3. Thermal stresses
When parts assembled with pre-tightening are subjected to significant temperature variations, the stress variations caused either by a difference between the temperature of the bolt TB and the temperature of the parts TP , or by a difference between the linear expansion coefficients of the bolts αLB and the parts αLP , are generally not negligible.
3.1 General expression of stress variation
If we denote T0 as the reference temperature (temperature at prestressing), we have:
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Variation in bolt length due to temperature variation (TB– T0):
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Thermal stresses
Contact pressure between assembled parts
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