In this work, the contact force model and experiment methods were used to study the dynamic response and impact wear behavior of TP316H steel. The Flore model and the classic Hertz model were selected for comparison with the experimental results, and the model was revised according to the section parameters of the TP316H tube. The results show that there is a large difference between the models without considering the effect of structural stiffness on the impact system and the test results, whereas the revised model has a good agreement. With the rise in impact mass, the coefficient of restitution increases from 0.65 to 0.78, whereas the energy dissipation and wear volume decrease. Spalling, delamination, plastic deformation, and oxidative wear are the main impact wear mechanism of TP316H steel.
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http://dx.doi.org/10.3390/ma15082881 | DOI Listing |
Asia Pac J Ophthalmol (Phila)
January 2025
School of Optometry and Vision Science, University of New South Wales, Sydney, Australia.
Purpose: To determine the role of topical caffeine in slowing progression of myopia, both as a standalone treatment and in combination with atropine.
Methods: In a prospective, randomized, dispensing clinical trial, 96 children with myopia, aged 6-13 years, spherical equivalent (SE) from -0.50 diopters (D) to -6.
Mar Pollut Bull
January 2025
Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, PR China; Dalian Key Laboratory of Internal Combustion Engine Tribology and Reliability Engineering, Dalian 116026, PR China. Electronic address:
As a global challenge, marine biofouling is causing serious economic losses and adverse ecological impacts. In recent years, a variety of promising and environmentally friendly anti-fouling strategies have emerged, among which the excellent anti-fouling performance of bionic autocrine coatings has been recognized. However, bionic autocrine coatings still suffer from uncontrollable secretion behavior, poor mechanical stability, and poor abrasion resistance.
View Article and Find Full Text PDFJ Biomech
January 2025
Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong Special Administrative Region.
This study explored how systematic changes in running shoe degradation and foot inversion alter the distribution and peak value of heel pressure and calcaneus stress, as well as the total stress-concentration exposure (TSCE) within the calcaneal bone. A foot-shoe finite element model was employed and three shoe wear conditions (new shoe (CON), moderate worn shoe (MWSC), excessive worn shoe (EWSC)) coupled with three foot inversion angles (0°, 10°, 20°) were further modulated. Simulations were conducted at the impact peak instant during running.
View Article and Find Full Text PDFIntroduction: With the introduction of increasingly powerful audio equipment and increase of personal mobile audio devices in the 21st century, the prevalence of noise-induced hearing loss (NIHL) in young adults is expected to increase. This increase, estimated to impact 30 million adults in the next four decades, is due in part to recreational exposure. While many young adults have a general understanding of NIHL, a detailed education on various topics of NIHL could further promote adherence to the use of preventive measures.
View Article and Find Full Text PDFEnviron Sci Pollut Res Int
January 2025
CERENA - Civil Engineering Research and Innovation for Sustainability, IST-ID, Av. António José de Almeida 12, 1049-001, Lisbon, Portugal.
Polypropylene (PP) disposable face masks (DFMs) are essential for limiting airborne infectious diseases. This study examines the behavior of DFMs under three scenarios: (i) exposure to the natural environment, (ii) simulated high-energy aquatic environments through an abrasion test, and (iii) incorporation into cement-based mortars. In the natural weathering experiment, after 117 days, the DFMs exhibited photodegradation, resulting in chemical alterations in carbonyl and hydroxyl groups.
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