纤维复合材料的热膨胀系数  

THERMAL EXPANSION COEFFICIENT OF FIBER COMPOSITES

作　　者：王培吉[1] 范素华[1] 

机构地区：[1]山东建材学院物理系,济南250022

出　　处：《复合材料学报》2002年第3期124-126,共3页Acta Materiae Compositae Sinica

摘　　要：提出了一种利用压电光声技术测量材料热膨胀系数的实验方法 ,并测试了单向复合材料 C/ C、C/ Al的横向、纵向的热膨胀系数。根据已有的理论计算方法与实验结果对该方法的测试结果进行验证 ,证明了该检测方法的可靠性 ,进而又测量了 C/ C、C/ Al材料在任一方向上的热膨胀系数。The thermal expansion coefficients of fiber composites are studied. A method of measuring the thermal expansion coefficient by piezoelectric photoacoustic technique was proposed. An intensity-modulated Ar+ laser beam was used as the incident light. The beam was focused on a spot with the diameter of about 1 μm diameter spot and illuminated the sample surface. Using the technique, piezoelectric photoacoustic signals as functions of different frequencies were experimentally measured. The thermal expansion coefficients can be obtained by fitting the experimental data. On the other hand, the thermal expansion coefficients of one-way composite C/C and C/Al in the transverse direction and the longitudinal direction were measured. The measured results are proved to be reliable by comparing with the results obtained by use of other calculation methods and experiment methods. Thermal expansion coefficients in arbitrary directions of C/C and C/Al were given. The defects of the theoretical calculation method, which is complicated and by which the thermal expansion coefficient in arbitrary direction can not be measured, are overcome.

关 键 词：纤维复合材料 热膨胀系数 压电光声技术 测量 

分 类 号：TB33[一般工业技术—材料科学与工程]