Molds & Tooling
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ABS brittle cracking——sharp corner and notch stress concentration
Problem Phenomenon
The product cracks in batches at sharp corners, notches, or sudden wall thickness changes.
Cause Analysis
Sharp corners and notches cause stress concentration during filling and cooling; the internal stress cannot be released, and cracking occurs along the sharp corners during use or after demolding.
Solution
①Change sharp corners to rounded corners, minimum corner radius 0.5mm; ②make the wall thickness as uniform as possible, set gradual transition sections for thick-thin transitions; ③add reinforcing ribs in the transition area when necessary.
Key Takeaway
A sharp corner in the structure is the starting point of a crack.
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