Nonlinear stability and failure analysis of perforated FGM plate

A nonlinear finite element analysis, based on the first-order shear deformation theory and the von-Karman’s nonlinear kinematics, of Ti/TiB FGM plate with a central circular hole under in-plane compressive load has been presented. The volume fractions of FGM constituents (ceramic and metal) have been varied according to simple power law distribution in the thickness direction of FGM plate. The actual non-homogeneous FGM plate with continuously varying properties along thickness has been modeled as a laminate composed of multiple perfectly-bonded layers of isotropic material having layer-wise homogenous composition. The FGM material has been assumed to be graded as per TTO model (i.e., the modified rule of mixtures) to calculate the Young's modulus and the yield strength of FGM plate at a particular thickness coordinate. The failure of the FGM plate has been predicted by applying 3-D von-Mises criterion. After validating the results of present formulation with that reported in the literature, various numerical studies have been conducted to examine the effects of different parameters, viz, material in-homogeneity, slenderness ratio, boundary conditions, hole-size and loading conditions on the bucking and postbuckling behavior, and the failure response of FGM plate. It has been concluded that clamped FGM plate with large hole-size possesses more buckling load than with a small hole-size because of the rigid boundary edge conditions, whereas failure load and associated maximum transverse deflection as well as the postbuckling stiffness of FGM plate monotonically decrease with the increase in hole-size. It has been envisioned that the present study would provide an enhanced insight into the stability and failure behavior of perforated FGM structures

Elastoplastic Stability and Failure Analysis of FGM Plate with Temperature Dependent Material Properties under Thermomechanical Loading

Abstract The present paper explores the stability and failure response of elastoplastic Ni/Al2O3 functionally graded plate under thermomechanical load using non-linear finite element formulation based on first-order shear deformation theory and von-Karman’s nonlinear kinematics. The temperature dependent thermoelastic material properties of FGM plate are varied in the thickness direction by controlling the volume fraction of the constituent materials (i.e., ceramic and metal) with a power law, and Mori-Tanaka homogenization scheme is applied to evaluate the properties at a particular thickness coordinate of FGM plate. The elastoplastic behavior of FGM plate is assumed to follow J2-plasticity with isotropic hardening, wherein the ceramic phase is considered to be elastic whereas the metal is assumed to be elastic-plastic in accordance with the Tamura-Tomota-Ozawa model. Numerical studies are conducted to examine the effects of material and geometrical parameters, viz. material in-homogeneity, slenderness and aspect ratios on the elastoplastic bucking and postbuckling behavior and the failure response of FGM plate. It is revealed that material gradation affects the stability and failure behavior of FGM plate considerably. Furthermore, it is also concluded that FGM plate with elastic material properties exhibits only stable equilibrium path, whereas the elastoplastic FGM plate shows destabilizing response after the ultimate failure point

Nonlinear stability and failure analysis of perforated FGM plate

665-675A nonlinear finite element analysis, based on the first-order shear deformation theory and the von-Karman’s nonlinear kinematics, of Ti/TiB FGM plate with a central circular hole under in-plane compressive load has been presented. The volume fractions of FGM constituents (ceramic and metal) have been varied according to simple power law distribution in the thickness direction of FGM plate. The actual non-homogeneous FGM plate with continuously varying properties along thickness has been modeled as a laminate composed of multiple perfectly-bonded layers of isotropic material having layer-wise homogenous composition. The FGM material has been assumed to be graded as per TTO model (i.e., the modified rule of mixtures) to calculate the Young's modulus and the yield strength of FGM plate at a particular thickness coordinate. The failure of the FGM plate has been predicted by applying 3-D von-Mises criterion. After validating the results of present formulation with that reported in the literature, various numerical studies have been conducted to examine the effects of different parameters, viz, material in-homogeneity, slenderness ratio, boundary conditions, hole-size and loading conditions on the bucking and postbuckling behavior, and the failure response of FGM plate. It has been concluded that clamped FGM plate with large hole-size possesses more buckling load than with a small hole-size because of the rigid boundary edge conditions, whereas failure load and associated maximum transverse deflection as well as the postbuckling stiffness of FGM plate monotonically decrease with the increase in hole-size. It has been envisioned that the present study would provide an enhanced insight into the stability and failure behavior of perforated FGM structures

Elastoplastic Stability and Failure Analysis of FGM Plate with Temperature Dependent Material Properties under Thermomechanical Loading

<div><p>Abstract The present paper explores the stability and failure response of elastoplastic Ni/Al2O3 functionally graded plate under thermomechanical load using non-linear finite element formulation based on first-order shear deformation theory and von-Karman’s nonlinear kinematics. The temperature dependent thermoelastic material properties of FGM plate are varied in the thickness direction by controlling the volume fraction of the constituent materials (i.e., ceramic and metal) with a power law, and Mori-Tanaka homogenization scheme is applied to evaluate the properties at a particular thickness coordinate of FGM plate. The elastoplastic behavior of FGM plate is assumed to follow J2-plasticity with isotropic hardening, wherein the ceramic phase is considered to be elastic whereas the metal is assumed to be elastic-plastic in accordance with the Tamura-Tomota-Ozawa model. Numerical studies are conducted to examine the effects of material and geometrical parameters, viz. material in-homogeneity, slenderness and aspect ratios on the elastoplastic bucking and postbuckling behavior and the failure response of FGM plate. It is revealed that material gradation affects the stability and failure behavior of FGM plate considerably. Furthermore, it is also concluded that FGM plate with elastic material properties exhibits only stable equilibrium path, whereas the elastoplastic FGM plate shows destabilizing response after the ultimate failure point.</p></div

