Residual stresses in metal rolled with application of ultrasonic vibrations

1971 ◽  
Vol 13 (1) ◽  
pp. 74-75
Author(s):  
V. P. Severdenko ◽  
A. V. Stepanenko ◽  
I. V. Zayash ◽  
P. S. Ovchinnik�v
Keyword(s):  
Residual Stresses ◽  
Ultrasonic Vibrations

scholarly journals CALCULATION ON THE STRENGTH OF DEFORMING ELEMENTS AND DEVELOPMENT OF FIRMWARE STRUCTURES FOR ULTRASOUND PROCESSING

2021 ◽  
pp. 135-144
Author(s):  
Volodymyr Rutkevych ◽  
Vitaliy Kushnir
Keyword(s):  
Tensile Strength ◽  
Residual Stresses ◽  
Thermal Stresses ◽  
Ultrasonic Vibrations ◽  
Acoustic Parameters ◽  
Considerable Decrease ◽  
A Value ◽  
Acoustic Contact ◽  
Force Characteristics ◽  
Metal And Alloys

The possibility of increasing the efficiency and expanding the technological capabilities of the process of deforming drawing, by studying the contact phenomena and force characteristics of the process of deforming drawing (flashing) with the imposition of ultrasonic vibrations on the tool. The main advantages of deforming drawing with application of ultrasound are noted, among which it is necessary to allocate considerable decrease in force parameters of process, reduction of level of residual stresses, increase of accuracy of the processed details. Also, the application of ultrasound allows you to process parts made of metal and alloys, the processing of which in normal conditions is impossible and requires special techniques. It is noted that it is not possible to use known designs of broaches and firmware when flashing with the application of ultrasonic vibrations, because the firmware must have all the dimensions related to the acoustic parameters and the deforming element must be placed on the mandrel with tension to create good acoustic contact between the mandrel and the element. Prefabricated deforming firmware for processing holes with the imposition of longitudinal ultrasonic vibrations has been developed and a method for calculating their deforming elements for strength has been proposed. The performed calculations showed that the calculated stresses differ from the allowable ones by no more than 15-20 %. From the above calculations it is seen that the deforming element can be destroyed, both under the action of the working load in the process of flashing, and under the action of thermal stresses after the exit of the element from the machined hole. This difference in the results of research can be explained by the fact that the order of tensile strength is a value that has a large scattering zone and in different studies it is different. The results of research on the strength of deforming elements can be used in engineering calculations in the design of prefabricated tools for drawing holes with ultrasound.

FE Modelling of Residual Stresses and Validation Using Chip-Mechanism and Microstructural Analysis of Ultrasonic Vibration Assisted Turning of Ti Alloy Ti-6Al-4V

2014 ◽  
Vol 597 ◽  
pp. 257-261
Author(s):  
Sandip Patil ◽  
Digvijay Sheed ◽  
Rajkumar Singh
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Cutting Tool ◽  
Microstructural Analysis ◽  
Residual Stress Distribution ◽  
Ultrasonic Vibrations ◽  
Fe Modelling ◽  
Ultrasonic Assisted ◽  
Cutting Velocity

Ultrasonic assisted turning (UAT) is a novel manufacturing technology, where high frequency vibrations are imposed on the movement of a cutting tool. A 2D FE transient simulation is developed in DEFORM, where ultrasonic vibrations of frequency 20 kHz and amplitude of 20 μm are provided to the cutting tool in the direction of cutting velocity. The prediction of residual stress distribution is carried out using elasto-plastic finite element simulations. Experimental analysis is carried out in measuring the strain at the cutting tool during CT and UAT along with the chip mechanism and chip microstructure study to validate the residual stress distribution. The ultrasonic vibrations yield a considerable improvement in compressive residual stresses which ultimately benefits in improving fatigue life of titanium alloys.

The Study of Ultrasonic Relaxation of Residual Stresses of Metal Plates Using Computer Simulation

2018 ◽  
Vol 284 ◽  
pp. 1367-1372
Author(s):  
Albert Viktorovich Korolev ◽  
A.F. Balaev ◽  
A.A. Korolev
Keyword(s):  
Computer Simulation ◽  
Residual Stresses ◽  
Residual Strain ◽  
High Efficiency ◽  
Geometric Parameters ◽  
Analytical Models ◽  
Vibrational Amplitude ◽  
Ultrasonic Vibrations ◽  
Elastic Plates ◽  
Technological Parameters

