336 Green Composites from Natural Resources
where a is strain to failure in percent,
is increase in the distance between
reference point measured at failure and expressed in millimeters, and
is
gauge length in millimeters.
15.6.2 tensile ProPerties
Tensile testing of natural ber composites is widely used to assess their properties
and quality. Testing is an important part in the process of developing this type of
composite material. From an engineering point of view, the three most important
tensile properties are stiffness, ultimate stress, and strain to failure. These properties
are measured with relatively short gauge lengths (150–250 mm, BS EN 2747: 1998,
ASTM D 2256, ISO 2062).
To predict the tensile behavior of NFRCs, several models ...