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In mechanics, a cylinder stress is a stress distribution with rotational symmetry; that is, which remains unchanged if the stressed object is rotated about some fixed axis. Cylinder stress patterns include: * Circumferential stress or hoop stress, a normal stress in the tangential (azimuth) direction; * Axial stress, a normal stress parallel to the axis of cylindrical symmetry; * Radial stress, a stress in directions coplanar with but perpendicular to the symmetry axis. The classical example (and namesake) of hoop stress is the tension applied to the iron bands, or hoops, of a wooden barrel. In a straight, closed pipe, any force applied to the cylindrical pipe wall by a pressure differential will ultimately give rise to hoop stresses. Similarly, if this pipe has flat end caps, any force applied to them by static pressure will induce a perpendicular ''axial stress'' on the same pipe wall. Thin sections often have negligibly small ''radial stress'', but accurate models of thicker-walled cylindrical shells require such stresses to be taken into account. ==Definitions== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cylinder stress」の詳細全文を読む スポンサード リンク
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