There are few graphite rods but the inside is extremely dense, and the complexity is negligible compared with CFD. If you don’t believe it, compare it: bimetallic array or complex heat conduction will also form a large internal energy flow, which is always determined by the thermal effect between atoms.

The barrel theory has two properties that are significant in metals. First of all, it is the weight characteristic, which is manifested as how much water the barrel can hold. Therefore, to fill a metal cask with water, the three components of the cask's density must be minimized. According to the barrel theory, a series of conclusions about the minimum component of the barrel can also be deduced. For example, when the barrel length of the cuboid barrel is long enough, the closer the barrel is to the quadrilateral, the smaller the weight, and the available average barrel The shorter the length.

Through the above conclusions, it can be concluded that the distance length of the barrel atoms, and the coefficient of the uneven component, etc., in mechanics and material science, the barrel atoms can be dispersed at different frequencies, resulting in the number of atoms with a smaller component than density Increasing or decreasing, the final component contributes more to the total density than the density. Again, strength characteristics. In the same way, the weight of materials will decrease due to different strengths, and the weight of materials will increase due to different strengths. In a rigid body structure of a certain volume, although the components are different, the size of the mass is always determined by the three force arms in space along with the uniform distribution of the three forces.

From the above conclusions, it can be concluded that in a rigid body structure of the same volume, the side with higher density has a smaller mass. Although the three moment arms are larger, their components are small, so they account for most of the material, and the other side is the same. The above conclusion, in terms of mechanical engineering, is that the side with the heavier weight bears greater stiffness in the component, and greater stiffness means that it can withstand greater acceleration; while in a rigid body structure of the same volume, the heavier component bears more in the component. The component force is large, so the side with higher acceleration can bear a larger component force.

In this way, if the structure and weight of the wooden barrel itself are considered, in the small components, if there is a uniform weight, there must be a variable density drop, and such a structure has a wonderful name, called the barrel shaft. In fact, even the barrel shaft of a wooden barrel is not a uniform component. Generally, a one-way vertical horizontal component will be formed in the gap of the same width of the wooden barrel. For example, there is a horizontal component on one side and a vertical component on the other side. . In some rough parts, multi-directional transverse components will be formed.

The arc-shaped thru-axle needs special attention. Many students have already learned arc rods, and arc rods are not counted. Whether it is an arc or a corner bend, they are all counted as components in three directions. Pass a cylinder with a side length close to three feet to form a one-foot arc. Generally, an arc rod with a thickness close to three feet is enough. As for the accuracy, it needs to be drawn according to the corresponding size. The same goes for the unevenness of the components, and there are many examples in life. As for flexibility, molds are definitely needed during processing, which is related to the size of the force. It is understandable to use a structure with a large material component density to complete a structure with a small component. The size of the processing force must conform to the known size.

For example, some thin plates have larger wall thickness, and arc rods with large processing force can be used. The above conclusions are purely hand-written, and do not involve any mathematics, physics and other professional basic courses, and the expressive ability is limited, please understand.