基于表面应变法的DCB胶接界面断裂行为

doi:10.7527/S1000-6893.2025.33236

Abstract

Abstract:

To meet the integrity requirements of advanced lightweight bonded structures， this study designed conventional （Titanium alloy-Titanium alloy， Ti-Ti） and bi-material （Carbon Fiber Reinforced Polymer-Titanium alloy， CFRP-Ti） Double Cantilever Beam （DCB） bonded joints capable of achieving pure Mode Ⅰ fracture based on the longitudinal strain consistency criterion， focusing on the fracture behavior of CFRP-Ti bi-material bonded joints （a key load-bearing component in lightweight structures） under Mode Ⅰ loading； meanwhile， integrating Distributed Optical Fiber Sensing （DOFS） technology with Euler-Bernoulli beam theory， a method for deriving the interface Traction-Separation Relationship （TSR） and fracture toughness based on surface strain measurements was proposed. Through systematic investigation of the fracture behavior of the two types of joints under Mode Ⅰ loading， the influence mechanisms of different adherend combinations on the interfacial TSR， fracture toughness， and Fracture Process Zone （FPZ） were clarified. Results show that the proposed method can effectively obtain key parameters throughout the fracture process， including TSR， fracture toughness， crack propagation length， and cohesive zone size， and inputting the measured test data into finite element simulations enables accurate reproduction of the test process. Under pure Mode Ⅰ loading， the fracture toughness of the conventional and bi-material joints are （0.45±0.04） N/mm and （0.49±0.08） N/mm， respectively， indicating that the macroscopic fracture toughness and cohesive constitutive relationship are mainly dominated by the adhesive layer’s own properties with no significant influence from the adherend materials； however， the stiffness mismatch of adherends in the bi-material joint significantly affects the mechanical behavior of the FPZ， which exhibits a higher peak traction （（20±1） MPa） and distinct traction distribution characteristics. By extracting the traction distribution at the interface， precise quantification of the crack length and FPZ is achieved， providing important theoretical basis and data support for the failure analysis and performance evaluation of advanced lightweight bonded structures.

Key words: traction separation relationship, double cantilever beam, Mode Ⅰ fracture, adherends, surface strain, distributed optical fiber sensing

CLC Number:

V215.6

Yilin JIN, Yusheng LIU, Shijie ZHANG, Jiacheng LIU, Xudan YAO, Wandong WANG. Fracture behavior of DCB bonded interface based on surface strain method[J]. Acta Aeronautica et Astronautica Sinica, 2026, 47(17): 233236.

Figures/Tables 25

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Table 1

Mechanical properties of materials

材料	弹性模量 $E x$ /MPa	弹性模量 $E y$ ， $E z$ /MPa	弯曲模量 $E f$ /MPa	剪切模量 $G x$ /MPa	泊松比 $ν$
TC4^［24］	116 533	116 533	116 533±2 938	42 000	0.33
CFRP^［25］	130 000	8 000	110 153±3 035	5 200	0.3
Araldite^®2015^［27］	1 850	1 850		560	0.33

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材料	步骤1	步骤2	步骤3	步骤4
碳纤维增强复合材料	去除表面脱模布	丙酮擦拭	紫外线/臭氧处理15 min
钛合金	丙酮擦拭	喷砂处理	丙酮擦拭	紫外线/臭氧处理5 min

Fracture behavior of DCB bonded interface based on surface strain method

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[1]	TONG Dihua, WU Xueren, LIU Jianzhong. Weight function method of determining double cantilever beam specimen stress intensity factor by crack mouth displacement [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(2): 609-616.
[2]	XU Fei, PAN Lei, BAI Yunrui, CAO Jiameng, TAO Jie, TAO Haijun, CAI Lei. Effects of Titanium Surface Anodization on Adhesive Bonding Properties of TA2/polyetheretherketone(PEEK) [J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(6): 1724-1732.