scholarly journals Improvement of fatigue resistance of epoxy composite with microencapsulated epoxy-SbF5 self-healing system

2017 ◽  
Vol 11 (11) ◽  
pp. 853-862 ◽  
Author(s):  
X. J. Ye ◽  
Y. Zhu ◽  
Y. C. Yuan ◽  
Y. X. Song ◽  
G. C. Yang ◽  
...  
Keyword(s):  
Fatigue Resistance ◽  
Epoxy Composite ◽  
Self Healing ◽  
Healing System

scholarly journals Improvement of Fatigue Resistance of Epoxy Composite with Heterogeneous Solid-State Self-Healing System

2020 ◽  
Vol 49 (09) ◽  
pp. 2197-2210
Author(s):  
Mohd Suzeren Md Jamil ◽  
Wan Naqiuddin Wan Zulrushdi ◽  
Noor Nabilah Muhamad
Keyword(s):  
Solid State ◽  
Fatigue Resistance ◽  
Epoxy Composite ◽  
Self Healing ◽  
Healing System ◽  
Heterogeneous Solid

Mechanical behavior and self-healing mechanism of polyurea-based double-walled microcapsule/epoxy composite films

2021 ◽  
Vol 157 ◽  
pp. 106283
Author(s):  
Yanxuan Ma ◽  
Jiatong Liu ◽  
Yingrui Zhang ◽  
Yajie Ge ◽  
Rui Wu ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Epoxy Composite ◽  
Composite Films ◽  
Self Healing

scholarly journals Effect of mesoscale phase contrast on fatigue-delaying behavior of self-healing hydrogels

2021 ◽  
Vol 7 (16) ◽  
pp. eabe8210
Author(s):  
Xueyu Li ◽  
Kunpeng Cui ◽  
Takayuki Kurokawa ◽  
Ya Nan Ye ◽  
Tao Lin Sun ◽  
...  
Keyword(s):  
Crack Growth ◽  
Fatigue Resistance ◽  
Phase Contrast ◽  
Stress Singularity ◽  
Soft Materials ◽  
Self Healing ◽  
Strong Phase ◽  
Mesoscale Structure ◽  
High Fatigue ◽  
Affine Deformation

We investigate the fatigue resistance of chemically cross-linked polyampholyte hydrogels with a hierarchical structure due to phase separation and find that the details of the structure, as characterized by SAXS, control the mechanisms of crack propagation. When gels exhibit a strong phase contrast and a low cross-linking level, the stress singularity around the crack tip is gradually eliminated with increasing fatigue cycles and this suppresses crack growth, beneficial for high fatigue resistance. On the contrary, the stress concentration persists in weakly phase-separated gels, resulting in low fatigue resistance. A material parameter, λtran, is identified, correlated to the onset of non-affine deformation of the mesophase structure in a hydrogel without crack, which governs the slow-to-fast transition in fatigue crack growth. The detailed role played by the mesoscale structure on fatigue resistance provides design principles for developing self-healing, tough, and fatigue-resistant soft materials.

scholarly journals Influencing Factors on the Healing Performance of Microcapsule Self-Healing Concrete

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4139
Author(s):  
Yanju Wang ◽  
Zhiyang Lin ◽  
Can Tang ◽  
Wenfeng Hao
Keyword(s):  
Compressive Strength ◽  
Sodium Silicate ◽  
Recovery Rate ◽  
Sound Speed ◽  
Orthogonal Experimental Design ◽  
Self Healing ◽  
Damage Degree ◽  
Strength Recovery ◽  
Healing System ◽  
Recovery Performance

The amounts of the components in a microcapsule self-healing system significantly impact the basic performance and self-healing performance of concrete. In this paper, an orthogonal experimental design is used to investigate the healing performance of microcapsule self-healing concrete under different pre-damage loads. The strength recovery performance and sound speed recovery performance under extensive damage are analyzed. The optimum factor combination of the microcapsule self-healing concrete is obtained. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) are carried out on the concrete samples before and after healing to determine the healing mechanism. The results show that the healing effect of self-healing concrete decreases with an increase in the pre-damage load, and the sound speed recovery rate increases with an increase in the damage degree. The influence of the sodium silicate content on the compressive strength and compressive strength recovery rate of the self-healing concrete increases, followed by a decrease. The optimum combination of factors of the microcapsule self-healing system is 3% microcapsules, 30% sodium silicate, and 15% sodium fluosilicate. The results can be used for the design and preparation of self-healing concrete.

Development of a multifunctional nanocomposite film with record-high ultralow temperature toughness and unprecedented fatigue-resistance

2021 ◽  
Author(s):  
Shuaicheng Jiang ◽  
Yanqiang Wei ◽  
Jiongjiong Li ◽  
Xiaona Li ◽  
Kaili Wang ◽  
...  
Keyword(s):  
Fatigue Resistance ◽  
Spider Silk ◽  
Soybean Protein ◽  
Scale Up ◽  
Poly Vinyl Alcohol ◽  
Polar Regions ◽  
Self Healing ◽  
Fluorescent Properties ◽  
Soybean Protein Isolate ◽  
Ultralow Temperature

Abstract In the quest of materials that can tolerate extreme environments (i.e., aerospace, polar regions of earth), facile design of self-healing, high fatigue-resistant and multifunctional nanocomposite materials with excellent ultralow temperature toughness, especially by utilizing inexpensive and sustainable bioresources is still currently challengeable. In current study, we present a material that displays remarkable ultralow temperature toughness, shows excellent toughness (107.3 MJ·m-3) at − 196°C and maintains high mechanical strength in highly humid environments. This material is a spider silk-inspired, poly(vinyl alcohol) (PVA)-based, autonomous room temperature self-healable nanocomposite by complexation of boron nitride (BN), quantum dots (QDs) and soybean protein isolate grafted lignin (SPI-lignin). The fabricated material, namely PVA-BN-QDs-SPI-lignin, simultaneously exhibits outstanding tensile strength (53.3 MPa), toughness (182.8 MJ·m-3), fatigue-resistance as well as antiultraviolet and fluorescent properties and sets an impressive new record of folding-failure (900 000 times) and toughness, which are 10.6 to 45.7 times higher than other graphene-based nanocomposites. It can be impressively self-healed within only 2 minutes. Of particular interest is its facile, green, mild and inexpensive preparation method that can be easily scale up. It is believed that this work, beginning with abundant biodegradable resources, opens the door to develop biobased multifunctional materials in practical applications, such as flexible wearable materials.

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