Numerical analysis of effect of cohesive parameters on mixed-mode failure of double-scarf adhesive joint subjected to uniaxial tensile loadings

IMECH-IR > 流固耦合系统力学重点实验室

	Numerical analysis of effect of cohesive parameters on mixed-mode failure of double-scarf adhesive joint subjected to uniaxial tensile loadings
	Liao LJ(廖丽涓); Huang CG(黄晨光); ljl@imech.ac.cn; huangcg@imech.ac.cn
会议录名称	PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2015, VOL 2B
	2015
会议名称	Proceedings of the ASME 2015 International Mechanical Engineering Congress & Exposition
会议日期	Nov. 13-19, 2015
会议地点	Houston, TX
摘要	In the present study, the effects of cohesive parameters on the mixed-mode failure of double-scarf adhesive joint (DSAJ) subjected to uniaxial tensile loadings were examined and discussed numerically. For DSAJ with no perpendicular or parallel with the external loading direction, complex stress state (mixture of tensile and shear stresses) occurs at the adhesive interface. In addition, adhesive joint failure, which is a gradually process rather than a sudden transition, is accompanied by energy dissipates gradually at the crack tip. Correspondingly, cohesive zone model (CZM) coupled with finite element method (FEM) was implemented to verify the mechanism of crack from initiation to the complete failure. As the constitutive relation of the adhesive layer, the traction separation (T-S) law determines the interface damage evolution. Additionally, the shape of T-S curves in mode I and mode II are crucially decided by the cohesive strengths and critical fracture energies in each mode, respectively. Firstly, the non-dimensional-normalized form of ultimate tensile loading of DSAJ was obtained using dimensional analysis. Then, three cases of cohesive parameters (case of constant anisotropy extent & case of constant critical fracture energy in each mode & case of constant cohesive strength in each mode) according to the non-dimensional-normalized form of adhesive properties were designed. Two types adhesives (brittle and ductile) were chosen to examine the effects of adhesive properties on the failure of DSAJ in this study. To avoid the influence of the geometries on DSAJ mechanical behaviors, the thickness of the adhesive layer and the scarf angle 0 were held constantly, respectively. In numerical calculations, the change trends of the ultimate tensile loading (F-u), the failure energy (E-f) and the damage level (D) corresponding to F-u with respect to the cohesive parameters were discussed. It can be observed the cohesive strengths in mode I and mode II codetermine F of DSAJ with unequal rates. Moreover, Ef of DSAJ, which is the necessary energy for the joint failure, is governed by the critical fracture energies in mode I and mode II with different contributions. Besides, it also obtained that the evolutions of D corresponding to F-u of DSAJ with brittle and ductile adhesives are certain different. Generally, D of DSAJ with brittle adhesive is higher and more uneven than that of DSAJ with ductile adhesive. Accordingly, it can be concluded that DSAJ with brittle adhesive has lower ability to distribute the loading over a smaller cohesive zone with less uniform distribution. In addition, the numerical results revealed that with the increment of ratio in each case set in this paper, D of DSAJ does not rise obviously.
WOS记录号	WOS:000379703000031
课题组名称	LMFS冲击与耦合效应(LHO)
ISBN号	978-0-7918-5736-6
收录类别	CPCI-S ; EI
语种	英语
引用统计
文献类型	会议论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/58338
专题	流固耦合系统力学重点实验室
通讯作者	ljl@imech.ac.cn; huangcg@imech.ac.cn
推荐引用方式 GB/T 7714	Liao LJ,Huang CG,ljl@imech.ac.cn,et al. Numerical analysis of effect of cohesive parameters on mixed-mode failure of double-scarf adhesive joint subjected to uniaxial tensile loadings[C]PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2015, VOL 2B,2015.

条目包含的文件		下载所有文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
ASME-IMECE2015-50118（809KB）	会议论文		开放获取	CC BY-NC-SA	浏览下载