Thermal Analysis of High Temperature Joints

DESIGNING FASTENERS FOR HIGH TEMPERATURE JOINTS: Thermal Analysis of High Temperature Joints

Fastener temperature has a critical effect on joint performance in high-temperature applications. The temperature profile in those applications determines the proper fastener that can maintain joint integrity and long term durability.

The key to maintaining joint integrity is to understand the effect elevated temperature has on the fastener. Surface and core temperature are affected to varying degrees based on joint material, exposure time, air circulation, and proximity to the heat source. In high temperature applications, evaluating the peak fastener temperature is crucial. Temperature is typically measured on the surface of the fastener or mating component.

Thermal analysis is used to determine joint behavior under high temperature cycling. Dissimilarities in the thermal expansion rate between joint components magnifies the effects of creep, stress concentrations, bending loads, etc. As a result, engineered reliefs or compensating features may be required in the assembly.

Providing long term durability, performance, and safety requires understanding the effect that elevated temperature has on the joint. The next step is selecting fastener material based on the information gathered from thermal analysis.

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