Fatigue behavior of sisal fiber reinforced cement composites

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• 作者：Flá ; vio de Andrade Silva ; Barzin Mobasher ; Romildo Dias Toledo Filho
• 关键词：Cement composites ; Sisal fibres ; Fatigue behavior ; Microcracking ; Stress– ; strain
• 刊名：Materials Science and Engineering: A
• 出版年：2010
• 出版时间：20 August 2010
• 年：2010
• 卷：527
• 期：21-22
• 页码：5507-5513
• 全文大小：700 K

文摘

The tensile fatigue behavior of long aligned sisal fiber reinforced cement composites was investigated. The fatigue behavior was examined in terms of the stress versus cycles and stress–strain hysteresis behavior of the composites. Composites were tested at stress levels ranging between 4 and 9.8 MPa which represent approximately 30–80 % of the monotonic ultimate tensile strength. The composites did not fail in fatigue below a maximum fatigue level of 6 MPa up to 10⁶ cycles. Monotonic tensile testing was performed for composites that survived 10⁶ tests to determine the residual strength. Crack spacing was measured by image analysis technique. There was no observed loss in strength, but a decrease in Young's modulus and an increase in first crack strength was observed with increasing fatigue stress. Fluorescent optical microscopy was used to investigate the micro-crack formation in composites subject to fatigue loading.