scholarly journals Stress and Strain Analysis of Plywood Seat Shell

2019 ◽  
Vol 70 (1) ◽  
pp. 51-59
Author(s):  
Seid Hajdarević ◽  
Murčo Obućina ◽  
Elmedin Mešić ◽  
Sandra Martinović
Keyword(s):  
Stress Analysis ◽  
Strain Analysis ◽  
Wood Products ◽  
Orthotropic Materials ◽  
Stress And Strain ◽  
Elastic Model ◽  
Layer By Layer ◽  
Element Analysis ◽  
Experimental Stress Analysis ◽  
Linear Elastic

In this paper, the stress and strain analysis of common laminated wood seat shell is performed. Experimental stiffness evaluation is conducted by measuring displacement of the point on the backrest, and experimental stress analysis is carried out by tensometric measuring at the critical transition area from the seat to the backrest. Finite element analysis is carried out layer by layer with a “2D linear elastic model” for orthotropic materials. Good matching is found between numerical and experimental results of displacement. It is also shown that the results of the principal stress in the measurement points of the seat shell compare favourably with experimental data. The applied in-plane stress analysis of each individual veneer is not applicable for interlaminar stress calculations that are a significant factor in curved forms of laminated wood. Curved forms of laminated wood products require more complex numerical analysis, but the method can be used to achieve approximate data in early phase of product design.

Simulation of stress and strain analysis on a delimbing knife with replaceable cutting edge

BioResources ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 3799-3808
Author(s):  
Ján Melicherčík ◽  
Jozef Krilek ◽  
Pavol Harvánek
Keyword(s):  
Finite Element Method ◽  
Stress Analysis ◽  
Cutting Force ◽  
Woody Plants ◽  
Strain Analysis ◽  
Cutting Edge ◽  
Stress And Strain ◽  
Cutting Knife ◽  
Basic Parameters

This study focused on stress and strain analysis of the cutting force of a branch knife with a replaceable cutting edge. The replaceable edge forms part of the delimbing head, which is applied to the arms of a mechanical harvester working in forestry. Basic parameters of the knife and head of the harvester with the basic calculations necessary to determine the number of knives based on input parameters, such as wood diameter, woody plants, and determination of the cutting force acting on the cutting knife, were examined. Based on the cutting force and the design of the special cutting knife, a stress analysis and a finite element method (FEM) was performed. This study confirmed the correctness of the selected material to produce the delimbing knife, which was designed using a replaceable cutting edge. The output of the stress analysis is reported.

scholarly journals Experimental Stress Analysis of Fixed Partial Dentures by Use of a Dynamic Method

1971 ◽  
Vol 50 (2) ◽  
pp. 422-429 ◽  
Author(s):  
E.W. Tillitson ◽  
R.G. Craig ◽  
F.A. Peyton
Keyword(s):  
Stress Analysis ◽  
Dynamic Method ◽  
Gold Alloy ◽  
Model System ◽  
Stress And Strain ◽  
Experimental Stress ◽  
Partial Denture ◽  
Experimental Stress Analysis ◽  
Fixed Partial Denture

Using a model system replicating the size of a fixed partial denture, stress and strain analyses were made of chromium-nickel and gold alloy restorations.

Stress and Strain Analysis of Composite Gas Cylinder Based on ABAQUS

2012 ◽  
Vol 557-559 ◽  
pp. 300-303
Author(s):  
Cheng Hong Duan ◽  
Xiang Peng Luo ◽  
Nan Zhang
Keyword(s):  
Finite Element ◽  
Strain Analysis ◽  
Element Model ◽  
Stress And Strain ◽  
Analysis Method ◽  
Element Analysis ◽  
Finite Element Software ◽  
Finite Element Analysis Method ◽  
Gas Cylinder ◽  
Gas Cylinders

In this paper, a finite element model of a composite gas cylinder was established by ABAQUS finite element software, with consideration that both heads were helically wound and their wound angle and wound thickness varied with different parallel circle radius. Stress of the composite gas cylinder and PEEQ of its liner under different working conditions after autofrettage treatment were studied, the stress distribution was assessed by the DOT CFFC standard and the effective range of autofrettage treatment was confirmed. This finite element analysis method may be referable to the design and inspection of composite gas cylinders.

