Lecture
The stability of compressed rods is based on the requirement that the allowable stress should be less than the yield strength  . |
Dividing the yield strength in compression  on the safety factor for turnover n t we get the allowable compressive stress for short rods (type of samples): |
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Now it is necessary to reduce this allowable voltage so that it is less . But critical stress depends on the flexibility of the rod  (the more the less ) and from the rack material. These factors are taken into account in  -reduction factor reduction ratio. Coefficient taken from tables depending on and material. |
| The permissible compressive strength for a flexible rod is determined by the formula |
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Where  - permissible compressive stress with regard to stability. |
| In fig. 8.3 the dashed line gives a graph of the dependence of the allowable stress of a joint on the flexibility of the rack . |
| There are direct and inverse problem design calculation. |
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Strength of materials
Terms: Strength of materials