scholarly journals Strength and stiffness analyses of standard and double mortise and tenon joints

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 8249-8267
Author(s):  
Seid Hajdarevic ◽  
Murco Obucina ◽  
Elmedin Mesic ◽  
Sandra Martinovic
Keyword(s):  
Bending Moment ◽  
Von Mises Stress ◽  
Elastic Model ◽  
Proportional Limit ◽  
Linear Elastic ◽  
Mortise And Tenon ◽  
Strength And Stiffness ◽  
Experimental Values ◽  
Maximal Moment ◽  
Von Mises

This paper investigated the effect of the tenon length on the strength and stiffness of the standard mortise and tenon joints, as well of the double mortise and tenon joints, that were bonded by poly(vinyl acetate) (PVAc) and polyurethane (PU) glues. The strength was analyzed by measuring applied load and by calculating ultimate bending moment and bending moment at the proportional limit. Stiffness was evaluated by measuring displacement and by calculating the ratio of applied force and displacement along the force line. The results were compared with the data obtained by the simplified static expressions and numerical calculation of the orthotropic linear-elastic model. The results indicated that increasing tenon length increased the maximal moment and proportional moment of the both investigated joints types. The analytically calculated moments were increased more than the experimental values for both joint types, and they had generally lower values than the proportional moments for the standard tenon joints, as opposed to the double tenon joints. The Von Mises stress distribution showed characteristic zones of the maximum and increased stress values. These likewise were monitored in analytical calculations. The procedures could be successfully used to achieve approximate data of properties of loaded joints.

Simulation of Shock Wave Assisted Free and Shape Forming of Metallic Plates in a Shock Tube

2015 ◽  
Vol 813-814 ◽  
pp. 586-591 ◽  
Author(s):  
Kottakota Kalasagarreddi ◽  
Prem Sai Koppuravuri Sobhan ◽  
Vinay Kumar Gundu ◽  
S.R. Nagaraja
Keyword(s):  
Shock Wave ◽  
Shock Tube ◽  
Metal Forming ◽  
Von Mises Stress ◽  
Stress And Strain ◽  
Shock Strength ◽  
Engineering Problems ◽  
Experimental Values ◽  
Von Mises ◽  
Metallic Plates

Due to their complexity, certain engineering problems like finding shock strength, Mach number etc. and the interaction of shock wave with a structure in free and restricted metal forming techniques cannot be achieved in a single experimentation, these can be obtained only through a number of trials and that leads to increase in cost and time. In such cases both cost and time can be reduced by adopting numerical simulations. In this projectcommercial software ANSYS is used to simulate the propagation shock wave through a shock tube, free and shape forming of metallic plates subjected to this shock wave. Shock Mach numbers up to 2.12 have been generated by varying the driver to driven pressure ratios. Thin copper plates of diameter 60mm and thickness of 0.5mm and 0.3mm are subjected to shock wave loadingin order to form into dies.These dies,madeof structural steel are modelled with pre-defined shapes. The plate peakoverpressures ranging from 9 to 20bar have been generated.The midpoint deflection, Von Mises stress and strain are calculated for free forming copper plates. The simulated results are compared with the experimental values available in literature. The simulated results match well with the experimental values.

Comparison of Software for Analysis of Risers Tied Back With Pull Tubes

2016 ◽  
Author(s):  
Feng Wang ◽  
Roger Burke ◽  
Alan Yu
Keyword(s):  
Bending Moment ◽  
General Purpose ◽  
Contact Model ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Riser Pipe ◽  
Software Packages ◽  
Steel Catenary Risers ◽  
Vessel Motion ◽  
Von Mises

