Molds & Tooling
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ABS brittle cracking——sharp corner and notch stress concentration
Fenómeno del problema
The product cracks in batches at sharp corners, notches, or sudden wall thickness changes.
Análisis de la causa
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.
Solución
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.
Conclusión clave
A sharp corner in the structure is the starting point of a crack.
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