______ is the ability of material to resist permanent change of shape caused by an external force.
举一反三
- 中国大学MOOC: When a body is caused to change its shape, the distorting force is proportional to the amount of the change, __________ the elastic limit is not exceeded.
- Which of the following is not an external force of change?
- The magnitude of the internal force of a bar depends on not only the external force but also the shape of its cross section. A: 正确 B: 错误
- Li Shizhen said,"Tense pulse is mainly about the force. Taut pulse is mainly about the shape. "It indicates that if tense pulse is small, but healthy qi is not deficient, the pulse force is large. Taut pulse shape is apparent, but pulse force is not always big.
- When member is subjected to the eccentric loads, the wrong description of neutral axis is ( ). A: The position of the neutral axis is independent of external forces and eccentricity B: The neutral axis and the point of the external force are on opposite sides of the cross section centroid respectively C: The neutral axis is related to the shape and size of the section D: The closer the external force point is to the centroid, the farther the neutral axis is from the centroid