erichsen cupping test

1. Marathwada Mitramandal’s
College of Engineering, Pune
Department of Mechanical Engineering
Subject:- Engineering Materials and
Metallurgy
Topic:- Erichsen cupping test
Course Co-ordinator :- Pavanraj S. Khade.
(Assistant Professor MMCOE, Pune)

2. Formability Testing
• Formability is defined as the ability of a
sheet material to be formed into a specific
shape or configuration.
• Formability of sheet metal is dependent
on the following parameters:
1. Strain hardening coefficient or exponent
(n)
2. Strain rate sensitivity index (SRS)
3. Plastic strain ratio (r)
4. Strain distributions:

3. Formability Testing
• Erichsen Cupping Test

4. Formability Testing
• Erichsen Cupping Test

5. Formability Testing
Radial cracks Circumferential
cracks

6. • Visual inspection of dome gives
1. Rough appearance- Large grain size
2. Radial cracks- Equal strength of sheet in all
directions
3. Circumferential cracks- Anisotropic property
of sheet
4. One direction crack- variation in ductility in
different direction

7. Formability Testing
• Erichsen Standard Chart