Inspection Lighting for the Visual Detection of Surface Flaws in Zinc Die Castings

1971 ◽  
Author(s):  
Dennis N. Storey
Keyword(s):  
Visual Detection ◽  
Surface Flaws ◽  
Die Castings

Sem Examinations of Glass Knives

1970 ◽  
Vol 28 ◽  
pp. 282-283
Author(s):  
J. Temple Black
Keyword(s):  
Plastic Deformation ◽  
Tensile Loading ◽  
Resultant Force ◽  
Stress Concentrations ◽  
Edge Chipping ◽  
Surface Flaws ◽  
Edge Defects ◽  
Microscopic Surface

There are two types of edge defects common to glass knives as typically prepared for microtomy purposes: 1) striations and 2) edge chipping. The former is a function of the free breaking process while edge chipping results from usage or bumping of the edge. Because glass has no well defined planes in its structure, it should be highly resistant to plastic deformation of any sort, including tensile loading. In practice, prevention of microscopic surface flaws is impossible. The surface flaws produce stress concentrations so that tensile strengths in glass are typically 10-20 kpsi and vary only slightly with composition. If glass can be kept in compression, wherein failure is literally unknown (1), it will remain intact for long periods of time. Forces acting on the tool in microtomy produce a resultant force that acts to keep the edge in compression.

Glass Knife Geometry as Seen by the SEM

1971 ◽  
Vol 29 ◽  
pp. 454-455
Author(s):  
J. Temple Black
Keyword(s):  
Low Cost ◽  
Amorphous Material ◽  
Stress Concentrations ◽  
Basic Tool ◽  
Tool Materials ◽  
Optical Inspection ◽  
Surface Flaws ◽  
Slip Planes ◽  
Glass Knife ◽  
Diamond Knife

In ultramicrotomy, the two basic tool materials are glass and diamond. Glass because of its low cost and ease of manufacture of the knife itself is still widely used despite the superiority of diamond knives in many applications. Both kinds of knives produce plastic deformation in the microtomed section due to the nature of the cutting process and microscopic chips in the edge of the knife. Because glass has no well defined slip planes in its structure (it's an amorphous material), it is very strong and essentially never fails in compression. However, surface flaws produce stress concentrations which reduce the strength of glass to 10,000 to 20,000 psi from its theoretical or flaw free values of 1 to 2 million psi. While the microchips in the edge of the glass or diamond knife are generally too small to be observed in the SEM, the second common type of defect can be identified. This is the striations (also termed the check marks or feathers) which are always present over the entire edge of a glass knife regardless of whether or not they are visable under optical inspection. These steps in the cutting edge can be observed in the SEM by proper preparation of carefully broken knives and orientation of the knife, with respect to the scanning beam.

Anxious anticipation prolongs emotional interference for rapid visual detection.

Emotion ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1127-1137
Author(s):  
Nadia Haddara ◽  
Jonathan Ravid ◽  
Erica L. Miller ◽  
Molly O'Hagan ◽  
Chris Caracciolo ◽  
...  
Keyword(s):  
Visual Detection ◽  
Emotional Interference

LANXIDE 92-X-2050

Alloy Digest ◽  
1997 ◽  
Vol 46 (11) ◽  
Keyword(s):  
Silicon Carbide ◽  
Physical Properties ◽  
Tensile Properties ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Iron Alloy ◽  
Alloy Matrix ◽  
Die Castings ◽  
Silicon Carbide Particulate

Abstract Lanxide 92-X-2050 is an aluminum-10 Silicon-1 Magnesium-1 Iron alloy with 30 vol.% of silicon carbide particulate. This metal-matrix composite is designed to outperform the unreinforced counterpart. The alloy-matrix composite is available as die castings. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fatigue. It also includes information on casting. Filing Code: AL-343. Producer or source: Lanxide Corporation.

COPPER ALLOY No. 878

Alloy Digest ◽  
1979 ◽  
Vol 28 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Copper Alloy ◽  
Die Casting ◽  
Heat Treating ◽  
Casting Alloys ◽  
Copper Zinc ◽  
Die Castings ◽  
Very High

Abstract Copper Alloy No. 878 is a copper-zinc-silicon alloy for die castings. Among the brass die-casting alloys, it has the highest strength, hardness and wear resistance; however, it is the most difficult to machine. It is used where very high requirements must be met for strength and wear resistance. Its many applications include tools, pump impellers, gears and marine hardware. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Cu-386. Producer or source: Copper alloy producers.

Sign in / Sign up

Export Citation Format

Share Document