METHODS FOR DETERMINING THE MECHANICAL CHARACTERISTICS OF MATERIALS USING INDENTATION (review)

2021 ◽  
pp. 104-118
Author(s):  
E.I. Oreshko ◽  
◽  
V.S. Erasov ◽  
N.O. Yakovlev ◽  
D.A. Utkin ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Computational Methods ◽  
Mechanical Characteristics ◽  
Element Model ◽  
Hardness Values

The paper considers the main methods for determining the hardness of materials. The basic formulas for calculating the mechanical characteristics of materials by hardness values are presented. The analysis of methods for calculating tensile diagrams of materials by indentation diagrams is carried out. Approaches to building a finite element model of material indentation are considered. The paper shows the need to improve existing standards and develop computational methods with a detailed description of techniques for recalculating indentation diagrams into mechanical characteristics of materials.

THE EQUIPMENT FOR DEFINITION OF PHYSICOMECHANICAL CHARACTERISTICS OF MATERIALS BY PRESS-IN METHOD (review)

2021 ◽  
pp. 107-124
Author(s):  
E.I. Oreshko ◽  
◽  
V.S. Erasov ◽  
D.A. Utkin ◽  
Ya.V. Avtayeva ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Computational Methods ◽  
Mechanical Characteristics ◽  
Element Model ◽  
Physicomechanical Characteristics ◽  
Definition Of ◽  
Hardness Values

The article considers the main methods for determining the hardness of materials. The basic formulas for calculating the mechanical characteristics of materials by hardness values are presented. The analysis of methods for calculating tensile diagrams of materials by indentation diagrams is carried out. The paper considers the approaches to building a finite element model of material indentation The need to improve existing standards and develop computational methods is shown with a detailed description of techniques for recalculating indentation diagrams into mechanical characteristics of materials.

FINITE ELEMENT ANALYSIS OF THE MECHANICAL CHARACTERISTICS OF GLAUCOMA

2016 ◽  
Vol 16 (04) ◽  
pp. 1650060 ◽  
Author(s):  
PEISHAN DAI ◽  
HAN HAN ◽  
YALI ZHAO ◽  
MIN FAN
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Optic Nerve ◽  
Finite Element Model ◽  
Mechanical Characteristics ◽  
Element Model ◽  
Finite Element Method Result ◽  
Element Analysis ◽  
Human Eye ◽  
Geometry Model

Purpose: Construct a finite element model of the human eye to quantitatively analyze the mechanical characteristics of the human eye, especially the glaucoma damage process of the optic nerve head (ONH). Method: First, the geometry model of the human eye with nonuniform thickness was established based on a reasonable hypothesis and assumptions. Because the ONH is an important factor for glaucoma, we refine the structure of the ONH with lamina cribrosa. Then, mesh division was applied for finite element analysis. To simplify the complexity of the analysis, the materials of the model were assumed to be isotropic linear elastic materials, and physical properties such as Young’s modulus and Poisson’s ratio were set according to published literature. Next, proper constraints and loads were applied to the model and solved with a finite element method. Result: A finite element model of the human eye was created to simulate the mechanical characteristics of the eye structures under high intraocular pressure (IOP). The ONH depressed 1.057[Formula: see text]mm under 0.009[Formula: see text]MPa pressure to simulate high IOP. Conclusion: The constructed model is able to quantitatively simulate excavation of the optic disc and damage of the optic nerve. The result proved Houcheng Liang’s hypothesis about the ONH damage mechanism in glaucoma.

Effects of missing fasteners on the mechanical behavior of double-lap, multi-row composite bolted joints

2018 ◽  
Vol 52 (28) ◽  
pp. 3919-3933
Author(s):  
Fujian Zhuang ◽  
Puhui Chen
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Load Distribution ◽  
Mechanical Characteristics ◽  
Joint Stiffness ◽  
Element Model ◽  
Bolted Joints ◽  
Explicit Finite Element ◽  
Single Column ◽  
Failure Loads

