Why is a hollow steel pipe of the same thickness 20 harder than a solid steel rod

Hello! If it refers to hardness, hehe, this is only related to the material itself. The steel grade of the same thick steel pipe and steel rod is different, and the natural hardness is different.

If it refers to strength or stiffness, it also depends on the specific load nature. If it is only stretched, the steel rod must be "harder" than the steel pipe if it is of the same thickness (and the same grade). In terms of twisting and bending, it is not necessarily that steel rods are stronger than steel pipes.

Because, in torsion and bending, it is mainly related to the shape of the cross-section of the specimen (specifically referring to its torsional stiffness and bending stiffness), and in terms of tensile, only the size of the cross-sectional area can be seen.

It only represents a personal opinion, don't spray if you don't like it, thank you.

This involves mechanics in physics, because the hollow steel pipe will be dispersed when the force is stressed, so that people feel that the hollow steel pipe is harder than the same core steel rod, which is one of them!

Second, there is a certain gravitational force and repulsion between iron molecules, when the steel rod is stressed, the molecular force direction of the force point is the same, but the steel pipe is different, the force on the front side of the force point and the opposite side of the molecule are different!

The torsion resistance is almost the same as that of the solid, because the steel closer to the central shaft does not play a great role in bearing torsion, but the weight of the solid is large and the cost is high, so the general transmission pipe is a hollow tube, and the load-bearing tube is definitely a solid tube greater than the hollow tube, because the shear resistance coefficient of the solid is larger, and the bending coefficient is also greater than the solid one, so the solid tube and the hollow tube are higher than the performance parameters, and there is no such thing as you say that the solid is harder than the hollow

Is a hollow steel pipe of the same thickness stiffer than a solid steel rod? This is a misconception. Imagine.

Will the steel rod be soft if you add a steel rod to the steel pipe? Will it be hard if you hollow out the center of the?

Hollow steel pipes are harder than solid steel rods" has one premise: it is made with the same amount of the same material.

The landlord misremembered, it was the same cross-sectional area of the steel pipe compared to the steel bar.

Summary. When you bend the steel pipe in a certain direction, the hollow one will not be deformed due to the support force against the bending direction, and the solid one will easily break because the bending surface has no support force.

Of the same thickness of steel pipes, which is stronger, hollow or solid? Why?

Hello, it is a pleasure to serve you.

When you bend the steel pipe in a certain direction, the hollow one is not deformed due to the support force of the beam brigade against the bending direction, and the real Zhen Xunxin is easy to break because the bending surface has no support force.

So the hollow is stronger.

Hello, if the two ends of the hollow are welded with a 20 cm long solid bearing position, will this be firm?

How long does it take to make a screen shaft with a hollow tube like this to be solid into the hollow tube?

Take the length of the helix on the mandrel as the circumference, and solve the radius to make the inner hole; The outer radius is the inner hole radius plus the blade height (don't forget to leave a gap).

Summary. Hello, it must be hollow and easy to bend. On the premise that all external conditions are equal, there is no support in the middle of the hollow, and there is all support inside the solid.

Solid and hollow steel pipes of the same diameter, the same length, and the same material, which are easy to bend.

Hello, it must be a hollow Chang Zhao easy to resist the bending of the shed. Under the premise that all external conditions are the same, there is no support in the middle of the hollow, and the whole and Hu in the solid are the supports.

What is the basis for these people in the picture.

Hello, I don't remember this very well, your two pictures give two opposite answers, one is still a homework help. I'll give you a hungry stool here is hollow and easy to bend, give you an analogy, two straws, one tube is stuffed with the East and West, and the other is not stuffed, you can also try it yourself, which rotten brigade is easier to bend.