Bolt shearing: Difference between revisions
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Collection of resources to understand how grade of bolts relates to shear strength | Collection of resources to understand how grade of bolts relates to shear strength | ||
=Bolt Strength= | =Simple Bolt Strength= | ||
'''[http://www.boltdepot.com/fastener-information/Materials-and-Grades/Bolt-Grade-Chart.aspx Bolt Grade Chart]''' - This page shows the tensile strength of different bolt grades for both Imperial and Metric. | '''[http://www.boltdepot.com/fastener-information/Materials-and-Grades/Bolt-Grade-Chart.aspx Bolt Grade Chart]''' - This page shows the tensile strength of different bolt grades for both Imperial and Metric. | ||
'''[http://www.rockcrawler.com/techreports/fasteners/index.asp Shear Strength Analysis]''' - Resource for calculations used here | |||
=Example Calculation= | Although no official '''shear strength''' values are calculated, the common acceptance is that the ultimate shear strength of a bolt is approximately 60% of the minimum ultimate tensile strength. | ||
=Simple Example Calculation= | |||
Comparison between a 3/4" Grade 2, Grade 5 and Grade 8 bolt. | Comparison between a 3/4" Grade 2, Grade 5 and Grade 8 bolt. | ||
To get the shear loading force you take the calculated shear strength and multiply it by the cross-sectional area of the fastener | |||
==Cross-Sectional Area of 3/4" Bolt== | |||
Diameter = .75" (Threads excluded bolt) | |||
r= dia/2 | |||
A = pi * r^2 | |||
A = 3.1416 * (0.75/2)^2 | |||
A = .4418in^2 | |||
==Shear Capability== | |||
Capability in shear = Shear strength (pounds/in^2) * Cross sectional Area (in^2) | |||
{| class="wikitable" | |||
|- | |||
!Bolt Grade | |||
!Minimum Tensile Strength (psi) | |||
!Shear Strength (psi) | |||
!Shear Capability (lbs) | |||
|- align="center" | |||
| 2 || 74,000 || 44,400 || 78,000 | |||
|- align="center" | |||
| 5 || 120,000 || 72,000 || 127,000 | |||
|- align="center" | |||
| 8 || 150,000 || 90,000 || 159,000 | |||
|} | |||
=Advanced Analysis= | |||
Situation specific analysis is required for actual meaningful data. Additional information on this can be found in the '''Machinery's Handbook under Working Strength of Bolts'''. | |||
{{Wanted| If anyone has access to a Machinery's Handbook and can provide further information that would be great!}} | |||
Latest revision as of 09:57, 28 April 2013
Overview
Collection of resources to understand how grade of bolts relates to shear strength
Simple Bolt Strength
Bolt Grade Chart - This page shows the tensile strength of different bolt grades for both Imperial and Metric.
Shear Strength Analysis - Resource for calculations used here
Although no official shear strength values are calculated, the common acceptance is that the ultimate shear strength of a bolt is approximately 60% of the minimum ultimate tensile strength.
Simple Example Calculation
Comparison between a 3/4" Grade 2, Grade 5 and Grade 8 bolt.
To get the shear loading force you take the calculated shear strength and multiply it by the cross-sectional area of the fastener
Cross-Sectional Area of 3/4" Bolt
Diameter = .75" (Threads excluded bolt)
r= dia/2
A = pi * r^2
A = 3.1416 * (0.75/2)^2
A = .4418in^2
Shear Capability
Capability in shear = Shear strength (pounds/in^2) * Cross sectional Area (in^2)
| Bolt Grade | Minimum Tensile Strength (psi) | Shear Strength (psi) | Shear Capability (lbs) |
|---|---|---|---|
| 2 | 74,000 | 44,400 | 78,000 |
| 5 | 120,000 | 72,000 | 127,000 |
| 8 | 150,000 | 90,000 | 159,000 |
Advanced Analysis
Situation specific analysis is required for actual meaningful data. Additional information on this can be found in the Machinery's Handbook under Working Strength of Bolts.
Wanted: If anyone has access to a Machinery's Handbook and can provide further information that would be great!