Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Edge chipping

Flint is the noncrystalline form of silicon and has been known to humans since prehistoric times. When struck with a sharp blow, flint would flake off sharp-edged chips that were then used as cutting tools and weapons. [Pg.195]

Existence of defects ( picking, " edge chipping/edgewear, filling in of logos)... [Pg.280]

Wood.—Sohd wood fuel prepared for the purpose, is occasionally used under boilers in the Northwest. Split fir at 3 per cord, delivered, is about equivalent economically to the local low-grade coals at 2.20 per ton. Refuse wood fuels (slab, edgings, chips and sawdust) are more frequently employed. Suitable methods of feeding must be provided fine particles may be blown long distances. If the moisture content is large, a special furnace on the Dutch oven principle may be found necessary. Woods contain very little ash. [Pg.41]

Test Results Figure 40 shows, for each test, the average linear length machined by the diamond tools, before the tools were taken out on the basis of visible edge chipping of the floor panels. [Pg.614]

High hardness, enhancing abrasive wear resistance to maximize tool life Edge strength and toughness to prevent edge chipping... [Pg.139]

Danzer, R., Hangl, M., and Paar, R. (2001) Edge chipping of brittle materials, in Fractography of Glasses and Ceramics IV (eds J.R. Varner, G.D. Quinn, and V.D. Erechette), The American Ceramic Society, Westerville, Ohio, pp. 43-55. [Pg.571]

Chai, H. and Lawn, B.R. (2007) Edge chipping of brittle materials effects of side-wall inclination and loading angle. Int.J. Fract., 145, 159-165. [Pg.571]

TEST, FRACTURE TOUGHNESS TESTS EDGE CHIPPING TEST.). [Pg.170]

As with milling, drilling passage holes from both sides is recommended to prevent edge chipping in the aluminum bronzes. [Pg.491]

Figure 14.24 Rectangular block with severe edge chipping. Figure 14.24 Rectangular block with severe edge chipping.
Failure mode V Seal face edge chipping. Its causes are excessive shaft whip, excessive shaft deflection, and seal faces out-of-square. [Pg.150]

Chip (flaw) A region of a brittle material that is missing due to fracture, usually as a result of handling. The chip can be an edge chip or a surface chip. [Pg.580]

A NEW ANALYSIS OF THE EDGE CHIPPING RESISTANCE OF BRITTLE MATERIALS... [Pg.209]

Figure 1. The edge chipping test shown schematically. The force to make pop a chip off, F, depends upon the distance from the edge, d. Figure 1. The edge chipping test shown schematically. The force to make pop a chip off, F, depends upon the distance from the edge, d.
New Analysis of the Edge Chipping Resistance of Brittle Materials... [Pg.210]

Figure 2. Edge chips in two different materials, (a) shows a brittle chip in a 3Y-TZP zirconia, and (b) shows a row of chips about to pop off in intemipted tests on a softer polymethylmethacrylate based denture material. Notice the massive defoimations in (b). Figure 2. Edge chips in two different materials, (a) shows a brittle chip in a 3Y-TZP zirconia, and (b) shows a row of chips about to pop off in intemipted tests on a softer polymethylmethacrylate based denture material. Notice the massive defoimations in (b).
Thouless et al. derived a model based on buckling of an edge flake that predicted n=3. An indentation fracture mechanics model by Chai and Lawn for edge chip resistance is also consistent with the power law eq, 2, but only for the case of /r = 1.5. Although some of our data matched the power law with rr = 1.5, much of it did not. Exponents ranged from as small as 1 to as large as 2. Problems remain with the interpretation of the exponent n and the constant A. Is /r a fundamental material parameter indicative of a material s chipping behavior Can it be related to other material properties What are the units of A ... [Pg.211]

These doubts about the power law relationship led us to develop a phenomenological model and an alternative equation. A companion paper in the dental literature presents the new model. It matched all edge chip data extremely well, irrespective of material or indenter type. The purpose of this paper is to present this new model to the structural ceramic community, illustrate how well it fits dental material results, and apply it to several structural ceramics. [Pg.211]

Similar questions about force versus size functions have arisen in the past about interpretations of power law fits of hardness data for brittle materials. There are some parallels in hardness and edge chip testing. Both involve deformation and fracture. Fracture aroimd an indentation can alter the hardness response of brittle materials and can dramatically change the indentation size effect (ISE) whereby hardness varies with force or indentation size. TTie hardness, H, ot material is determined by the ratio of an applied load to the contact (or projected) area of an indentation ... [Pg.211]

A similar quadratic relationship may be applicable to edge chipping ... [Pg.212]

A commercial edge chipping machine (Engineering Systems Model CK 10, Nottingham, UK) was used to make the chips. The 1000 N load cell readout resolution was 0.1 N and the... [Pg.213]

Figures 4-8 and Table 2 show the edge chip data of Part 1 is fitted very well with the new quadratic relationship, eq. 8. The dashed veitical lines correspond to Figures 4-8 and Table 2 show the edge chip data of Part 1 is fitted very well with the new quadratic relationship, eq. 8. The dashed veitical lines correspond to </ = 0.5 mm, an arbitraiy distance which allows a simple comparison of the force necessary to create a chip at a set distance. The figures only show sha conical 120° results, but the table included some alternative indenter data sets for comparison. The linear fit, eq. 2, is shown as dashed line in each figure, and with the exception of the 3Y-TZP (Fig. 7a), was usually a poor fit In every instance, the new rpradratic fimction nearly overlapped the power law fits. Note drat both functions have only two fitting parameters. In three cases (Fig. 4a, the feldspathic porcelain Fig. 4b, the leucite glass ceramic and Fig. 7b, the alumina), the power law exponent was abmrt 1.5. Usually it was different, with values ranging from 1.0 to 2.0. Figure 9 combines all the polynomial graphs on one plot for comparison.
Figure 4. Edge chip results dental restorative materials, (a) is for a feldspathic porcelain (Mark 2) and (b) is for a leucite glass ceramic (Empress CAD). Figure 4. Edge chip results dental restorative materials, (a) is for a feldspathic porcelain (Mark 2) and (b) is for a leucite glass ceramic (Empress CAD).
See other pages where Edge chipping is mentioned: [Pg.207]    [Pg.211]    [Pg.446]    [Pg.457]    [Pg.207]    [Pg.211]    [Pg.390]    [Pg.51]    [Pg.443]    [Pg.217]    [Pg.241]    [Pg.373]    [Pg.889]    [Pg.134]    [Pg.227]    [Pg.189]    [Pg.737]    [Pg.490]    [Pg.209]    [Pg.209]    [Pg.212]    [Pg.213]   
See also in sourсe #XX -- [ Pg.465 ]



SEARCH



© 2024 chempedia.info