In the present article, the couple stress models in the non-polynomial framework are developed and employed to examine the structural response characteristics of composite micro-plates. The length scale effects in the micro-laminates are considered using the couple stress theory. The trigonometric, inverse-trigonometric, hyperbolic, inverse-hyperbolic and exponential shear shape functions are considered

A mathematical model is developed, though this article, to investigate a vibrational behaviour of functionally graded (FG) cracked microbeam rested on elastic foundation and exposed to thermal and magnetic fields. The model includes a size scale effect and temperature dependent material properties, for the first time. The crack is modelled as a rotating spring, that is connecting the two parts of the

The current article deals with the nonlinear free vibration of nanocomposite circular plates reinforced with graphene platelets (GPL). The functionally graded (FG) plate is considered over a three parameter non-linear elastic foundation. In this research, three types of gradings are assumed for reinforcing the plate by GPLs. The Halpin-Tsai micromechanical rule is exploited to obtain the elastic modulus

Proton exchange membrane fuel cells (PEMFCs) consist of bipolar plates, end plates, membrane electrode assemblies, and gas diffusion layers. Among these components, the bipolar plates (BPs) are the main components because they contribute significantly to the volume, cost, and weight of the PEMFC. Owing to their good electrical and thermal conductivities, graphite and metallic materials are conventional

In the present work, the effect of pre-strain and number of shape memory alloys on the compressive performance of glass/epoxy composite conical shells were studied. The filament-winding process was applied to manufacture the composite specimens, without and with 1 and 2 SMA wires of 0, 1, 2 and 4% pre-strain. Based on the results of the axial compression tests, the maximum stiffness was obtained in

Understanding the effect of local material property fluctuation on the overall structural properties of cellular structures is not only important for more effective designs, but also critical for their adoption in load-bearing applications. In this work, an analytical modeling approach based on direct stiffness method was adopted, which allows for the implementation of heterogeneous material imperfection

The accurate design-oriented model for concrete confined with fiber-reinforced polymer (FRP) is important to provide safe design of this composite system. In this paper, the response surface model (RSM) is coupled with support vector regression (SVR) for developing a novel hybrid model, namely RSM-SVR, with the aim of predicting the ultimate condition of FRP-confined concrete. Predictions obtained

In this paper, a new semi-analytical approach based on the scaled boundary finite element method (SBFEM) is proposed to solve buckling problem of functionally gradient material (FGM) sandwich beams. Material properties of each individual layer are assumed to be continuously graded along the thickness according to a power law function with respect to the volume fractions. Based on the layer-wise theory

This paper describes the effects of various laser patterns on as-received 22MnB5 tubes for selective local strengthening. It has been confirmed that strengthened cross-sectional areas, perpendicular to the axial direction by laser patterning, and uniform strength distributions between the as-received and strengthened area can induce the concertina mode under axial crushing. The auxetic and helical

One of the most frequent and catastrophic problems encountered in reinforced concrete (RC) structures is failure due to shear deficiency in RC structures, especially in RC beams. Thus, in the scope of this experimental study, the effectiveness of using prefabricated ultra-high performance fiber-reinforced concrete (UHPFRC) laminates in the form of plate or strip for shear strengthening was investigated

A non-smooth tension-compression asymmetric constitutive law has important applications in modelling of bio-composite structures with a unilateral contact behavior and no-tension/compression structures. Quadratic programming algorithms based on Parametric Variational Principle (PVP) have good numerical robustness on this kind of issue. However, the challenge of computational cost prevents its application

This paper presents an analysis of the performance of different existing formulations to quantify the FRP contribution to the shear strength of RC elements strengthened in shear by externally bonded FRP sheets. A large database of 555 tests has been assembled distinguishing between the shape of the section, the existence of internal transverse reinforcement and the FRP configurations. In general, predictions

Automated fiber placement (AFP) is an important process used for fabrication of composite structures. Path planning is one of the important steps in the process of AFP. The rationality of the path is directly related to the quality of the composites component. However, the generation of the placement path is constrained by a variety of factors, including geometry characteristics of curved surface,

The relatively low strength and brittleness are believed to be two main factors restricting the widely use of coal reject concrete (i.e. CRC) in practical applications. This paper presents a concept of the novel FRP-confined hybrid concrete column to provide an alternative method to widen the use of CRC. The systematic compression tests on natural aggregate concrete (i.e NAC) and CRC with a large replacement

Glulam columns and beams are structural wood engineering products, which are formed by gluing the timbers together in parallel with the help of glue and are widely used in the construction of wood structures. Steel plates, aluminum plates or simply wooden parts are commonly used at the joints of wood structures. Steel elements that are often used as joints can corrode and also aluminum plates are not

