چکیده مقاله
Adhesively bonded joints are increasingly employed in lightweight aerospace, automotive, and marine structures, where accurate prediction of fracture initiation and propagation is critical for damage tolerant design This study presents a systematic numerical comparison of three finite element fracture modelling approaches, namely surface based cohesive zone modelling CZM SB , element based cohesive zone modelling CZM EB , and the extended finite element method XFEM , applied to Mode I fracture of adhesively bonded double cantilever beam joints Three adhesives spanning the full brittleness spectrum were investigated, including a brittle epoxy Araldite AV138 , a semi ductile epoxy Araldite 2015 , and a ductile polyurethane Sikaforce 7752 , all bonded to aluminum adherends All simulations were performed in ABAQUS under quasi static loading with identical geometry, boundary conditions, and cohesive parameters across all nine model configurations The results show that the two CZM formulations produce virtually indistinguishable predictions for semi ductile and ductile adhesives, while a peak load difference of approximately 6% for the brittle adhesive indicates that they are not fully interchangeable under abrupt crack propagation XFEM systematically over predicts the peak load, with the discrepancy most pronounced for the brittle adhesive and diminishing progressively with increasing ductility CZM EB offers the best overall combination of accuracy, computational efficiency, and numerical stability and is therefore recommended as the preferred approach when the crack path is known a priori
کلیدواژهها
نویسندگان
A.A Sirous
۱ M Sc Student in Mechanical Engineering, Iran University of Science and Technology
M.R Ayatollahi
۲ Full Professor, Fatigue and Fracture Research Laboratory, School of Mechanical
شیوه ارجاع
Sirous, A.A and Ayatollahi, M.R,1404,A Numerical Comparison of Cohesive Zone Models and XFEM for Mode I Fracture of Adhesive Joints with Brittle to Ductile Adhesives,29th National Conference on Electrical, Computer and Mechanical Engineering,Shirvan
ارائهشده در
مجموعه مقالات بیست و نهمین کنفرانس ملی مهندسی برق ،کامپیوتر و مکانیک28 بهمن 1404 · شیروان