Brain Tissue Fragility–A Finite Strain Analysis by a Hybrid Finite-Element Method

1975 ◽  
Vol 42 (2) ◽  
pp. 269-273 ◽  
Author(s):  
S. N. Atluri ◽  
A. S. Kobayashi ◽  
J. S. Cheng
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Strain ◽  
Strain Analysis ◽  
Stress And Strain ◽  
Exposed Surface ◽  
Element Analysis ◽  
Hybrid Finite Element Method ◽  
Hybrid Finite Element

This paper deals with the finite-strain, finite-element analysis of the states of stress and strain in the vicinity of a blunt indenter applied to the exposed surface of the pia-arachnoid of an anesthetized rhesus monkey.

scholarly journals Thermomechanical finite element analysis of hot water boiler structure

2012 ◽  
Vol 16 (suppl. 2) ◽  
pp. 387-398 ◽  
Author(s):  
Dragoljub Zivkovic ◽  
Dragan Milcic ◽  
Milan Banic ◽  
Pedja Milosavljevic
Keyword(s):  
Thermal Stresses ◽  
Coefficient Of Thermal Expansion ◽  
Strain Analysis ◽  
Nonlinear Effects ◽  
Hot Water ◽  
Reference Object ◽  
Isotropic Hardening ◽  
Stress And Strain ◽  
Element Analysis ◽  
Object A

The paper presents an application of the Finite Elements Method for stress and strain analysis of the hot water boiler structure. The aim of the research was to investigate the influence of the boiler scale on the thermal stresses and strains of the structure of hot water boilers. Results show that maximum thermal stresses appear in the zone of the pipe carrying wall of the first reversing chamber. This indicates that the most critical part of the boiler are weld spots of the smoke pipes and pipe carrying plate, which in the case of significant scale deposits can lead to cracks in the welds and water leakage from the boiler. The nonlinear effects were taken into account by defining the bilinear isotropic hardening model for all boiler elements. Temperature dependency was defined for all relevant material properties, i. e. isotropic coefficient of thermal expansion, Young?s modulus, and isotropic thermal conductivity. The verification of the FEA model was performed by comparing the measured deformations of the hot water boiler with the simulation results. As a reference object, a Viessmann - Vitomax 200 HW boiler was used, with the installed power of 18.2 MW. CAD modeling was done within the Autodesk Inventor, and stress and strain analysis was performed in the ANSYS Software.

Experimental Stress Analysis of Cast In Situ Concret Roof-Slab under Indirect Load of Variable Temperature

2011 ◽  
Vol 368-373 ◽  
pp. 3676-3681 ◽  
Author(s):  
Sheng Guo Ding ◽  
Ting Ding ◽  
Qi Wen Li ◽  
Ze Ming Wang
Keyword(s):  
Experimental Data ◽  
Stress Analysis ◽  
Variable Temperature ◽  
Scale Model ◽  
Stress And Strain ◽  
Experimental Stress ◽  
Experimental Stress Analysis ◽  
Roof Plate ◽  
Typical Time

An electrical experiment on the full-scale model is conducted. Distribution of temperature stress and strain for the cast-in-site concrete roof slab during typical time of extreme weather in the winter and the summer are obtained. Cracking mechanism of cast-in-situ concrete roof is revealed preliminary. Contrasting of the experimental data between the green roof and bare plate roof plate ,it is expounded that planting roof can reduce temperature difference and average variable temperature for the roof slab significantly.