The dynamical analysis of two directional functionally graded carbon nanotube reinforced composite (2DFG-CNTRC) plates are studied for various boundary conditions. The effects of the CNT distribution in the two directions on the dimensionless frequencies are investigated and compared with the unidirectional CNT distributions (1DFG-CNTRC) with respect to the variation of the CNT configuration, volume

This paper aims to investigate the buckling and post-buckling analyses of composite cellular beams. For this, the numerical model is calibrated by experimental tests via post-buckling analysis. A parametric study is developed, considering six cross sections. For each section, the opening diameter and web post length are varied. Regarding the buckling analyses for the symmetrical sections, it was concluded

Herein, in the present review we developed and investigated a comprehensive review of advanced composite materials based on thermoplastic polymers, elastomer polymers and thermosetting polymers. These advanced composite materials were reinforced by organic and/or inorganic fibers and formulated using various fillers such as organic, mineral and metallic. Further, we present the development and the

This paper presents two artificial intelligence techniques (e.g., gene expression programming (GEP) and random forest (RF)) for predicting the bond strength of near-surface-mounted (NSM) fiber-reinforced polymer (FRP) strips or rods bonded to concrete. Experimental data from 145 direct pullout tests collected from the literature and five parameters, namely, the bond length, FRP axial rigidity, groove

Steel plate bolted connections are frequently used in timber structures. However, these connections may incur durability problem due to the corrosion of the steel plates. This paper proposes using GFRP plate to replace steel plate in timber connections to mitigate the corrosion issue. The group effect of the proposed GFRP-timber bolted connection is studied. Tensile tests of GFRP-timber bolted connections

This work deals with the damping capability of an actively constrained viscoelastic particulate composite (VEPC) layer in attenuation of vibration of a beam element. The overall beam is composed in the layered form where VEPC layer is constrained between the substrate beam and extension actuated piezoelectric layer. The VEPC layer is a graphite particle-filled viscoelastic composite layer and its effective

Seven reinforced concrete (RC) T-beams, comprising two unstrengthened (control) beams and five beams strengthened in shear with embedded FRP bars, were tested to failure. The test parameters were steel-to-FRP shear reinforcement ratio and tension reinforcement ratio. A nonlinear finite element (FE) model was developed, validated and used to conduct parametric studies. The experimental and FE results

Corrugated cardboard presents small geometries that make unfeasible the use of detailed three-dimensional numerical models, though homogenization approaches can be used to define equivalent homogenous plate models at a macro-mechanical scale. In this paper, we performed a finite element analysis of a well-known chair design, originally made of honeycomb cardboard, but replacing this material with single-

An innovative experimental methodology for the nondestructive assessment of local elastic properties of composite materials is proposed in this paper. A local region of rectangular shape is isolated on the investigated laminate with a proper clamping system. The first resonant frequency of the retained region with clamped boundaries is determined through the Impulse Excitation Technique. In order to

In-situ Micro X-ray computed tomography (μCT) offers a new opportunity to monitor the 3D morphology and damage evolution of short carbon fiber-reinforced polymer (SCFRP) composite. However, the sample size of in-situ μCT is generally limited to achieve high revolution, which resulted in different mechanical behavior compared with that obtained from standard samples. In this study, μCT scans with two

The effect of temperature during impact on the compression after impact behavior of carbon/epoxy composite sandwich panels with Nomex honeycomb core is investigated. Impact tests were performed at room temperature, −70 °C, and −150 °C, while compression after impact tests on the damaged panels are performed at room temperature in order to isolate the effect of temperature during impact on the residual

The present study investigates the effects of machining parameters and the tool coating during drilling of a GLARE® hybrid aerospace material on the cutting forces, hole quality and the generation of harmful dust particles. The drilling tests were conducted using twist drills with diamond-like carbon (DLC), Cristall coating and without coating. Obtained results indicate that feed, in contrast to spindle

In order to solve the problem of poor damage resistance of foam, limited thickness of ordinary spacer fabric and complex preparation process of composite, a high-distance spacer fabric/foam composite (HFFC) was designed via a simple and rapid method without molds. The HFFC was composed of two polyvinyl chloride (PVC) faces and a foam-filled high-distance spacer fabric core. Nine kinds of high-distance

In this paper, we have studied the influence of the panel thickness on the underwater impact resistance performance of the pyramid lattice structure based on the SPH-FEM method. Firstly, a benchmark case is simulated and compared with the experimental results to verify the accuracy of SPH-FEM for fluid-structure interaction (FSI) problems. Then, the dynamic response of the pyramid lattice structure

