Use of the term Defect

Becker, William T.; Shipley, Roch J.; Aliya, D.

doi:10.1361/15477020522915

Cited by 9 publications

(4 citation statements)

References 1 publication

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“…The fracture surface of the printed polymer demonstrates brittle features that can be seen in the SEM images. These fracture features are similar for all four time points which demonstrate mirror, mist, and hackle transitions typical of a brittle fracture mode. − The crack initiation site (highlighted by the black arrow) is angled, and it starts at one corner of the fracture surface; it is followed by small mirror and mist regions (indicated by white arrows). The hackle region, which follows the mist region, takes up most of the fracture surfaces on all four specimens.…”

Section: Resultsmentioning

confidence: 83%

“…The SEM imaging from the tensile test samples provides sufficient evidence of classic brittle fracture features for the printed polymers, which supports the mechanical test data. The formation of mirror, mist, and hackle patterns on the fracture surface of the polymer indicate a brittle failure . Overall, the fracture surface morphology did not differ over time.…”

Section: Discussionmentioning

confidence: 89%

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Materials Characterization of Stereolithography 3D Printed Polymer to Develop a Self-Driven Microfluidic Device for Bioanalytical Applications

Stark,

Gamboa,

Esparza

et al. 2024

ACS Appl. Bio Mater.

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Stereolithography (SLA) 3D printing is a rapid prototyping technique and reproducible manufacturing platform, which makes it a useful tool to develop advanced microfluidic devices for bioanalytical applications. However, limited information exists regarding the physical, chemical, and biological properties of the photocured polymers printed with SLA. This study demonstrates the characterization of a commercially available SLA 3D printed polymer to evaluate the potential presence of any time-dependent changes in material properties that may affect its ability to produce functional, capillary-action microfluidic devices. The printed polymer was analyzed with Fourier transform infrared–attenuated total reflectance, contact angle measurements, tensile test, impact test, scanning electron microscopy, and fluid flow analysis. Polymer biocompatibility was assessed with propidium iodide flow cytometry and an MTT assay for cell viability. The material characterization and biocompatibility results were then implemented to design and fabricate a self-driven capillary action microfluidic device for future use as a bioanalytical assay. This study demonstrates temporally stable mechanical properties and biocompatibility of the SLA polymer. However, surface characterization through contact angle measurements shows the polymer’s wettability changes over time which indicates there is a limited postprinting period when the polymer can be used for capillary-based fluid flow. Overall, this study demonstrates the feasibility of implementing SLA as a high-throughput manufacturing method for capillary action microfluidic devices.

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Section: Resultsmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 89%

Materials Characterization of Stereolithography 3D Printed Polymer to Develop a Self-Driven Microfluidic Device for Bioanalytical Applications

Stark,

Gamboa,

Esparza

et al. 2024

ACS Appl. Bio Mater.

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“…This is a common feature in ductile fracture. Shear bands, regions where the material has undergone significant shear deformation, may be more evident at elevated temperature [21]. These bands can be indicative of localized plastic flow.…”

Section: Effect Of Deformation Temperature On Fractures Surfacementioning

confidence: 99%

Experimental study on effect of deformation temperature on mechanical and biological activities of Ti-6Al-7Nb titanium alloy

Munisamy,

Rajendran

2024

Phys. Scr.

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Titanium alloy plays a crucial role in biomedical applications, particularly in the field of medical implants. One of the most significant advantages of Titanium alloy is its excellent biocompatibility. Eventhough, it offered excellent behaviour, at elevated temperature, titanium alloys may experience softening, which limits their application in environments with higher operating temperatures. In this investigation, hot tensile and biological behaviour of the Ti-6Al-7Nb under different operating temperatures (300oC, 400oC, 500oC and 600oC) is studied. The biological behaviour of the deformed Ti-6Al-7Nb titanium alloy treated with simulated body fluid is studied. The microstructure and phase transformation of deformed titanium alloy is evaluated using scanning electron microscope (SEM) and X-Ray diffraction (XRD) respectively. It was revealed that at temperature of 600oC, the mobility of molecules at the interface between the solid and liquid phases increases. This enhanced mobility can lead to better wetting of the solid surface by the liquid, resulting in a decrease in the contact angle. Elevated temperature facilitates improved grain development, recrystallization, and mobility. Coarser grains could result from deformation at temperature higher than 600°C. It was concluded that the Ti-6Al-7Nb titanium alloy deformed with 600oC showed the improvement in contact angle of 42±2o and biocompatibility.

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“…It is beyond the scope of this article, but should be noted nevertheless, that even if the alloy composition in a suspect product did not meet specification, further study would be required to show that this deviation caused or even contributed to a failure [1].…”

Section: Introductionmentioning

confidence: 99%

Interpreting the Evidence: Elemental Analysis in the SEM

Shipley

Stevenson

2011

J Fail. Anal. and Preven.

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Failure investigation often involves artifact examination in a scanning electron microscope (SEM). In turn, SEM examination often includes elemental analysis of the surfaces examined, e.g., deposits, a fracture surface, a polished cross section, or other surface. However, elemental data can be misinterpreted without a basic understanding of how they are obtained and the inherent limitations and assumptions of the methods employed. Recent experiences of the authors reinforce the importance of these points.

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Use of the term Defect

Cited by 9 publications

References 1 publication

Materials Characterization of Stereolithography 3D Printed Polymer to Develop a Self-Driven Microfluidic Device for Bioanalytical Applications

Materials Characterization of Stereolithography 3D Printed Polymer to Develop a Self-Driven Microfluidic Device for Bioanalytical Applications

Experimental study on effect of deformation temperature on mechanical and biological activities of Ti-6Al-7Nb titanium alloy

Interpreting the Evidence: Elemental Analysis in the SEM

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