The presence of internal stresses in extruded tubing can significantly affect its performance in various ways:

  1. Mechanical Properties: Internal stresses can lead to a decrease in mechanical properties such as tensile strength, elongation at break, and impact resistance. These stresses may cause the tubing to become brittle or prone to premature failure under mechanical loading.
  2. Dimensional Stability: Internal stresses can cause dimensional instability in extruded tubing, leading to changes in size and shape over time. This can result in difficulties in assembly or fitting the tubing into specific applications, as well as potential leakage or improper sealing.
  3. Cracking and Delamination: High levels of internal stresses can induce cracking or delamination within the tubing material. These defects can compromise the integrity of the tubing, leading to leaks, reduced durability, or complete failure.
  4. Processing Difficulty: Internal stresses may make extruded tubing more challenging to process during manufacturing operations such as cutting, bending, or joining. This can result in increased scrap rates, production downtime, and higher manufacturing costs.
  5. Residual Strain: Residual stresses remaining in the tubing after extrusion can contribute to long-term deformation or creep under load. This can lead to dimensional changes or distortion over time, affecting the functionality and performance of the tubing.
  6. Surface Quality: Internal stresses can also affect the surface quality of extruded tubing, leading to surface defects such as waviness, roughness, or unevenness. This can impact the appearance, aesthetics, and surface finish requirements of the tubing.
  7. Material Degradation: Internal stresses may accelerate material degradation processes such as aging, oxidation, or chemical degradation. This can result in a reduction in the overall service life of the tubing and may require more frequent replacement or maintenance.

Overall, the presence of internal stresses in extruded tubing can have detrimental effects on its performance, durability, dimensional stability, processing characteristics, and surface quality. Therefore, it is essential to minimize or control internal stresses during the manufacturing process to ensure that the tubing meets the desired specifications and performance requirements for its intended application.