Dynamic analysis of steel catenary risers (SCRs) tied back to a Spar through pull tubes has most commonly been performed with the general purpose finite element analysis program ABAQUS, which is generally considered to be most suitable for this type of configuration involving pipe-in-pipe contact between the riser and the pull tube. Version 9.6a and subsequent versions of the riser specific software package OrcaFlex include the capability to handle pipe-in-pipe contact through a line contact model. This model is similar to the contact model in ABAQUS in that it supports relative axial motion and axial friction between the contact lines. A benchmark study is performed to compare riser strength and fatigue performance of the two software packages. The focus of the study is on the pull tube and the riser inside the pull tube, where pipe-in-pipe contact occurs. Bending moment and von Mises stress from the two programs in design storms are found to agree closely. Governing loads on the pull tube guides computed with ABAQUS agree well with the loads computed with OrcaFlex. The two software packages compute similar vessel-motion induced fatigue damage of the bottom of the pull tube (pull tube stress joint). Agreement is not as close for the pull tube above the pull tube stress joint or for the riser pipe. Dynamic run times are comparable between the two programs. Results of the study can assist in the selection of the most suitable software for pull tube riser design and analysis, and in understanding the differences in results from the two software packages.

scholarly journals OPTIMASI DESAIN STENT PLA MENGGUNAKAN METODE RESPONSE SURFACE (RSM) UNTUK MEMPEROLAH FLEKSIBILITAS TERBAIK

2019 ◽  
Vol 8 (1) ◽  
pp. 48
Author(s):  
Sukiman B
Keyword(s):  
Blood Vessel ◽  
Response Surface ◽  
Optimization Design ◽  
Bending Moment ◽  
Von Mises Stress ◽  
Design Parameters ◽  
Angular Change ◽  
Minimum Stress ◽  
Von Mises ◽  
Safety Limit

The stent installation is one of cardiovascular disease treatments which is selected the most to handle patients with blood vessel disease. As the demand for stents increases, more researches are aimed at developing them. This study aims to obtain the optimal link design to produce the best flexibility to the change of stent angle with minimum stress so as not to injure blood vessel plaque. In this study, the stents are polymer stent with different types of links made with PLA materials with strut mirror (S><) design. The study was conducted on two stent configurations, namely crimped and expanded to determine the ability of angular change and maximum stress experienced by both when bending moment applied. The bending moment test was done through simulation based on finite element method in software Abaqus 6.14. The simulation results were then used as a model-making reference to determine the desired optimization design using the help of Minitab 18 software based on the response surface method. The results of this study indicate that the best optimal flexibility on crimped stent L1 to L5, which is the highest flexibility with von mises stress in the safety limit can be obtained based on a combination of link design parameters in the form of bending moment of 0.0074 N.mm with a thickness of 100 μm L3, and 0,0087 N.mm with a thickness of 106 μm L5. While at the expanded stent L1 to L5, the optimal link design parameter value for obtaining the best flexibility with von mises stress within the safety limit is a bending moment of 0.0075 N.mm with a thickness of 63.78 μm L3, 0.0067 N.mm with a thickness of 70 μm L5.

MODELING AND INJURY REPAIR ANALYSIS OF ARTICULAR CARTILAGE BASED ON FIBER CONTENT

2019 ◽  
Vol 19 (08) ◽  
pp. 1940050
Author(s):  
MONAN WANG ◽  
YUANXIN JI ◽  
YUZHENG MA ◽  
JUNTONG JING
Keyword(s):  
Mechanical Properties ◽  
Liquid Phase ◽  
Volume Fraction ◽  
Solid Phase ◽  
Von Mises Stress ◽  
Elastic Model ◽  
Fiber Reinforced ◽  
Element Analysis ◽  
Simulation Results ◽  
Von Mises

It has great guiding significance for the prevention of osteoarthritis and the mechanical state of cartilage after tissue engineering repair to study the relationship between the mechanical properties of cartilage and its structure. This paper considered both the consideration of the solid phase, liquid phase, fiber-reinforced phase in the cartilage and the influence of the contents of major fibers and minor fibers near the cartilage surface. Based on these, a tangential zone of cartilage was established, and a certain improvement and optimization of the fiber-reinforced porous elastic model was performed. The Abaqus software and the Fortran language were used to complete simulation. Simulation results were compared with experiment’s results to verify the validity of the model. Finally, the model was used to perform finite element analysis of different degrees of repairable depth under sliding conditions. Several results were obtained. When the indenter is farther from the interface at the repair site, the mechanical changes in the cartilage are relatively stable. The contact stress of the tangential layer repair and the full-layer repair is small. The volume fraction of the liquid phase in the tangential layer and the full layer repair is lower than that in the other layer regions. The liquid flow rate and the Von Mises stress at the junction of the tangential layer repair are very high. Simulation results were used to explore differences in cartilage mechanical properties of different repairable depths, so as to select the best repairable depth for cartilage.

