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K-cor夹层结构是应用Z-pin技术增强的一种新型高性能夹层结构,本文研究了Z-pin不同植入密度对K-cor夹层结构试样吸湿特性的影响规律,在此基础上对不同Z-pin植入参数对试样湿热前后三点弯曲性能和压缩性能的影响规律进行了深入研究。研究结果表明:夹层结构中Z-pin的植入能提高试样的尺寸稳定性,且不会对其吸湿率造成明显影响;Z-pin植入密度的增加能明显提高湿热前后试样三点弯曲强度和压缩强度,且具有较高的强度保持率,Z-pin密度为12mm×12 mm的K-cor夹层结构湿热处理试样的三点弯曲强度比未湿热处理空白试样的要高11.1%,8 mm×8mm湿热处理K-cor试样的芯部压缩强度比未湿热处理空白夹层结构试样要高17.5%,体现出K-cor夹层结构优异的抗湿热性能;而Z-pin植入角度的减小能明显提高试样湿热处理前后的压缩强度,0°植入K-cor试样湿热处理后的芯部压缩强度与40°植入K-cor试样未湿热处理的基本相同,但植入角度对三点弯曲强度影响较小。
K-cor sandwich structure is a new type of high-performance sandwich structure reinforced by Z-pin technology. In this paper, the influence of different implant densities of Z-pin on the hygroscopic properties of K-cor sandwich specimens is studied. Based on this, The effects of different Z-pin implant parameters on the bending and compressive properties of the sample before and after hot-humidification were investigated. The results show that the Z-pin implantation in sandwich structure can improve the dimensional stability of the sample without any significant effect on the moisture absorption rate. The increase of Z-pin implantation density can significantly improve the wettability of the sample at three points Flexural strength and compressive strength with high strength retention. Three-point bending strength of K-cor sandwich wet-heat treated specimens with Z-pin density of 12 mm × 12 mm was 11.1 higher than that of blank specimens without wet heat treatment The core compressive strength of the K-cor samples with% 8mm × 8mm wet-heat treatment is 17.5% higher than that of the blank samples without damp heat treatment, which shows the excellent wet-heat resistance of the K-cor sandwich structure. The decrease of entrance angle can obviously improve the compressive strength of specimens before and after wet heat treatment. The compressive strength of core after wet heat treatment of K-cor specimens implanted at 0 ° is basically the same as that of non-wet heat treatment of K-cor specimens implanted at 40 ° , But the implantation angle has little effect on the three-point bending strength.