This paper presents a numerical investigation into the effects of missing fasteners on the mechanical characteristics of double-lap, multi-row composite bolted joints. A highly efficient explicit finite element model, which was validated effective and accurate by experiments, was developed and employed to conduct the virtual tests. Single-column and multi-column joints with various positions of missing fastener were considered. It is shown that the removal of fasteners can reduce the joint stiffness significantly, especially in joints with fewer columns or missing fasteners in the outside rows. The removal of fasteners can also cause considerable reductions in both the initial significant failure loads and ultimate loads of multi-column joints, while in single-column joints only the initial significant failure loads are influenced. Considering the load distribution, it is suggested that bolts in the same column as or in the adjacent column to the missing fastener experience a notable growth in load. Meanwhile, if a bolt bears more loads in the pristine joint, the larger changes in stiffness, ultimate strength, and load distribution may be obtained when it is lost.

Structural Design and Analysis on Frame of Blueberry Harvesters Based on ANSYS

2010 ◽  
Vol 26-28 ◽  
pp. 794-799
Author(s):  
Qian Wang ◽  
Zhi Peng Li ◽  
Dao Qiang Wang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Static Analysis ◽  
Working Conditions ◽  
Structural Design ◽  
Mechanical Characteristics ◽  
Element Model ◽  
Frame Structure ◽  
Ansys Software ◽  
The Finite Element Model

The frame of blueberry harvesters is quite different from other vehicles. In this article, the design for whole frame structure is elaborated. According to the mechanical characteristics of the frame, materials are selected and manufacturability requirements are limited. Based on PRO/E software, accurate model of the frame of blueberry harvesters is established. And then, on the basis of ANSYS software, the finite element model of frame of blueberry harvesters is established to carry out static analysis on full-loaded and distortion working conditions. Results meet the strength requirements and displacement requirements, so it verifies the reasonableness of the design of frame.

scholarly journals Finite Element Analysis of Mechanical Characteristics of Dropped Eggs Based on Fluid-Solid Coupling Theory

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Song Haiyan ◽  
Wang Fang ◽  
Zhang Jianguo ◽  
Zhang Yinong ◽  
Yang Shugang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Mechanical Characteristics ◽  
Structural Parameters ◽  
Element Model ◽  
Coupling Theory ◽  
Element Analysis ◽  
Internal Fluid ◽  
Drop Impacts ◽  
Protective Packaging

It is important to study the properties and mechanics of egg drop impacts in order to reduce egg loss during processing and logistics and to provide a basis for the protective packaging of egg products. In this paper, we present the results of our study of the effects of the structural parameters on the mechanical properties of an egg using a finite element model of the egg. Based on Fluid-Solid coupling theory, a finite element model of an egg was constructed using ADINA, a finite element calculation and analysis software package. To simplify the model, the internal fluid of the egg was considered to be a homogeneous substance. The egg drop impact was simulated by the coupling solution, and the feasibility of the model was verified by comparison with the experimental results of a drop test. In summary, the modeling scheme was shown to be feasible and the simulation results provide a theoretical basis for the optimum design of egg packaging and egg processing equipment.

Finite Element Simulation of Tire-Rim Interface

1989 ◽  
Vol 17 (4) ◽  
pp. 305-325 ◽  
Author(s):  
N. T. Tseng ◽  
R. G. Pelle ◽  
J. P. Chang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Finite Element Simulation ◽  
Contact Pressure ◽  
Element Model ◽  
Experimental Measurements ◽  
Inflation Pressure ◽  
Interference Fit ◽  
Element Simulation ◽  
Rubber Composite

Abstract A finite element model was developed to simulate the tire-rim interface. Elastomers were modeled by nonlinear incompressible elements, whereas plies were simulated by cord-rubber composite elements. Gap elements were used to simulate the opening between tire and rim at zero inflation pressure. This opening closed when the inflation pressure was increased gradually. The predicted distribution of contact pressure at the tire-rim interface agreed very well with the available experimental measurements. Several variations of the tire-rim interference fit were analyzed.

Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

1996 ◽  
Vol 24 (4) ◽  
pp. 339-348 ◽  
Author(s):  
R. M. V. Pidaparti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Rubber Belt ◽  
Steel Cord ◽  
Torsional Analysis

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

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