A Review on Plastic Behavior of Polymer Sheets and Forming Process- Open access journals- Juniper Publishers

Juniper publishers- Academic Journal of Polymer Science

Authored by Eun Ho Lee

A Review on Plastic Behavior of Polymer Sheets and Forming Process

This paper presents a mini review about plastic behaviour of polymer sheets. The fundamental of plasticity and concept of constitutive modeling are introduced. As an application of the plastic behaviour, studies on forming process of polymer sheets are presents. Finally, the future woks are also discussed in the conclusion section.

Polymer is one of widely used material due to the great availability and low cost. For mass production, moulding and extrusion technologies have been widely employed for polymer processing in industries [1]. Recently, automotive industries are trying to reduce the weight of the vehicles for improving the fuel efficiency [2]. For the reason, they have an interest in polymer materials, and many researchers have studied mechanical behavior of polymer materials. Figure 1(a) shows an example of 1-dimensional tensile test which is the most widely used material testingmethods to obtain the material’s behavior. When a material is getting deformed, the material has aproportional relation between stress and strain within a range of strain and this proportional relation iscalled elastic modulus. This strain rage is called elastic range and the stress is called yield stress. In theelastic range, the deformed material can recover the original shape, as shown in the path A. However, if thestrain level is over the elastic limit, a permanent deformation remains on the material even though thematerial slightly recovers the strain [3,4]. This recovered strain is called elastic strain, and the permanentdeformation is called plastic strain, as shown in path B of Figure 1(a). Figure 1(b) shows general behaviors ofpolymer materials. The elastic behavior is almost the same for all the materials. However, right after theelastic limit, rigid plastic easily leads to a material failure while other materials have more margin to bedeformed. For the reason, rigid plastic material does not show plastic behavior. This break point determinesthe elongation, the ration between the deformed length and the original length until the break point. Table 1 shows a summary of the mechanical property of polymer materials [5].

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