Multi-attribute parametric optimisation of shape memory polymer properties for adaptive orthopaedic plasters

Jeewantha, L. H. Janitha; Emmanuel, K.D.C.; Herath, Madhubhashitha; Islam, Mainul; Fang, Liang; Epaarachchi, Jayantha

doi:10.1016/j.mtla.2022.101325

Cited by 9 publications

(10 citation statements)

References 34 publications

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“…Assessment value is the ratio of pre-assessment value (P ij ) to the summation of O ij and P ij as shown in equation ( 11) [60]. e parametric combination with highest assessment value as represented in Table 8 was chosen as the optimal as portrayed in equation ( 12) [61].…”

Section: Relative Index Methodmentioning

confidence: 99%

Electric Discharge Machining of AZ91 Magnesium Hybrid Composites under Different Dielectric Mediums

Prakash¹,

Ranjith²,

Mohan

et al. 2022

Advances in Materials Science and Engineering

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In this work, an attempt was made to machine the AZ91/5B4C/5Gr hybrid composites in a castor oil electric discharge medium with an objective of attaining green environment. The hybrid composites were produced using stir casting technique in a protective environment. Experiments were conducted by varying dielectric fluid (castor oil and hydrocarbon oil), tool materials (copper, graphite, and brass), polarity, current, pulse-on time, and gap distance in Al2O3 mixed dielectric medium. L36 Taguchi approach was adopted for the design of experiments, and machining performance was accessed in terms of material removal rate (MRR), tool wear rate (TWR), and surface roughness (Ra). Because of castor oil’s high thermal conductivity, high kinematic viscosity, and lower dielectric strength, the specimen exhibits 5% higher MRR than EDM oil. When the electrodes were connected to the negative polarity, the Ra was 1.72 μm and 3.66 μm at positive polarity; however, at negative polarity, the TWR was higher than the MRR. The high density and specific heat of castor oil facilitate flushing and uniform heat distribution; as a result, the composite had a Ra of 2.52 μm compared to 2.86 μm when machined with conventional EDM oil. Surface topography showed the specimen machined with hydrocarbon dielectric medium proffers black spots, which were eliminated in castor dielectric medium. Best parametric combination was selected by the Relative Index Method optimization technique.

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Section: Relative Index Methodmentioning

confidence: 99%

Electric Discharge Machining of AZ91 Magnesium Hybrid Composites under Different Dielectric Mediums

Prakash¹,

Ranjith²,

Mohan

et al. 2022

Advances in Materials Science and Engineering

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“…The Synthesized SP thus demonstrated a promising strategy for addressing the current orthopedic fractured bone limb immobilization issues. 95,96 Urgent management of orthopedic treatment is frequently needed in hospitals due to slip-and-fall injuries and auto accidents.…”

Section: Surgical Suturesmentioning

confidence: 99%

Smart shape memory polymers and their significance in biomedical applications: A review

Singhwane

Jaiswal

Chaturvedi

et al. 2023

Polymers for Advanced Techs

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Shape‐memory polymers (SMP) are materials responsive to stimuli, which will be modified to their initial form on the occurrence of an appropriate input. SMPs have been a class of impulsively valuable material in the last few decades. Because of their numerous, adaptable uses across a wide range, “wise” materials (SMPs) have attracted intense interest in the advanced material fields. Besides others, they need a substantial part of the area of the medical field. SMPs provide flexibility for promoting keyhole surgery, which offers stable strength, imposes stabilization forces, rinse therapeutic agents, and are degradable. Basic research on proposed SMP systems for medicine emphasizes biocompatibility, tolerability, disinfection, and non‐toxicity. This article mentions an overview of the latest advancements in the applications of SMP been reported. The article aims to incorporate all the possible applications of SMP, making it a versatile material that juxtaposes it with other advanced materials. The significance of SMP in the biomedical field, drug development, cardio‐vascular diseases, tissue engineering, wound dressing, surgical sutures, and many other applications has been highlighted. Another section dedicated to the antimicrobial abilities of SMP has been discussed. The last section is devoted to the conclusion and future developments in the respective area. Thus, this review focuses on many biomedicine areas and tube, medical science, and neuronic applications regarding the development and ability of SMPs to boost the quality of services in these fields.

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“…To date, bisphenol A based SMPCs are extensively studied for aerospace applications 34 structural engineering applications 9 and biomedical applications. 35 In this study, the SMP matrix material was synthesized by using bisphenol A epoxy resin and tetramine and jeffamine hardeners. Huntsman Australia supplied the bisphenol A epoxy resin and tetramine hardener (Aradur HY 951).…”

Section: Preparation Of the Dofs Embedded Smpcmentioning

confidence: 99%

Distributed sensing based real‐time process monitoring of shape memory polymer components

Herath

Emmanuel

Jeewantha

et al. 2022

J of Applied Polymer Sci

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Shape memory polymer (SMP) materials have the capacity to undergo large deformations imposed by mechanical loading, hold a temporary shape, and then recover their original shape upon exposure to a particular external stimulus. The fiber reinforced shape memory polymer composites (SMPCs) with enhanced structural performances give a boost to breakthrough technologies for large-scale engineering applications. This article presents a novel technique for distributed optical fiber sensor (DOFS) embedded SMPCs intended for realtime process monitoring of large-scale engineering applications such as deployable space structures. Herein a carbon fiber reinforced SMPC was tested under a three-point flexural shape memory process and the DOFS data were acquired through optical backscatter reflectometry. Experiments were conducted in a temperature controlled thermal chamber coupled with a 10 kN electromechanical testing system. DOFSs offered unique advantages for spatially distributed dynamic temperature and strain measurements during the shape memory process. Compared to the standard test method dynamic mechanical analysis, larger samples can be tested effectively by using a single DOFS with large strain levels and shape complexity. The proposed technique demonstrated the ability of embedded DOFSs for in-situ shape memory characterization such as shape fixity ratio, shape recovery ratio and recovery rate. This technique will eliminate the challenges hindering the process monitoring and performance evaluation of large SMPC components operating in their real working environments.

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Multi-attribute parametric optimisation of shape memory polymer properties for adaptive orthopaedic plasters

Cited by 9 publications

References 34 publications

Electric Discharge Machining of AZ91 Magnesium Hybrid Composites under Different Dielectric Mediums

Electric Discharge Machining of AZ91 Magnesium Hybrid Composites under Different Dielectric Mediums

Smart shape memory polymers and their significance in biomedical applications: A review

Distributed sensing based real‐time process monitoring of shape memory polymer components

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