Theoretical mechanics is usually divided into three parts: statics, kinematics and dynamics. Statics studies the simplified theory of force system acting on objects and the equilibrium conditions of force system; Kinematics only studies the mechanical motion characteristics of objects from the geometric point of view, and does not involve the force of objects; Dynamics studies the relationship between mechanical motion and force. Dynamics is the core of theoretical mechanics.
Mechanics of materials studies the stress, strain, stiffness and strength of materials under various forces and moments. It is usually a compulsory course for college students majoring in mechanical engineering, civil engineering, architectural engineering and related majors. Usually, before studying material mechanics, they are required to study applied mechanics first.
Extended data:
The working object of mechanical engineering is power machinery, and its working conditions will change greatly. This change is sometimes random and unpredictable; The practical application of materials is not completely unified, and there may be various defects; There is a certain deviation in machining accuracy, and so on.
Compared with civil engineering with static structure as the working object, various problems in mechanical engineering are more difficult to be solved accurately by theory. Therefore, early mechanical engineering only used simple theoretical concepts and combined with practical experience. Design and calculation mostly rely on empirical formulas; In order to ensure safety, they are all conservative. As a result, the machinery made is bulky, costly, low in productivity and high in energy consumption.
Since18th century, the birth of new theories and the development of mathematical methods have continuously improved the accuracy of design and calculation. In the 20th century, various experimental stress analysis methods appeared, and people have been able to measure the stress of various parts of models and objects by experimental methods.
Baidu encyclopedia-material mechanics
Baidu encyclopedia-mechanics