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Craquelure in the Mona Lisa, with a typical "Italian" pattern of small rectangular blocks Age craquelure in pottery. Craquelure (French: craquelure; Italian: crettatura) is a fine pattern of dense cracking formed on the surface of materials. It can be a result of drying, shock, aging, intentional patterning, or a combination of all four.
Cracking may appear in greenware as well as each stage of the firing including bisqueware and glazed ware. [1] Fracture in greenware resulting in stresses during the making. To avoid cracks in greenware uniformity should be maintained in the thickness of the pot, the drying of the greenware, as well as consistency of the clay body itself.
Terracotta flower pots with terracotta tiles in the background Due to its porosity, fired earthenware, with a water absorption of 5-8%, must be glazed to be watertight. [ 11 ] Earthenware has lower mechanical strength than bone china, porcelain or stoneware, and consequently articles are commonly made in thicker cross-section, although they are ...
The coarser particles in the clay also acted to restrain shrinkage during drying, and hence reduce the risk of cracking. Form: In the main, early bonfire-fired wares were made with rounded bottoms to avoid sharp angles that might be susceptible to cracking. Glazing: the earliest pots were not glazed.
An invariant point on an equilibrium diagram. A mixture of two substances which has the lowest melting point in the whole series of possible compositions. Engobe A slip coating applied to a ceramic body for imparting colour, opacity or other characteristics. Sometimes distinguished from slip by the addition of non-clay materials, and sometimes not.
Terracotta will also ring if lightly struck, as long as it is not cracked. [33] Painted (polychrome) terracotta is typically first covered with a thin coat of gesso, then painted. It is widely used, but only suitable for indoor positions and much less durable than fired colors in or under a ceramic glaze.
Cracking pattern may refer to: Cracking pattern (engineering), the fracture surfaces of materials; Cracking pattern (painting), the fine pattern of dense cracking formed on the surface of paintings; Patterns in nature#Cracks, the patterns formed by cracks of different types in nature
The specimen is placed on the work table and a notch is created exactly at the centre. The crack should be generated such that the defect length is about half the depth. The load applied on the specimen is generally a three-point bending load. A type of strain gauge called a crack-mouth clip gage is used to measure the crack opening. [3]