Material Analysis
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COC Cold Resistance Impact Failure
Problem Phenomenon
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.
Cause Analysis
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.
Solution
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.
Key Takeaway
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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