Relation between Mechanical Properties and Twist Angle

2 Relation between Mechanical Properties and Twist Angle 

To validate the two-dimensional off-axis reduced stiffiiess described in Section 10.1.3.1, Nakamura et al. [6] fabricated ramie twisted yam-reinforced biodegradable resin matrix composites through a compression molding method. According to this study, the single yam used was a ramie single yam (No. 5, supplied 

Matrix type Yam type Volume fraction %) Young s modulus (CPa) Tensile strength (MPa) Fracture strain [%) (CPa) a/Vf (MPa) 

Elastic constants, Tj, E2, and used in the calculation were obtained from the tensile test of SY composites along 0° and 90° directions. Shear modulus Gjj was estimated through the following equation  

the Young s modulus of a PLA composite was calculated using = 1.87 in the same way as that of CPR composites. The elastic constants used are listed in 

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