Tensile Lap-Shear Testing

In summary, the bond fails before the foil does, so the tensile lap shear strength is calculated by dividing the breaking force, in Newtons (500N), by the shear area, in square millimetres.
  • #1
Javaid
2
0
Hi,
I am new to the tensile testing and still learning and would really appreciate the answer to a problem that I have been having.
I performed a lap-shear test on two foils of copper bonded in single lap joint. The copper broke before the bond does giving me a force of say 500N. I want to calculate the tensile lap shear strength. As per my understanding it should be achieved by by dividing the breaking force, in Newtons (500N), by the shear area, in square millimetres. But which is the shear area? Is it the width of the foil/bond multiplied by the thickness of the bonded area or is it the width of the foil/bond multiplied by the length of the bond?
Also, can this test give me the shear strength of the bond? (As the answer to this question is based on the answer to the previous question, I will ask it afterwards but it is here in case someone is kind enough to solve this problem for me)
Thanks in advance :)
 
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  • #2
Javaid said:
Hi,
But which is the shear area?
Hi; welcome aboard.
While I can't help with the actual problem, I have to ask you about terminology. Regardless of what you're trying to test, I would consider the point at which the foil tears to be the "shear area". I'm not educated in the field, though, so I might be missing something.
 
  • #3
By shear area (cross-sectional area in square millimetres), I meant the value that will be used to divide with the breaking force to calculate tensile lap shear strength.
The foil tears outside the bonded region and I am confused how to calculate the tensile lap shear strength which should be be achieved by dividing the breaking force, in Newtons (500N), by the shear area, in square millimetres. Hence the question...
 
  • #4
Okay. Good luck with it. I haven't a clue, but someone here will be able to help.
 
  • #5
Javaid said:
By shear area (cross-sectional area in square millimetres), I meant the value that will be used to divide with the breaking force to calculate tensile lap shear strength.
The foil tears outside the bonded region and I am confused how to calculate the tensile lap shear strength which should be be achieved by dividing the breaking force, in Newtons (500N), by the shear area, in square millimetres. Hence the question...
You can't calculate the shear strength of the bond if the metal itself already failed. The shear area of the bond you want is length times width. The tensile breaking strength of the copper divided by the shear area gives you the shear stress in the bond at the time of failure of the copper itself. The shear strength of the bond will thus be higher, so if you want to test it, you have to use thicker copper or a smaller shear area (reduced bond length) I would think.
 

What is Tensile Lap-Shear Testing?

Tensile Lap-Shear Testing is a type of mechanical testing used to measure the strength and integrity of a bond between two materials. It involves pulling or shearing the two materials in opposite directions to determine the force at which the bond fails.

What are the benefits of using Tensile Lap-Shear Testing?

Tensile Lap-Shear Testing can provide important information about the strength and durability of adhesive bonds between materials. It can also help identify potential weaknesses or defects in the bonding process, allowing for improvements to be made before production.

What materials can be tested using Tensile Lap-Shear Testing?

Tensile Lap-Shear Testing can be used on a variety of materials, including metals, plastics, composites, and adhesives. It is commonly used in industries such as automotive, aerospace, and construction.

What factors can affect the results of Tensile Lap-Shear Testing?

The results of Tensile Lap-Shear Testing can be affected by factors such as the type and strength of the adhesive, surface preparation of the materials, and the testing conditions (e.g. temperature, humidity). It is important to carefully control these variables to ensure accurate and reliable results.

How is Tensile Lap-Shear Testing performed?

Tensile Lap-Shear Testing is typically performed using a specialized testing machine that applies a controlled force to the bonded materials. The amount of force required to break the bond is measured and used to calculate the strength of the bond. The test is usually repeated multiple times to ensure consistency and accuracy of the results.

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