A fracture strength model applied at room temperature for embedded elliptical crack in brittle solid was obtained. With further research on the effects of various physical mechanisms on material strength, a thermo-damage strength model for ultra-high-temperature ceramics was applied to each temperature phase. Fracture strength of TiC and the changing trends with elliptical crack shape variations under different temperatures were studied. The study showed that under low temperature, the strength is sensitive to the crack shape variation; as the temperature increases, the sensitivities become smaller. The size of ellipse's minor axes has great effect on the material strength when the ratio of ellipse's minor and major axes is lower than 0.5, even under relatively high temperatures. The effect of the minor axes of added particle on material properties thus should be considered under this condition. As the crack area is set, the fracture strength decreases firstly and then increases with the increase of ratio of ellipse's minor and major axes, and the turning point is 0.5. It suggests that for the added particles the ratio of ellipse's minor and major axes should not be 0.5. All conclusions significantly coincided with the results obtained by using the finite element software ABAQUS.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5455490 | PMC |
| http://dx.doi.org/10.3390/ma8085018 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A New Way Forward for Women's Health Research at the National Institutes of Health: A Roadmap From the National Academies of Sciences, Engineering, and Medicine's Consensus Report.
Obstet Gynecol
January 2025
Department of Obstetrics and Gynecology, Spencer Fox Eccles School of Medicine, University of Utah Health, Salt Lake City, Utah; the Department of Obstetrics and Gynecology, Warren Alpert Medical School at Brown University, and Women and Infants Hospital of Rhode Island, Providence, Rhode Island; the National Academies of Sciences, Engineering, and Medicine, and Baker Donelson, Washington, DC; KFF, San Francisco, California; and the Department of Obstetrics and Gynecology, Duke Cancer Institute, Duke School of Medicine, Durham, North Carolina. All authors served on the National Academies Committee as committee members or employees of the National Academies.
Despite efforts to address inequities, research on women's health conditions (defined as those that uniquely or differently affect women and female individuals) remain significantly understudied. As directed by Congress, the National Institutes of Health (NIH) Office of Research on Women's Health requested the National Academies of Sciences, Engineering, and Medicine (National Academies) to conduct an assessment of the state of women's health research at the NIH. The findings of the National Academies committee include: 1) a significant funding inequity, with less than 8% of the total NIH grant budget for fiscal year 2023 allocated to women's health research; 2) a need for improved strategic NIH-wide priority setting, oversight, and adherence to existing policies to support women's health research; 3) a need for a specific institute for research on conditions specific to women's health; and 4) a need for sufficient training and additional funding to grow and retain the women's health research workforce.
View Article and Find Full Text PDFSuperellipse Equation Describing the Geometries of Tree Rings.
Plants (Basel)
December 2024
Co-Innovation Center of Sustainable Forestry in Southern China, College of Forestry and Grassland, Nanjing Forestry University, Nanjing 210037, China.
Our previous study using 41 tree rings of one Mill. disc indicated that the superellipse equation can accurately fit its tree-ring shape. This study further used the superellipse equation (xan+yβn=1 ) to model the geometries of 1090 tree rings of discs collected from five sites in Denmark.
View Article and Find Full Text PDFManufacturing sector spatial pattern evolution and its relationship with regional economic differences: Evidence from Jiangsu, China.
PLoS One
November 2024
Jinling Institute of Technology, School of Architectural Engineering, Nanjing, China.
This study presents the case of China's Jiangsu Province. The spatial-temporal pattern evolution of different manufacturing sectors is discussed using spatial analysis technology (spatial autocorrelation and standard deviation ellipses). The Granger test is used to analyze the relationship between the change in the manufacturing industry spatial agglomeration and regional economic differences.
View Article and Find Full Text PDFA rotational ellipsoid model for solid Earth tide with high precision.
Sci Rep
November 2024
National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing, 210093, China.
Solid Earth tide represents the response of solid Earth to the lunar (solar) gravitational force. The yielding solid Earth due to the force has been thought to be a prolate ellipsoid since the time of Lord Kelvin, yet the ellipsoid's geometry such as major semi-axis's length, minor semi-axis's length, and flattening remains unresolved. Additionally, the tidal displacement of reference point is conventionally resolved through a combination of expanded potential equations and given Earth model.
View Article and Find Full Text PDFArticle Synopsis
- The study examines how the shape and features of the radial head affect the alignment of the proximal radioulnar joint (PRUJ) during forearm rotation, which is vital for elbow function.
- Researchers utilized CT images to create a 3D model of the elbow and analyzed the curvature of the radial head at different positions: maximal pronation, neutral, and maximal supination.
- Results indicated that the PRUJ is more congruent (better aligned) during maximal pronation and supination compared to the neutral position, which had the least congruency.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!