scholarly journals Experimental and finite element study of the effect of temperature and moisture on the tangential tensile strength and fracture behavior in timber logs

Holzforschung ◽  
2014 ◽  
Vol 68 (1) ◽  
pp. 133-140 ◽  
Author(s):  
Finn Larsen ◽  
Sigurdur Ormarsson
Keyword(s):  
Finite Element ◽  
Tensile Strength ◽  
Fracture Behavior ◽  
Maximum Stress ◽  
Climatic Conditions ◽  
Effect Of Temperature ◽  
Modeling And Experiments ◽  
Temperature Levels ◽  
Increasing Temperature ◽  
Good Agreement

Abstract Timber is normally dried by kiln drying, in the course of which moisture-induced stresses and fractures can occur. Cracks occur primarily in the radial direction due to tangential tensile strength (TSt) that exceeds the strength of the material. The present article reports on experiments and numerical simulations by finite element modeling (FEM) concerning the TSt and fracture behavior of Norway spruce under various climatic conditions. Thin log disc specimens were studied to simplify the description of the moisture flow in the samples. The specimens designed for TS were acclimatized to a moisture content (MC) of 18% before TSt tests at 20°C, 60°C, and 90°C were carried out. The maximum stress results of the disc simulations by FEM were compared with the experimental strength results at the same temperature levels. There is a rather good agreement between the results of modeling and experiments. The results also illustrate the strong decrease of TSt with increasing temperature at a constant MC level.

scholarly journals Vibrations of a deformed half-space with inclusion under the influence of surface waves

2021 ◽  
Vol 274 ◽  
pp. 03027
Author(s):  
Bakhodir Rakhmonov ◽  
Ismoil Safarov ◽  
Mukhsin Teshaev ◽  
Ravshan Nafasov
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Concentration ◽  
Surface Waves ◽  
Strain State ◽  
Maximum Stress ◽  
Harmonic Waves ◽  
The Finite Element Method ◽  
Seismic Impacts ◽  
Good Agreement

There is a large number of underground tunnels of various shapes located in seismic zones that need to be protected from seismic impacts. The paper considers the effect of harmonic surface waves on a cylindrical inclusion of various shapes located in a viscoelastic half-plane. The main purpose of the study is to determine the stress-strain state of the obstacle when exposed to harmonic waves. The problem is solved by the finite element method. It was found that the maximum stress concentration is allowed at long waves, and the stress concentration with increasing depth and wavelength approaches the static value of stress. The reliability of the obtained research results is confirmed by good agreement with theoretical and experimental results obtained by other authors.

scholarly journals Static and Harmonic Analysis of Winch Shaft using FEM

2020 ◽  
Vol 9 (3) ◽  
pp. 1286-1290
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Harmonic Analysis ◽  
Maximum Stress ◽  
Theoretical Calculations ◽  
Maximum Displacement ◽  
Fundamental Frequencies ◽  
Heavy Loads ◽  
Mathematical Relations ◽  
Good Agreement

It is not easy to lift the heavy loads with bare ropes or other components. Winches are very useful for various mechanical applications. In this present work, winch shaft is designed and analysed using Finite Element Method (FEM). Catia and Nastran programs are used for the modelling and analysis. Static and Harmonic analysis are carried out on the winch shaft. In static analysis the maximum displacement induced is .009817 mm, hence based on Rigidity, and stresses in Z-direction are observed to be 0.122E -0.7 mm and 158.731 N/mm2 respectively. The maximum stress and fundamental frequencies found are 119.009 MPa and 143.98 Hz. The deflection value from theoretical calculations is 0.013 mm. The mathematical relations are used for the validation of the analysis and found good agreement

scholarly journals Finite Element Analysis and Experimental Study of Metal Shell of GIL

2021 ◽  
Vol 252 ◽  
pp. 02042
Author(s):  
Gong Mimi ◽  
Zhao Yantao ◽  
Fu Jiajia ◽  
Luo Changlu ◽  
Sun Mingdao ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Finite Element ◽  
Maximum Stress ◽  
Water Pressure ◽  
Environmental Safety ◽  
Metal Shell ◽  
Element Analysis ◽  
Safety Requirements ◽  
Finite Element Numerical Simulation ◽  
Good Agreement

Mathematical modeling, finite element numerical simulation and experimental measurement of the stress-deformation distribution of the gas-insulated metal-enclosed transmission line shell were carried out. Also, Stress linearization analysis was used to analyze the maximum stress. The results show that the stress is linearly dependent on water pressure and the shell occurs elastic deformation without plastic deformation. The simulated maximum stress of 76.2MPa is fairly in good agreement with the measured one (69.9MPa). The stress linearization analysis results show that the shell well satisfies the environmental safety requirements. The experimental results are consistent with the finite element results.

