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针对碳纤维增强树脂基(Carbon Fiber Reinforced Plastic,CFRP)复合材料层板相控阵超声检测中的声场开展了建模仿真研究。基于CIVA仿真平台分别建立了CFRP和各向同性材料的平板模型,计算了不同偏转角度下相控阵超声波束在两种材料中的声传播路径和声压分布,发现CFRP材料的各向异性和多层结构使倾斜入射的声束传播路径出现扭折,较各向同性材料聚焦效果差,声压幅值降低。在此基础上,对相控阵超声的聚焦法则进行了优化,并对优化前后的声场进行比较,发现聚焦法则优化后声线汇聚于预设焦点位置,聚焦效果得以提高,但声压幅值改善较小。
A simulation study of the sound field in phased array ultrasonic testing of Carbon Fiber Reinforced Plastic (CFRP) composite laminates was carried out. Based on the CIVA simulation platform, the plate model of CFRP and isotropic materials was established respectively. The acoustic propagation path and sound pressure distribution of the phased array ultrasonic beam under different deflection angles were calculated. The anisotropy of the CFRP material and Multi-layer structure of the oblique incidence of beam path distortion occurs kink, than the isotropic material focusing effect is poor, the sound pressure amplitude decreases. On this basis, the focusing principle of phased array ultrasound is optimized, and the sound field before and after optimization is compared. It is found that the focusing principle optimizes that the sound rays converge to the preset focus position, and the focusing effect is improved. However, the sound pressure amplitude Improve less.