Experimental and numerical investigation of Armox 500T armor steel perforation process

This paper presents the results of an experimental and numerical study of the perforation of Armox 500T armoured steel. The plate perforation was performed with a pneumatic gun using three types of penetrators. Sharp, spherical and blunt penetrators were used. The use of different geometries of penetrators causes the process of perforation and destruction of plates in a different state of stress and strain, which leads to the appearance of three basic modes of failure. Numerical analyses of the perforation process have been carried out using the Ls-Dyna computational code with an advanced constitutive model of the material and the integrated failure model. The obtained experimental and numerical results were analysed and compared. The failure shape, the level of plastic deformation and the parameters of stress and strain state were analysed.

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Numerical Study of Stress-Strain State of Workpiece in Contact Problem of Surface Mandrel Drilling

Science & Technique ◽

10.21122/2227-1031-2021-20-3-259-267 ◽

2021 ◽

Vol 20 (3) ◽

pp. 259-267

Author(s):

N. S. Sivtsev ◽

V. V. Tarasov

Keyword(s):

Plastic Deformation ◽

Friction Coefficient ◽

Contact Interaction ◽

Computational Experiment ◽

Strain State ◽

Numerical Study ◽

Surface Plastic Deformation ◽

Surface Plastic ◽

Stress Strain ◽

Stress Strain State

In recent years, the economic factor has played an increasingly important role in the selection of technologies for manufacturing machine parts with specified values of normalized parameters of geometric accuracy and quality of working surfaces. As applied to surface plastic deformation processes, this is noticeably manifested in the search for effective friction control methods in the “tool – workpiece” pair, which ultimately determines the distribution pattern and the magnitude of stresses and strains in the workpiece and the tool. It is not possible to obtain a rigorous analytical solution to the problem of establishing a connection between surface conditions, friction, and the stress-strain state of the contacted bodies. In this regard, the construction of mathematical models comes to the fore, the solution of which is possible by numerical methods. The paper presents the results of a numerical study (computational experiment) of a finite-element model of workpiece deformation under various conditions of contact interaction and friction by one of the methods of surface plastic deformation – surface mandrel drilling. The friction coefficient has been chosen as the criterion for assessing the conditions of contact interaction and friction. It is shown that a change in the friction coefficient in the process of surface mandrel has no noticeable effect on the formation of a stress field in the deformable workpiece both in the axial, and in the radial and circumferential directions. At the same time, with an increase in the value of the friction coefficient in the “tool – workpiece” pair and with the associated increase in the force of mechanical resistance to deformation of the workpiece, their growth is observed. A computational experiment has confirmed the presence of non-contact deformations of the workpiece and tool during surface mandrel drilling, as well as as a decrease in the value of residual deformations in the workpiece with a decrease in the coefficient of friction. Balance assessment of contact surface displacements in the workpiece (the inner surface of the hole to be machined) and the tool (mandrel) has shown that the deformations of the tool in the elastic region can lead to a significant decrease in the real tightness of surface mandrel drilling.

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Reconstruction Analysis of LH45 Type High Pressure Triplex Plunger Pump Shell

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.595.98 ◽

2014 ◽

Vol 595 ◽

pp. 98-101

Author(s):

Chang Wang ◽

Jing Jing Gao

Keyword(s):

High Pressure ◽

Job Stress ◽

Strain State ◽

Stress And Strain ◽

Plunger Pump ◽

3D Cad ◽

Finite Element Software ◽

State Of Stress ◽

Pump Housing

Due to the corrosion of liquid and dual role of job stress, the pump housing of the LH45 type three cylinder high pressure plunger pump was caused the breakage in the practical work, and its service life was greatly reduced. Studied the pump housing broken state and laws to selected material to manufacture. Established 3D entity of the pump housing model in the 3D CAD software so that the stress and strain state of remade shell can be analyzed using finite element software ANSYS. Compared with the state of stress and strain before shell remaking, the pump housing remaking is proved to be valid.

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The Formation of Adiabatic Shear Band and Analysis of its Characteristics in the Process of Penetration

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.472-475.2846 ◽

2012 ◽

Vol 472-475 ◽

pp. 2846-2849

Author(s):

Jin Quan Li ◽

Sheng Xu Wang

Keyword(s):

Plastic Deformation ◽

Shear Band ◽

Steel Plate ◽

Adiabatic Shear Band ◽

Shear Bands ◽

Adiabatic Shear ◽

Stress And Strain ◽

Adiabatic Shear Bands ◽

Micro Cracks ◽

Armor Steel

The characteristics and causes of the formation of adiabatic shear bands (ASB) in 30CrMnMo armor steel plate are analyzed by shooting 93W projectiles. The results show that adiabatic shear bands do not occur in the initial stages of the opening-crater and plugging. Adiabatic shear bands distributed sparsely appear in the stable penetrating phase because of the necessary strain volume. Adiabatic shear bands are formed along main shear stress lines at an angle of about 450 in relation to the penetrating direction. These are approximately consistent with the direction of the plastic deformation slip line. The non-homogenous deformation and centralizing of stress and strain inside the adiabatic shear band causes micro-cracks and micro-bores during cooling of the plate.

