• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Composite Structures >Modeling of the dynamic delamination of L-shaped unidirectional laminated composites
【24h】

Modeling of the dynamic delamination of L-shaped unidirectional laminated composites

机译：L形单向层压复合材料动态分层建模

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

One of the widely used geometrically complex parts in advanced commercial aircraft is the L-shaped composite. Due to the sharp curved geometry, interlaminar opening stresses are induced and delamination occurs under considerable mode-mixities in L-shaped beams. Dynamic phenomena during delamination initiation and propagation of L-shaped beams are investigated using dynamic (explicit) finite element analysis in conjunction with cohesive zone methods. The 2-D model consists of 24 plies of unidirectional CFRP laminate with an initial 1 mm crack at the center of the laminate at the bend. Loading is applied parallel to one of the arms quasi-statically. The loading type yields different traction fields and mode-mixities in the two sides of the crack in which delamination occurs under shear stress dominated loading on one crack tip and opening stress dominated loading on the other. The speed of the delamination under shear dominated loading at one side is 800 m/s and under normal stress dominated loading is 50 m/s. In addition radial compressive waves at the interface are observed. Finally, as the thickness is changed, a different failure mode is observed in which a secondary crack nucleates at the arm and propagates towards the center crack.
机译：L型复合材料是高级商用飞机中广泛使用的几何复杂零件之一。由于尖锐的弯曲几何形状，会在L形梁中以相当大的模数混合引起层间打开应力并发生分层。使用动态（显式）有限元分析结合内聚区方法，研究了L形梁分层起始和传播过程中的动态现象。二维模型由24层单向CFRP层压板组成，在弯曲处，层压板的中心有1mm的初始裂纹。准静态平行于其中一个臂施加载荷。加载类型在裂纹的两侧产生不同的牵引场和模式混合，在该裂纹中，在一个剪切尖端上的剪切应力为主载荷下，在另一端上的打开应力为主导载荷下，发生分层。在一侧，剪切为主载荷下的分层速度为800 m / s，在正应力为主载荷下的分层速度为50 m / s。另外，在界面处观察到径向压缩波。最后，随着厚度的变化，观察到不同的破坏模式，在该模式下，次生裂纹在臂部成核并向中心裂纹扩展。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号