细丝 发表于 2025-3-23 12:55:01
Problems in Polar CoördinatesPolar coördinates . are particularly suited to problems in which the boundaries can be expressed in terms of equations like . .. This includes the stresses in a circular disk or around a circular hole, the curved beam with circular boundaries and the wedge, all of which will be discussed in this and subsequent chapters.semiskilled 发表于 2025-3-23 16:19:48
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ThermoelasticityMost materials tend to expand if their temperature rises and, to a first approximation, the expansion is proportional to the temperature change.模范 发表于 2025-3-24 04:12:46
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t is essentially a vector theory, being concerned with forces. However, the idea of a scalar gravitational potential can be introduced by defining the work done in moving a unit mass from infinity to a given point in the field. The principle of conservation of energy requires that this be a unique fTremor 发表于 2025-3-24 20:51:12
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