关键词: 复合材料, 内嵌式T形接头, 制备工艺, 初始损伤特性, 损伤演变, 失效机理, 极限承载

Abstract: Based on the embedded T-joint scheme of FRP/steel given in Reference [1] , the structural form was optimized and the embedded T-joint scheme was proposed. In the preparation process, three types of joints were put forward: Without U-shaped groove (type Ⅰ), with U-shaped groove (type Ⅱ) and with U-shaped groove and plain fabric suture ( type Ⅲ ) at the sealing core of the steel groove. And the embedded T-type connection joint was made for the above three process schemes. The tensile and compressive bending bearing characteristics of the three joints were tested, and the initial damage characteristics, damage evolution and failure mechanism of the three joints were compared and analyzed. The results show that: The embedded T-shaped connection scheme effectively reduces the stress concentration level of the end faces on both sides of the steel channel and the laminated plate under the compression bending load, and the sealing rubber can play a good sealing effect and stress buffer role; the initial damage load of type Ⅲ joint is the highest under both tensile and compressive bending loads, and the connection reliability of type Ⅲ joint is higher under the ultimate load state.

Key words: composite materials, embedded T-joint, preparation process, initial damage characteristics, damage developing, failure mechanism, ultimate bearing