Strength indicators include: elastic limit, yield limit and strength limit.
Elastic limit: used to indicate the maximum limit of pure elastic deformation of materials. When the tensile external force per unit cross-sectional area of metal material reaches this limit, the material will undergo elastic-plastic deformation. The stress value corresponding to this limit.
Yield limit: used to express the ability of materials to resist small plastic deformation. The yield limit is divided into physical yield limit and conditional yield limit.
Strength limit: the maximum ability of a material to resist external damage, which is called the strength limit of a material. That is to say, when the tensile stress on the cross section of the material reaches the strength limit of the material, the material will be pulled off.
Intensity has different explanations in different disciplines, and there are three main explanations:
1) strength refers to the strength of the acting force and a certain quantity (such as electric field, current, magnetization, radiation or radioactivity), such as electric field strength.
For example, the fourth part of Hong Shen's Elementary Knowledge of Drama Directors: "The intensity of the light depends on what the director wants the audience to see at a certain moment.
2) The intensity of a behavior is the same as the concept used by behaviorists in learning and conditioning research, which can be extended to the degree of experiencing emotions, persisting in beliefs and adopting attitudes.
3) In the crowding theory of environmental psychology, the psychological pressure caused by crowding phenomenon is expressed.