The criteria used was to identify the stress where the parallel line to the elastic modulus line, at 0.02 strain. intersects with the stress-strain curve. For CFR samples the tensile strength at break was used.

PBT-SGF30 comprises of short chopped fiberglass fibers reinforcing polybutylene Terephthalate (Thermoplastic). The coupons were made using injection molding process and the stress-strain curve data for flow, cross and 45 deg oriented (from principal direction) direction coupon were obtained.

In this paper we analyzed the mechanical properties of a polyester composite material reinforced with glass fiber (denoted GFRP) of which were carried out two types of samples: The former contains four layers of plain fabric (GFRP-RT500) and the second type contains three layers of chopped strand mat (GFRP-MAT450).

To model the stiffness properties of a chopped fiber composite, the geometric aspect ratio of the individual fibers is essential. Therefore, an accurate understanding of the length and diameter distribution of the as manufactured composite is necessary in the prediction of the stiffness properties.

Trans-l,4-polyisoprene (TPI) shape memory polymer composites with different chopped carbon fiber mass fractions were prepared to study the effects of different chopped carbon fiber mass fractions and temperatures on the TPI shape memory polymer composites in this paper.