scholarly journals Controlling the Crack Propagation Path of the Veil Interleaved Composite by Fusion-Bonded Dots

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1260 ◽  
Author(s):  
Guangchang Chen ◽  
Jindong Zhang ◽  
Gang Liu ◽  
Puhui Chen ◽  
Miaocai Guo
Keyword(s):  
Crack Propagation ◽  
Propagation Path ◽  
Mode I ◽  
Fiber Breakage ◽  
Fracture Path ◽  
Interlaminar Fracture ◽  
Crack Propagation Path ◽  
Pull Out ◽  
Continuous Carbon Fiber ◽  
The Veil

This study investigated the effect of the fusion-bonded dots of veil interleaves on the crack propagation path of the interlaminar fracture of continuous carbon fiber reinforced epoxy resin. Two thin fiber layers (i.e., nylon veil (NV) with fusion-bonded dots and Kevlar veil (KV) physically stacked by fibers) were used to toughen composites as interleaves. Result shows that the existence of fusion-bonded dots strongly influenced the crack propagation and changed the interlaminar fracture mechanism. The Mode I fracture path of the nylon veil interleaved composite (NVIC) could propagate in the plane where the dots were located, whereas the path of the Kevlar veil interleaved composite (KVIC) randomly deflected inside the interlayer without the pre-cracking of the dots. The improvement of Mode I toughness was mainly based on fiber bridging and the resulting fiber breakage and pull-out. Fiber breakage was often observed for NVIC, whereas fiber pull-out was the main mechanism for KVIC. For the Mode II fracture path, the fusion-bonded NV dots guided the fracture path largely deflected inside the interlayer, causing the breakage of tough nylon fibers. The fracture path of the physically stacked KVIC occurred at one carbon ply/interlayer interface and only slightly deflected at fiber overlapped regions. Moreover, the fiber pull-out was often observed.

An Alternative Technique to Evaluate Crack Propagation Path in Hyperelastic Materials

2012 ◽  
Vol 40 (1) ◽  
pp. 42-58 ◽  
Author(s):  
R. R. M. Ozelo ◽  
P. Sollero ◽  
A. L. A. Costa
Keyword(s):  
Constitutive Model ◽  
Crack Propagation ◽  
Experimental Tests ◽  
Growth Direction ◽  
Propagation Path ◽  
J Integral ◽  
Alternative Technique ◽  
Crack Propagation Path ◽  
Hyperelastic Materials ◽  
Material Constitutive Model

Abstract REFERENCE: R. R. M. Ozelo, P. Sollero, and A. L. A. Costa, “An Alternative Technique to Evaluate Crack Propagation Path in Hyperelastic Materials,” Tire Science and Technology, TSTCA, Vol. 40, No. 1, January–March 2012, pp. 42–58. ABSTRACT: The analysis of crack propagation in tires aims to provide safety and reliable life prediction. Tire materials are usually nonlinear and present a hyperelastic behavior. Therefore, the use of nonlinear fracture mechanics theory and a hyperelastic material constitutive model are necessary. The material constitutive model used in this work is the Mooney–Rivlin. There are many techniques available to evaluate the crack propagation path in linear elastic materials and estimate the growth direction. However, most of these techniques are not applicable to hyperelastic materials. This paper presents an alternative technique for modeling crack propagation in hyperelastic materials, based in the J-Integral, to evaluate the crack path. The J-Integral is an energy-based parameter and is applicable to nonlinear materials. The technique was applied using abaqus software and compared to experimental tests.

Prediction Method of Three‐Dimensional Crack Propagation Path Based on Deep Learning Application

2020 ◽  
pp. 2001043
Author(s):  
Junxia Wang ◽  
Yuanjie Zheng ◽  
Rong Luo ◽  
Jun Ma ◽  
Yingjie Peng ◽  
...  
Keyword(s):  
Deep Learning ◽  
Crack Propagation ◽  
Three Dimensional ◽  
Prediction Method ◽  
Propagation Path ◽  
Crack Propagation Path

scholarly journals Improved Interlaminar Fracture Toughness and Electrical Conductivity of CFRPs with Non-Woven Carbon Tissue Interleaves Composed of Fibers with Different Lengths

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 803 ◽  
Author(s):  
Feng Xu ◽  
Bo Yang ◽  
Lijie Feng ◽  
Dedong Huang ◽  
Min Xia
Keyword(s):  
Electrical Conductivity ◽  
Fracture Toughness ◽  
Carbon Fibers ◽  
Mode I ◽  
Mode Ii ◽  
Thickness Direction ◽  
Interlaminar Fracture Toughness ◽  
Filtration Method ◽  
Interlaminar Fracture ◽  
Pull Out

Non-woven carbon tissue (NWCT) with different fiber lengths was prepared with a simple surfactant-assistant dispersion and filtration method and used as interleaving to enhance both delamination resistance and electrical conductivity of carbon fiber reinforced plastics (CFRPs) laminates. The toughing effect of NWCT on both Mode I and Mode II interlaminar fracture of CFRPs laminate is dependent on length of fibers, where the shorter carbon fibers (0.8 mm) perform better on Mode I interlaminar fracture toughness improvement whereas longer carbon fibers (4.3 mm) give more contribution to the Mode II interlaminar fracture toughness increase, comparing with the baseline composites, and the toughness increase was achieved without compromising of flexural mechanical properties. More interestingly, comparing with the baseline composites, the electrical conductivity of the interleaved composites exhibited a significant enhancement with in-plane and through-the-thickness direction, respectively. Microscopy analysis of the carbon tissue interleaving area in the laminate indicated that carbon fibers with shorter length can form into a 3D network with more fibers aligned along through-the-thickness direction compared with longer ones. The shorter fibers thus potentially provide more effective fiber bridges, pull-out and matrix deformation during the crack propagation and improve the electric conductivity significantly in through-the-thickness direction.