The Proportional Anisotropic Elastic Invariants

1991 ◽  
Vol 58 (1) ◽  
pp. 50-57 ◽  
Author(s):  
A. M. Sadegh ◽  
S. C. Cowin
Keyword(s):  
Elastic Material ◽  
Hydrostatic Stress ◽  
Von Mises Stress ◽  
Stress And Strain ◽  
Fracture Criteria ◽  
Linear Elastic Material ◽  
Linear Elastic ◽  
Isotropic Elasticity ◽  
Anisotropic Elastic ◽  
Von Mises

There are two proportional invariants for a linear isotropic material, the hydrostatic invariant, and the deviatoric invariant. The former is proportional to the trace of the tensor and the latter is proportional to the trace of the square of the associated deviatoric tensor. The hydrostatic stress and strain and the von Mises stress and strain are directly related to the hydrostatic and deviatoric proportional invariants, respectively, for an isotropic, linear elastic material. For each anisotropic linear elastic material symmetry there are up to six proportional invariants. In this paper we illustrate the six proportional invariants of an orthotropic elastic material using the elastic constants for spruce as the numerical example. The proportional elastic invariants play a role in anisotropic linear elasticity similar to the roles played by the hydrostatic stress and strain and the von Mises stress and strain in isotropic elasticity. They are the unique parameters whose contours represent both the stress and the strain distributions. They also have potential for representing failure or fracture criteria.

Proposed Method to Map the Elastic Follow-Up 3D Distribution Time History Using Finite Element Methods

2021 ◽  
Author(s):  
Michael Breach
Keyword(s):  
Finite Element ◽  
Pressure Vessels ◽  
Elastic Model ◽  
Finite Element Models ◽  
Strain Accumulation ◽  
Linear Elastic ◽  
Linear Elastic Model ◽  
Von Mises ◽  
Over Time

Abstract Elastic follow-up (EFU) is a complex and influencing phenomenon in pressure vessels and piping systems. It affects the performance of structural components at elevated temperatures. Quantification of elastic follow-up is challenging since it’s still not clearly defined in the ASME Boiler & Pressure Vessel Code. Pressure vessels and piping under operating load over time can exhibit mixed elastic follow-up trajectories due to inelasticity. Typically, secondary, and primary load are present at the onset which can redistribute over time due to strain accumulation and stress relaxation during elastic-follow-up. ASME Boiler & Pressure Vessel Code Div. 5, limits strain accumulation via criteria in regions outside of the elastic core. However, a method that directly addresses Elastic follow-up, would be advantageous in establishing actual margins against elastic follow-up during the design phase. The phenomenon has been well studied with various assemblages of uniaxial models, showing load and displacement controlled and mixed responses. This study will present a method of assessing elastic follow up in finite element models. The method is based on the R5 elastic follow-up factor (EFF) expression that has been readily derived in the uniaxial case and employed by authors. Essentially the Von Mises equivalent strains are obtained from both a linear elastic and inelastic 3D finite element models subject to thermal (secondary) and pressure (primary) loading. The linear elastic model establishes the hypothetical initial elastic stress and the inelastic model will map the inelastic response through time. The Von Mises equivalent strains are then substituted into R5 expression, which are obtained from the onset linear-elastic model and the time varying inelastic model to map the elastic follow up and through time. The results are benchmarked against uniaxial results having combined primary and secondary loading.