Finite element simulation and experimental investigation on the effect of temperature on pseudoelastic behavior of perforated Ni–Ti shape memory alloy strips

2021 ◽  
Author(s):  
Emre Altas ◽  
Farshid Khosravi Maleki ◽  
Hasan Gokkaya ◽  
Vahid Arab Maleki ◽  
Yüksel Akınay ◽  
...  
Keyword(s):  
Finite Element ◽  
Shape Memory ◽  
Element Model ◽  
Effect Of Temperature ◽  
Flexural Stiffness ◽  
Temperature Dependent ◽  
Three Point Bending ◽  
Increasing Temperature ◽  
The Finite Element Model ◽  
Pseudoelastic Behavior

Abstract In the present study, the temperature-dependent pseudoelastic behavior of shape memory alloy sheets is studied experimentally and by finite element modeling. For this purpose, temperature-dependent mechanical properties for Ni-Ti alloy materials are first obtained by using direct tensile and three-point bending experiments at 23, 50, and 80 °C temperatures, respectively. The structure of these materials is examined at different temperatures using SEM images and the XRD test. Furthermore, using the finite element model, the pseudoelastic behavior and the effect of temperature on the residual deflection of the prose-shape memory strips with a circular hole under three-point bending loads are studied. After validating the results of the finite element model with the results of experimental tests, the effects of various parameters such as the diameter and number of holes on residual deformation and residual strains are investigated. The results show that with increasing temperature, the mechanical properties including the tensile strength, Young's modulus, yield stress, and flexural strength of SMA strips increase significantly. For solid strips, although increasing the temperature increases the maximum flexural force, in contrast, it reduces the flexural stiffness. In solid strips, flexural stiffness decreases by 5.5% with increasing temperature from 23 °C to 80 °C.

scholarly journals CHROMATOGRAPHIC, RHEOLOGICAL AND CYTOCHEMISTRY EVALUATION OF “BACURI” PULP (Platonia insignis MART.)

2014 ◽  
Vol 32 (1) ◽  
Author(s):  
ANDRÉA CARDOSO DE AQUINO ◽  
CÍCERO DE SOUZA LIMA ◽  
FILIPE XAVIER FEITOSA ◽  
MARIA IZABEL GALLÃO ◽  
GUSTAVO ADOLFO SAAVEDRA PINTO ◽  
...  
Keyword(s):  
Shear Rate ◽  
Rheological Behavior ◽  
Physicochemical Characterization ◽  
Effect Of Temperature ◽  
Rheological Measurements ◽  
Cytochemical Analysis ◽  
Linalool Oxide ◽  
Increasing Temperature ◽  
Good Agreement ◽  
Newtonian Behavior

“Bacuri” pulp was evaluated for volatile compounds, rheological behavior, and cytochemical analysis. The pulp was also submitted to physicochemical characterization. The effect of temperature on rheological behavior of whole “bacuri” pulp was investigated in this work. The rheological measurements were carried out using a Brookfield Rheometer (Model DV-II +) at shear rate range from 0.25 to 1.50 s-1 at temperatures of 30, 40, 50, 60 and 70 °C. A total of 36 compounds were detected in the headspace of the “bacuri” pulp - 34 of which were identified. The major compounds were the following: linalool, cis-linalool, trans-linalool oxide, and hotrienol, respectively. The experimental data was adjusted using a power law rheological model, with good agreement. “Bacuri” pulp shows a non-Newtonian behavior, with an apparent viscosity decreasing with increasing temperature. The “bacuri” pulp obtained activation energy at shear rate 1.50 s-1 was -14.03 kJ/mol.

Investigation on the Tensile Strength of GLARE Laminate with a Hole

2014 ◽  
Vol 1052 ◽  
pp. 358-366 ◽  
Author(s):  
Gui Min Qu ◽  
Bo Ru Li ◽  
Li Zhao ◽  
Xiao Feng Li
Keyword(s):  
Finite Element ◽  
Tensile Strength ◽  
Tensile Load ◽  
Element Model ◽  
Analysis Model ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
Glass Fiber Reinforced ◽  
The Finite Element Analysis ◽  
Good Agreement

As for the case of tensile plastic deformation of glass fiber reinforced aluminum laminates (GLARE), the finite element analysis model of the tensile strength of GLARE laminates with a hole is established by means of ABAQUS software under tensile load. The modeling is found to be in good agreement between the simulation results and the experiment data in the failure strength. On the basis of the finite element model, the tensile strength of GLARE laminates containing a hole in other ply modes is simulated, and the influences of the hole size and ply angle on the tensile strength are given in this paper.

