scholarly journals Self-Healing Composite Structures Using Multiple Through-thickness Microvascular Channels

2020 ◽  
Vol 46 (6) ◽  
pp. 231-239
Author(s):  
Yoshiki Kato ◽  
Shu Minakuchi ◽  
Shinji Ogihara ◽  
Nobuo Takeda
Keyword(s):  
Composite Structures ◽  
Self Healing

Self Healing of Epoxy Composite for Aircraft's Structural Applications

2008 ◽  
Vol 136 ◽  
pp. 39-44 ◽  
Author(s):  
Willy C.K. Tan ◽  
J.C. Kiew ◽  
K.Y. Siow ◽  
Z.R. Sim ◽  
H.S. Poh ◽  
...  
Keyword(s):  
Composite Structures ◽  
Polymeric Materials ◽  
Hollow Fibre ◽  
The Body ◽  
Strength Increase ◽  
Self Healing ◽  
Structural Applications ◽  
Self Repair ◽  
Repair Systems ◽  
Point Bend

When one cut himself, it's amazing to watch how quickly the body acts to mend the wound. Immediately, the body works to pull the skin around the cut back together. The concept of repair by bleeding of enclosed functional agents serves as the biomimetric inspiration of synthetic self repair systems. Such synthetic self repair systems are based on advancement in polymeric materials; the process of human thrombosis is the inspiration for the application of self healing fibres within the composite materials. Preliminary results based on flexural 3 point bend test on prepared samples have shown the healed hollow fibre laminate has a healed strength increase of 47.6% compared to the damaged baseline laminate. These results gave us confidence that there is a great potential to adopt such self healing mechanism on actual composite parts like in aircraft’s composite structures.

A probabilistic approach for design and certification of self-healing advanced composite structures

2011 ◽  
Vol 225 (4) ◽  
pp. 435-449 ◽  
Author(s):  
H R Williams ◽  
R S Trask ◽  
I P Bond
Keyword(s):  
Composite Structures ◽  
High Performance ◽  
Probabilistic Approach ◽  
Healing Time ◽  
Self Healing ◽  
Structural Failure ◽  
Healing System ◽  
Order Of Magnitude ◽  
Damage Tolerant

Design and certification of novel self-healing aerospace structures was explored by reviewing the suitability of conventional deterministic certification approaches. A sandwich structure with a vascular network self-healing system was used as a case study. A novel probabilistic approach using a Monte Carlo method to generate an overall probability of structural failure yields notable new insights into design of self-healing systems, including a drive for a faster healing time of less than two flight hours. In the case study considered, a mature self-healing system could be expected to reduce the probability of structural failure (compared to a conventional damage-tolerant construction) by almost an order of magnitude. In a risk-based framework this could be traded against simplified maintenance activity (to save cost) and/or increased allowable stress (to allow a lighter structure). The first estimate of the increase in design allowable stresses permitted by a self-healing system is around 8 per cent, with a self-healing system much lighter than previously envisaged. It is thought these methods and conclusions could have wider application to self-healing and conventional high-performance composite structures.

Self-healing sandwich composite structures

2012 ◽  
Author(s):  
D. Fugon ◽  
C. Chen ◽  
K. Peters
Keyword(s):  
Composite Structures ◽  
Sandwich Composite ◽  
Self Healing

scholarly journals Bioinspired engineering study of Plantae vascules for self-healing composite structures

2009 ◽  
Vol 7 (47) ◽  
pp. 921-931 ◽  
Author(s):  
R. S. Trask ◽  
I. P. Bond
Keyword(s):  
Compressive Strength ◽  
Polymer Composite ◽  
Composite Structures ◽  
Composite Laminate ◽  
Impact Damage ◽  
Self Healing ◽  
Premature Failure ◽  
Residual Compressive Strength ◽  
Engineering Study ◽  
Local Host

This paper presents the first conceptual study into creating a Plantae-inspired vascular network within a fibre-reinforced polymer composite laminate, which provides an ongoing self-healing functionality without incurring a mass penalty. Through the application of a ‘lost-wax’ technique, orthogonal hollow vascules, inspired by the ‘ray cell’ structures found in ring porous hardwoods, were successfully introduced within a carbon fibre-reinforced epoxy polymer composite laminate. The influence on fibre architecture and mechanical behaviour of single vascules (located on the laminate centreline) when aligned parallel and transverse to the local host ply was characterized experimentally using a compression-after-impact test methodology. Ultrasonic C-scanning and high-resolution micro-CT X-ray was undertaken to identify the influence of and interaction between the internal vasculature and impact damage. The results clearly show that damage morphology is influenced by vascule orientation and that a 10 J low-velocity impact damage event is sufficient to breach the vasculature; a prerequisite for any subsequent self-healing function. The residual compressive strength after a 10 J impact was found to be dependent upon vascule orientation. In general, residual compressive strength decreased to 70 per cent of undamaged strength when vasculature was aligned parallel to the local host ply and a value of 63 per cent when aligned transverse. This bioinspired engineering study has illustrated the potential that a vasculature concept has to offer in terms of providing a self-healing function with minimum mass penalty, without initiating premature failure within a composite structure.

