Impact of Post Hardening Mechanism on Self-Healing Assessment of AA2014 Nitinol-Based Smart Composites

2020 ◽  
Author(s):  
Vaibhav Srivastava ◽  
Manish Gupta
Keyword(s):  
Self Healing ◽  
Hardening Mechanism ◽  
Smart Composites ◽  
Healing Assessment

Self‐Healing Smart Composites

2021 ◽  
pp. 345-360
Author(s):  
Sithara Gopinath ◽  
Suresh Mathew ◽  
P. Radhakrishnan Nair
Keyword(s):  
Self Healing ◽  
Smart Composites

scholarly journals Curable Area Substantiation of Self-Healing in Concrete Using Neutral Axis

2019 ◽  
Vol 9 (8) ◽  
pp. 1537 ◽  
Author(s):  
Choonghyun Kang ◽  
Taewan Kim
Keyword(s):  
Neutral Axis ◽  
The Self ◽  
Strain Gauges ◽  
Self Healing ◽  
Distinct Area ◽  
Before And After ◽  
Strength And Stiffness ◽  
Underlying Mechanisms ◽  
Healing Assessment ◽  
Physical Recovery

The self-healing nature of concrete has been proved in many studies using various methods. However, the underlying mechanisms and the distinct area of self-healing have not been identified in detail. This study focuses on the limits of the area of self-healing. A bending specimen with a notch is used herein, and its flexural strength and stiffness before and after healing are compared and used for self-healing assessment. In addition, the neutral axis of the specimen was measured using successive strain gauges attached to the crack propagation part. Although the strength and stiffness of the concrete recovered after self-healing, the change in the location of the neutral axis before and after healing was insignificant, which indicates that physical recovery did not occur for once-opened crack areas.

A self-healing hydrogel with pressure sensitive photoluminescence for remote force measurement and healing assessment

2019 ◽  
Vol 6 (4) ◽  
pp. 703-710 ◽  
Author(s):  
Ming Li ◽  
Weijun Li ◽  
Wei Cai ◽  
Xiaojie Zhang ◽  
Zhihang Wang ◽  
...  
Keyword(s):  
Network Structure ◽  
Force Measurement ◽  
Self Healing ◽  
Pressure Sensitive ◽  
Healing Assessment

A self-healing hydrogel with a triple network structure and pressure sensitive photoluminescence for remote force measurement and healing assessment was successfully fabricated.

scholarly journals A review of techniques for embedding shape memory alloy (SMA) wires in smart woven composites

2018 ◽  
Vol 7 (4.13) ◽  
pp. 129 ◽  
Author(s):  
Danish Mahmood Baitab ◽  
Dayang Laila Abang Haji Abdul Majid ◽  
Ermira Junita Abdullah ◽  
Mohd Faisal Abdul Hamid
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Composite Structures ◽  
Environmental Changes ◽  
Dynamic Environment ◽  
Woven Composites ◽  
Damping Capacity ◽  
Self Healing ◽  
Smart Composite ◽  
Smart Composites

Metallic structures, in various industrial fields such as transport and aerospace, are mostly replaced by composite structures having less weight and good strength. There is also a need of intensification of the operational dynamic environment with high durability requirements. So a smart composite structure is required that can manifest its functions according to environmental changes. One method of producing smart composite structures is to embed shape memory alloys in composite structures. Shape memory alloys (SMAs) have significant mechanical and thermodynamic properties and are available in very small diameters less than 0.2mm. These SMAs are embedded into composites for obtaining smart composites having tunable properties, active abilities, damping capacity and self-healing properties. Shape memory alloys are available in different shapes as wires, sheets, foils, strips, etc. For smart composites, mostly SMA embedded are in wire shape. Different techniques are used for embedding SMA wires in composites. SMA wires can be embedded between layers of laminates of composites, or embedded directly as reinforcement in matrix and can be woven into fabrics and used as a reinforcement. This paper reviews the different techniques of embedding SMA wires in composite structures, their pros and cons and their applications.  

