How do you do a bolted joint analysis?
The bolted joint works by inducing an initial clamping force (“preload”) on the joint by threading the fastener into either a nut or into threads that have been tapped into one of the parts….Torque to Obtain Preload.
| Bolt Condition | KT |
|---|---|
| Zinc-plated | 0.20 |
| Lubricated | 0.18 |
| With Anti-Seize | 0.12 |
How do you calculate bolt load?
Tensile strength is the mechanical property most widely associated with standard threaded fasteners. Tensile strength is the maximum tension-applied load the fastener can support prior to fracture. The tensile load a fastener can withstand is determined by the formula P = St x As.
Which are the applications of bolted joints?
Clamped bolted joints are often used on pipe flanges, automotive engines and chemical reactors. In all of these applications, the bolted joint has three mechanical components: the flange parts, the fasteners (bolts and nuts), and the seals or gaskets.
How do you design a bolt size?
A typical rule of thumb . . . Use a bolt diameter that is 1.5 – 2.5 times (up to three times) the thickness of the thinner material you are bolting together. So, for 1/8″ material, a 1/4″ diameter is often a good bolt choice. For 1/4″ thick material, perhaps a 3/8″ or 1/2″ bolt.
What are the failure modes of bolted joints?
The causes of bolt and and bolted joint failure can occur as a result of any of the following five mechanism failures….Excessive bearing stress under the nut face, bolt head, or within the joint itself.
- Insufficient Joint Clamp Force.
- Bolt Thread Stripping.
- Bolt Fatigue Failures.
- Bolt Overload.
- Excessive Bearing Stress.
What are the different types of bolted joints?
There are two main types of bolted joint designs: tension joints and shear joints.
How long should bolts be?
A good rule to follow is to always use the shortest standard length fastener that gives a minimum one thread protrusion. Small and/or short bolts come in 1/8- or 1/4-inch increments. As the fastener gets larger and longer the increments change to 1/2 inch.
How is bolt thickness measured?
To measure the diameter of screws and bolts, you measure the distance from the outer thread on one side to the outer thread on the other side. This is called the major diameter and will usually be the proper size of the bolt.