K1-intro

INTRODUKSI ANALISA

KERUSAKAN(Introduction to Failure Analyses)

Departemen Metalurgi

Fakultas Teknik Universitas Indonesia

Dr. Ir. Winarto, M.Sc.

ANALISA KERUSAKAN (FA)

DEFINISI KERUSAKAN (FAILURE)

Ketidak-mampuan suatu komponen untuk dapat

berfungsi sebagaimana mestinya. Perpatahan

(fracture) tidak perlu harus terjadi.


20cm-crack

20cm-crack


DIFINISI KERUSAKAN

Kondisi Umum:

1. Jika tidak dapat dioperasikan (dijalankan)

2. Masih dpt beroperasi, tetapi tidak berfungsi

semestinya

3. Kerusakan serius atau tidak aman untuk

digunakan


Penyebab Kerusakan Material


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.

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.

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).


EQUATION FOR SUCCESSFUL FAILURE

ANALYSIS

Proper background information

+

correct analyses and tests

+

Thorough knowledge of materials behaviour

and processing

+

Pertinent experience

_________________________

Correct Analysis




Dimana Lokasi yg umum

terjadinya kerusakan pada

sepatu tsb ?

Berikan analisa (alasan)

kasus tsb secara logis

menurut saudara !

- Lokasi dimana ?

- Penyebabnya apa ?

- Kesimpulan

- Rekomendasi (saran)



KESIMPULAN

Analisa Kegagalan Sabjek yang Kompleks ,

sebab akan meliputi area dari:

1. Fisika, Kimia, Metalurgi, elektro-kimia

2. Proses Manufaktur

3. Stress analysis, Design Analysis

4. Fracture Mechanics, dll

“To be expertise in FA” “individually near

impossible”, sehingga perlu “Team of Experts”


Home Works

1. Jelaskan apa yang dimaksud dengan

“kerusakan” secara umum!

2. Sebutkan beberapa penyebab kerusakan yang

umum terjadi pada suatu material teknik!

3. Buatlah analisa kerusakan pada “jam tangan”

saudara yang biasa dipakai sehari-hari.

4. Pelajaran apa yang diperoleh dari teknik

kerusakan (engineering failures)?

K1-intro

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