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
#1Ruodi Jia (University of Toulouse)
#2Libin Zhao (Beihang University)H-Index: 21
Last. Xiaojing Gong (University of Toulouse)H-Index: 1
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Abstract Strain energy release rate (SERR) along a linear crack front of a multidirectional composite DCB specimen shows an obviously non-uniform distribution, which causes the fracture toughness GIavg measured by experiments smaller than the real GIC, and so leading to a lower estimation of fracture toughness. In this study, based on the numerical model a novel semi-empirical closed-form formula was proposed for determination of pure mode I fracture toughness of a multidirectional composite DCB...
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#1Kangkang Wang (Beihang University)H-Index: 4
#2Libin Zhao (Beihang University)H-Index: 21
Last. Yu Gong (Chongqing University)H-Index: 12
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Abstract Delamination represents one of the most severe failure modes in composite laminates, especially when they are subjected to uniaxial compression loads. The evaluation of the delamination damage has always been an essential issue of composite laminates for durability and damage tolerance in engineering practice. Focusing on the most typical and representative elliptical delamination issue, an analytical model simultaneously considering the conservative buckling process and non-conservativ...
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#1Tiancheng Cao (Beihang University)H-Index: 2
#2Libin Zhao (Beihang University)H-Index: 21
Last. Jianyu Zhang (Chongqing University)H-Index: 25
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Abstract Large scale fiber bridging in composite laminates is one of the most common toughening mechnisms, exerting a close-force on the crack surfaces to restrain the delamination propagation. To account for the effect of the fiber bridging in delamination simulation, a physically semi-analytical method based on the Euler-Bernoulli beam theory considering the bridging stress is presented. The mode I energy release rate for every crack length is explicitly expressed in terms of the external load...
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#1Gong Yu (Chongqing University)
#1Yu Gong (Chongqing University)
Last. Ning Hu (Chongqing University)H-Index: 60
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Abstract R-curve and traction-separation relation are commonly used to characterize the fiber bridging, which is significant toughening mechanism in composite laminates. Current investigations are mainly focused on unidirectional laminates. However, the dependence of the R-curve and traction-separation relation on the stacking sequence is still lack of comprehensive studies. Here, the effect of stacking sequence on the R-curve and traction-separation relation in unidirectional and multidirection...
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#1Ruixue Ji (Beihang University)
#2Libin Zhao (Beihang University)H-Index: 21
Last. Jianyu Zhang (Chongqing University)H-Index: 25
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Abstract Effects of stiffener debonding defects on postbuckling responses and failure behaviors of composite stiffened panels which have extensive applications in aerospace structures attract significantly increasing attention recently. Aiming to this problem, a series of nonlinear analyses comprehensively accounting for multiple failure modes including intra- and inter-laminar damage in composite laminates, adhesive layer damage between stiffeners and skin, as well as buckling and postbuckling ...
1 CitationsSource
#1Yu Gong (Chongqing University)H-Index: 12
#2Libin Zhao (Beihang University)H-Index: 21
Last. Chuanzeng Zhang (University of Siegen)H-Index: 38
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Abstract The original data reduction method in the ASTM standard D6671/D6671M-13 is established for unidirectional laminates free of fiber bridging. However, for multidirectional laminates, large-scale fiber bridging occurs in the wake of the crack-tip. Whether the original data reduction method can be applied for multidirectional laminates is questionable. This paper examines the effects of the complex failure mechanism on the flexural modulus of the multidirectional laminates, and how to avoid...
2 CitationsSource
#1W.M. Mahdy (Beihang University)
#2Libin Zhao (Beihang University)H-Index: 21
Last. Jianyu Zhang (Chongqing University)H-Index: 25
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Abstract Advanced composite laminated cylindrical shells are increasingly being desired in modern aerospace structures, for improving their structural efficiency and performance. In this paper, compared with the previous failure analysis, which considered buckling-failure only, a competitive failure analysis framework for composite laminated cylindrical shells is presented, in which linear buckling interacting curve method was considered for buckling-failure analysis and strength ratio based on ...
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#1Fengrui Liu (Beihang University)H-Index: 12
#2Yao Wanting (Beihang University)H-Index: 1
Last. Jianyu Zhang (Chongqing University)H-Index: 25
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Abstract An improved 2D finite element model for bolt load distribution predictions of composite multi-bolt single-lap joints is proposed considering both the efficiency and the accuracy, and this model predicts secondary bending well, which is an important factor for failure of single-lap joints. In this model, the shell element is used to simulate laminates, the fastener technique is used to model bolts, and fasteners are connected to shell elements with coupling constraints. Improvements are ...
2 CitationsSource
#1Tiancheng Cao (Beihang University)H-Index: 2
#2Libin Zhao (Beihang University)H-Index: 21
Last. Jianyu Zhang (Chongqing University)H-Index: 25
view all 5 authors...
Abstract Delamination of composite laminates under mode I loading is usually accompanied by large scale fiber bridging. Characterization of the bridging-traction law is of significant importance in delamination simulations to account for the effect of fiber bridging in such situation. This paper proposed a semi-analytical methodology to determine the bridging-traction law of composite laminates under mode I loading. The enhanced beam theory is physically improved by considering the bending-exten...
4 CitationsSource
#1Meijuan Shan (Beijing Jiaotong University)H-Index: 8
#2Libin Zhao (Beihang University)H-Index: 21
Last. Jianyu Zhang (Chongqing University)H-Index: 25
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Abstract The fatigue failure behaviour of CFRP-metal fastened joints in highly-loaded structures differs from that of CFRP-CFRP or metal-metal fastened joints because of the significant dissimilarity between fatigue damage mechanisms of CFRP and metal materials. In this paper, the competitive fatigue failure behaviour of a CFRP-aluminum two-bolt, double-lap joint was revealed via experiments and a novel numerical prediction method. In the proposed method, fatigue failures of the CFRP and aluminu...
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