A thermo-mechanical model for simulating the temperature and stress distribution during laser cladding process

Zhang, Zhe; Kovacevic, Radovan

doi:10.1007/s00170-018-3127-y

Cited by 46 publications

(22 citation statements)

References 31 publications

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“…The antibacterial activity of these hydrogels against E. coli and S. aureus were estimated by the bacterial inhibition zones. After a night of incubation, the agar plates showed significant inhibition zones around the Ag‐incorporated hydrogel, and relatively small inhibition zones appeared in PEGDA/TCS/POSSP hydrogel resulting from the presence of inherent antibacterial ingredients (CS derivatives and polydopamine), which to some extent could inhibit the growth of bacteria, [ 36,37 ] whereas the other two group without nAg presented no inhibition to the growth of the bacteria ( Figure A). The inhibition zone diameter of E. coli and S. aureus was 3.61 ± 0.33 mm and 3.56 ± 0.25 mm, respectively for incorporated‐Ag samples (Figure 5B), respectively, indicating that the strong antibacterial properties of the PEGDA/TCS/POSSP@Ag hydrogel could be mainly attributed to the antimicrobial ability of the broad‐spectrum of Ag.…”

Section: Resultsmentioning

confidence: 99%

A Novel Dual‐Crosslinked Functional Hydrogel Activated by POSS for Accelerating Wound Healing

Yang

Huang

Fan

et al. 2021

Adv Materials Technologies

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Hydrogel dressings have attracted extensive attention owing to the similarity in their softness to that of the extracellular matrix, adjustability of physicochemical properties, and ability to remain moist even at the wound site. However, developing composite hydrogel with excellent mechanical behavior, adhesiveness to tissues, good biocompatibility, long‐term antibacterial properties, and enhanced vascularization capacity continues to be a great challenge. Herein, a novel nanocomposite hydrogel based on the photo‐cross‐linking of poly(ethylene glycol)diacrylate (PEGDA), thiolated chitosan (TCS), and modified polyhedral oligomeric silsesquioxane (POSS) nanoparticles is designed. Moreover, silver ions (Ag+) are loaded into the system via dynamic coordination of Ag–S. The resultant PEGDA/TCS/POSSP@Ag hydrogel presents high toughness, strength, and good tissue adhesiveness and facilitates the attachment and proliferation of human umbilical vein endothelial cells (HUVCEs) in vitro. As a controlled release carrier of the bacteria‐killing activity of Ag+, the composite system achieves controlled release of Ag+ and good antibacterial activity. Further in vivo experiments demonstrated that the PEGDA/TCS/POSSP@Ag scaffolds significantly promote skin regeneration by reducing inflammation and inhibiting infection, a rat model with full‐thickness skin defects verified its ability to stimulate microvascular formation due to activation of POSS. Thus, the multi‐functional nanocomposite hydrogel is a highly promising dressing material for wound healing.

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Section: Resultsmentioning

confidence: 99%

A Novel Dual‐Crosslinked Functional Hydrogel Activated by POSS for Accelerating Wound Healing

Yang

Huang

Fan

et al. 2021

Adv Materials Technologies

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“…The model is relatively complicated and must incorporate material nonlinearities, complex geometry, and the theory of large deformations (based mostly on Green-Lagrange strain equations). More particulars can be found in references [28,29].…”

Section: Field Of Mechanical Stressesmentioning

confidence: 99%

Modelling the Laser Cladding of Geometrically More Complex Tracks and Its Experimental Verification

Doležel

Kotlan

Hamar

et al. 2021

Metals

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In this paper, a methodology for depositing wear- and corrosion-resistant layers of geometrically more complex tracks on metal substrates is presented. The corresponding mathematical model includes the temperature field produced by the laser beam, the field of residual mechanical stresses, and the efficiency of utilization of the delivered powder material. The computations are realized using the finite element method, with a substantial improvement in processing the time-variable geometry of the investigated system being found, based on the introduction of two specific matrices that characterize both the surface on which the tracks are cladded as well as the track itself. The proposed technique is illustrated by cladding an angled helix on a metal surface. Selected results are successfully verified by experiments.

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“…The main models used to describe laser heat source include Rosonthal analytical model, Gauss distribution heat source model, uniform heat source model, semispherical heat source model, ellipsoidal model and double-ellipsoid heat source model [37][38][39][40][41][42][43][44][45][46][47][48][49][50], etc. As for laser cladding, diffractive optical element is usually used to transform Gauss beam into rectangular beam with uniform energy density distribution [51], so the uniform heat source model is usually applied in numerical simulation.…”

Section: Thermal-mechanical Coupling Finite Element Modelingmentioning

confidence: 99%

Numerical Simulation of Convex Shape Beam Spot on Stress Field of Plasma-sprayed MCrAlY Coating During Laser Cladding Process

Zhang

Chu

et al. 2021

Preprint

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In order to reduce the thermal stress at clad layer and further reduce the crack generation in the laser cladding process, a method of controlling the cracks at clad layer by changing the laser energy density was proposed. The comparative thermal-mechanical coupling finite element analysis was conducted for the uniform rectangular spot and convex shape beam spot cladding processes on plasma-sprayed MCrAlY coating through the numerical simulation method based on the ANSYS software. The results show that the rapid heating and cooling characteristics, which are typical in laser processing, are manifested in the cladding process using the uniform rectangular spot, and the convex shape spot can exert the preheating and slow cooling effects to a certain extent, so as to reduce the temperature gradient of the cladding zone and non-cladding zone. In addition, on the precondition of equivalent cladding effect, the thermal stress at the clad layer is also low, so the cracking tendency of the clad layer can be effectively mitigated. Relative to the laser beam shaped diffractive optical element special for design and manufacturing, superposing two uniform rectangular spots with different sizes and energy densities is a simpler and more effective method of acquiring the convex shape spot.

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A thermo-mechanical model for simulating the temperature and stress distribution during laser cladding process

Cited by 46 publications

References 31 publications

A Novel Dual‐Crosslinked Functional Hydrogel Activated by POSS for Accelerating Wound Healing

A Novel Dual‐Crosslinked Functional Hydrogel Activated by POSS for Accelerating Wound Healing

Modelling the Laser Cladding of Geometrically More Complex Tracks and Its Experimental Verification

Numerical Simulation of Convex Shape Beam Spot on Stress Field of Plasma-sprayed MCrAlY Coating During Laser Cladding Process

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A thermo-mechanical model for simulating the temperature and stress distribution during laser cladding process

Cited by 46 publications

References 31 publications

A Novel Dual‐Crosslinked Functional Hydrogel Activated by POSS for Accelerating Wound Healing

A Novel Dual‐Crosslinked Functional Hydrogel Activated by POSS for Accelerating Wound Healing

Modelling the Laser Cladding of Geometrically More Complex Tracks and Its Experimental Verification

Numerical Simulation of Convex Shape Beam Spot on Stress Field of Plasma-sprayed MCrAlY&nbsp;Coating During Laser Cladding Process

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Numerical Simulation of Convex Shape Beam Spot on Stress Field of Plasma-sprayed MCrAlY Coating During Laser Cladding Process