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首页> 外文期刊>Materials and structures >Double edge wedge splitting (DEWS): an indirect tension test to identify post-cracking behaviour of fibre reinforced cementitious composites
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Double edge wedge splitting (DEWS): an indirect tension test to identify post-cracking behaviour of fibre reinforced cementitious composites

机译：双边缘楔形劈裂（DEWS）：间接张力测试，用于确定纤维增强水泥基复合材料的龟裂后行为

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摘要

Experimental identification of the tensile constitutive behaviour of fibre reinforced cementitious composites represents a foremost step in design approaches for structural elements made with this kind of advanced construction materials. To this purpose, international standards and guidelines recommend either direct tension or/and bending tests, coupled with an inverse analysis procedure, both featuring pros and cons which have been exhaustively highlighted and discussed in these last years. The tremendous developments of self compacting fibre reinforced concretes have furthermore highlighted the need of duly taking into account, within the aforementioned identification procedure, the likely flow-induced alignment of fibres with the applied tensile stress. In this paper a novel experimental testing technique, called double edge wedge splitting test, has been presented and validated, also by means of nonlinear finite element analysis. The test, as it will be shown, is able to yield directly, i. e. with no need for back analysis, the tensile stress versus crack opening "constitutive relationship" of the material, though performing an "indirect" test, i. e. by applying a compressive load to the specimen. Both the simplicity of the indirect tensile testing technique and the straightforwardness of the identification procedure surely represent a distinctive and extremely attractive characteristic of the proposed test. Furthermore, the test features a compact specimen geometry, which can be even easily "cored" from existing structures, and a "notch preordained" fracture plane, which can be aligned to any desired angle with respect to the expected flow-induced fibre orientation. This makes the proposed test suitable for a thorough characterization of the influence of fibre orientation on the material constitutive behaviour, as it may be required by a casting process tailored to the intended applications.
机译：对纤维增强水泥基复合材料的拉伸本构行为的实验鉴定是用这种高级建筑材料制成的结构元件设计方法中的第一步。为此，国际标准和准则建议直接拉伸或/和弯曲测试，以及反向分析程序，两者都具有优点和缺点，这些优点和缺点已在最近几年中进行了详尽地强调和讨论。自密实纤维增强混凝土的巨大发展进一步突出了在上述鉴定程序中充分考虑到可能的流动引起的纤维与所施加的拉应力的对准的需要。在本文中，还提出了一种新颖的实验测试技术，称为双边楔形劈裂测试，并且还通过非线性有限元分析进行了验证。如将显示的那样，该测试能够直接产生，即。 e。无需进行反分析，尽管进行了“间接”测试，但材料的拉伸应力与裂纹开口的“本构关系”为： e。通过对样品施加压缩载荷。间接拉伸试验技术的简便性和鉴定程序的简便性无疑都代表了所提出试验的独特和极具吸引力的特性。此外，该测试具有紧凑的试样几何形状，该几何形状甚至可以很容易地从现有结构中“取芯”，以及一个“缺口预定的”断裂平面，该断裂平面可以相对于预期的流致纤维取向与任何所需角度对齐。这使得建议的测试适合于彻底表征纤维取向对材料本构特性的影响，因为针对预期应用的铸造工艺可能需要进行此测试。

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