To stabilize the geometric parameters of the elastic plates during production, the "aging" method is used, which has low performance, and as an alternative to which the method of ultrasonic stabilization is developed. The essence of ultrasonic stabilization is to create the elastic strain applied via the static load in the central part of the plate by the tool, and to communicate ultrasonic vibrations, which lead to the relaxation of residual stresses and stabilization of the geometric parameters of the plate. Analytical expressions are obtained in order to calculate technological parameters of the ultrasound processing. Computer simulation was held on the basis of the theoretical and analytical models, which has allowed to identify and to visualize the dependence of residual stress and plate deformation on the duration and amplitude of ultrasonic vibrations. On the basis of the obtained dependences it was found that the vibrational amplitude should be reduced to reduce the residual strain, however this increases the processing time. Thus, the greater the amplitude of the ultrasonic vibrations is, the more intense the reduction of residual stresses is. Intensive changes of the residual strain and stresses in the first few seconds are characterized by high efficiency of ultrasonic stabilization, which is recommended as a replacement for the aging method.

Technology of Residual Stresses Relaxation by the Ultrasonic Vibrations

2015 ◽  
Vol 770 ◽  
pp. 66-69 ◽  
Author(s):  
Albert V. Korolev ◽  
Andrew A. Korolev ◽  
A.S. Jakovichin ◽  
S.A. Savran ◽  
A.F. Balaev ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Residual Stresses ◽  
Liquid Medium ◽  
Thermal Stabilization ◽  
Geometrical Parameters ◽  
Ultrasonic Vibrations ◽  
New Techniques ◽  
Special Machine ◽  
Bearing Rings

The paper studies the effectiveness of new techniques of stabilizing the geometrical parameters of bearing rings in comparison with the thermal stabilization. Processing of bearing rings is made on a special machine in a liquid medium where the ultrasonic vibrations are excited. It is shown that roundness of the rings after ultrasonic stabilization is substantially lower than after the heat treatment.

Method to evaluate residual stresses in the laser cutting process

2002 ◽  
Vol 12 (1) ◽  
pp. 27-41 ◽  
Author(s):  
Y. Zamachtchikov ◽  
F. Breaban ◽  
P. Vantomme ◽  
A. Deffontaine
Keyword(s):  
Residual Stresses ◽  
Laser Cutting ◽  
Cutting Process

Prediction of residual stresses and springback after bending of a textured aluminium plate

2003 ◽  
Vol 105 ◽  
pp. 175-182 ◽  
Author(s):  
L. Delannay ◽  
R. E. Logé ◽  
Y. Chastel ◽  
P. Van Houtte
Keyword(s):  
Residual Stresses

Theoretical study of the prestressing strand's stress by computer modeling methods

2020 ◽  
Vol 76 (11) ◽  
pp. 1139-1148
Author(s):  
A. G. Korchunov ◽  
E. M. Medvedeva ◽  
E. M. Golubchik
Keyword(s):  
Residual Stresses ◽  
High Strength ◽  
Pearlitic Steel ◽  
Internal Stresses ◽  
Steel Microstructure ◽  
Compressive Stresses ◽  
Wide Range ◽  
Prestressing Strands ◽  
Increasing Temperature ◽  
Wire Strand

The modern construction industry widely uses reinforced concrete structures, where high-strength prestressing strands are used. Key parameters determining strength and relaxation resistance are a steel microstructure and internal stresses. The aim of the work was a computer research of a stage-by-stage formation of internal stresses during production of prestressing strands of structure 1х7(1+6), 12.5 mm diameter, 1770 MPa strength grade, made of pearlitic steel, as well as study of various modes of mechanical and thermal treatment (MTT) influence on their distribution. To study the effect of every strand manufacturing operation on internal stresses of its wires, the authors developed three models: stranding and reducing a 7-wire strand; straightening of a laid strand, stranding and MTT of a 7-wire strand. It was shown that absolute values of residual stresses and their distribution in a wire used for strands of a specified structure significantly influence performance properties of strands. The use of MTT makes it possible to control in a wide range a redistribution of residual stresses in steel resulting from drawing and strand laying processes. It was established that during drawing of up to 80% degree, compressive stresses of 1100-1200 MPa degree are generated in the central layers of wire. The residual stresses on the wire surface accounted for 450-500 MPa and were tension in nature. The tension within a range of 70 kN to 82 kN combined with a temperature range of 360-380°С contributes to a two-fold decrease in residual stresses both in the central and surface layers of wire. When increasing temperature up to 400°С and maintaining the tension, it is possible to achieve maximum balance of residual stresses. Stranding stresses, whose high values entail failure of lay length and geometry of the studied strand may be fully eliminated only at tension of 82 kN and temperature of 400°С. Otherwise, stranding stresses result in opening of strands.

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