Impact Strength (mild steel tubing)

In summary, the conversation is about calculating the percentage increase in impact strength by inserting a 1" OD round tube with .083 wall inside a square 1 3/4" width tube with a .059 wall, both made of mild steel ERW tubing. The speaker also mentions the need for knowing the tensile strength and fracture toughness and provides links for examples of the types of mild steel and specifications needed for the calculations.
  • #1
Restomod
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I need to calculate what percentage increase in impact strength I will get by inserting a 1" OD round tube with .083 wall inside a square 1 3/4" width tube with a .059 wall. Both are mild steel, ERW tubing. Check attached file for diagram.

I can find out the tensile strength, if that is needed in the calculations. Can anyone help in how to go about this ?

Thx.
 

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  • #2
What equations is one using? What type of mild steel - and it annealed or cold-worked? What is between the pipes?

Here is an example of a 1020 steel (as rolled) - http://www.matweb.com/search/SpecificMaterial.asp?bassnum=M1020D

Here is an example of an ASTM A53 Grade A/B
http://www.macsfs.com/pdf/astma53grabp1718.pdf [Broken]

In addition to tensile strength, one would need to know fracture toughness.
 
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  • #3


To calculate the impact strength of the mild steel tubing, we need to first understand what impact strength is. Impact strength is a measure of how well a material can withstand sudden impact or shock without breaking. It is typically measured in joules or foot-pounds.

To determine the percentage increase in impact strength by inserting a 1" OD round tube with .083 wall inside a square 1 3/4" width tube with a .059 wall, we will need to compare the impact strengths of the two tubes separately and then calculate the difference.

First, we need to find the impact strength of the 1" OD round tube with .083 wall. This can be done by conducting a Charpy impact test, which involves striking a notched sample of the material with a pendulum hammer and measuring the energy absorbed by the material. The higher the energy absorbed, the higher the impact strength.

Next, we need to find the impact strength of the square 1 3/4" width tube with a .059 wall. Again, this can be done through a Charpy impact test.

Once we have the impact strengths of both tubes, we can calculate the difference between the two. Let's say the impact strength of the 1" OD round tube with .083 wall is 50 joules and the impact strength of the square 1 3/4" width tube with a .059 wall is 40 joules. The difference would be 50 - 40 = 10 joules.

To calculate the percentage increase, we can use the following formula:

Percentage increase = (Difference in impact strength / Impact strength of the smaller tube) x 100

In this case, the percentage increase would be (10/40) x 100 = 25%.

Therefore, by inserting the 1" OD round tube with .083 wall inside the square 1 3/4" width tube with a .059 wall, the impact strength would increase by 25%.

It is important to note that tensile strength is not directly related to impact strength, so it is not necessary to include it in these calculations. However, it is still a valuable property to consider when selecting materials for certain applications.

I hope this helps in understanding how to calculate the impact strength and determine the percentage increase in impact strength for mild steel tubing. It is always important to conduct proper testing and calculations to ensure the safety and reliability of any materials used in various applications.
 

1. What is impact strength?

Impact strength is a measure of a material's ability to withstand sudden and intense forces without breaking or fracturing. In other words, it is a measure of a material's toughness.

2. How is impact strength measured?

Impact strength is usually measured using a pendulum impact test, in which a swinging pendulum is released onto a notched sample of the material. The height to which the pendulum swings after impact is measured, and this value is used to calculate the impact strength of the material.

3. Why is impact strength important for mild steel tubing?

Mild steel tubing is commonly used in structural applications, such as in buildings and bridges, where it may be subjected to sudden and intense forces. Therefore, it is important for mild steel tubing to have high impact strength in order to withstand these forces without breaking or fracturing.

4. What factors affect the impact strength of mild steel tubing?

The impact strength of mild steel tubing can be affected by various factors, such as the composition and microstructure of the steel, the manufacturing process, and any treatments or coatings applied to the tubing. Additionally, the temperature and rate of loading can also impact the material's impact strength.

5. How can the impact strength of mild steel tubing be improved?

The impact strength of mild steel tubing can be improved through various methods, such as selecting a higher strength grade of steel, using a different manufacturing process, or applying treatments or coatings that can increase the material's toughness. Additionally, controlling the temperature and rate of loading can also help improve the impact strength of the tubing.

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