激光-机械载荷联合作用下复合材料层合板的破坏规律分析

Damage rule analysis of composite materials laminate under the combined effects of laser and mechanical loading

为了从细观尺度研究激光-机械载荷联合作用下复合材料层合板的渐进式破坏规律,根据激光对碳纤维/环氧树脂复合材料层合板的一维烧蚀模型改进了桥联模型,并应用改进的桥联模型计算了层合板在不同激光强度、辐照时间下的渐进式拉伸破坏强度,分析了激光辐照强度、辐照时间对复合材料层合板拉伸破坏强度的影响,揭示了激光-机械载荷联合作用下复合材料层合板的细观破坏机理。算例表明:改进的桥联模型能够预测激光-机械载荷联合作用下层合板的渐进式破坏规律及其最大拉伸强度,随着激光辐照时间的增加,复合材料层合板所能承受的最大拉力逐渐减小,下降速率与激光强度相关。

The progressing damage regulation of graphite fiber/epoxy laminate under the combined effects of laser and mechanical was presented. Based on the one dimension ablation model, bridging model was improved, and the tensile strength of the laminate under various laser intensity and irradiated time was calculated. The effects of different laser intensity and irradiated time on the laminate tensile strength were analyzed. And the mesoscopic damage mechanism of the laminate under the combined effects of laser and mechanical loading was proclaimed. The results of the numerical examples show that the improved bridging model is reasonable. Moreover the tensile strength of the laser beams decreases along with the increase of the irradiated time and the rate of decrease is relative to the laser intensity.