scholarly journals The Self-Healing Capability of Carbon Fibre Composite Structures Subjected to Hypervelocity Impacts Simulating Orbital Space Debris

2012 ◽  
Vol 2012 ◽  
pp. 1-16 ◽  
Author(s):  
B. Aïssa ◽  
K. Tagziria ◽  
E. Haddad ◽  
W. Jamroz ◽  
J. Loiseau ◽  
...  
Keyword(s):  
Composite Structures ◽  
Space Debris ◽  
Fibre Composite ◽  
Space Station ◽  
Short Review ◽  
Hypervelocity Impact ◽  
The Self ◽  
Space Environment ◽  
Self Healing ◽  
Carbon Fibre Composite

The presence in the space of micrometeoroids and orbital debris, particularly in the lower earth orbit, presents a continuous hazard to orbiting satellites, spacecrafts, and the international space station. Space debris includes all nonfunctional, man-made objects and fragments. As the population of debris continues to grow, the probability of collisions that could lead to potential damage will consequently increase. This work addresses a short review of the space debris “challenge” and reports on our recent results obtained on the application of self-healing composite materials on impacted composite structures used in space. Self healing materials were blends of microcapsules containing mainly various combinations of a 5-ethylidene-2-norbornene (5E2N) and dicyclopentadiene (DCPD) monomers, reacted with ruthenium Grubbs' catalyst. The self healing materials were then mixed with a resin epoxy and single-walled carbon nanotubes (SWNTs) using vacuum centrifuging technique. The obtained nanocomposites were infused into the layers of woven carbon fibers reinforced polymer (CFRP). The CFRP specimens were then subjected to hypervelocity impact conditions—prevailing in the space environment—using a home-made implosion-driven hypervelocity launcher. The different self-healing capabilities were determined and the SWNT contribution was discussed with respect to the experimental parameters.

Reflexive composites: self-healing composite structures

2008 ◽  
Author(s):  
Thomas W. Margraf, Jr. ◽  
Thomas J. Barnell ◽  
Ernie Havens ◽  
Christopher D. Hemmelgarn
Keyword(s):  
Composite Structures ◽  
Self Healing

A novel self-healing composite made of thermally reversible polymer and shape memory alloy reinforcement

2019 ◽  
Vol 30 (10) ◽  
pp. 1585-1593 ◽  
Author(s):  
Ali Saeedi ◽  
Mahmood M Shokrieh
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Composite Structures ◽  
Fracture Behavior ◽  
Micromechanical Model ◽  
Self Healing ◽  
Compression Tests ◽  
Healing Efficiency ◽  
Shape Memory Effects ◽  
Good Agreement

A novel self-healing polymer composite made of the thermally reversible polymer matrix and shape memory alloy reinforcement is introduced. The healing system is designed in such a way that by heating the structure, activation of shape recovery in shape memory alloy and chemical reversible reactions in polymer occur simultaneously. In the present healing method, the required crack closure force is provided by activating the embedded shape memory alloy wires in the polymer. Both superelastic and shape memory effects of shape memory alloy are considered on the fracture behavior of composites by investigating the passive and active reinforcement methods, respectively. Double cleavage drilled compression tests are utilized in order to study the fracture behavior and healing efficiency of composites. In the case of passive reinforcement, embedding 2% prestrained shape memory alloy wires caused 15% enhancement in the fracture toughness of composites. In this prestrain level, results of the micromechanical model are in good agreement with experiments. Promising results are also obtained for healing efficiency of composites in the case of active reinforcement. The average healing efficiency of 92% is achieved for shape memory alloy-reinforced thermally reversible epoxy composites. The excellent healing performance, without the necessity of external force and pressure, makes the present healing method as an ideal candidate for utilizing self-healing composite structures.

Effects of Shape Geometry on the Efficiency of Self-Healing Polymers

2012 ◽  
Author(s):  
Ifeanyi J. Okoro ◽  
Yves Q. Yougoubare ◽  
Su-Seng Pang
Keyword(s):  
Aspect Ratio ◽  
Crack Propagation ◽  
Physical Properties ◽  
Shape Memory ◽  
Composite Structures ◽  
Direct Relationship ◽  
Shape Memory Polymers ◽  
Self Healing ◽  
Aspect Ratios ◽  
The Relationship

Autonomic smart self-healing composites are being developed and tested to deal with the problems of crack propagation and eventual damage. The recovery and self-healing efficiencies of these composite structures varies with changes in different physical properties such as temperature and shape geometry. The foremost steps in creating a self-healing composite are mixing and programming and recovery. This paper explores the relationship between a composite’s programming processes against its shape-geometry. Improving the programming and recovery would lead to an improved self-healing polymer. To this end, samples of self-healing shape-memory polymers of different aspect ratios are tested after programming and recovery, and their compressive strengths are compared. The results show a direct relationship between the compressive strengths and aspect ratio.

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