scholarly journals Psychometric Properties of the Self-Healing Assessment Scale for Community-Dwelling Older Adults

Healthcare ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 484
Author(s):  
Yi-Chen Wu ◽  
Hua-I Hsu ◽  
Heng-Hsin Tung ◽  
Shi-Jun Pan ◽  
Shu-Wei Lin
Keyword(s):  
Older Adults ◽  
Convergent Validity ◽  
Reliability And Validity ◽  
Community Dwelling ◽  
The Self ◽  
Assessment Scale ◽  
Self Healing ◽  
Validity Indices ◽  
Healing Assessment ◽  
Community Dwelling Older Adults

Self-healing, an intrinsic healing capacity, helps individuals’ bodies and minds to regain wholeness and is significant in the pursuit of one’s own healthy ageing and independence. This study was intended to develop and preliminarily test the reliability and validity of the self-healing assessment scale (SHAS) for community-dwelling older adults, and was conducted in three phases. Phase 1: The definitions of self-healing were synthesized from our knowledge of the literature regarding the ontology of self-healing and panels of 25 experts. The initial version of the 12-item questionnaire was developed by the in-depth interviews of focus groups and panels, and the content was validated by six experts. Phase 2: A cross-sectional survey, including a total of 500 community-dwelling older adults with a mean age of 71.76, was then conducted for the preliminary reliability and validity test. The content validity indices were satisfied. Twelve items were retained, and three factors were identified, namely, physical and mental state, socioeconomic and environmental status, and independent lifestyle, which explained 65.8% of the variance under explorative approval. Phase 3: the standardized factor above 60 obtained by confirmatory factorial analysis indicated good convergent validity. The relationship between self-healing and health-related quality of life was confirmed via concurrent validity testing. The SHAS can facilitate the evaluation of factors associated with community-dwelling older adults’ self-healing capacity. Programs tailored to enhance self-healing capacity should be designed, implemented, and inspected regarding their effectiveness in older adults.

Antiphase Boundaries in Ordered Ni3FE Crystals

1969 ◽  
Vol 27 ◽  
pp. 62-63
Author(s):  
Y. H. Liu
Keyword(s):  
Domain Size ◽  
Antiphase Domain ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hardening Mechanism ◽  
Superlattice Structure ◽  
Disordered Phase ◽  
Domain Boundaries ◽  
Atomic Scattering ◽  
The Difference

Ordered Ni3Fe crystals possess a LI2 type superlattice similar to the Cu3Au structure. The difference in slip behavior of the superlattice as compared with that of a disordered phase has been well established. Cottrell first postulated that the increase in resistance for slip in the superlattice structure is attributed to the presence of antiphase domain boundaries. Following Cottrell's domain hardening mechanism, numerous workers have proposed other refined models also involving the presence of domain boundaries. Using the anomalous X-ray diffraction technique, Davies and Stoloff have shown that the hardness of the Ni3Fe superlattice varies with the domain size. So far, no direct observation of antiphase domain boundaries in Ni3Fe has been reported. Because the atomic scattering factors of the elements in NijFe are so close, the superlattice reflections are not easily detected. Furthermore, the domain configurations in NioFe are thought to be independent of the crystallographic orientations.

Autonomous self-healing polyisoprene elastomers with high modulus and good toughness based on the synergy of dynamic ionic crosslinks and highly disordered crystals

2020 ◽  
Vol 11 (41) ◽  
pp. 6549-6558
Author(s):  
Yohei Miwa ◽  
Mayu Yamada ◽  
Yu Shinke ◽  
Shoichi Kutsumizu
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Self Healing ◽  
High Modulus ◽  
Disordered Crystals ◽  
Ionic Crosslinks

We designed a novel polyisoprene elastomer with high mechanical properties and autonomous self-healing capability at room temperature facilitated by the coexistence of dynamic ionic crosslinks and crystalline components that slowly reassembled.

Congenital self-healing histiocytosis

1982 ◽  
Vol 118 (4) ◽  
pp. 267-272 ◽  
Author(s):  
E. Bonifazi
Keyword(s):  
Self Healing
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