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Effect of pipe expansion on the redistribution of residual stresses after molding

SCIENCE & TECHNOLOGIES OIL AND OIL PRODUCTS PIPELINE TRANSPORTATION ◽

10.28999/2541-9595-2020-10-2-122-126 ◽

2020 ◽

Vol 10 (2) ◽

pp. 122-126

Author(s):

Nikolay A. Makhutov ◽

◽

Dmitry A. Neganov ◽

Eugeny P. Studenov ◽

◽

...

Keyword(s):

Residual Stresses ◽

Strain Distribution ◽

Strain State ◽

Stress And Strain ◽

Cylindrical Shape ◽

Pipe Material ◽

Pipe Expansion ◽

Calculation Results ◽

Residual Deformations ◽

Stress And Strain Distribution

In the factory, pipes for trunk oil and oil product pipelines are obtained by molding and welding. To ensure a cylindrical shape and reduce technological residual stresses, expansion technology is used. Pipe expansion causes a significant change in the values of residual deformations and stresses. The article presents both the calculation results and graphs regarding stress and strain distribution during bending of the stock and their redistribution after expansion. Based on the calculation results, the final total values of residual stresses and residual deformations caused by bending and expansion were stated to be important components of the stress-strain state observed in pipelines being operated under cyclic loading, as well as those used in assessing how degradation affects the ductility of the pipe material. These factors were concluded as being reasonably taken into account when performing verification calculations regarding long-running pipelines if, based on their diagnostics and analysis, their state does not meet modern strength requirements.

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State of stress and strain in a rectangular belt pulled over a cylindrical pulley

Strain ◽

10.1111/j.1475-1305.1973.tb01817.x ◽

1973 ◽

Vol 9 (3) ◽

pp. 104-112 ◽

Cited By ~ 1

Author(s):

A. J. DURELLI ◽

J. BUITRAGO

Keyword(s):

Stress And Strain ◽

State Of Stress

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Numerical study of the stress-strain state of filter dams weakened by low-strength inclusions

Soviet Applied Mechanics ◽

10.1007/bf00886664 ◽

1987 ◽

Vol 23 (8) ◽

pp. 760-765

Author(s):

V. V. Skopetskii ◽

V. S. Deineka ◽

S. I. Rybachishin

Keyword(s):

Strain State ◽

Numerical Study ◽

Stress Strain ◽

Stress Strain State ◽

Low Strength

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Effect of Interfacial Properties on the Mechanical Behavior of Bone-Like Materials: A Numerical Study

International Journal of Applied Mechanics ◽

10.1142/s1758825117500144 ◽

2017 ◽

Vol 09 (01) ◽

pp. 1750014 ◽

Cited By ~ 7

Author(s):

Xingguo Li ◽

Bingbing An ◽

Dongsheng Zhang

Keyword(s):

Mechanical Properties ◽

Plastic Deformation ◽

Numerical Study ◽

Element Model ◽

Interfacial Behavior ◽

Yield Behavior ◽

Bonding Property ◽

The Matrix ◽

Bonding Properties ◽

Superior Mechanical Properties

Interfacial behavior in the microstructure and the plastic deformation in the protein matrix influence the overall mechanical properties of biological hard tissues. A cohesive finite element model has been developed to investigate the inelastic mechanical properties of bone-like biocomposites consisting of hard mineral crystals embedded in soft biopolymer matrix. In this study, the complex interaction between plastic dissipation in the matrix and bonding properties of the interface between minerals and matrix is revealed, and the effect of such interaction on the toughening of bone-like biocomposites is identified. For the case of strong and intermediate interfaces, the toughness of biocomposites is controlled by the post yield behavior of biopolymer; the matrix with low strain hardening can undergo significant plastic deformation, thereby promoting enhanced fracture toughness of biocomposites. For the case of weak interfaces, the toughness of biocomposites is governed by the bonding property of the interface, and the post-yield behavior of biopolymer shows negligible effect on the toughness. The findings of this study help to direct the path for designing bioinspired materials with superior mechanical properties.

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Strain, Stress, and Magnetic Surfaceanisotropy of Epitaxial FE(110)/MO (110) Multilayers

MRS Proceedings ◽

10.1557/proc-317-439 ◽

1993 ◽

Vol 317 ◽

Cited By ~ 1

Author(s):

R.M. Osgood ◽

B.M. Clemens ◽

R.L. White ◽

S. Brennan

Keyword(s):

Strain State ◽

Single Layer ◽

Grazing Incidence ◽

Magnetic Surface ◽

Stress And Strain ◽

Surface Anisotropy ◽

X Ray Diffraction ◽

X Ray ◽

Plane Direction ◽

Strain Stress

ABSTRACTGrazing incidence and asymmetric X-ray diffraction were used to measure the stress and strain state of Fe(110)/Mo(110) Multilayers. The highest stress in the Fe constituent of the multilayer was along the [110] in-plane direction and was due to interaction with the substrate. The Magnetic anisotropy of the Fe Multilayer constituent was measured and the magnetic surface anisotropy, which favored in-plane [001] magnetization, was deduced. In contrast, the magnetic surface anisotropy of a single layer of Fe on W preferred in-plane [110] magnetization, in agreement with the Néel Model.

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