(1) (1) MEKANIKA PERPATAHAN & MEKANIKA PERPATAHAN & FAILURE ANALYSIS FAILURE ANALYSIS Muhammad Fitrullah Muhammad Fitrullah Teknik Metalurgi Teknik Metalurgi Fakultas Teknik Universitas Sultan Ageng Fakultas Teknik Universitas Sultan Ageng Tirtayasa Tirtayasa
(1) MEKANIKA PERPATAHAN & FAILURE ANALYSIS. Muhammad Fitrullah Teknik Metalurgi Fakultas Teknik Universitas Sultan Ageng Tirtayasa. DEFINISI KERUSAKAN (FAILURE). Ketidak-mampuan suatu komponen untuk dapat berfungsi sebagaimana mestinya. Perpatahan (fracture) tidak perlu harus terjadi. - PowerPoint PPT Presentation
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Teknik MetalurgiTeknik MetalurgiFakultas Teknik Universitas Sultan Ageng TirtayasaFakultas Teknik Universitas Sultan Ageng Tirtayasa
DEFINISI KERUSAKAN (FAILURE)
• Ketidak-mampuan suatu komponen untuk dapat berfungsi sebagaimana mestinya. Perpatahan (fracture) tidak perlu harus terjadi.
KONDISI UMUM KERUSAKAN
1. Jika tidak dapat dioperasikan (dijalankan)
2. Masih dpt beroperasi, tetapi tidak berfungsi semestinya
3. Kerusakan serius atau tidak aman untuk digunakan
Failure analysis rules
• The failure investigator has only one objective to determine the failure mechanism that caused the failure and to use that knowledge to prevent another occurrence.
• Start with and maintain an open mind. Emotion obscures objectivity and must be edged from the investigation.
• The theory, however elegant, must agree with the observed evidence, however humble.
Failure analysis rules…?
• The simplest solution is the best solution.
• Having the wrong solution is frequently much worse than having no solution.
• Major incidents are often triggered by very minor or apparently innocuous details.
Failure analysis rules…?
• Only one thing is worse than knowing you have a crack growing in a component, and that is not knowing you have a crack growing in a component.
• Cracks never get smaller, nor do they ever disappear. Either they stay the same size (invariably in a minor, insignificant, or easily repaired component), or they get bigger (usually in a critical component).
QUATION FOR SUCCESSFUL FAILURE ANALYSISProper background information
+correct analyses and tests
+Thorough knowledge of materials behaviour
and processing+
Pertinent experience______________________
Correct Analysis
Penyebab Kerusakan Material
FAKTOR KEGAGALAN
1. SALAH DISAIN :• Apakah ada stress concentration
(lubang, ulir, notch)• Apakah Dimensinya sesuai ? Lost by
wear or corrosion• Haruskah Rigid atau Flexsible like
spring?• Apakah Part / Komponen memang
didisain untuk mudah rusak atau memang untuk tahan rusak ?
FAKTOR KEGAGALAN
2. SALAH MEMILIH MATERIAL• Apakah mechanical prop. sesuai?