Hung Sying Jing
National Cheng Kung University
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Featured researches published by Hung Sying Jing.
International Journal of Impact Engineering | 1994
Syh-Tsang Jenq; Hung Sying Jing; Charles Chung
Summary This paper is concerned with predicting the ballistic limit of plain woven glass/epoxy composite laminates struck by a 14.9 gm bullet-like rigid projectile with a tip radius of 5 mm. The 4 mm thick square specimens were clamped along their 100 mm edges. A pneumatic gun was used to propel the bullet with incident velocities ranging from 140 to 200 m/sec. The ballistic limit was experimentally determined to be near 153 m/sec. A series of quasi-static punch tests was performed in order to investigate the progressive damage modes of the targets and to obtain the punch load-displacement relation. These quasi-static punch tests were conducted to characterize the penetration process. Similar to dynamic impact test results, the major damage modes for targets subjected to quasi-static punch loading were found to be governed by delamination and fiber breakage. After specimens were perforated, a steady friction force was observed from quasi-static punch tests. Test results also indicate that the rhombus-shaped delamination of impact damaged samples is greater than that of quasi-statically punched specimens. A partial hybrid stress finite element code was incorporated with the proposed static penetration model to simulate the dynamic impact process. An energy consideration was applied to predict the ballistic limit. The difference between the predicted ballistic limit and test findings was found to be approximately 24% if the targets static material properties were used in the code simulation. Due to the rate-sensitive nature of glass/epoxy composites, the effect of dynamic elastic properties on the predicted ballistic limit was further studied. Good agreement between the predicted ballistic limit and test results was found if the targets elastic moduli used in simulation were increased to two times the static values.
AIAA Journal | 1993
Hung Sying Jing; Kuan Goang Tzeng
This paper analyzes the effect of shear deformation in thick laminated anisotropic shells using a mixed formulation based on the functional proposed by Jing and Liao. The displacement field uses a zigzag function in addition to the Reissner-Mindlin type in-plane displacements and a constant transverse deflection. The effect of transverse shear deformation is included through an independently assumed transverse shear stress field. The initial curvature effect is included in the strain-displacement relations, stress resultants, and the assumed shear stress field
Composite Structures | 1995
Hung Sying Jing; Kuan-Goang Tzeng
This paper establishes the three-dimensional elasticity solution for infinitely long, arbitrarily laminated, anisotropic cylindrical panels with simply supported boundary condition under transverse loading. Using a series method, the solution can be formulated exactly. In this study, three groups of stacking sequences with unsymmetric, antisymmetric, and symmetric laminations are used to investigate the behavior of cylindrical panels. They are laminates with [\gq °/90 °], [\gq °/−\gq°], and [\gq°/ − θ°/ \gq°]. The results shown in this paper include deflections, inplane stresses, and transverse stresses. From the present study, it is found that the deflection is controlled by the ply with fiber direction perpendicular to the axis of the panel. The in-plane stresses are basically linear through the thickness. The distributions of transverse normal stresses dominated by the curvature of the shell is quite different from those of laminated plates. The initial curvature effect is again found to be very important.
Journal of Sound and Vibration | 1990
Hung Sying Jing; K.-C. Sheu
Abstract The problem of the response of a single-degree-of-freedom system with amplitude constraint on one side subjected to a random excitation is solved exactly. The Hertz law is used to model the contact phenomena between the mass and constraint during vibration. The excitation is limited to be a stationary white Gaussian process with zero mean. By solving the corresponding Fokker-Planck partial differential equation by separation of variables, the exact stationary solutions of the random response are obtained. The changes due to variations of contact stiffness are discussed.
Computers & Structures | 1990
Hung Sying Jing; M.-L. Liao
Abstract The method proposed by Sachdeva and Ramakrishnan [Int. J. Nwner. Meth. Engng 17, 1257–1271 (1981)] for elastic contact problems with friction is improved by introducing the concept of a contact node pair. The displacements and nodal forces of two contacting nodes are treated as a single variable. The compliance matrix of all the contact node pairs is used rather than the flexibility matrix of each body during iterations. Compatibility of displacements along the contact area is applied in a tangential direction as well as a normal direction for sticking node pairs while Coulombs friction law is used for sliding nodes. All the above relations are written in terms of node pairs, which results in great savings in computer storage and computation time. Several examples for three different kinds of contact, i.e. receding, advancing and stationary, are given to demonstrate the validity of the present scheme.
