Fracture Toughness I by Carl Ziegler

Fracture Toughness I Presented by Carl Ziegler Stork Testing and Metallurgical Consulting Houston, TX

Energy ,[object Object],[object Object]

Energy (ii) ,[object Object],[object Object],[object Object]

Griffith’s Crack Theory ,[object Object],[object Object],[object Object],[object Object]

Testing ,[object Object],[object Object],[object Object],[object Object],[object Object]

Results ,[object Object],[object Object]

Explanation ,[object Object],[object Object],[object Object]

Griffith’s Crack Theory (ii) ,[object Object],[object Object],[object Object]

Irwin's modification of Griffith's energy relation ,[object Object],[object Object]

Fracture Toughness Part II: How it’s used

How it’s used ,[object Object],[object Object],[object Object]

Theory Know any 2, calculate the 3rd Defect size Loading Fracture Toughness

How it’s used (ii) ,[object Object],[object Object],[object Object],[object Object]

From a Known Toughness ,[object Object],[object Object],[object Object]

For Known Stress Conditions ,[object Object],[object Object],[object Object]

From a Known Defect Size ,[object Object],[object Object],[object Object]

Fracture Toughness Part III Specifications

Fracture Mechanics Specifications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],There are a multitude of specifications in use for Fracture Toughness testing covering structural steels, aluminum alloys, ceramics etc.

Specifications Used ,[object Object],[object Object],[object Object],[object Object]

Specifications Used ,[object Object],[object Object],[object Object],[object Object],[object Object]

Fracture Toughness Part IV What affects toughness

Plane Strain and Plain Stress ,[object Object],[object Object]

Plane Strain ,[object Object],[object Object],[object Object]

Plane Stress ,[object Object],[object Object],[object Object]

The Effect of Thickness ,[object Object],F r a c t u r e T o u g h n e s s Kc Thickness K 1C Plane Stress Plane Strain Mixed Mode

The Effect of Thickness ,[object Object]

The Effect of Yield ,[object Object]

The Effect of Temperature ,[object Object]

The Effect of Temperature F r a c t u r e T o u g h n e s s T r a n s i t i o n T e m p e r a t u r e Brittle Fracture Ductile Failure Temperature

The Effect of Loading Rate ,[object Object]

The Effect of Environment ,[object Object]

Testing Control ,[object Object],[object Object],[object Object],[object Object]

Fracture Toughness Part V Testing

Testing: Sample Size! ,[object Object],[object Object]

Testing: Sample Size! (ii) ,[object Object],[object Object],[object Object]

Fracture Mechanics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Fracture Toughness Part VI Other tests

Other Fracture Mechanics Tests ,[object Object]

Other Tests (i) ,[object Object],[object Object]

Other Tests (ii) ,[object Object],[object Object],[object Object]

Other Tests (iii) ,[object Object],[object Object],[object Object],[object Object]

Other Tests (iv) ,[object Object],[object Object]

[object Object],[object Object]

Part II to be continued ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Fracture Toughness I by Carl Ziegler

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