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首页> 外文期刊>Construction and Building Materials >A numerical model for description of mechanical behaviour of a Functionally Graded Autoclaved Aerated Concrete created on the basis of experimental results for homogenous Autoclaved Aerated Concretes with different porosities
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A numerical model for description of mechanical behaviour of a Functionally Graded Autoclaved Aerated Concrete created on the basis of experimental results for homogenous Autoclaved Aerated Concretes with different porosities

机译：基于不同孔隙度的均质高压加气混凝土实验结果建立的描述功能梯度高压加气混凝土力学性能的数值模型

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The paper proposes a new concept for the Functionally Graded Autoclaved Concrete (FGAAC) and provides a numerical model to describe its mechanical behaviour. The model contains several material parameters describing damage growth and cracks propagation. They were assessed for the FGAAC by several laboratory tests like: 3-point bending, compact shear and modified Brazilian test done for homogeneous Autoclaved Aerated Concretes (AAC) with bulk densities in the range 400 divided by 700 kg/m(3). To achieve the goal efficient experimental procedures for the AACs testing were elaborated.The first step of this numerical model creation is description of the AAC gradual degradation and further cracks propagation in the above specified tests using XFEM approach. A good correlation with experiments was achieved. In second step the numerical model for theoretical FGAACs with using the material parameters describing damage growth in the MC was build. The mechanical behaviour of the FGAAC was analysed in virtual 3-point bending (3-PB) test. Comparison to the experimental 3-PB test for the homogeneous AACs leads to conclusion that the mechanical behaviour of the FGAAC is correctly modelled. Moreover, the proposed numerical model has potential application in civil engineering concerning designing of structural elements with build-in thermal protection. (C) 2019 Elsevier Ltd. All rights reserved.
机译：本文提出了一种功能梯度耐高温混凝土（FGAAC）的新概念，并提供了一个描述其力学性能的数值模型。该模型包含几个描述损伤增长和裂纹扩展的材料参数。通过多项实验室测试对它们的FGAAC进行了评估，例如：3点弯曲，紧凑剪切和改良的巴西测试，均质压热加气混凝土（AAC）的体积密度为400除以700 kg / m（3）。为了实现该目标，详细阐述了用于AAC测试的有效实验程序。此数值模型创建的第一步是描述使用XFEM方法在上述指定测试中AAC逐渐退化和进一步的裂纹扩展。与实验实现了良好的相关性。在第二步中，建立了使用描述MC中损伤增长的材料参数的理论FGAAC的数值模型。在虚拟3点弯曲（3-PB）测试中分析了FGAAC的机械性能。与针对均质AAC的实验3-PB测试的比较得出结论，即FGAAC的机械行为已正确建模。此外，所提出的数值模型在土木工程中具有内置热保护的结构元件设计方面具有潜在的应用价值。 （C）2019 Elsevier Ltd.保留所有权利。

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