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Design Considerations (Design Approaches (Linear Elastic Fracture…
Design Considerations
Design Approaches
Empirical
Trial-and-Error
Deterministic
"Safety Margin/Factor"
Design Stress & Material Strength
Analytical + Empirical
Calculated Max Stress + Margin
Graph Info (Fig 9)
Broad Scatter
Non-Symmetrical
Peak Strength =/ Average Strength
Probabilistic
Weibull Stats
Probability to Failure
Pros
Allow proper designing for properties closer to materials
High Material Selection Reliability
Cons
Hard to determine:
Boundaries Conditions
Peak Stresses & Stress Distribution
True Strength-Flaw Size Distribution
Linear Elastic Fracture Mechanics
Considers imperfect material with flaws
Fracture
Fracture Toughness, KIC, Flow Size
x UTS/YS
Crack Formation & Propagation
Combined
Property Limitations
Cost Considerations
Reliability Requirements