How do temperature fluctuations affect the structural integrity of aluminum outdoor trash cans?

Temperature fluctuations significantly affect the structural integrity of aluminum outdoor trash cans through repeated thermal expansion and contraction. Aluminum has a high coefficient of thermal expansion, meaning it expands noticeably when heated and contracts when cooled. During hot days, the metal expands, potentially causing stress at welded joints and seams. Conversely, cold nights cause contraction, which can lead to metal fatigue over time. This cyclic loading weakens the material, making it more susceptible to cracks, especially at stress points like handles or wheel mounts. Additionally, extreme cold can reduce aluminum's ductility, increasing the risk of brittle fracture upon impact. Prolonged exposure to temperature swings may also compromise protective coatings, accelerating corrosion. To mitigate these effects, manufacturers often use alloyed aluminum and reinforced designs, while proper placement in shaded areas can reduce thermal stress.