Material Analysis
11 조회수
GPPS Internal Stress Delayed Cracking
문제 현상
The product cracks by itself about two days after molding and cannot be found during shipment inspection.
원인 분석
Molding internal stress is slowly released over time, and cracking occurs when the total stress exceeds the material strength; increased internal stress, increased external stress or decreased material strength are the three elements.
해결 방법
①Use polarizers to check the stress and orientation state of transparent parts; ②do heat distortion tests to evaluate stress levels; ③optimize molding conditions to reduce internal stress; ④avoid overheating and excessive regrind to protect strength.
핵심 요약
The troubleshooting framework for delayed cracking is the three elements of internal stress, external stress and strength; polarization and heat distortion tests are two practical stress detection methods.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!