Research on mechanical properties and failure mechanism of TRM composites via digital image correlation method and finite element simulation. (1st May 2023)

• Record Type: Journal Article
• Authors: Zhao, Mingyue; Pei, Xiaoyuan; Luo, Shigang; Yan, Minjie; Xing, Wenjin; Wang, Wei; Liu, Shengkai; Shao, Ruiqi; Xu, Zhiwei
• Is Part Of: Composite structures. Volume 311(2023)
• Publication Date: 2023-05-01
• Subjects: Textiles -- Stress transfer -- Interface -- Finite element simulation -- Digital image correlation method; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2023.116798
• Languages: English
• ISSNs: 0263-8223

Abstract

Highlights: Stress-strain curves and crack development of TRM composites under tension exhibit four stages. The fiber bundle configurations of reinforced textiles are the main factors affecting the tensile failure mechanism of TRM composites. Factors influencing the interfacial bonding response in double-lap shear tests are explored. Abstract: The purpose of this paper is to study tensile properties and interfacial bonding properties of textile reinforced mortar composites (TRM) widely used for externally strengthening damaged buildings. Based on the digital image correlation (DIC) method and finite element (FE) simulation, the tensile and interfacial shear test results of steel fiber textile and carbon fiber textile reinforced mortar composites were analyzed. First, DIC was used to detect the crack onset and propagation of the specimen during the tensile process. The concept of gradient interface was introduced to improve the bonding performance. The effects of the hydration degree of mortar, and reinforcing textile type on interfacial bonding properties were then evaluated through double-lap shear testing. Last, the stress distribution and load transfer during textile pull-out from the mortar were analyzed based on FE simulation with the bond-slip law extracted from the double-lap shear experiment.