Fatigue behaviour of strain-hardening cement-based composites (SHCC)
Fatigue behaviour of strain-hardening cement-based composites (SHCC)
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DOI：
10.1016/j.cemconres.2016.11.003
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发表时间：
2017-02-01
影响因子：
11.4
通讯作者：
Mechtcherine, Viktor
中科院分区：
文献类型：
--
作者：
Mueller, Steffen;Mechtcherine, Viktor
应变硬化水泥基复合材料（SHCC）在结构和非结构应用中的安全使用通常需要对这种新型材料在循环荷载下的力学性能有扎实的了解。本文介绍了一个全面的实验研究的结果，重点是疲劳行为和破坏机制的SHCC与聚乙烯醇纤维和各种加载制度。单轴试验进行了拉伸膨胀试验和交替拉伸压缩循环试验。虽然上反转点由给定的变形增量或载荷水平控制（取决于所选择的状态），但下反转点始终由给定的载荷值控制。实验表明，随着上限应力水平的增加，施加的应变增量较小，并从纯拉伸加载到交替拉伸-压缩制度的过渡，载荷循环次数明显减少。研究了这些试验参数对SHCC应变能力等材料性能的影响。根据试验结果，裂纹模式的评价和断裂表面条件的微观分析，确定了四种不同的失效模式，每种模式都是特定循环载荷情况下的典型模式。(C)2016爱思唯尔有限公司版权所有。
The safe use of strain-hardening cement-based composites (SHCC) in structural and non-structural applications often requires a solid knowledge of the mechanical performance of this novel material under cyclic loading. The article at hand presents the findings of a comprehensive experimental investigation focusing on fatigue behaviour and failure mechanisms of SHCC made with polyvinyl-alcohol fibre and subject to various loading regimes. Uniaxial tests were performed both as tension-swelling tests and alternating tension-compression cyclic tests. While the upper reversal point was controlled - depending on the chosen regime - either by a given deformation increment or load level, the lower reversal point was always controlled by a given load value. The experiments revealed a pronounced decrease in the number of load cycles to failure with increasing upper stress level, smaller applied strain increments and with transition from purely tensile loading to alternating tension-compression regime. Furthermore, the effects of these tests parameters on strain capacity and other material properties of SHCC were investigated. On the basis of the test results, evaluation of the crack patterns and microscopic analysis of the conditions of the fracture surfaces, four various failure modes were identified, each of them typical for particular cyclic loading scenarios. (C) 2016 Elsevier Ltd. All rights reserved.