含预裂缝复合材料缠绕圆柱壳轴压承载特性分析

发布时间：2018-01-24 08:34

本文关键词： 复合材料缠绕圆柱壳裂缝失效模式极限荷载　出处：《材料导报》2017年07期 　论文类型：期刊论文

【摘要】：为探究穿透裂缝对复合材料缠绕圆柱壳承载能力及失效模式的影响,首先开展不同壁厚含预裂缝复合材料缠绕圆柱壳轴向压缩试验。对于A系列厚壁圆柱壳,裂缝导致承载能力下降53.96%,失效模式由局部屈曲转化为裂缝扩展、脆性断裂;而B系列薄壁圆柱壳均发生局部屈曲,裂缝使承载能力下降12.59%。其次,采用有限元软件ABAQUS 6.14,基于非线性RIKS算法,建立轴压作用下含预裂缝复合材料圆柱壳极限承载能力计算模型,通过引入Hashin失效准则及损伤演化判据,预测结构渐进破坏模式及极限荷载。数值结果与试验数据吻合良好,最大误差为7.01%,验证了数值算法的可靠性。在此基础上,探讨裂缝方向、缠绕角度对含预裂缝复合材料圆柱壳极限承载的影响,可知:对于±55°螺旋铺层复合材料圆柱壳,随裂缝角度α增加,极限承载能力先升高再降低,当α=45°时,具备最大承载能力;对于含开缝角α=15°、45°、55°缠绕圆柱壳,随缠绕角θ增加,其承载能力呈先上升后下降趋势。且开缝角越小,缠绕角度对极限荷载的影响越大,当缠绕角θ=30°时,达到最大承载能力。
[Abstract]:In order to investigate the effect of penetrating cracks on the bearing capacity and failure mode of composite wound cylindrical shells, the axial compression tests of composite wound cylindrical shells with different wall thickness and pre-cracks were first carried out. The failure mode changes from local buckling to fracture propagation and brittle fracture. The local buckling of B series thin-walled cylindrical shells occurs, and the bearing capacity is reduced by 12.59m due to cracks. Secondly, the finite element software ABAQUS 6.14 is used based on nonlinear RIKS algorithm. The ultimate load-bearing capacity model of composite cylindrical shells with precrack under axial compression is established. Hashin failure criterion and damage evolution criterion are introduced. The numerical results agree well with the experimental data, and the maximum error is 7.01, which verifies the reliability of the numerical algorithm. On this basis, the crack direction is discussed. The effect of winding angle on ultimate bearing capacity of composite cylindrical shell with pre-crack shows that: for 卤55 掳spiral laminated composite cylindrical shell, with the increase of crack angle 伪, the ultimate bearing capacity first increases and then decreases. The maximum bearing capacity is obtained when 伪 -U is 45 掳; For a cylindrical shell with a crack angle of 15 掳(45 掳) and 55 掳(55 掳), the bearing capacity increases first and then decreases with the increase of angle 胃, and the smaller the angle, the greater the influence of winding angle on ultimate load. When the winding angle is 30 掳, the maximum bearing capacity is achieved.
【作者单位】：海军工程大学舰船工程系;
【基金】：国家部委基金资助项目(9140A14080914JB11044)
【分类号】：TB33
【正文快照】： 0引言缠绕复合材料圆壳结构具有比强度高、抗腐蚀性好、绝热等优异特点,被广泛应用于油气储运、航空航天、海洋结构等领域。在使用过程中,由于外载荷和工作环境等原因易产生裂缝、材料老化等缺陷和损伤,严重危害了结构的完整性和使用寿命。在轴压、内外压、疲劳等载荷作用下,

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