Prediction of residual stress and deformation of enameled steel

Son, Young-Ki; Lee, Kyung-Hun; Yang, Kyung-Soek; Ko, Dae-Cheol; Kim, Byung-Min

doi:10.1007/s12541-015-0216-9

Cited by 10 publications

(7 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To determine the stress and deformation state of composite film, we designed a much smaller model with a 2.5‐µm‐thick glass layer coated on a 500 × 500 µm Kapton membrane and assumed that the thermal stress would be eliminated above T d . [ 39 ] The obtained maximum deformation and stress with temperature is shown in Figure 4i. After completion of the firing process, some residual stress remains.…”

Section: Figurementioning

confidence: 99%

“…Glass and polymer materials have different deformation behaviors; therefore, stresses will exist in the composite film. [38,39] Thermomechanical analysis (TMA) was used to analyze the dimensional changes of the Kapton membrane with temperature under 0.01 and 0.05 N forces (Figure 2c). There is shrinkage in the high-temperature region under the smaller tensile force, but shrinkage does not occur under the high-force conditions.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Transparent Flexible Ultra‐Low Permeability Encapsulation Film: Fusible Glass Fired on Heat‐Resistant Polyimide Membrane

Zhu

Babu

et al. 2020

Adv Materials Inter

View full text Add to dashboard Cite

physics, and engineering. One of the key points lies in the development of flexible substrate materials and efficient packaging technology. The components of organic light-emitting devices (OLEDs) or organic photovoltaics (OPV), including the cathode materials and photoelectric conversion layer, are reactive; thus, thin films should encapsulate both the top and bottom surfaces of the devices to realize the desired property. [2-4] Barrier-coated plastic lids, ultrathin glasses, and vacuumdeposited thin films have been developed as thin-film encapsulation (TFE) approaches. [5] However, there are many issues with the current manufacturing methods for encapsulation films. The laser lift-off (LLO) process is widely used for flexible electronics manufacturing, requires evaporating each functional layer onto a substrate, then peeling the devices off the substrate using a laser; the product yield is high, but the productivity is low. In contrast, roll-to-roll (R2R) processing, which involves directly assembling the devices on a formed substrate, is more suitable for large-scale industrial production. [6,7] There are demanding performance requirements for the encapsulation film, such as light transmittance, flexibility, gas impermeability, and heat resistance. The encapsulation film in the direction of light transmission should be highly transparent. [8,9] The other functional layers in electronic devices can be fabricated with nanoscale thickness; thus, the flexibility of the completed devices mainly depends on the properties of the encapsulation materials. Encapsulation materials have gradually developed from rigid glass plates to flexible thin films in recent years. [6,10] The degree of gas permeability is the most important property of TFE materials because flexible electronics use reactive metals and organic matters in devices. It is generally required that the water vapor transmission rate (WVTR) and oxygen transmission rate (OTR) should be on the order of 10 −3-10 −6 g m −2 day −1 to provide flexible electronics to have a sufficient service life. [11,12] Furthermore, OLEDs, for example, use thin-film transistors (TFTs) to control brightness and grayscale. A flat/smooth surface (roughness average R a < 1 nm) is beneficial for the fabrication of its nanostructures, and as the manufacturing temperature of TFTs is very high, A good packing of flexible electronics is one of the most critical points to ensure its lifetime. However, efficient and straightforward packaging technology is still very challenging. In this work, a new strategy for preparing encapsulation film is reported by "enameling" a fusible glass layer on a polymer membrane. Careful consideration has been given to the materials properties and manufacturing process, and the obtained glass-coated polymer can combine the advantageous properties of polymers and inorganic materials unconventionally. The encapsulation films show exceptional overall properties, including transparency (<5% optical deterioration), flexibility (radius of curvature: 1.5 mm), and low ...

show abstract

Section: Figurementioning

confidence: 99%

mentioning

confidence: 99%

Transparent Flexible Ultra‐Low Permeability Encapsulation Film: Fusible Glass Fired on Heat‐Resistant Polyimide Membrane

