發(fā)布時間：2018-05-16 11:59

  本文選題：點陣夾芯 + 圓柱殼��； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：點陣夾芯結(jié)構(gòu)是指由兩層蒙皮及中間點陣桁架組成的夾層結(jié)構(gòu),具有輕質(zhì)高強、減震及隔熱性能好、比模量高、可設(shè)計性好等優(yōu)點,廣泛應(yīng)用于航空航天、船舶、建筑等諸多領(lǐng)域。本文通過建立參數(shù)與性能的關(guān)系,使用有限元分析方法討論不同點陣參數(shù)的金字塔、四面體及KAGOME結(jié)構(gòu)圓柱殼在外載作用下抗屈曲能力的差異。推導(dǎo)出了三種結(jié)構(gòu)點陣單胞相對密度及等效模量與結(jié)構(gòu)參數(shù)的關(guān)系式,并通過實驗進行了驗證。使用ANSYS workbench對點陣夾芯圓柱殼進行軸壓及外壓作用下的特征值屈曲分析,通過正交試驗探求圓柱殼蒙皮厚度、單胞數(shù)量及桿件粗細(xì)對其結(jié)構(gòu)整體抗屈曲能力的影響情況。在軸壓及外壓作用下夾芯圓柱殼的臨界屈曲載荷與三種結(jié)構(gòu)參數(shù)均成正相關(guān),軸壓作用下,圓柱殼的蒙皮厚度為影響其抗屈曲能力及承壓效率的主要因素,芯子的作用十分微弱,三種點陣結(jié)構(gòu)的抗屈曲能力差別不大,蒙皮厚度為3mm的圓柱殼抗屈曲能力明顯強于蒙皮厚度為1mm和2mm時。外壓作用下,圓柱殼蒙皮厚度的影響依然可觀,但此時單胞數(shù)量及桿粗的影響也不容忽視,點陣單胞中桿件與蒙皮夾角為45°時,夾芯單胞擁有最高的等效模量,三種結(jié)構(gòu)中,四面體結(jié)構(gòu)擁有最佳的抗外壓屈曲性能,點陣參數(shù)為蒙皮厚度3mm,單胞數(shù)量200個,桿粗4mm的夾芯圓柱殼臨界載荷及承壓效率最高。單胞數(shù)量為20×10,桿粗2mm的四面體點陣夾芯圓柱殼在蒙皮厚度大于3mm時,承壓效率開始下降。在熱載荷下,熱屈曲的部位為熱量集中最明顯的外蒙皮,所以增多桿件數(shù)量或加粗桿件等一些利于換熱的手段都會有效增強結(jié)構(gòu)的抗熱屈曲性能,相對的會減弱夾芯圓柱殼的隔熱能力,影響結(jié)構(gòu)抵抗熱屈曲能力的主要參數(shù)為單胞數(shù)量,其次為桿粗,最后是蒙皮厚度。同時四面體結(jié)構(gòu)的隔熱能力最好,而KAGOME結(jié)構(gòu)擁有最好的抗熱屈曲性能。在熱力耦合分析中,外壓、軸壓及熱載荷等外載作用強度方差分析的F比分別為14.255、2.158、1.547,外壓的作用最容易使圓柱殼發(fā)生屈曲,而熱載荷及軸壓的作用強度較低。
[Abstract]:Lattice sandwich structure is a sandwich structure composed of two layers of skin and intermediate lattice truss. It has the advantages of light weight and high strength, good shock absorption and heat insulation, high specific modulus, good designability and so on. It is widely used in aerospace and ship. Architecture and many other fields. In this paper, by establishing the relationship between parameters and properties, the difference of buckling resistance of cylindrical shells with different lattice parameters, such as pyramid, tetrahedron and KAGOME structure under external loading, is discussed by using finite element analysis method. The relationship between the relative cell density and equivalent modulus of three kinds of lattice cells and structural parameters is derived and verified by experiments. The eigenvalue buckling analysis of lattice sandwich cylindrical shells under axial and external pressure was carried out by using ANSYS workbench. The effects of skin thickness, cell number and rod thickness on the overall buckling resistance of cylindrical shells were investigated by orthogonal test. The critical buckling load of the sandwich cylindrical shell under axial and external pressure is positively correlated with the three structural parameters. Under axial compression, the skin thickness of the cylindrical shell is the main factor affecting its buckling resistance and compression efficiency. The effect of core is very weak, and the buckling ability of the three lattice structures is not different. The buckling ability of cylindrical shells with 3mm thickness is better than that with 1mm and 2mm. The effect of external pressure on the thickness of shell skin is still considerable, but the effect of cell number and rod thickness can not be ignored. When the angle between rod and skin in lattice cell is 45 擄, the core cell has the highest equivalent modulus. The tetrahedron structure has the best buckling performance under external compression. The lattice parameters are skin thickness of 3 mm, the number of unit cells 200, and the maximum critical load and compression efficiency of the sandwich cylindrical shell with thick rod 4mm. The pressure efficiency of tetrahedron lattice sandwich cylindrical shell with thick 2mm rod is 20 脳 10 when the thickness of the shell is larger than that of 3mm. Under the thermal load, the thermal buckling is located on the outer skin, which has the most obvious heat concentration. Therefore, increasing the number of bars or thickening the rods and other means conducive to heat transfer will effectively enhance the thermal buckling performance of the structure. The heat insulation ability of the sandwich cylindrical shell will be weakened relatively, and the main parameter affecting the thermal buckling resistance of the structure is the number of unit cells, the second is the rod thickness, and the last is the thickness of the skin. At the same time, tetrahedron structure has the best thermal stability, while KAGOME structure has the best thermal buckling performance. In thermodynamic coupling analysis, the F ratio of external load strength analysis of variance analysis of external pressure, axial pressure and thermal load is 14.255 / 2.1581.547, respectively. The effect of external pressure is the most likely to cause buckling of cylindrical shell, but the effect of thermal load and axial pressure is relatively low.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB303

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