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Why ABS Plastic Molded Products Crack

Why ABS Plastic Molded Products Crack

2024-04-12 11:03:01

The cracking issue of ABS resin molded products can be classified into the following three representative types based on visual inspection of the fracture surface. Its failure modes provide important information for investigating the causes and implementing measures to solve the problem.

1.Fracture surface whitening → Ductile fracture

  • Ductile fracture surfaces exhibit undulations and irregularities, characteristic of a fibrous mode of fracture.
  • Ductile fractures occur only when subjected to forces greater than the strength of the raw material, meaning they are solely caused by excessive external forces.


2.Fracture surface without whitening → Brittle fracture
  • The characteristic feature of brittle fracture is stress corrosion cracking. The fracture surface exhibits no undulations and remains smooth.
  • Brittle fractures occur due to a combination of forces (stress) smaller than the strength of the material being used and various factors (such as chemicals, temperature, coating, electroplating, application of external forces, etc.).
 
3.Fracture surface displaying shell patterns → Fatigue failure
  • It exhibits the characteristic shell patterns of fatigue fractures.

Types of cracking, simple causes, and solutions

Types of destruction Cause of destruction Specialties and solutions
Ductile damage Simply due to excessive external force The fracture (crack) turns white and removes excessive external force
Types of brittle failure Cause of destruction Specialties and solutions
Chemical stress cracking Drugs and Stress In obvious cases, the fracture is a mirror surface.
·Changes in drugs and raw materials 
Fatigue damage Methods of applying external force and repeated load The fracture shows a shell pattern. Use of fatigue-resistant materials
Damage to painted products External force and poor physical properties of the coating (impact, extension) ·Exclude external forces
Damage to electroplated products External force and poor physical properties of the electroplated film (impact, extension) ·Exclude external forces
Destruction due to physical property degradation (deterioration) External force and physical properties of molded products decrease (deterioration) ·Eliminate causes of mixing ·Use weather-resistant materials ·Use heat-resistant materials·Adopt appropriate forming conditions  
Destruction of materials with poor impact resistance External force and low strength of molded products ·Use impact-resistant materials
Destruction under low temperature conditions External force and reduced strength of molded products ·Use impact-resistant materials
Creep failure Bear long-term load ·Reduce stress ·Increase section coefficient ·Reduce initial deformation (load) 

 

 

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