Optimizing Double Shear Bolt Design for Safe Load Bearing: A Case Study

In summary, the homework question asks for the design of a bolt to hold two members together under a tensile load of 40KN. A UTS 1250 class steel bolt and AA2014 alloy lugs are used. The equations for shear, tensile, and bearing failure are sigmaS = P/(2*A), sigmaT = P/2*(w-d), and sigmaBR = P/(d*t), respectively. To design the bolt, one approach is to try a diameter of 20 mm and determine if it can handle the loads in double shear and bearing. Adjustments can be made based on the critical failure mode.
  • #1
dilipdboss
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1. Homework Statement
A tensile load of 40KN is applied on a double shear joint. Design a bolt that holds the members safely without any kind of failure. A UTS 1250 class steel [allowable stress = 1080 MPa, Ultimate strength = 1250 MPa] bolt is used and the members (lugs) are made of AA2014 alloy [allowable stress=380 MPa, Ultimate strength = 420 MPa].

2. Homework Equations
shear failure: sigmaS = P/(2*A)
tensile failure: sigmaT = P/2*(w-d)
bearing failure: sigmaBR = P/(d*t)


thanx for the help.
 
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  • #2
One way of doing a 'design' like this is to try something. Try, say diameter = 20 mm and see what loads it can carry in double shear and bearing. decide which of these is critical. Compare that with the requirements of the question, and adjust accordingly.
 

What is the purpose of a double shear bolt?

A double shear bolt is used to securely join two or more components together, ensuring that they do not separate under heavy loads or vibrations. It is commonly used in structural applications, such as bridges and buildings, as well as in machinery and equipment.

How does a double shear bolt differ from a regular bolt?

A double shear bolt has two shear planes, meaning that the load is divided between two sections of the bolt instead of just one. This allows for greater strength and stability compared to a regular bolt, which only has one shear plane.

What factors should be considered when designing a double shear bolt?

When designing a double shear bolt, factors such as the material strength, shear strength, and bolt size must be taken into account. The load and vibration requirements of the application also play a significant role in determining the appropriate design.

What are the benefits of using a double shear bolt?

Using a double shear bolt provides increased strength and stability, making it a more reliable option for heavy-duty applications. It also helps to distribute the load evenly, reducing the risk of failure or damage to the components being joined.

What are some common materials used for double shear bolts?

Double shear bolts can be made from various materials, including steel, titanium, and aluminum. The choice of material depends on the specific application and the required strength and durability. Stainless steel is a common choice for its corrosion resistance, while high-strength alloys are used for heavy-duty applications.

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