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首页> 外文会议>RILEM Proceedings PRO 39; RILEM Symposium on Fibre-Reinforced Concretes(FRC) - BEFIB 2004 vol.1; 20040920-22; Varenna(IT) >THERMOMECHANICAL BEHAVIOUR OF A FIBRE-REINFORCED REFRACTORY CONCRETE: TESTS AND FE ANALYSIS
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THERMOMECHANICAL BEHAVIOUR OF A FIBRE-REINFORCED REFRACTORY CONCRETE: TESTS AND FE ANALYSIS

机译：纤维增强耐火混凝土的热力学行为：测试和有限元分析

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摘要

The reinforcement of refractory castables by short metallic fibres can drastically improve their thermomechanical behaviour. Such reinforced materials become new candidates for specific applications where thermomechanical solicitations are severe. This study focuses on the realisation of moulds for the superplastic forming process (SPF) either for aluminium alloys at temperatures close to 500℃ or for titanium alloys at temperatures close to 900℃. Previous works have shown that such materials can be used in such applications, but there is still insufficient knowledge concerning their thermomechanical behaviour to be allow sizing of durable moulds. In order to attain a better understanding of this behaviour, a research program is in course and is based on experiments and finite element simulations. Direct tensile tests and four points bending tests are performed in the 20-900℃ temperature range in order to constitute an experimental database. Numerical simulations with a fictitious crack model implemented in the Abaqus® software allows to understand the interest of the fibre reinforcement in concrete. Comparison between experimental data and numerical simulation shows that the influence of the reinforcement on the softening curve is decisive during a structural design and should be taken into account precisely to size SPF moulds.
机译：短金属纤维增强耐火浇注料可以大大改善其热机械性能。这样的增强材料成为热机械征服严重的特定应用的新候选者。这项研究的重点是用于超塑性成形工艺（SPF）的模具的实现，该模具用于铝合金在接近500℃的温度下或钛合金在接近900℃的温度下。先前的工作表明，此类材料可以用于此类应用中，但是关于其热机械性能的知识仍然不足，无法确定耐用模具的尺寸。为了更好地理解这种行为，目前正在研究计划，该计划基于实验和有限元模拟。在20-900℃的温度范围内进行直接拉伸试验和四点弯曲试验，以构成实验数据库。通过Abaqus®软件实施的虚拟裂纹模型进行的数值模拟可以了解混凝土中纤维增强的重要性。实验数据与数值模拟之间的比较表明，在结构设计过程中，钢筋对软化曲线的影响是决定性的，对于SPF模具的尺寸应精确考虑。

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