Molds & Tooling
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ABS brittle cracking——product structure stress concentration
Fenómeno do problema
The product cracks in batches at sharp corners, notches, or sudden wall thickness changes, with fixed positions and strong repeatability, directly related to the structural design.
Análise das causas
The structural design has sharp corners, notches, or areas with large thickness differences, stress is concentrated during molding and cannot be effectively released, and cracking occurs along the sharp corners during use or after demolding; too thin wall thickness or too much hollowing leads to insufficient strength and uneven stress distribution, aggravating brittle cracking.
Solução
①Change sharp corners and notches to rounded corners, minimum corner radius 0.5mm; ②make the wall thickness as uniform as possible, set gradual transition sections for thick-thin transitions; ③the wall thickness should not be too thin (ABS generally not less than 0.8mm); ④optimize the hollow design, add reinforcing ribs when necessary; ⑤structurally strengthen the load-bearing areas.
Conclusão principal
A sharp corner in the ABS structure is the starting point of a crack: rounded corners, uniform wall thickness, and reasonable reinforcing ribs are the three structural means to prevent brittleness; many 'material brittleness' cases are actually mines buried by the design, and must be removed from the drawing.
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