Abstract
The buckling mode of failure is very common in case of plates, especially when their aspect ratio is large. In the present study, an endeavour has been made to carry out the hygro-thermal-induced buckling-based study of sandwich functionally graded (FG) plates made up of different material variation laws. A comparative study has been carried out between FGM plates made up of power, exponential and sigmoidal law using higher order zigzag theory. Nine-noded C-0 finite element has been used. It has been observed that the buckling behaviour of sandwich FGM plates under hygrothermal conditions is widely influenced by the geometry of the plate and the value of the law coefficient. Also, the nature of boundary condition widely affects the behavior of the plate.
Key Words
buckling; finite element; HOZT; hygro-thermal; stress continuity
Address
Aman Garg: State Key Laboratory of Intelligent Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China/ Department of Multidisciplinary Engineering, The NorthCap University, Gurugram, Haryana, India – 122017
Mohamed-Ouejdi Belarbi: Laboratoire de Recherche en Génie Civil, LRGC, Université de Biskra, B.P. 145, R.P. 07000, Biskra, Algeria/ Department of Civil Engineering, Lebanese American University, Byblos, Lebanon
Li Li: Department of Multidisciplinary Engineering, The NorthCap University, Gurugram, Haryana, India – 122017
H.D. Chalak: Department of Civil Engineering, National Institute of Technology Kurukshetra, Haryana, India – 136119
Abdelouahed Tounsi: Department of Civil and Environmental Engineering, King Fahd University of Petroleum &Minerals, 31261 Dhahran, Eastern Province, Saudi Arabia/ Material and Hydrology Laboratory, University of Sidi Bel Abbes, Faculty of Technology, Civil Engineering Department, 22000 Sidi Bel Abbes, Algeria/ YFL (Yonsei Frontier Lab), Yonsei University, Seoul, Korea
A.M. Zenkour: Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia/ Department of Mathematics, Faculty of Science, Kafrelsheikh University, Kafrelsheikh, Egypt
Abstract
This study aims to investigate the effect of incorporating waste glass powder (WGP) and quarry waste sand (QWS) on the properties of eco-friendly self-compacting mortar (SCM). Ordinary cement was replaced with WGP at rates of 0%, 10%, 20% and 30% by weight and the properties of the QWS-based SCM are compared to those of natural sand (NS)-based SCM. In this study, slump flow, superplasticizer requirement, mechanical strength, rheological parameters and hydration heat were investigated. The results obtained show that the use of WGP with different types of sand mixtures increases the fluidity of the SCM. After curing, SCM with 10% WGP exhibited higher compressive and flexural strengths after 28 days for both type of sand. The best performance was obtained with SCM mixes prepared with QWS sand compared to that of NS sand. Adequate relationships have been established to predict slump flow and mechanical strengths as a function of test parameters with high correlation coefficient and low root mean square error.
Address
Abdelkarim Korteby: Geomaterial Laboratory, University Hassiba Benbouali of Chlef, 02000, Chlef, Algeria/ Civil Engineering Department, University Center of Tipaza, 42000, Tipaza, Algeria
Karim Ezziane and Mhamed Adjoudj: Geomaterial Laboratory, University Hassiba Benbouali of Chlef, 02000, Chlef, Algeria
Abstract
A modified Shear-lag model and variational approach were used to predict the effect of the crack density on stiffness degradation for [
Key Words
desorption; hygrothermal effect; stiffness reduction; transverse cracking; Tsai model
Address
Mohamed Khodjet-kesba, and B. Boukert, A. Benkhedda: Aeronautical Sciences Laboratory, Aeronautics and space studies Institute, University of Blida1, Algeria
E.A. Adda bedia: Materials and Hydrology Laboratory, University of Sidi Bel Abbes, Algeria
Abstract
In this study, the performance of polyvinyl butyral interlayered friction stir welded (PVBFSWed) and ultrasonic vibration-assisted friction stir welded (UVaFSWed) AA7075-T651 joints are investigated, considering the effect of tool rotation and welding speed. The joints' tensile strength, microhardness, microstructure, and fracture behavior are evaluated. The UVaFSWed joints showed better performance compared to the PVBFSWed joints. The highest tensile strength of 322.8 MPa and microhardness of 157 Hv in weld nugget is observed for the UVaFSWed joint at a tool rotation of 2000 rpm and welding speed of 40 mm/min. However, the lowest surface roughness of 7.98
Abstract
The adhesive bonding technique has become widely prevalent in recent years, especially in fields such as engineering, aerospace, and sports. During operational service, adhesives are subjected to severe environmental conditions, including temperature variations, humidity, and UV radiation, which can impact their performance. In this study, we utilized the mechanical properties of the aged epoxy adhesive Adekit A140 in a finite element model to assess the impact of temperature and water absorption on the degradation of mechanical properties in metal-metal adhesive joints used in aeronautical structures. Our primary objective was to analyze, using the finite element method, the influence of these environmental factors on the joint's strength by evaluating the distribution of Von Mises stresses. The adhesive's mechanical properties, such as Young's modulus (E), were measured at different immersion periods and then integrated into the numerical modeling. The results revealed that water absorption leads to a significant degradation of the adhesive's mechanical properties, primarily manifested as a reduction in Young's modulus. Despite this degradation, an increase in plasticity was observed, which surprisingly improved the overall strength of the bonded assembly under certain conditions. Notably, after 90 days of immersion, the joint's strength demonstrated a 15% reduction in stiffness but exhibited enhanced durability due to plastic deformation, indicating a potential trade-off between stiffness and durability in long-term service. This provides valuable insight into the design of adhesive joints under varying environmental conditions.
Key Words
degradation; temperature; metal/metal adhesive joints; Von Mises stress; water absorption
Address
Ait Kaci Djafar: Laboratory LMPM, University of Sidi Bel Abbes, BP 89, City Ben Mhidi, Sidi Bel Abbes 22000, Algeria/ University of Sidi Bel Abbes, BP 89, City Ben Mhidi, Sidi Bel Abbes 22000, Algeria
Zagane Mohammed El Sallah and Moulgada Abdelmadjid: Laboratory LMPM, University of Sidi Bel Abbes, BP 89, City Ben Mhidi, Sidi Bel Abbes 22000, Algeria/ University of Tiaret, Department of Mechanical Engineering, city Zaâroura BP 78, Tiaret 14000, Algeria
Benouis Ali: Laboratory LMPM, University of Sidi Bel Abbes, BP 89, City Ben Mhidi, Sidi Bel Abbes 22000, Algeria
Madani Kouider: University of Sidi Bel Abbes, BP 89, City Ben Mhidi, Sidi Bel Abbes 22000, Algeria
Zahi Rachid: University of Relizane, 48000, Algeria