Metallic hollow spheres and polyurethane resin are excellent sound insulation and sound absorption materials. In this study, the surface modified 316L stainless steel hollow spheres were added into polyurethane by casting method. The influence of the volume fraction and diameter of the hollow spheres on the sound insulation and sound absorption performance of the Metallic-Hollow-Sphere/Polyurethane

Mineral-based composites are presented as a real alternative to the use of Fiber Reinforced Polymer (FRP) composites. However, most studies have focused only on the global mechanical behavior of the mineral-based composites. The objective of this paper is to develop a 3D numerical model in order to predict global and local tensile behavior of glass yarn/ettringitic matrix composites. Two configurations

Thin-ply laminated composites have recently gained increasing attention in the aerospace engineering field, due to enhanced design possibilities and positive size effects with regard to decreasing ply thickness. In this paper, the mechanical behavior of thin-ply laminate and TC21 titanium alloy hybrid joints with double-lap bolted structure under quasi-static loading was studied experimentally. X-ray

The present study reports the response of composite laminates under high velocity impact by fragments. A numerical model is developed to simulate a hostile scenario of impact of fragments after their interaction with a blast wave to study the response of cross ply laminates. The composite laminates are modelled using a progressive damage model having a string of failure criteria and damage variables

This study examines the diffusion of water in fiber-reinforced polymer (FRP) laminated composites, comprising epoxy resin and unidirectional glass fibers, at different material and structural scales. Experiments on the diffusion of neat resin, FRP laminas in the axial and transverse fiber directions, FRP laminated composites with different stacking sequences, and FRP plates, rods, and pipes are conducted

Results of investigation of buckling behaviour of an orthotropic composite plate resting on elastic orthotropic foundation with nonlinear change of transverse displacement over the thickness, using the Ritz method are reported in the paper. The foundation has the form of a parallelepiped with the fully fixed bottom plane. A model of the foundation, linking its transverse displacement with the plate

The paper is concerned with failure analysis of composite shells performed with the usage of the nonlinear 6-parameter shell theory with drilling rotation degree of freedom. This special theory embodies naturally unlimited translations and rotations and is suitable for analysis of irregular shells for instance with various, particularly orthogonal, intersections. The presence of the drilling rotation

Compared with flat laminates, curved composite laminates are more susceptible to wrinkle defects which must be considered in the design and structural integrity assessment. Combined experimental testing and numerical simulations were carried out in this paper to investigate the influence of wrinkles on the failure behavior of L shaped laminates. Special lay-up and forming processes were used to generate

With utilizing of the wearable electronics in daily life, the energy harvesting problem of the electronic devices has become an urgent problem. In this paper, the dynamic behaviour of the energy harvester, which is constructed by bonding piezoelectric ribbons on a pre-strained compliant substrate, is investigated. Taking the geometrical nonlinearity into account, and by using the extended Lagrange

In this study, carbon fiber-reinforced plastic (CFRP)/Al laminates are made through autoclave cocuring. Three-point bending, stamping bending, and micromorphology analyses are conducted to study the failure of FMLs in the bending process and the influences of fiber direction, metal thickness ratio, and temperature on springback. Results show that the fiber direction exerts a great influence on the

The Voronoi-based random honeycomb cylindrical shell with specific mesostructures was constructed programmatically and additively manufactured on material of polylactide (PLA). Then, a new PLA random honeycomb-filled double circular tube (PLA-RHFDCT) was proposed. The mechanical performance of the PLA-RHFDCTs in terms of deformation mode, crushing response and energy absorption was studied experimentally

Concrete slab on grade homes are being increasingly elevated above the base flood elevation for mitigation of coastal and inland flooding. This is typically accomplished through placing additional beam and pier supports under a raised slab home. In this process, the slab support conditions are changed from uniform soil support to beam supports. This may lead to unanticipated stress/strain changes,

This study investigates the compression after impact (CAI) behavior of carbon-fiber foam-core sandwich composites in low temperature arctic conditions. Low-velocity impact and CAI tests are experimentally conducted across temperature from −70 °C to 23 °C. Results show higher compressive strength for non-impacted specimens at low temperature. However, upon impact, severe damage and complex failure modes

A new strain energy-based method for homogenization of 2-D and 3-D cellular materials is developed using an extended version of Hill’s Lemma for the non-Cauchy continuum satisfying the micropolar elasticity theory. Both kinematic and mixed boundary conditions (BCs) that obey the Hill-Mandel condition are identified. The newly proposed method requires that the nodal equilibrium equations be explicitly

