Haolong Liu
Nanjing University of Aeronautics and Astronautics
Composite numberUltimate tensile strengthMatrix splittingFinite element methodMatrix (mathematics)Composite laminatesTransverse planeComposite materialRepresentative elementary volumeChipEpoxyTest dataCompression (physics)Compression moldingMaterials scienceModulusVolume (thermodynamics)Tension (physics)Carbon fiber reinforced polymerLayer (electronics)StiffnessConstant (mathematics)Characterization (materials science)SofteningCrack initiationPolymer compositesCell modelCompressive loadTextile compositeMean stressFatigue damageCyclic loadingCross plyMicromechanicsQuasistatic processCarbonFiberExperimental dataCrackingVolume fractionPorosityDelaminationShear (sheet metal)Void (astronomy)MicrostructureStress (mechanics)
10Publications
5H-index
87Citations
Publications 9
Newest
#1Junhua Guo (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 3
#2Weidong Wen (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 11
Last. Haolong Liu (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 5
view all 6 authors...
As a new type of textile composites with broad application prospects, it is essential to study the prediction method of the mechanical properties of 2.5 D woven composites (2.5DWC). Currently, the ...
Source
#1Qingping Sun (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 8
#2Guowei Zhou (OSU: Ohio State University)H-Index: 11
Last. Xuming Su (Ford Motor Company)H-Index: 18
view all 8 authors...
Abstract This study investigates the failure mechanisms of cross-ply laminates subjected to longitudinal compressive loading. A sequence of failure initiation and propagation process is observed based on optical microscopy images of failed specimens. Specifically, the failure process in the cross-ply laminates involves a combination of four failure mechanisms: fiber kinking, delamination, matrix cracking, and fiber/matrix splitting. We find that the kink-bands in the middle 0° plies of the cross...
15 CitationsSource
#1Haibin Tang (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 5
#2Guowei Zhou (OSU: Ohio State University)H-Index: 11
Last. Xuming Su (Ford Motor Company)H-Index: 18
view all 12 authors...
Abstract In present study, the fatigue damage behavior of chopped carbon fiber chip-reinforced composite has been experimentally and numerically investigated. A large scatter is exhibited in the S-N diagram due to the random distribution of carbon fiber chips, and therefore a new analysis procedure is proposed to link the local microstructure to the fatigue behavior of the bulk material. Interrupted fatigue tests are also performed so that microstructure characterization can be conducted on the ...
11 CitationsSource
#1Haolong Liu (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 5
#2A. Ojha (Ford Motor Company)H-Index: 10
Last. Haitao Cui (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 11
view all 9 authors...
Abstract Fatigue tests for unidirectional (UD) CFRP composite specimens of various sizes are conducted under different stress ratios. The results show that the specimen size has considerable influence on the transverse tension-tension fatigue performance of UD laminates. The underlying fatigue mechanisms are also investigated through SEM observations. Moreover, a fatigue life prediction method considering size effects is presented, and a good correlation is observed between the prediction and th...
4 CitationsSource
#1Qingping Sun (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 8
#2Guowei Zhou (OSU: Ohio State University)H-Index: 11
Last. Xuming Su (Ford Motor Company)H-Index: 18
view all 9 authors...
Abstract Failure prediction for carbon fiber reinforced polymer (CFRP) composites has been a longstanding challenge. In this study, we address this challenge by first applying a well-established computational micromechanics model based on representative volume element to predict the failure envelopes of unidirectional (UD) CFRP composites. Then, these failure envelopes are compared with the classical failure criteria. We have evaluated the performances of these failure criteria and identified th...
22 CitationsSource
#1Haolong Liu (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 5
#2Haitao Cui (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 11
Last. Carlos Engler-Pinto (Ford Motor Company)H-Index: 10
view all 6 authors...
Static longitudinal/transverse tensile tests for unidirectional carbon fiber/polymer (T300/924) laminates and laminates with lay-ups [0/±45/0/90]s at various void levels were conducted, and degradations in stiffness/strength were observed with the presence of voids. The void levels were controlled by compression pressure during the compression molding process. The characterization of voids was achieved by digital microscopy image analysis; the density distributions of equivalent diameters and as...
5 CitationsSource
#1Haolong Liu (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 5
#2Haitao Cui (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 11
Last. Hong Tae Kang (UM: University of Michigan)H-Index: 17
view all 4 authors...
10 CitationsSource
#1Haolong Liu (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 5
#2Weidong Wen (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 1
Last. Hong Tae Kang (UM: University of Michigan)H-Index: 17
view all 5 authors...
1 CitationsSource
#1Jian Song (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 17
#1Jian Song (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 32
Last. Ying Xu (NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 6
view all 5 authors...
The response of QY8911-IV resin matrix and T300/QY8911 composite laminates at elevated temperatures was investigated systematically. The mechanical properties and failure mechanism in resin matrix and composites with various fiber volume fractions were also perceived. Based on the experimental results, the corresponding mechanical models were established to describe the relationships between mechanical properties and fiber volume fraction at different temperatures. Test results show that the lon...
15 CitationsSource