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Tear Out Stress Formula:
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Bolt tear out stress is the stress that occurs when a force applied to a bolted joint causes the material to tear out around the bolt. It's an important consideration in mechanical design to prevent joint failure.
The calculator uses the tear out stress equation:
Where:
Explanation: The equation calculates the stress on the material when force is applied to a bolted connection, considering both the material thickness and the distance from the edge.
Details: Calculating tear out stress is crucial for ensuring bolted joints can withstand applied loads without failing. It helps determine minimum edge distances and material thicknesses required for safe operation.
Tips: Enter force in Newtons, thickness and distance in millimeters. All values must be positive numbers. The result is given in MPa (Megapascals).
Q1: What is a safe tear out stress value?
A: Safe values depend on the material. Typically, the calculated stress should be less than the material's allowable shear stress with an appropriate safety factor.
Q2: Why is there a factor of 2 in the equation?
A: The factor of 2 accounts for the two shear planes that typically exist in a bolted joint (one on each side of the bolt).
Q3: How does edge distance affect tear out stress?
A: Increasing edge distance reduces tear out stress. Most standards recommend minimum edge distances of 1.5-2 times the bolt diameter.
Q4: Does this calculation apply to all materials?
A: The basic calculation applies to all materials, but the interpretation of results must consider the specific material properties.
Q5: When should I be concerned about tear out stress?
A: Tear out is particularly important in thin materials, near edges, or when using high-strength bolts in lower-strength materials.