A Porous Elastic Model for Bacterial Biofilms: Application to the Simulation of Deformation of Bacterial Biofilms Under Microfluidic Jet Impingement

2012 ◽  
Vol 134 (5) ◽  
Author(s):  
Leo Y. Zheng ◽  
Dylan S. Farnam ◽  
Dorel Homentcovschi ◽  
Bahgat G. Sammakia
Keyword(s):  
Porous Medium ◽  
Stress Distribution ◽  
Maximum Shear Stress ◽  
Jet Impingement ◽  
Von Mises Stress ◽  
Bacterial Biofilms ◽  
Internal Diameter ◽  
Elastic Model ◽  
Wide Range ◽  
Von Mises

The presence of bacterial biofilms is detrimental in a wide range of healthcare situations especially wound healing. Physical debridement of biofilms is a method widely used to remove them. This study evaluates the use of microfluidic jet impingement to debride biofilms. In this case, a biofilm is treated as a saturated porous medium also having linear elastic properties. A numerical modeling approach is used to calculate the von Mises stress distribution within a porous medium under fluid-structure interaction (FSI) loading to determine the initial rupture of the biofilm structure. The segregated model first simulates the flow field to obtain the FSI interface loading along the fluid-solid interface and body force loading within the porous medium. A stress-strain model is consequently used to calculate the von Mises stress distribution to obtain the biofilm deformation. Under a vertical jet, 60% of the deformation of the porous medium can be accounted for by treating the medium as if it was an impermeable solid. However, the maximum deformation in the porous medium corresponds to the point of maximum shear stress which is a different position in the porous medium than that of the maximum normal stress in an impermeable solid. The study shows that a jet nozzle of 500 μm internal diameter (ID) with flow of Reynolds number (Re) of 200 can remove the majority of biofilm species.

Strength & Stiffness Estimation for Center Frame of Low-Floor Vehicle

2010 ◽  
Vol 654-656 ◽  
pp. 2664-2667 ◽  
Author(s):  
Yeon Su Kim
Keyword(s):  
Sandwich Structure ◽  
Von Mises Stress ◽  
Regression Equations ◽  
Light Weight ◽  
Vertical Deflection ◽  
Element Analysis ◽  
Aluminum Honeycomb ◽  
Honeycomb Cores ◽  
Strength And Stiffness ◽  
Von Mises

For the designed center frame of low-floor vehicle to have light-weight sandwich structure with glass fabric/epoxy resin skins, aluminum honeycomb cores and steel inner-frames, regression equations for maximum equivalent stresses (Von-Mises stress) and maximum vertical deflection were proposed by finite element analysis. On the basis of the analysis results, the strength and stiffness for the center frame were discussed in this paper.

scholarly journals Mechanical Analysis of Bone-Plate Construct Regarding Strength and Stiffness

2020 ◽  
Vol 23 (1) ◽  
pp. 89-93
Author(s):  
Rana Idan Abed ◽  
Sadiq Jaafer Abbas ◽  
Walead Abd Al-Hasan Alsaadan
Keyword(s):  
Fracture Healing ◽  
Dynamic Compression ◽  
Femoral Shaft ◽  
Shaft Fracture ◽  
Mechanical Analysis ◽  
Bone Plate ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Strength And Stiffness ◽  
Von Mises

The aim of this study was to support surgeons to decide where to place the screws in order to achieve an optimal fracture healing and to prevent implant failure after a femoral shaft fracture So this paper focus on the analysis of bone-plate construct by using Finite element Analysis (FEA), comminuted femur fractured bone fixed with Dynamic Compression Plate (DCP) 16 holes by 4.5 Cortex screws, to investigate the effects of screws configuration on the mechanical behavior of different seven model as Interfragmentary strain which is the most important factor for femur fracture healing. The results state the relationships between the Von-Mises stress, Total deformation and Interfragmentary strain with respect to the screws configuration. The study shows the regions of maximum stress from stress distribution and also founded that we can decrease the Interfragmentary strain by increasing the number of screws.

Sign in / Sign up

Export Citation Format

Share Document