Experimental and Numerical Fracture Modeling Using XFEM of Aluminum Plates

2020 ◽  
Vol 46 ◽  
pp. 45-52 ◽  
Author(s):  
Ali Taghezout ◽  
Bendouba Mostefa ◽  
Abdelkader Djebli ◽  
Aid Abdelkarim ◽  
Habib Khellafi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Modeling ◽  
Finite Elements ◽  
Fracture Behavior ◽  
Plane Elasticity ◽  
Study Materials ◽  
Fracture Modeling ◽  
Aluminum Plates ◽  
Good Agreement

In this paper a numerical modeling was carried out to study the problem of plane elasticity in a medium cracked by the method of the extended finite elements (XFEM) in a thin cracked plate made of aluminum using the software Abaqus 6.13.This method improved the capability of the classical finite element method especially the crack propagation problems. Furthermore, the extended finite elements method has been used to simulate tensile and fracture behavior of the study materials. Based on variation in size and shape of crack, the results obtained will be compared with those obtained experimentally, this comparison shows a good agreement.

The Effect of Temperature on the Tensile Properties of Steel 0Cr18Ni9

2010 ◽  
Vol 654-656 ◽  
pp. 194-197
Author(s):  
Wei Fen Li ◽  
Wei Niu ◽  
Zhi Ming Hao ◽  
Ming Hai Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Yield Strength ◽  
Tensile Properties ◽  
Tensile Testing ◽  
Testing Machine ◽  
Effect Of Temperature ◽  
Tensile Testing Machine ◽  
Increasing Temperature

Experiments of tensile mechanical properties of steel 0Cr18Ni9 are done on the MTS 810 tensile testing machine, and the temperature range is from 20°C to 1200°C. The stress vs. strain curves are obtained. Results show that the elastic modulus, yield stress and tensile strength decrease with increasing temperature .Based on the experiment results, the functions of the elastic modulus, yield strength and tensile strength versus temperature are represented by polynomial.

Oil Palm Fibre and Nano-Silica Reinforced Epoxy Composite Material

2014 ◽  
Vol 980 ◽  
pp. 23-27
Author(s):  
Ng Samuel ◽  
D. Sujan ◽  
M.E. Rahman ◽  
O. Nabinejad ◽  
M. Mohan Reddy
Keyword(s):  
Finite Element ◽  
Tensile Strength ◽  
Composite Material ◽  
Oil Palm ◽  
Epoxy Composites ◽  
Element Analysis ◽  
Epoxy Material ◽  
Oil Palm Fibre ◽  
Palm Fibre ◽  
Good Agreement

This paper presents a study on tensile properties of Nano Silicon Carbide (n-SiC) and oil palm fibre (OPF) reinforced epoxy composites. The dosage of n-SiC and OPF are limited to 0%, 1%, 3% & 5% by mass of the total epoxy material. As a part of the research, experimental study is carried out on n-SiC and OPF based epoxy composites to investigate the tensile strength of the composite material. The utilization of 1% n-SiC& 1% treated OPF shows an improvement in tensile strength compared to the pure epoxy. The experimental results are also compared with 3-D finite element analysis results and a good agreement is observed between the experimental and the finite element results.

Modeling of Mechanical Behavior of Porous Sintered Timing Wheel in Contact with Chain Wheels

2007 ◽  
Vol 561-565 ◽  
pp. 1649-1652
Author(s):  
M. Alizadeh ◽  
H. Khorsand ◽  
Ali Shokuhfar
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Finite Element ◽  
Tensile Strength ◽  
Mechanical Behavior ◽  
Sintered Density ◽  
Fem Model ◽  
Gear Contact ◽  
The Relationship ◽  
Good Agreement

The mechanical properties of sintered timing wheel in contact with chain wheels were analysed using Finite Element Methods (FEM), in which the timing wheel is modelled as a metal powder. The mechanical properties of sintered timing wheel were investigated as a function of sintered density. Tensile strength and Young’s modulus increased with a decrease in porosity. Current methods of calculating gear contact stresses use Hertz’s equations, which were originally derived for contact between sintered timing wheel and chain wheels. The results of the 2D dimensional FEM analyses from ANSYS are presented. The relationship between relative density of P/M steels and mechanical behavior is also obtained from FEM and compared with the experimental data. Good agreement between the experimental and FEM results is observed, which demonstrates that FEM can capture the major features of the P/M steels behaviour during loading. This indicates that the FEM model is accurate.

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