Material Analysis
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COC Cold Resistance Impact Failure
Fenómeno del problema
COC products fail by brittle fracture when used in low-temperature environments; snap-fit structures that pass room-temperature tests show a surge in fracture rate during cold chain transportation.
Análisis de la causa
Below the glass transition of COC, molecular chain segments are frozen, and impact toughness deteriorates significantly with decreasing temperature; notch sensitivity is amplified at low temperatures; low-temperature brittle fracture has no warning.
Solución
①Select low-temperature resistant modified grades for low-temperature applications; ②eliminate notch stress concentration in the structure; ③conduct impact verification at the lowest use temperature; ④design cushioning protection in packaging.
Conclusión clave
COC low-temperature brittleness is a boundary condition that must be evaluated in material selection; cold chain applications require special verification; room-temperature data cannot be extrapolated to low-temperature conditions.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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