Plate in tension-through-thickness centre crack Calculate: ΚΙ Critical crack length Material properties: Critical stress OKIC KIC 31.33 MPa Vm Geometry dimensions: Width (2W): 20.000 mm Crack length (2a): 0.100 mm Y: 1.00 Loading: Stress: 2500.00 MPa K₁: 31.33 MPa Vm Reserve factor on the load: Show Y-calibration plot 1.00 plan view 2a 2W section through the crack plane B 2a σ = 225P Pa B
Note: for tackling parts of this question, you will need to use the K-calculator; i have provided a screenshot of the K calculator and i am inly looking for input vales for this.
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A new grade of steel with enhanced corrosion resistance is proposed for use in the nuclear industry; however, little is known about the fracture toughness and an engineer is asked to investigate. Bend samples are fatigue cracked and then loaded to failure. The engineer tested three samples and the results are summarised below.
| Sample | W (mm) | B (mm) | a (mm) | Load at failure (kN) |
|---|---|---|---|---|
| 1 | 20 | 5 | 9.8 | 2.3 |
| 2 | 20 | 10 | 9.4 | 4.4 |
| 3 | 20 | 20 | 10.1 | 8.6 |
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For the geometry used, the stress at failure is calculated from the equation added below.
where P is in newtons and B is in metres. (Note that this is an empirical formula so the units do not balance.)
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i.Use the ‘Beam in pure bending - through-thickness edge crack’ geometry in the K-calculator to calculate the value of K at failure for the three samples.
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