References of "Guo, Yingnan"
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See detailStudy of Dynamic Impact Behaviors and Ballistic Properties of Ceramic/UHMWPE Composite Armor
Guo, Yingnan; Sun, Qin; Wu, Ling ULg

in Applied Mechanics and Materials (2012), 121-126

The ballistic properties of different thickness combinations of ceramic/UHMWPE composite armors were studied in this paper, in order to find a better ballistic property structure subject to 12.7mm bullet ... [more ▼]

The ballistic properties of different thickness combinations of ceramic/UHMWPE composite armors were studied in this paper, in order to find a better ballistic property structure subject to 12.7mm bullet. Powder-gun ballistic testing system was used to carry out the normal impact tests to determine the response and the ballistic limit of these combinations of ceramic/UHMWPE composite armors subject to impact loading. Compared with the test, an explicit finite element (FE) model was built with LS-DYNA Code to simulate the impact process. The influence of different parameters on the impact behavior was considered analytically. Results show very good agreement with the experimental data. [less ▲]

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See detailResearch and Implementation of Bird-Strike Resistance Synthetic Analysis Platform for Civil Aircraft
Guo, Yingnan; Qin, Sun; Wu, Ling ULg

in Advanced Science Letters (2011), 4

Bird strike issues are known to cause substantial losses to the civil aviation industry in terms of damage and delay every year. Rules of bird strike resistance are included in many important regulations ... [more ▼]

Bird strike issues are known to cause substantial losses to the civil aviation industry in terms of damage and delay every year. Rules of bird strike resistance are included in many important regulations and guidelines of civil aviation. Based on these rules, attentions should be paid during the design and analysis process for those structures that might be apt to suffer from bird strike as leading edge, radar dome, wind shield and vertical tail. This paper describes a new software infrastructure for bird-strike design and analysis. The bird-strike resistance synthetic analysis platform is a platform that incarnates new research and innovations in bird-strike dynamic strength analysis of our research group. The platform was implement using finite element method and parametric design method based on ESI Pam-crash software, and involves a dynamic performance database of the typical aviation material, a typical structure database for bird-strike resistance, a post-processing modular for result reveal, and an estimation modular for energy absorbing. The material database covers the key constitutive model constants for many common aviation materials. Different bird model for Lagrange, Euler, and SPH algorithm are also covered to fit for different impact speed simulation. The typical structure database are very helpful to the designers because it provides the parametric model of some special bird-strike resistance structures to improve the energy absorbing ability subject to impact. The post-processing modular enables the contour and curve display for the results. The estimation modular gives judgments on the energy absorbing structure by utilizing the criterion and provides proper advices for the design for different cases. [less ▲]

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See detailResearch of Structural Health Monitoring Based on Mode Analysis for UAV Wings
Guo, Yingnan; Wan, Fangyi; Wu, Ling ULg et al

in Prognostics and System Health Management Conference (PHM-Shenzhen), 2011 IEEE Conference on (2011)

Unmanned Aerial Vehicle (UA V) structures are prone to damage during their service lives, caused by abominable environment factors. Its structural health monitoring can be effective in reducing ... [more ▼]

Unmanned Aerial Vehicle (UA V) structures are prone to damage during their service lives, caused by abominable environment factors. Its structural health monitoring can be effective in reducing maintenance costs and increasing service life to ensure safe and reliable operation. Two different damaged modal parameters based on modal analysis is discussed in this paper in order to develop an efficient damage identification technique for the UA V wing structures. Its structure modal is a natural attribute of structures, and apparently one of the most important parameters of structure dynamic characteristics. For a well designed aircraft wings structures, its modal pattern should be continuous without local mode. Therefore, based on the modal analysis utilizing numerical methods for a damaged structure, damages location and its extent can be revealed and damage level can be evaluated. All the numerical results illustrated these method are efficient and feasible for structural damage detection. And its can be utilized in structure [less ▲]

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See detailStudy of Dynamic Impact Behaviors and Ballistic Properties of Hybrid Composites
Guo, Yingnan; Sun, Qin; Wu, Ling ULg

in Key Engineering Materials [=KEM] (2010), 417-418

This paper deals with the ballistic properties of two kinds of hybrid composites: Kevlar/Carbon laminates and S-Glass/Carbon laminates. Twelve kinds of combinations of samples were made including various ... [more ▼]

This paper deals with the ballistic properties of two kinds of hybrid composites: Kevlar/Carbon laminates and S-Glass/Carbon laminates. Twelve kinds of combinations of samples were made including various fibers; various fiber orientations and various target thickness. Air-gun tests were carried out to determine the response of these combinations of hybrid laminates subject to impact loading. Compared with the test, an explicit finite element (FE) model was built with Pam-crash Code to simulate the impact process. The bullet was considered as a deformable body in contact with the composite shells. The Ladevèze model was used to describe the unidirectional properties of Carbon plies and Ladevèze fabric model was used to describe the homogeneous properties of the S-glass and Kevlar laminates. The influence of different parameters on the impact behavior of the two kinds of hybrid laminates was considered analytically. Results show very good agreement with the experimental data. Suggestions are also presented for the better hybrid mode to improve the ballistic properties. [less ▲]

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See detailAn Experimental Study on the Mechanical Performance and Damage Evolution of Woven Fabric E-glass Fiber Reinforced Epoxy Composite
Wu, Ling ULg; Guo, Yingnan; Li, Yulong

in Key Engineering Materials [=KEM] (2010), 417-418

The present study focuses on the mechanical performance and damage evolution of woven fabric E-glass fiber reinforced epoxy composite (7781/F155-glass/epoxy). For the identical behavior in the 0o and the ... [more ▼]

The present study focuses on the mechanical performance and damage evolution of woven fabric E-glass fiber reinforced epoxy composite (7781/F155-glass/epoxy). For the identical behavior in the 0o and the 90o directions of the tested material, the mechanical experiments were performed with 0o and 45o specimens. Three kinds of tests were implemented respectively: tension test with 0o specimen, compression test with 0o specimen, and tension test with 45o specimen which represents the in-plane shear test. Tension, compression and in-plane shear damage, which are defined as the decreasing ratio of modulus, were calculated from the data of quasi-static cyclic tests. The influence of loading rate on material behaviors were investigated under three different loading rates. Although all of the three loading rates are low, it showed that the strain rate has obvious effects on the ultimate strengths and moduli of the glass fiber reinforced epoxy composite. [less ▲]

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