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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