Abstract
In the present paper, a simple quasi-3D integral higher-order beam theory (HBT) is presented, in which
both shear deformation and thickness stretching effects are included for mechanical analysis of advanced composite beams with simply supported boundary conditions, handling mainly bending, buckling, and free vibration problems. The kinematics is based on a novel displacement field which includes the undetermined integral terms and the parabolic function is used in terms of thickness coordinate to represent the effect of transverse shear deformation. The governing equilibrium equations are drawn from the dynamic version of the principle of virtual work; whereas the solution of the problem is obtained by assuming a Navier technique for simply supported advanced composite beams subjected to sinusoidally and uniformly distributed loads. The correctness of the present computational method is checked by comparing the obtained numerical results with quasi-3D solutions found in the literature and with those provided by other shear deformation beam theories. It can be confirmed that the proposed model, which does not involve any shear correction factor, is not only accurate but also simple and useful in solving the static and dynamic response of advanced composite beams.
Key Words
advanced composite beams; kinematics; mechanical analysis; quasi-3D integral HBT
Address
Khaled Bouakkaz and Ibrahim Klouche Djedid: 1) Laboratoire Matériaux et Structures (LMS), University of Tiaret, Algeria, 2) Department of Civil Engineering, University of Tiaret, BP 78 Zaaroura, 14000 Tiaret, Algeria
Kada Draiche: 1) Department of Civil Engineering, University of Tiaret, BP 78 Zaaroura, 14000 Tiaret, Algeria, 2) Material and Hydrology Laboratory, University of Sidi Bel Abbes, Faculty of Technology, Civil Engineering Department, Algeria
Abdelouahed Tounsi: 1) Material and Hydrology Laboratory, University of Sidi Bel Abbes, Faculty of Technology, Civil Engineering Department, Algeria, 2) Department of Civil and Environmental Engineering, King Fahd University of Petroleum & Minerals, 31261 Dhahran, Eastern Province, Saudi Arabia, 3) Department of Civil and Environmental Engineering, Lebanese American University, 309 Bassil Building, Byblos, Lebanon
Muzamal Hussain: Department of Mathematics, Govt. College University Faisalabad, 38000, Faisalabad, Pakistan
Abstract
Several mathematical models describe the compressive behaviour of different types of concretes, but no
specific one for foamed cellular concrete (FCC) has been developed. In this work, simple compression tests on FCC
specimens of different mixes were conducted to study this material's compression behaviour curve until failure. Using continuous load and displacement measurement equipment, it was possible to obtain stress-strain curves up to peak for FCC of different strengths (from 1.20 to 47.34 MPa). Elastic modulus, compressive strength and failure strain values were also determined. Through the analysis of the mentioned curves, a mathematical model of them was obtained, through which it is possible to describe the compression behaviour of FCC up to failure. The comparison between the predicted curve against experimental data shows the effectiveness of the proposed model.
Key Words
experimental campaign; foamed cellular concrete; mathematical model development; porosity; strength prediction model
Address
Computational Mechanics and Structures Research Group (GIMCE), Civil Engineering Department, C. del Uruguay Regional Faculty (FRCU), National Technological University (UTN), Argentina
Abstract
Installing wiring or plumbing fixtures necessitates creating chases within masonry walls, which, while serving practical purposes, raises a crucial concern regarding the potential compromise of the masonry's structural integrity. Given these concerns, it becomes essential to thoroughly understand the impact of incorporating chases on masonry strength. In this study, 37 AAC masonry prisms (200x330x100 mm3) were cast and tested for compression. The prisms were equipped with chases of various depths -10 mm, 20 mm and 30 mm; and orientations (horizontal, inclined, and vertical), which were then filled with mortar using 1:2, 1:4, and 1:6 cement-to-sand ratios. The primary objectives were to assess the strength decrease in the prisms with different chase characteristics compared to a control specimen and to determine the percentage strength increase due to filling materials compared to unfilled chases. Key findings indicate that as chase depth increases, there is a substantial reduction in prism strength. However, the orientation of the chase does not significantly affect strength reduction. Importantly, filling the chases with mortar leads to a significant increase in prism strength. This study not only unveils the complex impact of chase characteristics on masonry strength but also emphasizes the crucial role of filling materials in strengthening these prisms.
Abstract
Hybrid composite materials are widely used in various load-bearing structural components of micro - mini UAVs. However, the design of thin laminates for better impact resistance remains a challenge, despite the strong demand for lightweight structures. This work aims to assess the low-velocity impact (LVI) behaviour of thin quasi isotropic woven carbon/ aramid epoxy hybrid laminates using experimental and numerical techniques. Drop tower impact test with 10 J and 15 J impact energies is performed on carbon/epoxy laminates having aramid layers at different sequences and locations. The impact behaviour is experimentally evaluated using force-time, force-deformation, and energy-time histories considering delamination threshold load, peak load, and laminate deflection. Ultrasonic C-scan is performed on the post-impact samples to analyse the insidious damage profile at different impact energies. The experimental data is further utilized to numerically simulate LVI behaviour by employing the representative volume element model. The numerical results are in good agreement with the experimental data. Numerical and experimental approach predicts that the hybrid laminates with aramid layers at both impact and non-impact sides of the laminate
exhibits significant improvement in the overall impact behaviour by having a subcritical damage morphology compared to carbon/epoxy laminate. A combined numerical-experimental approach is proposed for evaluating the effective impact performance.
Key Words
finite element analysis; hybrid composite; low velocity impact behaviour; micro - mini UAV;
representative volume element
Address
Sojan Andrews Zachariah: 1) Department of Aeronautical and Automobile Engineering, Manipal Institute of Technology,
Manipal Academy of Higher Education, Manipal, Karnataka 576104, India, 2) Department of Operations and Development, Worldwide Oilfield Machine Middle East, P.O. Box 32478, Dubai, United Arab Emirates
Dayananda Pai K, Padmaraj N H and Satish Shenoy Baloor: Department of Aeronautical and Automobile Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka 576104, India
Abstract
The research paper is devoted to study of the thermomechanical deformations occurring in a nonlocal homogeneous isotropic thick circular plate with frequency domain and without energy dissipation. The upper and lower surfaces of the thick circular plate are traction free subjected to axisymmetric heat supply. Hankel transform has been used to find the analytical solutions. The expressions for physical quantities such as displacement components, stress components and conductive temperature have been obtained in the transformed domain. The resulting quantities in the physical domain have been obtained by using the numerical inversion technique. The numerical simulated results have been depicted graphically to study the effect of nonlocality and two temperature on the components of displacement, stress components and conductive temperature.
Key Words
axisymmetric; displacement components; frequency domain; Hankel transform; nonlocality;
stress components; thermoelastic; thick circular plate; two temperature
Address
Sukhveer Singh: Punjabi University APS Neighbourhood Campus, Dehla Seehan, India
Parveen Lata: Department of Mathematics, Punjabi University Patiala, India
