# Tensile Test of Slip Ring - Working out Tensile Strength

• Delvaurius
In summary, the conversation discusses a tensile test technique according to the BS HC 403:1977 standard. The technique involves pulling a ring with a slit in a tensile machine and using an equation to calculate the tensile strength. The equation is S = (3*P*((D/t)-1)) / b*t, where S is stress, P is load, D is outer diameter, t is radial thickness, and b is width. The person is seeking the derivation of the original formula, which is S = 3P((D/t) - 1).
Delvaurius
All,

Through work, I've recently been tasked with investigating a very old tensile test technique, according to BS HC 403:1977 (now withdrawn).

Essentially, you take a ring. Anywhere along it you make a slit all the way through. You then pull that ring in a tensile machine, ensuring that the slit is perpendicular to the direction of force.

The standard then states, to work out the tensile strength, use the equation:

S = (3*P*((D/t)-1)) / b*t

S = Stress, P = Load, D = Outer Diameter, t = radial thickness, b = width.

Now I get the whole thing over (b*t) where b*t is the cross sectional area of the ring, meeting S=F/A.

How is Force = 3P((D/t) - 1) derived?

Thanks for any help!

In your converted formula F = P; instead, you should be seeking the derivation of the original formula as stated.

## 1. What is a tensile test and why is it important?

A tensile test is a mechanical test used to determine the strength and ductility of a material. It involves pulling a sample of the material until it breaks, and measuring the amount of force required to do so. This test is important because it helps engineers and scientists understand the properties of a material, which is crucial for designing and manufacturing products that can withstand different levels of stress and strain.

## 2. How is a tensile test performed on a slip ring?

To perform a tensile test on a slip ring, the ring is first mounted onto a tensile testing machine. The machine then applies a gradual and controlled force to the ring, pulling it until it breaks. During this process, various measurements such as the load applied and the displacement of the ring are recorded. These measurements are used to calculate the tensile strength of the slip ring.

## 3. What is the tensile strength of a slip ring and how is it calculated?

The tensile strength of a slip ring is the maximum amount of stress it can withstand before breaking. It is calculated by dividing the maximum load applied during the test by the cross-sectional area of the ring. The resulting unit is usually in pounds per square inch (psi) or megapascals (MPa).

## 4. What factors can affect the tensile strength of a slip ring?

There are several factors that can affect the tensile strength of a slip ring, including the material it is made of, its manufacturing process, and any external factors such as temperature and humidity. The quality and condition of the slip ring also play a significant role in its tensile strength.

## 5. How is the data from a tensile test of a slip ring used in real-world applications?

The data collected from a tensile test of a slip ring is used to determine the appropriate material and design for different applications. For example, the data can help engineers choose the right slip ring for a specific project, such as in the construction of a bridge or a high-rise building. It can also be used to identify any weaknesses in the slip ring and make improvements for future designs.

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