What happens to the elasticity of a fastener when exposed to high stress for prolonged periods?

When a fastener is exposed to high stress for prolonged periods, the elasticity of the material typically diminishes. This phenomenon occurs because the continuous application of stress can lead to various forms of deformation, including yield, creep, or fatigue.

As the fastener undergoes these stresses over time, the microscopic structure of the material may begin to change. For instance, the arrangement of atoms can be disrupted, leading to a reduction in the material's ability to return to its original shape after the load is removed. This loss of elasticity is particularly critical in mechanical applications where maintaining tight tolerances and proper fittings is essential for equipment longevity and performance.

Understanding the behavior of materials under prolonged stress conditions is vital for millwrights and other professionals working with machinery. It allows for better selection of fasteners and materials that are suitable for specific applications, ensuring that the integrity of the assembly is maintained over time.