Predictions of Fatigue Crack Propagation Path and Life of High-Tension Steel in Residual Stress Fields.

1993 ◽  
Vol 59 (562) ◽  
pp. 1429-1436 ◽  
Author(s):  
Kiyotsugu Ohji ◽  
Masahiro Tsuji ◽  
Shiro Kubo ◽  
Yoshio Ono ◽  
Atsushi Yahata ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Stress Fields ◽  
Propagation Path ◽  
Crack Propagation Path ◽  
High Tension

Effect of Environmental Corrosion on Fatigue Crack Growth Morphology: A Detailed Investigation of the Boundary between Fatigue and Corrosion Control Regimes

2014 ◽  
Vol 891-892 ◽  
pp. 278-285
Author(s):  
Sandeep R. Shah ◽  
Ian L. Pryce ◽  
Todd B. St John ◽  
James M. Greer
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Driving Force ◽  
Galvanic Corrosion ◽  
Corrosion Damage ◽  
Propagation Path ◽  
Fatigue Properties ◽  
Mode I ◽  
Mode Ii ◽  
Element Analysis

Legacy 7XXX series aluminum alloys were developed primarily for their high strength with less regard for their fatigue properties, corrosion resistance and fracture toughness. The constituent alloying elements in these materials (used to achieve high strengths) markedly increased their corrosion susceptibility. Consequently, aircraft structures made from these alloys have exhibited fatigue and corrosion damage. In the present work, we have investigated a crack finding in a fuselage skin of AA7XXX series alloy. This investigation revealed the crack propagated by a combination of fatigue and corrosion. Through the use of extensive metallography, mechanical analysis and laboratory experiments, we have separated the contributions to the damage growth due to corrosion and fatigue. We have also confirmed that in-service mixed-mode failures like this, observed in these alloys, can be reproduced reliably in the laboratory. Furthermore, it was observed that the presence of corrosion can actually change the propagation of a fatigue crack from mode I, the preferable orientation for fatigue crack propagation, to mode II, the preferable orientation for corrosion propagation. Even though the mechanical driving force is enough to grow the crack in mode I, the presence of corrosion can change it to mode II by electrochemical degradation of the material. Using electrochemical measurements, we relate the change in failure mode to the frequency of cyclic loading. At slow enough cyclic frequency the electrochemical energy released due to galvanic corrosion degrades the material such that the crack turns and propagates in the orientation which has only one third the mechanical driving force as compared to the original crack propagation path. This is the first time such phenomenon has been successfully replicated in the laboratory and modeled with finite element analysis.

Modeling crack propagation path of anisotropic rocks using boundary element method

2008 ◽  
Vol 33 (9) ◽  
pp. 1227-1253 ◽  
Author(s):  
Chien-Chung Ke ◽  
Chao-Shi Chen ◽  
Cheng-Yu Ku ◽  
Chih-Hao Chen
Keyword(s):  
Boundary Element Method ◽  
Crack Propagation ◽  
Boundary Element ◽  
Propagation Path ◽  
Crack Propagation Path ◽  
Anisotropic Rocks ◽  
Element Method

Effect of a Circular Inclusion on Crack Propagation Path in a Plate under Tension

1997 ◽  
Vol 145-149 ◽  
pp. 61-70 ◽  
Author(s):  
Hironobu Nisitani ◽  
Akihide Saimoto
Keyword(s):  
Crack Propagation ◽  
Circular Inclusion ◽  
Propagation Path ◽  
Crack Propagation Path

Influence of high speed on crack propagation path in thin rim gears

2016 ◽  
Vol 40 (1) ◽  
pp. 120-129 ◽  
Author(s):  
F. Curà ◽  
A. Mura ◽  
C. Rosso
Keyword(s):  
Crack Propagation ◽  
High Speed ◽  
Propagation Path ◽  
Crack Propagation Path

scholarly journals Interlaminar Fracture of Stitched GFRP Laminates

1996 ◽  
Vol 5 (1) ◽  
pp. 096369359600500
Author(s):  
Rongzhi Li ◽  
Lin Ye ◽  
Yiu-Wing Mai
Keyword(s):  
Crack Propagation ◽  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Failure Mechanisms ◽  
Mode I ◽  
Interlaminar Fracture ◽  
Fracture Performance

The mode I interlaminar fracture of Kevlar thread stitched GFRP laminates has been studied using double-cantilever-beam (DCB) tests. It was found that stitching density and patterns influence interlaminar fracture performance of composites mainly through the different failure mechanisms of stitch threads during crack propagation.

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