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Liyong Tong - One of the best experts on this subject based on the ideXlab platform.
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Bending Effect of through thickness reinforcement rods on mode ii delamination toughness of enf specimen elastic and rigid perfectly plastic analyses
Composites Part A-applied Science and Manufacturing, 2007Co-Authors: Liyong TongAbstract:Abstract In this paper, a new simple metallic z-rod model is proposed to study the Bending Effect of the metallic z-rods on mode II delamination toughness of laminated composites. A new transverse shear force–deformation relationship for a metallic z-rod is obtained by using the classical beam theory and modeling its surrounding matrix as linearly elastic, rigid–perfectly plastic or linearly elastic–perfectly plastic springs. The bridging traction provided by a metallic z-rod to the mode II delamination toughness is assumed to be only the shear force carried by a z-rod created by the relative slippage between two substrate beams in an end-notched flexure (ENF) specimen, whereas the longitudinal sliding friction is assumed to make negligible contribution to the bridging traction. Mode II strain energy release rate (SERR) is employed to evaluate the influence of the metallic z-rods on the interlaminar fracture toughness of end-notched flexure (ENF) specimens. A parametric study of ENF specimens reinforced with the z-rods is conducted to demonstrate the Effect of the new bridging mechanism by the metallic z-rods on the mode II delamination toughness.
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Bending Effect of through-thickness reinforcement rods on mode II delamination toughness of ENF specimen: Elastic and rigid–perfectly plastic analyses ☆
Composites Part A: Applied Science and Manufacturing, 2007Co-Authors: Liyong Tong, Xiannian SunAbstract:Abstract In this paper, a new simple metallic z-rod model is proposed to study the Bending Effect of the metallic z-rods on mode II delamination toughness of laminated composites. A new transverse shear force–deformation relationship for a metallic z-rod is obtained by using the classical beam theory and modeling its surrounding matrix as linearly elastic, rigid–perfectly plastic or linearly elastic–perfectly plastic springs. The bridging traction provided by a metallic z-rod to the mode II delamination toughness is assumed to be only the shear force carried by a z-rod created by the relative slippage between two substrate beams in an end-notched flexure (ENF) specimen, whereas the longitudinal sliding friction is assumed to make negligible contribution to the bridging traction. Mode II strain energy release rate (SERR) is employed to evaluate the influence of the metallic z-rods on the interlaminar fracture toughness of end-notched flexure (ENF) specimens. A parametric study of ENF specimens reinforced with the z-rods is conducted to demonstrate the Effect of the new bridging mechanism by the metallic z-rods on the mode II delamination toughness.
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Bending Effect of through thickness reinforcement rods on mode i delamination toughness of dcb specimen i linearly elastic and rigid perfectly plastic models
International Journal of Solids and Structures, 2004Co-Authors: Liyong TongAbstract:The use of through-thickness reinforcement in the form of short rods has been proposed to improve the interlaminar properties of laminated composites in the recent years. Compared to a fibrous short rod, which is often referred to as z-fiber, a metallic rod, referred to as z-rod in this paper, has reasonably high capability to carry transverse loading, i.e., a z-rod can provide both axial and transverse bridging tractions to the delamination crack. Therefore, a new analytical model is proposed to study the Bending Effect of the z-rods on mode I delamination toughness of laminated composites. In this new model, both the axial pull-out and the transverse Bending are considered simultaneously. New Bending moment and displacement relationships for a single z-rod are established by modeling the z-rod embedded in a linearly elastic and rigid-perfectly plastic matrix using the classical beam theory. By using an approximate expression for mode I fracture toughness of double-cantilever-beam (DCB) specimen, a parametric analysis of DCB specimen reinforced by the z-rods is conducted. The present numerical results show that the Bending Effect should not be ignored when stiffer z-rods are employed to reinforce the laminated composites.
Baiou Guan - One of the best experts on this subject based on the ideXlab platform.
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Refractive Index Sensitivity Enhancement by Bending Fiber Taper Modal Interferometer
Asia Communications and Photonics Conference 2014, 2014Co-Authors: Li-peng Sun, Long Jin, Baiou GuanAbstract:We study the Bending Effect of a taper-based modal interferometer on the interference fringes and refractive index sensitivity. The sensitivity is increased by 3.48 times and reaches 1192.7nm/RI-unit as curvature increases from 0 to 0.283mm−1.
