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How To Prevent Stress Cracking From The Design Of Plastic Products?
Original: | Author: Jasmine HL of DGMF | Publish Time: 2017-06-29 | 6910 Views | Share:
In the specific design of plastic products, in order to effectively disperse the internal stress, the principle should be followed: the shape of the product should be as continuous as possible, avoiding acute angles, right angles, gaps, and sudden expansion or reduction.
How To Prevent Stress Cracking From The Design Of Plastic Products?--DGMF MOLD CLAMPS CO., LTD
Shape and size of plastic products
In the specific design of plastic products, in order to effectively disperse the internal stress, the principle should be followed: the shape of the product should be as continuous as possible, avoiding acute angles, right angles, gaps, and sudden expansion or reduction.
The edges of plastic products should be designed with rounded corners, where the radius of the inner corners should be more than 70% of the thickness of the thinner of the two adjacent walls; the radius of the outer corners is determined according to the shape of the product.
For parts with large differences in wall thickness, due to different cooling speeds, cooling internal stress and orientation internal stress are liable to occur. Therefore, it should be designed as a part with a uniform wall thickness as possible. If the wall thickness must be uneven, a gradual transition in wall thickness difference should be performed.
Reasonable design of metal inserts
The thermal expansion coefficients of plastic and metal differ by 5 to 10 times. Therefore, when plastic products with metal inserts are cooled, the degree of shrinkage between the two is different. Due to the relatively large shrinkage of plastic, the metal inserts are tightly held. The inner plastic layer is subjected to compressive stress, while the outer layer is subjected to tensile stress, resulting in stress concentration.