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Authors:Yiqun Cao, Xiaoliang Geng, Hui Han, Yahui Lu, Jun Wang, Changan Zhao Abstract: Journal of Sandwich Structures & Materials, Ahead of Print. In this paper, theoretical analysis, numerical simulation and mechanical test on the 3D printed lattice sandwich structures are carried out to study the buckling performance. 2 types of lattice structures, body centered cubic (BCC) and rhombic dodecahedron (DOD) are included. The lattice sandwich panels are made of ALSi10 Mg alloy materials and manufactured using the selective laser melting technique. The comparative results show that DOD lattice sandwich panel not only has higher bearing capacity, but also shows stronger toughness in the post-buckling stage than BCC type panel, even they have the same characteristic size. The buckling mode depends on the topology of the unit cell. For BCC and DOD type panels, the main buckling modes are local buckling and global buckling respectively. The reasons of different buckling modes are discussed. Moreover, the buckling evolution and failure modes of the two types of panels in the post-buckling stage are investigated. Citation: Journal of Sandwich Structures & Materials PubDate: 2022-06-22T02:52:59Z DOI: 10.1177/10996362221108974
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Authors:Vinay Goyal, Jacob I Rome, Dhruv N Patel Abstract: Journal of Sandwich Structures & Materials, Ahead of Print. An experimental test program and companion analytical study were designed and conducted to gain understanding of the tensile failure mechanisms in asymmetrical tapered sandwich core structures at cold temperatures. Representative test coupons were subjected to a tensile load in an environmental chamber to induce foam tensile failure in the core. Finite-element modeling with a proposed maximum principal stress criterion was used to predict the failure loads of the tapered test coupon design at the test temperatures. The predicted failure loads were in good agreement with test results. An important finding is that the cure stresses in the foam are significant and should not be ignored. Additionally, the analysis correctly predicted the failure initiation location, which was verified using high speed photography during the tensile test. The study identified the critical failure regions of asymmetrical tapered sandwich core designs and the failure load dependence on the temperature gradient in the structure. Citation: Journal of Sandwich Structures & Materials PubDate: 2022-06-08T12:46:49Z DOI: 10.1177/10996362221106782
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Authors:Bin Li, Tao Fu First page: 1865 Abstract: Journal of Sandwich Structures & Materials, Ahead of Print. The main objective of this research work is focused on the vibration analysis of auxetic sandwich cylindrical shell structures resting on an elastic foundation. In the analysis, the sandwich shell structure is composed of three layers in which the middle layer consists of auxetic material with a negative Poisson’s ratio, and the two skin layers are isotropic homogeneous materials. The motion equation is extracted according to the first-order shear deformation theory (FSDT) and the Hamilton principle. The governing equations of coupled partial differential equations are solved by the generalized differential quadrature (GDQ) method, and the natural frequencies are determined. By comparing the experimental results with the numerical results calculated by commercial finite element software, the validity of the proposed theoretical model is verified. Finally, the influences of geometrical parameters and elastic foundation on the vibration behavior of sandwich shell structures have been investigated. Citation: Journal of Sandwich Structures & Materials PubDate: 2022-05-18T10:35:32Z DOI: 10.1177/10996362221101139
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Authors:Chao Zhou, Zhuofan Ni, Xinran Zheng, Bo Wang, Rui Li First page: 1883 Abstract: Journal of Sandwich Structures & Materials, Ahead of Print. In this paper, the first attempt is made to obtain some new analytic free vibration solutions of rectangular sandwich panels within the symplectic solution framework, which are difficult to tackle within the conventional analytic solution framework. The sandwich panels with honeycomb and truss cores are first treated as equivalent thick plates. The governing dual equation is then established within the Hamiltonian system. Subsequently, the original problem is converted into two subproblems whose analytic solutions are acquired by applying the variable separation and symplectic eigen expansion. The superposition yields the final analytic free vibration solution, with the emerging coefficients determined according to the equivalence between the original problem and the superposition. The natural frequency and mode shape solutions by the present symplectic superposition method are quantitatively shown via numerical and graphical results, respectively, and are all well validated by consistency with classical solutions, experimental results, or the numerical solutions by the refined finite element modeling. Besides providing the new results that can serve as benchmarks, the effects of the size parameters on the natural frequencies of the sandwich panels are also analyzed. Since the developed method gives up the assumption of any trial solutions and follows a rigorous derivation to yield new analytic solutions, it provides opportunities for solving more intricate problems of sandwich panels and shells. Citation: Journal of Sandwich Structures & Materials PubDate: 2022-06-08T05:56:37Z DOI: 10.1177/10996362221106780
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Authors:Alparslan Solak, Birgül A Temiztaş, Berna Bolat First page: 1905 Abstract: Journal of Sandwich Structures & Materials, Ahead of Print. Sandwich structures are frequently used in structural areas where lightness and strength are essential. These structures are indispensable for sailing boats, and ground and air vehicles. The base purpose of this study is to investigate the effect of wave parameters on the sandwich structure. The data obtained from the bending tests of the model created using Ls-Dyna was compared with the experimental data of the literature. There is a 3.05% difference between the peak force in experimental and Ls-Dyna. The force-deformation plots are coherent, and the progressive images of the sandwich structure during bending are similar. In addition, using theoretical approaches, the highest force and the amount of collapse during bending were determined. There is a difference of 3.1% between the theoretical approach and Ls-Dyna values. Thus, the Ls-Dyna model was validated. The flat cell walls of the honeycomb were modeled as a sine wave. Four wave numbers and wave amplitudes were used. In this way, 16 different analysis files were created. The results show that the new sandwich structure’s specific peak force and specific energy absorption (SEA) increased by 7–110% compared to the ordinary flat walled sandwich structure. This research will assist in the design of new sandwich structures. Citation: Journal of Sandwich Structures & Materials PubDate: 2022-06-14T10:42:47Z DOI: 10.1177/10996362221108973
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Abstract: Journal of Sandwich Structures & Materials, Ahead of Print.
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Authors:Amar Bayat, Gholamhossein Liaghat, Hadi Sabouri, Ghasem Dehghani Ashkezari, Ehsan Pedram, Sayed Ahmad Taghizadeh, Muhammad Kashif Khan, Omid Razmkhah Abstract: Journal of Sandwich Structures & Materials, Ahead of Print.
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Authors:Mohammad Hadi Hajmohammad, Mohammd Sharif Zarei, Reza Kolahchi, Hamed Karami Abstract: Journal of Sandwich Structures & Materials, Ahead of Print.
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