An experimental investigation is presented into improving the maximum load limit and other structural properties of T-shaped laminate joints by through-thickness weaving of thin metal filaments. Preforms of carbon fibre T-joints are first woven using continuous metallic or fibrous filaments made of copper, steel or carbon fibre yarns and then infused with epoxy. Stiffener pull-off tests performed on

The originality of this paper is the study of the bending behavior of several carbon-fiber-reinforced thermoplastic sandwich composites under three-point bending tests using a mechanical-acoustic experimental coupling approach. The skins were fabricated from thermoplastic Polyphenylsulfone “PPSU” resin reinforced by 2x2 twill desized carbon fabrics. Different core materials (Nomex, Aluminum and Polyetherimide

This paper presents the first attempt to investigate the mechanical behaviors of the three-dimensional theory of poroelasticity for functionally graded graphene platelets reinforced composite (FG-GPLRC) open-shell resting on a non-polynomial viscoelastic substrate involving friction force and under residual stresses. For this purpose, three parameters viscoelastic foundation is developed by taking

This study investigated the cyclic compressive behavior of mortar reinforced with dog-bone-shaped and crimped SMA fibers. Both types of SMA fibers were made of cold-drawn NiTi SMA wires with 1.0-mm diameter. The fibers’ characteristics of tensile behavior and recovery stress were investigated before they were embedded in cement mortar. For cyclic compressive testing, plain mortar and reinforced mortar

Automated fiber placement (AFP) is widely used to manufacture composite lightweight structures in different industries, including aerospace. Prepreg tackiness plays an important role in the AFP process. This study aims to measure the prepreg tackiness at different AFP processing conditions and predict the optimum parameters for high tackiness levels. Two in-house setups were developed for layup and

In the presented paper, the phenomenon of failure of axially compressed thin-walled composite structures with channel shape was analysed. The tested thin-walled structures were made of CFRP composite using the autoclave method. In the research, experimental tests on actual columns and advanced numerical calculations using the finite element method were conducted. The numerical calculations were carried

This work investigates the mechanism of bonding and the influence of the process parameters during Friction Assisted Joining of aluminum alloy AA7075 with carbon fiber reinforced PolyPhenylene Sulfide. Laser texturing was performed on the aluminum surface to promote mechanical interlocking between the metal and reinforced plastic substrates. The influence of the tool rotation speed, the plunging force

R-curve and traction-separation relation are commonly used to characterize the fiber bridging, which is significant toughening mechanism in composite laminates. Current investigations are mainly focused on unidirectional laminates. However, the dependence of the R-curve and traction-separation relation on the stacking sequence is still lack of comprehensive studies. Here, the effect of stacking sequence

In this work, multi-scale finite element analyses based on three-dimensional (3D) hybrid macro/micro-scale computational models subjected to various loading conditions are carried out to examine the in-situ effect imposed by the neighboring plies on the failure initiation and propagation of cross-ply laminates. A detailed comparative study on crack suppression mechanisms due to the effect of embedded

This paper discourses an overview of the recent advancements in functionally graded materials (FGMs) research. The paper also disseminates on the key researches that are carried out in the scientific community on the development of manufacturing and modelling of functionally graded materials. The rationale of the current work is to emphasize the selection of materials, processing techniques and analytical

Thrust force is the most influential factor to the frequent-occurred drill-exit damages in the drilling of carbon fiber reinforced polymer/plastic (CFRP). The accurate prediction of this thrust force is of great importance for drilling process optimization to suppress these damages. However, the thrust force in drilling CFRP is strongly coupled with rapid tool wear which brings significant challenges

The aim of the study is to present a complex phenomenon of damage in thin-walled composite structures with an top-hat cross-section subjected to axial compression. Actual structures were prepared using the auto-clave technique (CFRP composite). Research was conducted in a full range of load – until construction damage. In the case of experimental testing both post-critical equilibrium paths and acoustic

The fatigue damage of composite sandwich panels is divided into two parts: the face sheet damage and the core damage. Both the two kinds of damage cause the performance degradation of panels, however only the core damage results in the ultimate failure. In this paper, a fatigue damage model of the face sheet and the core is proposed and three-point bending tests are carried out to obtain the deflection

In the current investigation, a surface elastic-based three-dimensional (3D) nonlinear formulation is provided to explore the thermal postbuckling characteristics of porous composite nanoplates made of a functionally graded material (FGM) having a central cutout with different shapes. The surface stress factors are taken into the formulation by choosing the Gurtin-Murdoch theory of elasticity within

Adhesive durability and joint reliability, strictly related to the bonding agents, are key parameters still under evaluation in civil as well as in other engineering fields. Moisture, different environmental agents and temperature (in particular) can strongly affect the performance of the adhesive joints over the time limiting their applicability. The environmental temperature may exceed the glass