两种典型缺陷对六边形蜂窝压缩性能的影响

文摘通过数值模拟研究了孔洞和部分填充孔穴这两种典型缺陷对弹性蜂窝(橡胶)和弹塑性蜂窝(金属)的压缩性能的影响规律。结果表明,相对于分散孔洞,集中孔洞对蜂窝材料的力学性能影响更大,且它们的存在完全改变了其变形模式;而对于含填充孔穴的蜂窝材料而言,其弹性模量得到显著增强,弹性蜂窝的屈曲应力也得到增强,但弹塑性蜂窝的塑性坍塌应力则保持不变或有所下降。

Effects of Two Classical Defects on Compressive Mechanical Properties of Hexagonal Honeycombs

The influences of two classical defects on the compressive mechanical properties of honeycombs are investigated in this paper. The numerical results show that the bigger concentrated hole has more significant effects on the mechanical behavior of honeycombs than the smaller scattered holes. The bigger concentrated hole even can change the deformation mechanism of honeycombs. Furthermore, we find that a honeycomb with some filled cells has a higher Young''s modulus. At the same time, the buckling stress of a filled elastic honeycomb can be enhanced. But, the plastic collapse stress of a filled elastic-plastic honeycomb may keep unchanged or drop a little.