【摘要】：對(duì)蜂窩的代表性體積單元(RVE)研究發(fā)現(xiàn),相比于均勻化邊界條件,周期性邊界條件能更好地預(yù)測(cè)蜂窩的等效力學(xué)性能�；谥芷谛赃吔鐥l件,對(duì)自相似多級(jí)蜂窩進(jìn)行面內(nèi)不同方向的拉伸模擬,重點(diǎn)分析了蜂窩孔隙率與多級(jí)長(zhǎng)度比對(duì)拉伸性能的影響。結(jié)果表明:自相似多級(jí)蜂窩在拉伸過(guò)程中會(huì)呈現(xiàn)面內(nèi)各向異性,沿扶手椅方向拉伸時(shí),會(huì)在節(jié)點(diǎn)六邊形的水平連接邊處發(fā)生斷裂;沿鋸齒形方向拉伸時(shí),當(dāng)節(jié)點(diǎn)六邊形的邊長(zhǎng)大于壁厚和節(jié)點(diǎn)六邊形的連接斜邊的邊長(zhǎng)較長(zhǎng)的情況下,蜂窩會(huì)出現(xiàn)兩次拉伸破壞,分別在節(jié)點(diǎn)六邊形邊與節(jié)點(diǎn)六邊形的連接斜邊處,而在其他情況下,則只會(huì)在節(jié)點(diǎn)六邊形連接斜邊處發(fā)生一次破壞。并且自相似多級(jí)蜂窩隨著孔隙率或長(zhǎng)度比的增大,蜂窩拉伸強(qiáng)度呈現(xiàn)減小的趨勢(shì)。
[Abstract]:The representative volume element (RVE) of honeycomb is studied. it is found that the periodic boundary condition can predict the equivalent mechanical properties of honeycomb better than the homogenized boundary condition. Based on the periodic boundary condition, the tensile simulation of self-similar multistage honeycomb in different directions is carried out, and the effect of the ratio of porosity to multistage length on the tensile properties of the honeycomb is analyzed in detail. The results show that the self-similar multistage honeycomb will show in-plane anisotropy in the tensile process, and when stretching along the armchair direction, it will break at the horizontal joint edge of the hexagonal joint of the node. When stretching along the zigzag direction, when the side length of the joint hexagonal is larger than the wall thickness and the side length of the joint oblique edge of the node hexagonal is longer, the honeycomb will appear twice tensile failure. At the oblique edge of the connection between the hexagonal edge of the node and the hexagonal edge of the node, but in other cases, it will only be destroyed once at the oblique edge of the hexagonal connection of the node. The tensile strength of self-similar multistage honeycomb decreases with the increase of porosity or length ratio.
【作者單位】： 南昌航空大學(xué)航空制造工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(11372126)
【分類號(hào)】：TB383.4

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