Interpretations of fracture toughness characteristics, as measured by various test procedures, are presented for structural aluminum alloys. Quantitative definitions of the significance of engineering fracture toughness tests are provided by extension of analytical procedures evolved from fracture mechanics theory. The procedural simplicity of the engineering tests, coupled with the analytical capabilities of fracture mechanics theory, provides for a significant advancement in fracture-safe design procedures for aluminum alloys covering the full range of yield strength.
The interpretative procedures are evolved from correlations of KIc with the Dynamic Tear (DT) and Charpy V-notch test. An Optimum Material Trend Line (OMTL) diagram is developed which summarizes all the DT fracture toughness data and is additionally indexed according to the KIc and Cv correlation plots.
Iso-flaw depth lines based on flaw size-stress level calculations for fracture of 1- and 3-in. thick sections are then placed in overlay on the OMTL diagram. The KIc/σys Ratio Analysis Diagram (RAD) emerges. The RAD provides for simplified, general engineering interpretation of flaw size-stress conditions for fracture. The general fracture toughness characteristics of different aluminum alloy families are simply defined by zones encompassing all the fracture toughness data and their position relative to the KIc/σys ratio lines.
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| Number of Pages : | 22 |
| Published : | 1969 |
