Libin Zhao
Beihang University
Composite numberUltimate tensile strengthFinite element methodComposite laminatesBolted jointComposite materialBridging (networking)Materials scienceJoint (geology)StiffnessMixed modeMaterial propertiesStrain energy release rateCohesive zone modelStructural engineeringDelaminationFiber pull-outBucklingStress (mechanics)Fracture toughness
69Publications
21H-index
1,157Citations
Publications 69
Newest
#1Jianyu Zhang (Chongqing University)H-Index: 25
#2Longwei Zhou (Beihang University)H-Index: 8
Last. Binjun Fei (Beihang University)H-Index: 5
view all 5 authors...
A new material degradation model only with fundamental material properties required is proposed for composite progressive damage analysis based on micromechanics. For different failure modes, the effects of fiber and/or matrix damage on the composite material properties are explored, from which the material degradation factors for these failure modes are deduced. The material degradation model is then implemented for progressive damage analyses, using user subroutines in the commercial code ABAQ...
24 CitationsSource
#1Jie Zhi (Beihang University)H-Index: 5
#2Libin Zhao (Beihang University)H-Index: 21
Last. Zhanli Liu (THU: Tsinghua University)H-Index: 2
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In this paper, a new numerical method that combines a surface-based cohesive model and extended finite element method (XFEM) without predefining the crack paths is presented to simulate the microscopic damage evolution in composites under uniaxial transverse tension. The proposed method is verified to accurately capture the crack kinking into the matrix after fiber/matrix debonding. A statistical representative volume element (SRVE) under periodic boundary conditions is used to approximate the m...
12 CitationsSource
#1Longwei Zhou (Beihang University)H-Index: 8
#2Donghua ZhangH-Index: 1
Last. Fengrui Liu (Beihang University)H-Index: 12
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Abstract A novel design of out-of-plane composite π joints is proposed to elevate the load carrying capability. This design adopts an in-plane π-shaped section scheme along the loading direction to eliminate the delamination damage, which commonly occurs in traditional composite π joints, and uses bolts to connect the joint and other structural components. Static experiments of the novel bolted composite π joint and an aluminum counterpart were conducted. The bolted composite π joint exhibited a...
9 CitationsSource
#1Libin Zhao (Beihang University)H-Index: 21
#2Jie Zhi (Beihang University)H-Index: 5
Last. Ning Hu (Chongqing University)H-Index: 60
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Abstract In this paper, the extended finite element method (XFEM) is extended to simulate delamination problems in composite laminates. A crack-leading model is proposed and implemented in the ABAQUS® to discriminate different delamination morphologies, i.e., the 0°/0° interface in unidirectional laminates and the 0°/90° interface in multidirectional laminates, which accounts for both interlaminar and intralaminar crack propagation. Three typical delamination problems were simulated and verified...
44 CitationsSource
#1Libin ZhaoH-Index: 21
#2Jie ZhiH-Index: 5
Last. Ning HuH-Index: 60
view all 5 authors...
In this paper, the extended finite element method (XFEM) is extended to simulate delamination problems in composite laminates. A crack-leading model is proposed and implemented in the ABAQUS® to discriminate different delamination morphologies, i.e., the 0°/0° interface in unidirectional laminates and the 0°/90° interface in multidirectional laminates, which accounts for both interlaminar and intralaminar crack propagation. Three typical delamination problems were simulated and verified. The res...
#1Libin Zhao (Beihang University)H-Index: 21
#2An Xin (Beihang University)H-Index: 8
Last. Ning Hu (Chongqing University)H-Index: 60
view all 5 authors...
Abstract Static tensile experiments and progressive failure simulations of single-bolt, single- and double-lap joints were carried out to comparatively investigate secondary bending effects, which present significant eccentric-loading phenomena in single-lap joints but are almost non-existent in symmetric double-lap joints. Progressive damage models of single-lap and double-lap joints were established, from which the numerical predictions were found to be in good agreement with the experimental ...
14 CitationsSource
#1Jianyu Zhang (Chongqing University)H-Index: 25
#2Dexuan Qi (Beihang University)H-Index: 2
Last. Ning Hu (Chongqing University)H-Index: 60
view all 5 authors...
A progressive failure analysis model involving hygrothermal effects is presented for predicting failure of composite structures in hygrothermal environments. The model introduces a constitution equation accounting for the hygrothermal strains. Synchronously, the temperature-induced modification of stiffness and strength parameters are involved in the stress analysis model, failure criterion and material degradation rules. A user defined subroutine was developed and embedded into a FEA package to...
24 CitationsSource
#1Jianyu Zhang (Chongqing University)H-Index: 25
#2Libin Zhao (Beihang University)H-Index: 21
Last. Yuli Chen (Beihang University)H-Index: 21
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Abstract The compression fatigue behaviors of CFRP laminates with impacted or quasi-static indented damage for two material systems, CCF300/QY9511 and CCF300/5428, were compared in this paper. The same surface damages, characterized by dent depth, were induced by low velocity impact (LVI) or quasi-static indentation (QSI) tests for the CFRP laminates. Using visual observation, C-Scan and thermal de-ply experimental measure methods, the surface damage and internal delamination of the specimens ar...
9 CitationsSource
#1Fengrui Liu (Beihang University)H-Index: 12
#2Jianyu Zhang (Chongqing University)H-Index: 25
Last. Longwei Zhou (Beihang University)H-Index: 8
view all 5 authors...
Abstract An analytical tri-linear joint stiffness model accounting for the effect of bolt-hole clearances on the bearing chord stiffness is presented. A single-parameter iteration method is also proposed to solve the nonlinear system of equations of the load transfer analysis, in which the recursive formulae are verified to be monotonic. To verify the present joint stiffness model, a series of single-lap, single-bolt joints with various bolt-hole clearances and bolt tightening torques were teste...
20 CitationsSource
#1Libin Zhao (Beihang University)H-Index: 21
#2Tianliang Qin (Beihang University)H-Index: 7
Last. Binjun Fei (Beihang University)H-Index: 12
view all 5 authors...
Stress concentration relief factor, which reflects the linear relationship between the stress concentration factors of composite joint and those of elastic isotropic joint, was proposed by Hart-Smith for the failure prediction of composite multi-bolt joints. It is deemed to be determined by experiments from either unloaded- or loaded-hole laminates and is suitable for investigations of bypass and bearing stress concentration factors. To examine this viewpoint, in this paper, the stress concentra...
15 CitationsSource