Question

Question 6 (sheet metal forming) (a). What is a Forming Limit Diagram (FLD)? (b). Describe how to construct a Forming Limit Diagram (FLD) (c). For the FLD diagrams shown below (Figure 3): (i) material A minor axis of -20 and major axis of 40, (ii) material B minor axis of 10 and major axis of 70, Indicate the position of materials A and B on the diagram, and describe which material has better formability. Justify your answer! [2 marks] [2 marks] [4 marks] Total 8 marks Major axis failure 8아 4아 safe 40 -20 20 - 40 Minor axis Figure 3. FLD diagram

(a). What is a Forming Limit Diagram (FLD)?

(b). Describe how to construct a Forming Limit Diagram (FLD)

(c). For the FLD diagrams shown below (Figure 3): (i) material A = minor axis of -20 and major axis of 40, (ii) material B = minor axis of 10 and major axis of 70, Indicate the position of materials A and B on the diagram, and describe which material has better formability. Justify your answer!

Answer 1

Forming limit diagram is also known as forming limit curve tells us about the forming behaviour in sheet metal forming .

To find out about the failed region we have to performs tests .

By placing a circular mark before deformation , after deformation a ellipse is formed out of this mark , and then we measure this ellipse .By repeating the mechanical test to generate a range of stress states, the formability limit diagram can be generated as a line at which failure is onset