Stress and Strain Analysis of Waste Dam and Stability Analysis of Landfill

2015 ◽  
Vol 744-746 ◽  
pp. 702-705 ◽  
Author(s):  
Li Hua Liang ◽  
Su Lin Kuang ◽  
Zhi Jun Diao
Keyword(s):  
Strain Analysis ◽  
Material Model ◽  
In Situ Stress ◽  
Stress And Strain ◽  
Linear Elastic ◽  
Construction Design ◽  
Dam Stability ◽  
The Stability ◽  
In Situ Stress Field

Stress and strain of waste dam were analyzed based on the construction design and situations in the field. In situ stress field was calculated according to linear elastic material model and deformation was simulated according to hyperbolic nonlinear plastic model. On the basis of the deformation and stress analysis, dam stability was evaluated according to the deformation by total stress method. The result shows that the stability of the dam can meet the specification requirements and be operated normally even if the deformation occurs when solid waste are heaped up to 0-12 m according to the preliminary design scheme.

Stress-strain Analysis of Premolars With Non-carious Cervical Lesions: Influence of Restorative Material, Loading Direction and Mechanical Fatigue

2017 ◽  
Vol 42 (3) ◽  
pp. 253-265 ◽  
Author(s):  
AC Machado ◽  
CJ Soares ◽  
BR Reis ◽  
AA Bicalho ◽  
LHA Raposo ◽  
...  
Keyword(s):  
Strain Gauge ◽  
Composite Resin ◽  
Strain Analysis ◽  
Lithium Disilicate ◽  
Stress And Strain ◽  
Cervical Lesions ◽  
Element Analysis ◽  
Mechanical Fatigue ◽  
Biomechanical Behavior ◽  
Resin Core

SUMMARYNoncarious cervical lesions (NCCLs) are characterized by a loss of dental structure at the cementoenamel junction (CEJ) caused by stress, biocorrosion, and attrition. Variations in occlusal loading can promote different stress and strain patterns on the CEJ. Restoration of NCCLs is part of lesion management; however, there is still no conclusive restorative protocol for NCCLs. This study aimed to evaluate the stress and strain distribution of maxillary premolars with NCCLs according to three factors: 1) restorative technique; 2) direction of occlusal loading; and 3) mechanical fatigue. Three-dimensional (3D) finite element analysis (FEA) and strain gauge testing were used to assess stress and strain, respectively. 3D-FEA orthotropic, linear, and elastic models were generated: sound tooth (SO); unrestored NCCL; or NCCL restored with glass ionomer; flowable composite resin; nanofilled composite resin (CR); lithium disilicate ceramic; and nanofilled composite resin core associated with a lithium disilicate laminate (CL). A 150-N compressive static load was applied in two conditions: axially in both cusps (Al); and at a 45° angle to the long axis of the tooth applied to the palatine cusp (Ol). For the experimental tests, specimens were treated as described previously, and one strain gauge was attached to the buccal surface of each tooth to record tooth strains before and after cyclic loading (200,000 cycles, 50 N). FEA showed that the association of NCCL and Ol resulted in higher stress values. CR and CL restorations showed the closest biomechanical behavior to SO for both loading types. Loaded Al or Ol specimens showed higher strain values after mechanical fatigue. Lower stress and strain were observed with Al when compared with Ol. The restoration of NCCLs with composite resin only or associated with ceramic laminates seems to be the best approach because the results for those groups were similar in biomechanical behaviors to sound teeth.

Finite-Element Analysis and Optimization for Gradient Porous Structure of Artificial Bone

2012 ◽  
Vol 271-272 ◽  
pp. 922-926 ◽  
Author(s):  
Yan Mei Qi ◽  
Li Jun Yang ◽  
Li Li Wang
Keyword(s):  
Mechanical Properties ◽  
Porous Structure ◽  
Equivalent Stress ◽  
Strain Analysis ◽  
Equivalent Strain ◽  
Stress And Strain ◽  
Artificial Bone ◽  
Element Analysis ◽  
Maximum Equivalent Stress ◽  
Ansys Workbench

The loading force of the artificial bone implanted into the human body and the flowing, growth and deposition of cells were influenced by the gradient porous structure. The software of ANSYS Workbench was used in the paper for the stress and strain analysis of the gradient porous structure of the established 3D artificial bone. The variation of the maximum equivalent stress and maximum equivalent strain and elastic modulus changed through the changing of the loading force and porosity. Basis on meeting the mechanical properties, the porosity was used as the index for the optimization of the porous structure of the artificial bone. And it also laid the foundation for the subsequent laser sintering.

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