Cure-induced strain and failure in deltoid of composite T-joints

被引:18
作者
Hisada, Shinsaku [1 ]
Minakuchi, Shu [2 ]
Takeda, Nobuo [1 ]
机构
[1] Univ Tokyo, Grad Sch Frontier Sci, Dept Adv Energy, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778561, Japan
[2] Univ Tokyo, Grad Sch Engn, Dept Aeronaut & Astronaut, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138656, Japan
关键词
Cure behavior; Residual/internal stress; Process monitoring; Joints/joining; PIECE SPECIMENS; DELAMINATION; CRACKING; PREDICTION; DEFORMATION; BEHAVIOR;
D O I
10.1016/j.compositesa.2020.106210
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Composite structures are generally considered to be difficult to apply to joining components. A T-joint is an important element in aircraft structures that transfers loads between vertical and horizontal panels. However, Tjoints present cracks that occur in the deltoid during their manufacture because of process-induced cure and thermal stress. Such cracking significantly reduces the mechanical performance of T-joints. Although a number of studies have been conducted on the behavior of T-joints under mechanical loading, studies on the behavior of Tjoints during curing are limited. Therefore, this study is proposed to be the first to measure the strain distribution throughout the deltoid using an optical fiber. Firstly, three types of deltoid structures with differently oriented interlaminar toughened layers were used, and the relationship between the strain distribution and the failure pattern of the deltoid were examined. Based on the experimental results, finite element analysis is conducted and a failure index for the process-induced failure of deltoids was developed. Finally, a deltoid configuration to suppress process-induced failure was established and validated based on the results of the experiment and analysis.
引用
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页数:15
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