Plasticity L-Angle

Metal brackets are widely used in furniture. In Figure 1, an L- angle is explicitly shown. When exceeding the so called yield value as by high pressure to a limb and can not be returned to the original shape, the component, it deforms plastically. 
Figure 2 Shows the deformations at the angle and in figure 3 the permanent plastically strain can be seen .

Fig.1: Model of a L-Angle

Fig.2: Deformations
Fig.3: Permanent plastically strain