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A Delamination Propagation Model for Fiber Reinforced Laminated Composite Materials

机译：纤维增强层压复合材料的分层传播模型

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摘要

The employment of composite materials in the aerospace industry has been gradually considered due to the fundamental lightweight and strength characteristics that this type of materials has. The science material and technological progress reached matched perfectly with the requirements for high-performance materials in aircraft and aerospace structures; thus, the development of primary structure elements applying composite materials became something very convenient. It is extremely important to pay attention to the failure modes that influence composite materials performances, since these failures lead to a loss of stiffness and strength of the laminate. Delamination is a failure mode present in most of the damaged structures and can be ruinous, considering that the evolution of interlaminar defects can carry the structure to a total failure followed by its collapse. The present work aims at the development of a delamination propagation model to estimate a progressive interlaminar delamination failure in laminated composite materials and to allow the prediction of material's degradation due to delamination phenomenon. Experimental data, available at literature, was considered to determine some model parameters, like the strain energy release rate, using GFRPs laminated composites. This new delamination propagation model was implemented as subroutines in FORTRAN language (UMAT-User Material Subroutine) with formulations based on the Fracture Mechanics and Continuum Damage Mechanics. Finally, the UMAT subroutine was complemented with an intralaminar model and compiled beside the commercial Finite Element (FE) software ABAQUS (TM).
机译：由于这类材料具有基本的轻质和强度特性，因此已逐渐考虑在航空航天工业中使用复合材料。科学材料和技术进步达到了对飞机和航空航天结构高性能材料的要求；因此，开发使用复合材料的主要结构元件变得非常方便。注意影响复合材料性能的破坏模式非常重要，因为这些破坏会导致层压板的刚度和强度损失。考虑到层间缺陷的演变会导致结构完全失效，然后塌陷，分层是大多数受损结构中的一种失效模式，并且可能是破坏性的。本工作旨在开发分层传播模型，以估计层压复合材料中的渐进层间分层破坏，并允许预测由于分层现象引起的材料降解。考虑使用文献中提供的实验数据来确定某些模型参数，例如使用GFRP层压复合材料的应变能释放率。这种新的分层传播模型以FORTRAN语言的子例程（UMAT用户材料子例程）的形式实现，并具有基于断裂力学和连续体损伤力学的公式。最后，将UMAT子例程添加了层内模型，并在商业有限元（FE）软件ABAQUS（TM）旁边进行了编译。

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  • 来源
    《Mathematical Problems in Engineering》 |2018年第7期|1861268.1-1861268.9|共9页
  • 作者

    Aveiga David; Ribeiro Marcelo L.;

  • 作者单位

    Univ Sao Paulo, Sao Carlos Sch Engn, Aeronaut Engn Dept, BR-13563120 Sao Carlos, SP, Brazil;

    Univ Sao Paulo, Sao Carlos Sch Engn, Aeronaut Engn Dept, BR-13563120 Sao Carlos, SP, Brazil;

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