Material Drying
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PA6 Creep Stress Relaxation
Fenómeno do problema
PA6 long-term load-bearing structural parts deform after a period of use, and the fastening force decreases
Análise das causas
PA6 creep is obvious, and deformation grows with time under constant load; stress relaxation under constant deformation decays the fastening force, and both temperature rise and moisture absorption accelerate creep; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solução
Select glass fiber reinforced grades for long-term load-bearing parts to reduce creep; design and check by creep modulus rather than initial modulus; metal inserts share the load; structures with periodic re-tightening use elastic compensation
Conclusão principal
PA6 long-term load-bearing design must be checked according to creep characteristics and cannot apply short-term strength; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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