Zhu

Babu

et al. 2020

Adv Materials Inter

View full text Add to dashboard Cite

show abstract

“…Such residual stresses affect cracking and spallation of the coating, inducing shape changes that could modify the overall performance of the structure (Ambu et al, 2014). In order to study the residual stress distribution, finite element analysis (FEA) of enamel steel structures has been used (Son et al, 2012(Son et al, , 2014(Son et al, , 2015. In particular Ambu et al developed a micrographybased finite element model (FEM) to quantify the residual stress distribution on VES sheets, revealing how bubbles have a great influence on residual stress distribution and -2 -on the mechanical strength of the coating (Ambu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…1 In order to study the residual stress distribution, finite element analysis (FEA) of enamel steel structures has been used. [11][12][13] In particular Ambu et al developed a micrography-based finite element model (FEM) to quantify the residual stress distribution on VES sheets, revealing how bubbles have a great influence on residual stress distribution and on the mechanical strength of the coating. 1 However, the use of 2D imaging techniques could not reliably be used to understand the bubble spatial distribution in the VES volume, and their influence on the enamel coating performance.…”

Section: Introductionmentioning

confidence: 99%

High‐resolution X‐ray tomographic workflow to investigate the stress distribution in vitreous enamel steels

Sensini

Pisaneschi

Cocchi

et al. 2021

Journal of Microscopy

View full text Add to dashboard Cite

Vitreous enamel steels (VES) are a class of metal-ceramic composite materials realized with a low carbon steel basement coated by an enamel layer. During the firing phase to adhere the enamel to the metal, several gas bubbles remain entrapped inside the enamel volume modifying its internal structure. In this work high-resolution X-ray computed tomography (micro-CT) was used to investigate these composite materials.The micro-CT reconstructions enabled a detailed investigation of VES minimizing the metal artifacts. The tomograms were used to develop finite element models (FEM) of VES by means of a representative volume element (RVE) to evaluate the thermal residual stresses caused by the manufacturing process, as well as the effect of the 3D bubbles distribution on the internal stress patterns after the thermic gradient. The promising results from this study have the potential to inform further research on such composite materials by optimizing manufacturing processes for targeted applications.

show abstract

“…Residual stress greatly influences the fatigue strength, stress corrosion, and shape accuracy of the parts. In recent years, many scholars have used different principles and methods to conduct studies pertaining to residual stress, including the measurement and calculation of residual stress, analyses of residual stresses in key parts during service, and analyses of residual stresses in new materials and new technology [2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Residual Stress and Bending Strength of Gear Tooth Surface after Shot Peening Treatment

Liang

Meng

Chen

et al. 2020

Shock and Vibration

View full text Add to dashboard Cite

The fatigue strength of a gear tooth surface is affected by various factors, which subsequently impacts the transmission performance of gears. Usually, shot peening treatment is carried out during processing to improve the performance of gears. Most current studies focus on theoretical descriptions and simulation analyses of shot peening treatment. However, in this paper, the relationships among shot peening treatment, residual stress, and bending fatigue strength of a gear tooth surface are discussed, through experimental methods. Based on X-ray stress analysis, at select locations on the test samples, the residual stresses on gear tooth surfaces with and without shot peening treatment are determined and contrasted. The results show that shot peening treatment can effectively increase the residual stress on gear tooth surfaces. In addition, an electromagnetic resonance fatigue tester is used to analyze the bending fatigue strength of gear tooth surfaces. The test results indicate that the bending fatigue strength of the gear teeth with shot peening is higher than that of the gear teeth without shot peening. The obtained conclusions lay the foundation for further practical engineering applications of gears.

show abstract

Prediction of residual stress and deformation of enameled steel

Cited by 10 publications

References 12 publications

Transparent Flexible Ultra‐Low Permeability Encapsulation Film: Fusible Glass Fired on Heat‐Resistant Polyimide Membrane

Transparent Flexible Ultra‐Low Permeability Encapsulation Film: Fusible Glass Fired on Heat‐Resistant Polyimide Membrane

High‐resolution X‐ray tomographic workflow to investigate the stress distribution in vitreous enamel steels

Experimental Analysis of Residual Stress and Bending Strength of Gear Tooth Surface after Shot Peening Treatment

Contact Info

Product

Resources

About