Analisis Falla

Failure Analysis Methods
What, Why and How
MEEG 466 – Special Topics in Design Jim Glancey Spring, 2006

Failure Analysis Methods
•Every product or process has modes of failure. •An analysisof potential failures helps designers focus on and understand the impact of potential process or product risks and failures. •Several systematic methodologies have been develop to quantify the effectsand impacts of failures.

Failure Analysis Methods . . .
Why perform failure analysis? • Product Development:
• Prevent product malfunctions. • Insure product life. • Prevent safety hazardswhile using the product.

• Process Development:
–Insure product quality –Achieve process reliability –Prevent customer dissatisfaction –Prevent safety or environmental hazards

Common FailureAnalysis Techniques
• • • • • • Cause-Consequence Analysis Checklist Event Tree Analysis Failure Modes & Effects Analysis (FMEA) Failure Modes, Effects and Criticality Analysis (FMECA) Fault TreeAnalysis (FTA) • • • • • • • Hazard & Operability Analysis (HAZOP) Human Reliability Preliminary Hazard Analysis (PHA) Relative Ranking Safety Review What-If / Checklist Analysis What-If Analysis

Forthe purpose of this class, two common but fundamentally different techniques will be presented in detail: 1. Failure Modes Effects Analysis (FMEA) 2. Fault Tree Analysis

Part 1: Failure ModesEffect Analysis

Failure Modes & Effects Analysis (FMEA)
• Tabulation of equipment/components and their associated single point failure modes, consequences and safeguards. • Identification/assessmentof risk is derived from looking at each component (or machine in the case of multi-unit manufacturing). • This is commonly referred to as a bottom-up approach.
Simple Example: Car
ItemIdentification
Car Tire

Description
-Supports Weight -Traction -Cornering -Smooth Ride Holds fuel

Failure Modes
Flat

Effects
-Stranded -Loose Control

Safeguards
Spare Tire In Trunk

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