Computers & Structures | 1990
Hung Sying Jing; M.-L. Liao
Abstract A new element—the partial hybrid stress element—is extended for vibration analysis of thick laminated composite plates. The variational principle of this element can be derived from the Hellinger-Reissner principle to include inertial effects. Equations of motion can then be formulated through variational manipulation. The element stiffness matrix is established by assuming a stress field only for transverse shear, while other stresses are obtained from an assumed displacement field. Traction-free boundary conditions and interface continuity for transverse shear are satisfied exactly. Both consistent and lumped mass matrices are used to investigate the availability of this new element. Examples are illustrated and compared with other published data to demonstrate the accuracy and efficiency of this proposed partial hybrid stress element for vibration analysis.
Computers & Structures | 1992
M.-L. Liao; Hung Sying Jing; M. Hwang
Abstract The partial hybrid stress model proposed by Jing and Liao is combined with the higher order plate element to improve the through thickness distributions of deformations and stresses. Through dividing six stress components into flexural ( σ x , σ y , τ xy , σ 2 ) and transverse shear parts ( τ xz , τ yz ), the combination process can proceed assuming hybrid stress for transverse shear while assuming higher order plate theory for flexural stresses in the Hellinger-Reissner principle. The resulting independent variables are displacements ( u , v , w ) and transverse shear ( τ xz , τ yz ) only. From the usual procedures of displacement elements and hybrid stress elements, this partial hybrid-higher order plate element can be established. The improvements of this new element in analyzing thick composite laminates are expressed through comparing with the results from elasticity and general higher order plate elements. The convergence is also discussed.
Composite Structures | 1993
Hung Sying Jing; Kuan Goang Tzeng
Abstract The basic behavior of the shear deformation plate theories derived from the recently proposed Reissners and Jing-Liaos functionals is studied in this paper. The difference between these two functionals is on the energy form of transverse normal stress. In Reissners functional, the transverse normal stress has to be assumed as well as displacements and transverse shear. On the other hand, the independent variables in Jing-Liaos functional include only displacements and transverse shear. The comparison of these functionals is made through two examples, one with assumed transverse normal stress and the other without. It is found that for the cases studied in this paper Jing-Liaos functional provides a simpler, sometimes even better, alternative approach than Reissners functional in formulating shear deformation theory of thick plates.
International Journal of Solids and Structures | 1995
Hung Sying Jing; Kuan Goang Tzeng
Bending analysis of arbitrarily laminated, anisotropic panels and closed cylinders using the mixed shear deformation theory proposed by the authors is presented. A set of equilibrium, transverse shear compatibility and boundary conditions are obtained by using the mixed variational principle proposed by Jing and Liao (1989, Int. J. Numer. Meth. Engng28, 2813–2827) with displacements and transverse shear as independent variables. The zig-zag type displacement is assumed together with piecewise parabolic transverse shear. The initial curvature effect is included in the strain-displacement relations, stress resultants and assumed transverse shear stresses. Two types of shell geometry, infinitely long cylindrical panels and closed cylinders of finite length, are employed in the numerical study. The cylindrical panels considered are subjected to a transversely sinusoidal loading, while closed cylinders are under an uniform internal pressure. Numerical results presented here are compared with exact three-dimensional elasticity solutions. From these comparisons, it is found that this mixed shear deformation theory can supply reasonably good results.
Composite Structures | 1992
Hung Sying Jing; M. Hwang
Abstract An efficient model based on the recently established partial hybrid stress element is proposed in this paper for global-local analysis of thick composite laminated plates. In this study, for displacement field, the higher order plate theory is used throughout the plate while only the transverse shear stress components are assumed in local regions. Thus, in the region of interest, the flexural stresses ( σ x , σ y , τ xy , σ z ) are still obtained from assumed displacement field while the transverse shear stresses ( τ xz , τ yz ) are calculated by the assumed stress version. The variational principle is also presented in this paper. The proposed functional contains two parts. One is the ordinary potential energy used in the global region; the other is the partial hybrid stress model, which contains displacement and transverse shear as independent variables. The interface equilibrium is guaranteed variationally although no stress parameter is assumed in the global region. Three types of global-local analysis are performed in this paper. These are in-plane analysis, through-thickness analysis, and mixed-type analysis. When compared with elasticity solutions, it is found that the agreement is acceptable, although in the so-called ‘transition region’ the results are less accurate.