Abstract Proportions of high- and ultra-high strength steels are constantly increasing in modern car bodies. In the press shop there uncertainties concerning application with higher than 1000MPa particularly shear cutting processes. To support steel user regarding a tool material coating wear behavior, long-term test had been carried out. The effects various conditions on damage were investigat...

Chipping caused by micrometric particles poses a threat to the structural integrity of modern dental prosthetic materials. It can degrade their fracture strength and cause wear both artificial crowns antagonist teeth. Here, surface chipping main types commercial ceramic-based materials at microcontact/particle level is investigated means indentation tests. Conical tips different sizes (radii 20...

Abstract This study presents numerical analyses for edge chipping by impact loading. As a analysis method, we extend Particle Discretization Scheme Finite Element Method (PDS-FEM) developed the authors to be able simulate fracture due We performed simulations targeting of soda-lime glass rigid steel sphere and examined crack morphology while varying diameter impactor, velocity, distance. The pr...

The propagation of cracks in layered glass from low-velocity impact of sharp or spherical tip projectiles is observed using high-speed photography. Tests are also carried out to determine the threshold impact energy for chipping in glass blocks and subsurface crack instability in an edge-supported glass plates. The results identify the median and subsurface radial crack systems as the prime dam...

PURPOSE The aim of this pilot study was to assess the clinical performance of esthetic crowns and to compare these to conventional stainless steel crowns (SSC). METHODS Twenty two crowns (11 conventional and 11 esthetic) were placed in mandibular primary molars obeying the following criteria: the tooth was not mobile; no fistulae were present; the tooth had at least one caries free or properl...

Chip size distribution is an important quality variable not only for buyers of forest fuels, but also for chipping contractors as it influences both fuel consumption and productivity of chippers. Studies of disc chippers and of drum chippers with closed drums have shown that increased chip target length increases chipper productivity and decreases fuel consumption per ton of chips produced. For...

A time and motion study was conducted to determine the produciivity and cost of an in-woods chipping operation when processing whole mall-diameter trees for biomoss. The study removed biomass from two overstocked stands and compared the cost of this treatment to existing alternatives. The treatment stands consisted of a 30-year-old longleaf pine stand and o 37-year-old loblolly pine stand. In t...