聚丙烯纤维增强工程胶凝复合材料弯曲断裂性能的尺寸效应

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-01-30 DOI:10.3311/ppci.21155

Alireza Hosseini Mehrab, Seyedmahdi Amirfakhrian, M. Esfahani

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引用次数: 0

摘要

研究了含本地废弃物的聚丙烯纤维增强工程胶凝复合材料(PPFECC)的弯曲性能和断裂行为的尺寸效应。采用三点式弯曲试验对尺寸分别为190 × 70 × 70 mm(小)、380 × 70 × 140 mm(中)和760 × 70 × 280 mm(大)的几何相似缺口梁进行了试验，研究了尺寸对PPFECC抗弯性能、韧性和断裂行为的影响以及PPFECC拉伸延性对尺寸效应参数的影响。制备了聚丙烯纤维体积分数分别为1% (PPFECC1)和2% (PPFECC2)的两种PPFECC混合物。结果表明，两种PPFECCs的延性、抗弯强度、归一化挠度、归一化韧性和断裂能均存在明显的尺寸效应。与PPFECC2相比，PPFECC1的拉伸延展性较低，其弯曲性能和断裂行为对尺寸效应参数更为敏感。此外，根据Bažant的尺寸效应曲线，具有更高拉伸延性的PPFECC2中缺口梁的行为比PPFECC1更接近强度准则。

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Size Effect on Flexural and Fracture Properties of Polypropylene Fiber-reinforced Engineered Cementitious Composite

The size effect on flexural properties and fracture behavior of polypropylene fiber-reinforced engineered cementitious composite (PPFECC) containing local waste materials was investigated. Geometrically similar notched beams with dimensions of 190 × 70 × 70 mm (small), 380 × 70 × 140 mm (medium), and 760 × 70 × 280 mm (large) were tested using three-point bending to study the size effect on flexural properties, toughness, and fracture behavior in PPFECC and the influence of tensile ductility of PPFECC on the size effect parameter. Two PPFECC mixtures containing 1% (PPFECC1) and 2% (PPFECC2) volume fraction of polypropylene fibers were prepared. The results indicated clear size effect on ductility, flexural strength, normalized deflection, normalized toughness, and fracture energy for both PPFECCs. The flexural properties and fracture behavior in PPFECC1 were more sensitive to the size effect parameter due to its lower tensile ductility compared to PPFECC2. Moreover, according to Bažant’s size effect curve, the behavior of notched beams in PPFECC2 with higher tensile ductility was closer to the strength criterion compared to PPFECC1.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.