Figure 2 shows a fractograph of a failed specimen 8718 15KU 100 pm Figure 2: Sca

Question

Figure 2 shows a fractograph of a failed specimen 8718 15KU 100 pm Figure 2: Scanning electron micrograph of a fracture surface a) Name the fracture in Figure 2 and state which type of fracture it represents. 4 marks b) For which type of material does this type of fracture occur and under which loading conditions? 4 marks c) Explain why the specimen fractures in this way. Sketch and describe all the relevant micro-mechanisms that lead to this type of fracture. 4 marks d) Sketch the stress-strain curve of this test, labelling appropriately the main points of the curve. 4 marks oo e) State the formula for the triariality factor T and explain the physical meaning for T0 and T Explain why triaxiality is relevant to the type of fracture in Figure 2. 4 marks

Explanation / Answer

(a) ductile 'cup and cone fracture

(b) Under uniaxial tension loading in ductile materials

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