever beam (DCB) test method and the modified beam theory are adopted to investigate the Mode I interlaminar fracture toughness of multi-directional composite laminates. The test procedure was developed by using a stereoscopic microscope to observe the delamination front tip and a testing machine to record the displacement and load data. A dial indicator was used to eliminate the error due to initial clearance in the clamp. A modified beam theory and a compliance calibration method were used to calculate the interlaminar fracture toughness. The Mode I interlaminar fracture toughness of carbon fiber reinforced bismaleimide resin matrix (BMI) composite laminates with four different interface patterns ( 0/0, 45/-45, 0/-45 and 0/90, respectively) was obtained. The results show that the patterns of interface ply angles have an obvious influence on Mode I interlaminar fracture toughness of composite laminates.

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