丝束变角度层合板屈曲性能的有限元分析

Finite element analysis on the buckling property of variable angle tow laminates

  • 摘要: 连续丝束剪切(CTS)作为一种新的丝束变角度(VAT)铺放技术,能克服传统的自动铺丝技术(AFP)的诸多缺陷。鉴于此,分别采用CTS和AFP这2种技术铺设而成的VAF层合板为研究对象,对其屈曲性能进行了有限元分析;在施加相同端部轴向位移的条件下,以铺层顺序90±<0|75>4s为例,对比分析了2种层合板的内力分布;最后,讨论了丝束最小转弯半径对2种铺放技术的影响。结果表明:CTS层合板因其变厚度的特性,其屈曲性能优于AFP层合板;与AFP技术受制于最小转弯半径,导致其在小尺寸结构中的应用受到限制相比,CTS技术适用于各种尺寸的层合板。

     

    Abstract: As a new kind of variable angle tow (VAT) placement technology, continuous tow shearing (CTS) could significantly overcome process-induced defects in the traditional automated fiber placement (AFP). Taking the VAT laminates made by CTS and AFP respectively as research objects, the finite element analysis of their buckling property were carried out. Under the axial end shortening, based on the stack sequence90±<0|75>4s, the stress resultant distribution of CTS laminate and AFP laminate were compared. After that, the effect of minimum turning radius on these two placement technologies was demonstrated. The result shows that CTS laminate performs better than AFP laminate on buckling for its variable thickness character, and AFP's usage is restricted when the laminate dimension is small for the constraint of minimum turning radius, while CTS is suitable for all kinds of dimensions.

     

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