Determination of transverse flexural and shear moduli of chopped carbon fiber tape-reinforced thermoplastic by vibration
Determination of transverse flexural and shear moduli of chopped carbon fiber tape-reinforced thermoplastic by vibration
复制标题
振动法测定短切碳纤维带增强热塑性塑料的横向弯曲和剪切模量
DOI：
10.1177/0021998317707815
复制
发表时间：
2017
影响因子：
2.9
通讯作者：
Isamu Ohsawa
中科院分区：
文献类型：
--
作者：
Xiuqi Lyu;Jun Takahashi;Yi Wan;Isamu Ohsawa
短切碳纤维带增强热塑性材料是专门为大批量生产轻型汽车而开发的。碳纤维带增强热塑性材料具有优异的设计加工性和柔韧性，通过在平面内压缩大量随机取向的预浸渍单向带来制造。因此，碳纤维带增强热塑性材料呈现横向各向同性性质。碳纤维布加固热塑性梁沿着厚度方向的横向剪切效应对其弯曲变形有显著影响。在此基础上，提出了结合振动频率的梁理论来确定横向弯曲和剪切模量。同时，采用最小二乘准则对碳纤维布加固热塑性梁的前7阶固有频率进行拟合，最终确定了碳纤维布加固热塑性梁的横向弯曲和剪切模量。此外，给出了三点弯曲试验和Euler-Bernoulli模型的建议厚长比。
Chopped carbon fiber tape-reinforced thermoplastic material is specifically developed for the high-volume production of lightweight automobiles. With excellent design processability and flexibility, the carbon fiber tape-reinforced thermoplastic material is manufactured by compressing large amounts of randomly oriented, pre-impregnated unidirectional tapes in a plane. Therefore, the carbon fiber tape-reinforced thermoplastic material presents transversely isotropic properties. Transverse shear effect along the thickness direction of carbon fiber tape-reinforced thermoplastic beam has a distinct influence on its flexural deformation. Accordingly, the Timoshenko beam theory combined with vibration frequencies was proposed to determine the set of transverse flexural and shear moduli. Meanwhile, the transverse flexural and shear moduli of carbon fiber tape-reinforced thermoplastic beam were finally determined by fitting all the first seven measured and calculated eigenfrequencies with the least squares criterion. In addition, the suggested thickness to length ratio for the 3-point bending test and Euler–Bernoulli model was given.