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Crazing is a spider web pattern of cracks penetrating the glaze. It is caused by tensile stresses greater than the glaze is able to withstand. [1] [2] Common reasons for such stresses are: a mismatch between the thermal expansions of glaze and body; from moisture expansion of the body; and in the case of glazed tiles fixed to a wall, movement of the wall or of the bonding material used to fix ...
As higher amounts of alkali leach from the glass cracks are likely to become deeper. Crizzling is a distinctive network of fine cracks in the glass which is visible to the naked eye. [3] [15] In some cases, the crazing can gain a more uniform appearance. [13] However, crizzling may not be uniform due to the creation of micro-climates on the ...
Also, if one is carrying a long and awkward object, one end may inadvertently enter the path of rotation of a ceiling fan's blades, which can cause damage to the fan. Building codes throughout the United States also prohibit industrial ceiling fans from being mounted with the blades closer than 10 feet from the floor for these reasons.
Edge strength: crack will form if the tensile strength of glass edge exceeds the critical point. Clean cut glass is the strongest and after that polished edge is strongest. Artificial heating and cooling: if heating or cooling vents are present, the glass can heat or cool excessively and may result in thermal stress.
the rate of crack growth and fatigue life of components such as a coupon or a full-scale test article. location of critical regions; degree of fail-safety when part of the structure fails; the origin and cause of the crack initiating defect from fractographic examination of the crack.
mild steel cracks in the presence of alkali (e.g. boiler cracking and caustic stress corrosion cracking) and nitrates; copper alloys crack in ammoniacal solutions (season cracking); high-tensile steels have been known to crack in an unexpectedly brittle manner in a whole variety of aqueous environments, especially when chlorides are present.
Maybe, you are concerned about the Detroit Lions' cracks: a sudden rash of turnovers and pass protection issues. But Dan Campbell has a plan.
Crazes (surface cracks) produced by ESC in PMMA drinking beaker. Environmental Stress Cracking (ESC) is one of the most common causes of unexpected brittle failure of thermoplastic (especially amorphous) polymers known at present. According to ASTM D883, stress cracking is defined as "an external or internal crack in a plastic caused by tensile ...