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A yardang is a long, narrow ridge or hill that has been formed by the erosion of soft rock, typically sandstone or siltstone.  Yardangs are usually found in arid or desert regions where wind erosion is a dominant process.  As wind-blown sand and dust particles collide with the soft rock surface, they erode the rock in a process called abrasion.  Over time, the wind can carve out these elongated ridges, which can be several meters high and hundreds of meters long. The word “yardang” comes from a Turkic word meaning “steep bank.”

Yield Strength

Yield strength is a mechanical property of materials that describes the amount of stress that a material can withstand before it begins to deform permanently.  In other words, it is the stress at which a material starts to yield or change its shape under pressure.  Yield strength is an important factor in the design of structures and components, as it determines the maximum load that a material can safely bear without undergoing plastic deformation.  The yield strength of a material can be determined through a variety of tests, such as tensile testing, compression testing, or bending tests. The yield strength is typically expressed in units of pounds per square inch (psi) or megapascals (MPa).

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