Evaluation of peri-implant parameters and c-reactive protein levels among patients with different obesity levels

Background: Assessment of correlation between peri-implant parameters and C-reactive protein levels among patients with different obesity levels. Materials and Methods: Evaluation of 60 subjects was performed who were scheduled to undergo dental implant therapy for missing mandibular first molars. Three study cohorts were formed, namely, Group A: obese group (BMI between 30 Kg/m2 and 34.9 Kg/m2), Group B: high obese group (BMI over 34.9 Kg/m2), and Group C: non-obese group (BMI under 25 Kg/m2). Each cohort comprised 20 subjects. Dental implant therapy was carried out in all the patients. Peri-implant variables were evaluated in all the patients. Blood samples were obtained, and C-reactive protein levels in subjects having different obesity levels. Statistical analysis was performed using SPSS software. Results: Mean serum C-reactive protein levels among patients of groups A, B, and C occurred to be 3.28 mg/L, 3.65 g/L, and 3.61 g/L, respectively. On comparing numerically, noticeable outcomes were achieved. Mean probing depth among subjects of groups A, B, and C occurred to be 2.9 mm, 3.2 mm, and 1.3 mm, respectively. Mean marginal bone loss among subjects of groups A, B, and C occurred to be 2.1 mm, 2.7 mm, and 0.8 mm, respectively. On comparing numerically, noteworthy outcomes were gathered. Conclusion: There were significantly higher deranged peri-implant inflammatory variables among patients with higher levels of obesity

Revisiting the Effect of Rib Roughness on the Performance of Solar Air Heater

The energy collected from various renewable resources, such as sunlight, geothermal warmth, wind, and water, is referred to as renewable power. The sun is the ultimate source of vitality. Solar radiation vitality can be utilized in many functions, such as heating buildings and dusty foliage crops, dying chicken, wood taste, and treating modern elements. All the energy patterns in nature asking them are the origin of the sun. The solar air heater (SAH) is very common along with commonly applied sun-oriented heating apparatus. Perhaps, SAH is utilized for a wide range of applications, from residential to commercial. Improving the SAH efficiency is done by applying rib elements on the bottom side of the roughness element ribs, grooves, fins, baffles, twisted tapes, deflectors, etc., and improved Thermo-hydraulic performance (THP). Various investigators have prepared several practices in their research work to obtain a greater transfer of thermal energy between these solar collector heaters by applying various rib elements to the absorbent surface. The objective of that study is obliged to describe and conclude tests on the impact of modest rib element height and face projection upon absorber plate along duct surface as artificial rib elements of different shapes on heat transfer along friction factor. The research on artificially roughened SAH ducting is thoroughly analyzed in this paper. The purpose of this paper is to summarize several studies on the thermal and hydraulic performance of synthetically roughened SAH ducting. For the analyzed range of parameters, it was discovered that the usage of arc-shaped-shaped rib geometry and metal grit ribs has the maximum THP parameters in comparison to often roughness geometry. For the tested range of parameters, the use of broken arc ribs has the highest Nu compared to the plain arc-shaped rib roughness. Arc configuration of roughness element exhibits fewer ranges pressure diminishes than the V form design because the produced secondary flow has a curved structure and is rougher

Kcnq1-5 (Kv7.1-5) potassium channel expression in the adult zebrafish

In this article, the authors use the zebrafish genome and potassium channels to study cardiac anomalies, epilepsy, convulsions, hearing loss, and tinnitus in humans

Study of mode II interlaminar fracture toughness of laminated composites of glass and jute fibres in epoxy for structural applications

Composites are being used in the place of metals in many industries as they have a lower density and are cheaper than metals. In aerospace industries there is requirement for light weight together with strength, and reinforced fibre composites are superior in some critical properties compared with metals. In this study, laminated composites were fabricated with woven E-glass and jute fibres in an epoxy matrix by a hand layup method. The samples were prepared as per the relevant the America Society for Testing ad Materials (ASTM) standard and tested for mode II interlaminar fracture toughness to investigate delamination resistance. Mode II interlaminar fracture toughness was evaluated by an end-notched flexure test using three-point bending. The fracture toughness GIIC was calculated for a curing temperature range from 40 ◦C to 70 ◦C at intervals of 5 ◦C for different sets of laminated composites. The investigations revealed that when the curing temperature of laminated composites was increased from 40 ◦C to 70 ◦C, the interlaminar fracture toughness GIIC was increased in neat woven E-glass laminated composites, decreased in neat jute laminated composites, significantly increased in laminated composites with woven E-glass fibres in compression and jute fibres in tension and slightly increased when woven E-glass fibres were kept in tension and jute fibres in compression