The design of a stress relief laboratory involves creating an environment where materials, such as metals or plastics, can be heated and then slowly cooled to reduce internal stresses. This process, known as stress relief or annealing, is crucial for improving the material's mechanical properties and reducing the risk of cracking or deformation. The lab should be equipped with appropriate heating equipment, controlled cooling systems, and safety measures. Additionally, it must adhere to industry standards and regulations for material testing and processing.