Abstract Strain-hardening cement-based composites (SHCC) are a novel class of fiber-reinforced concretes which exhibit high tensile strain capacity prior to failure localization. Although the tensile behavior of SHCC has been a matter of study in numerous research works, the behavior of these composites under other loading modes has scarcely been investigated. The article at hand addresses the mechanical behavior of two types of normal-strength SHCC subject to uniaxial tension, torsion, and combinations of torsional and axial loading. The SHCC under investigation were made with polyvinyl-alcohol (PVA) and ultra-high molecular weight polyethylene (UHMWPE) fibers, respectively. Digital Image Correlation (DIC) was applied to evaluate the multiple cracking process and crack opening modes in conjunction with the axial and torsional loading histories. The study demonstrates the suitability of torsion experiments to assess the multi-axial and shear performance of SHCC, highlights the relation between multiple cracking and transfer capacity for shear forces, and emphasizes the importance of the type of reinforcing fibers on the shear strength and ductility of such composites.

中文翻译：

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应变硬化水泥基复合材料 (SHCC) 承受扭转载荷以及扭转和轴向联合载荷的力学行为

摘要 应变硬化水泥基复合材料 (SHCC) 是一类新型纤维增强混凝土，在失效局部化之前表现出高拉伸应变能力。尽管 SHCC 的拉伸行为已成为众多研究工作中的一个研究问题，但几乎没有研究过这些复合材料在其他加载模式下的行为。手头的文章讨论了两种类型的法向强度 SHCC 在单轴拉伸、扭转以及扭转和轴向载荷组合下的机械性能。正在研究的 SHCC 分别由聚乙烯醇 (PVA) 和超高分子量聚乙烯 (UHMWPE) 纤维制成。应用数字图像相关 (DIC) 结合轴向和扭转载荷历史来评估多重开裂过程和裂纹张开模式。