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Bending Effect on modal interference in a fiber taper and sensitivity enhancement for refractive index measurement
Optics Express, 2013Co-Authors: Jie Li, Baiou GuanAbstract:We demonstrate the Bending Effect of microfiber on interference fringes in a compact taper-based modal interferometer and sensitivity for refractive index (RI) measurement. For the bend curvature ranging from 0 to 0.283 mm−1, the measured RI sensitivity distinctively increases from 342.5 nm/RIU (refractive-index unit) to 1192.7nm/RIU around RI = 1.333 and from 3847.1 nm/RIU to 11006.0 nm/RIU around RI = 1.430, respectively. Theoretical analysis reveals that such enhancement is determined by the dispersion property of the intermodal index rather than other parameters, such as the variation of the straightforward evanescent field. The magnitude of sensitivity varies as a function of the microfiber bend curvature. Approaching a critical curvature (the intermodal-index dispersion factor approaches zero), the sensitivity is significantly enhanced, exhibiting great potential in RI sensing areas.
Wanquan Li - One of the best experts on this subject based on the ideXlab platform.
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Theoretical research on the Bending Effect of piezoelectric quartz and experimental verification
2009 International Conference on Mechatronics and Automation, 2009Co-Authors: Wanquan LiAbstract:The Bending Effect of a piezoelectric quartz beam is first investigated in the paper. According to the anisotropic elasticity and Maxwell electromagnetic theory, the stress field and electrostatic field is deduced. The distribution of the electric field in the piezoelectric beam is calculated by the Finite Element Method. Based on the theoretical analysis of the bound charge distribution, using the partitioned electrode method the measuring electrodes are Effectively disposed on the surfaces of the piezoelectric quartz beam. A specially designed experiment is performed to validate that the polarization charge is linear with the external force, and the experimental results are agreement with the theoretical ones. The research will provide the theoretical and experimental foundation for designing a new type of quartz resonator or actuator based on the Bending Effect of a quartz beam, and eventually establishing the piezoelectric theory of quartz crystal based on deformation analysis.
Kin Seng Chiang - One of the best experts on this subject based on the ideXlab platform.
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temperature compensation of long period fiber grating for refractive index sensing with Bending Effect
IEEE Photonics Technology Letters, 2002Co-Authors: Zhihao Chen, Kin Seng ChiangAbstract:In this letter, we show that by properly mounting a bent long-period fiber grating (LPFG) on a suitable material, the temperature dependence of the resonance wavelength of the LPFG can be largely eliminated. With this method, we reduced the temperature sensitivity of the resonance wavelength of a typical LPFG by two orders of magnitude from -0.933 nm//spl deg/C to 0.008 nm//spl deg/C. The principle of using this mounted LPFG as a temperature-insensitive chemical concentration or refractive-index sensor is demonstrated.
Peng Zhang - One of the best experts on this subject based on the ideXlab platform.
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Effect of weld zone and corner with cold Bending Effect on wrinkling of rectangular welded tube in rotary draw Bending
Thin-Walled Structures, 1Co-Authors: Hailong Liu, Yuli Liu, Peng ZhangAbstract:Abstract Wrinkling of QSTE700 high strength steel thin-walled rectangular welded tube is easy to occur in rotary draw Bending (RDB) process due to the existence of non-homogeneous weld zone and corner with cold Bending Effect. So the FE model of RDB of QSTE700 rectangular welded tube considering weld zone and corner with cold Bending Effect was established. Based on this FE model, the Effect of weld zone and corner with cold Bending Effect on wrinkling of inner flange and side wall of rectangular welded tube in RDB was researched. The results showed that: when weld zone and corner with cold Bending Effect were studied separately, weld zone both increased the wrinkling height of inner flange and side wall. However, the influence of corner with cold Bending Effect on wrinkling height of side wall and inner flange was inconsistent, it reduced the wrinkling height of inner flange, but increased the wrinkling height of side wall. When the weld zone and corner interacted, the coupling Effect between weld zone and corner with cold Bending Effect on wrinkling resulted in the decrease of wrinkling height of inner flange and increase of wrinkling height of side wall of rectangular welded tube in RDB.