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采用落锤法对复合材料加筋板进行了低速冲击损伤(LVI)试验,根据复合材料加筋板构型,设计了冲击支持支架,研究了支持支架的间距对冲击结果的影响;用相同的冲击能量对复合材料加筋板结构中3处典型位置进行冲击,得到不同位置的损伤形貌;分别对完好件和损伤试验件进行压缩试验,将试验结果进行对比,分析不同位置的冲击损伤对结构压缩性能的影响。试验结果表明:在相同的冲击能量下,支持支架间距越小,所造成的冲击损伤越严重;在50J冲击能量下,筋条区蒙皮处的冲击所造成的损伤不易观察,筋条间蒙皮处的冲击所造成的损伤最为明显,而筋条边缘蒙皮处的冲击可以导致筋条边缘的脱粘;冲击损伤会使加筋板屈曲载荷轻微下降,筋条间蒙皮和筋条区蒙皮冲击损伤对压缩结果影响相对较小,筋条边缘处的冲击会引起损伤处蒙皮的子层屈曲,并影响结构破坏形式,使结构压缩承载能力有较为明显的下降。
The low-speed impact damage (LVI) test was carried out on the stiffened composite panels by the drop-weight method. According to the configuration of the stiffened composite panels, the impact support was designed and the influence of the support stand spacing on the impact was studied. Impact energy on the three typical locations in the composite stiffened plate structure impact, get damage morphology at different locations; respectively intact pieces and damage test pieces for compression test, the test results were compared to analyze the different locations of the impact damage Effect of Structure Compression Performance. The experimental results show that under the same impact energy, the smaller the support bracket spacing is, the more severe the impact damage is. Under the impact energy of 50 J, the damage caused by the impact on the skin of the rib section is not easy to be observed. The damage caused by the impact of the skin is the most obvious, and the impact of the edges of the ribs can lead to the edge of the tendon off; impact damage will make the buckling load of the stiffener slightly decreased, between the ribs and ribs area The impact of skin impingement on the compression results is relatively small. The impact at the edge of tendons will cause sub-layer buckling of the damaged skin and affect the form of structural failure, resulting in a significant decrease in the compressive load carrying capacity of the structure.