基于红外热像技术的缺陷复合材料损伤演化研究

Study of Damage Evolution of Composite Material with Defects by infrared Thermography

对分层缺陷复合材料进行静拉伸实验,采用红外热像仪监测了试件表面的温度变化,研究了整个过程中试件温度变化的规律、损伤演化过程、热耗散与损伤过程的关系。结果表明,试件表面的温度先线性下降,后持续升高;当试件温度下降到最低点时对应的应力值是试件屈服的极限值;分层缺陷处最先出现热源点,随着时间的变化,热源范围越来越大;有分层缺陷的复合材料的热耗散因子为55%。红外热像技术能够监测缺陷复合材料的损伤,有利于复合材料的工程应用研究。

The static tensile test is carried out for the composite materials with delamination defects.The surface temperature variation of specimen is monitored by infrared thermography. The temperature variation of the specimen in the whole process, the damage evolution process and the relationship between heat dissipation and damage process are studied. The results show that the surface temperature of the specimen first decreases linearly and then increases continuously. When the temperature drops to the lowest point, the corresponding stress value is the yield limit of the specimen. The heat source point first occurs in the composite with delamination defects. As time goes on, the heat source area is becoming wider and wider. The thermal dissipation factor of the composite with delamination defects is 55%. The infrared thermography technology could monitor the damage of composite materials with defects. It is beneficial to the research on the engineering application of composite materials.