Productivity of labor in the impact machine shops

Metallurgist ◽  
1965 ◽  
Vol 9 (9) ◽  
pp. 524-525
Author(s):  
A. Genesin ◽  
V. Kirsh
Keyword(s):  
Impact Machine ◽  
Machine Shops ◽  
The Impact

Mechanization of handling nonmagnetic materials under the conditions of the impact-machine shops of the Magnitogorsk ISW JSC

Metallurgist ◽  
1995 ◽  
Vol 39 (2) ◽  
pp. 27-27
Author(s):  
V. F. Kostin ◽  
V. A. Kashlin ◽  
N. E. Budaev ◽  
L. S. Berdinskikh
Keyword(s):  
Impact Machine ◽  
Machine Shops ◽  
The Impact

scholarly journals Effect of reinforcement material on impact properties of epoxy

2017 ◽  
Vol 2 (3) ◽  
pp. 226-231
Author(s):  
Basim M. Fadhil ◽  
Payman Sahbah Ahmed ◽  
Ava Ali Kamal
Keyword(s):  
Carbon Fiber ◽  
Impact Test ◽  
Steel Fiber ◽  
Matrix Composites ◽  
Impact Machine ◽  
Impact Properties ◽  
Different Types ◽  
Experimental Works ◽  
Impact Characteristics ◽  
The Impact

Impact characteristics of Epoxy matrix composites is investigated by impact machine. Four different types of reinforcement are used in the experimental works: type one: 1.9wt% steel fiber, 1.9wt% carbon fiber,1.9 wt% carbon nanotube, 1.9 wt% woven carbon fiber.This work shows that reinforcing epoxy with (1.9 wt% of woven carbon fiber) improves the impact properties where energy, force and deformation values of impact test for this composite were 18.4J, 3580.59 N and 18 mm respectively while for epoxy were 2.927 J, 921.849 N and 18.413 mm respectively.

Development and characterization of structural adhesives for aerospace industry with alumina nanoparticles under shear and thermo-mechanical impact loads

2019 ◽  
Vol 234 (2) ◽  
pp. 490-507 ◽  
Author(s):  
UA Khashaba ◽  
Ramzi Othman ◽  
Ismael MR Najjar
Keyword(s):  
Contact Force ◽  
Bending Stiffness ◽  
Alumina Nanoparticles ◽  
Absorbed Energy ◽  
Impact Machine ◽  
Impact Properties ◽  
Weight Percentage ◽  
Mechanical Impact ◽  
Impact Bending ◽  
The Impact

The present work aims to improve the mechanical properties of Epocast 50-A1/946 epoxy via incorporation of alumina nanoparticles using an ultrasonic agitation method. The optimum weight percentage of alumina nanoparticles was determined based on the improvement in the shear and impact properties of the nanocomposites at room temperature and 50 ℃. Accordingly, neat epoxy panels and nanocomposite panels with 0.5, 1.0, 1.5, and 2.0 wt% alumina nanoparticles were fabricated. The shear and thermo-mechanical impact properties of the panels were measured using an instrumented drop-weight impact machine and an Iosipescu shear test fixture, respectively, according to ASTMs D5379 and D7136. The maximum improvement in shear strength and modulus was 10.9% and 8.1%, respectively, for the nanocomposites containing 1.0 and 1.5 wt% alumina nanoparticles. The predicted shear moduli of the nanocomposites agreed well with the measured values with a maximum error of 6.52%. The optimal performance of impact properties was achieved by incorporating 1.0 wt% of alumina nanoparticles. Namely, the maximum impact-bending stiffness, contact force, and absorbed energy were increased by 12.9%, 13.0%, and 23.4%, respectively. The test temperature of 50 ℃ was found to have a negative effect on the impact-bending stiffness and the maximum contact force. On the other hand, the absorbed energy was increased up to 12.1%.

Impact Toughness of Titanium Alloys with Different Strengthening Methods

2007 ◽  
Vol 353-358 ◽  
pp. 433-437 ◽  
Author(s):  
Qiao Yan Sun ◽  
Lin Xiao ◽  
Jun Sun
Keyword(s):  
Low Temperature ◽  
Impact Toughness ◽  
Room Temperature ◽  
Alloying Elements ◽  
Initiation Energy ◽  
Impact Machine ◽  
Impact Tests ◽  
General Yielding ◽  
The Impact ◽  
Effect Of Alloying

In present paper effect of alloying elements and strengthening particle on the impact toughness were investigated. Load and energy in the impact tests were also discussed in detail for Ti-2Al, Ti-2Sn,Ti-2Zr, Ti-1Mo and Ti/TiC. Impact tests were carried out at room temperature (293K) and low temperature (83K) using a 300J capacity impact machine. Ti-1Mo, Ti-2Zr,Ti-2Sn alloys exhibit high impact toughness even at low temperature, while Ti-2Al and Ti/TiC only have high toughness at room temperature. At room temperature, general yielding occurred in all the materials, but it occurred only in Ti-1Mo, Ti-2Zr and Ti-2Sn at low temperature. It seemed that strengthening titanium couldn’t affect the elastic energy (Ei) effectively, but bring about more changes to Ep (propagation energy of crack) than to Ei (initiation energy of crack). As for the effect of alloying elements on the impact toughness, it seems to be related to the comprehensive result of the concentration and electronegative property of alloying elements. The interface between the TiC particles and matrix resulted in low toughness, especially at cryogenic temperature.

scholarly journals The sensitiveness of explosives - The onset of detonation in the sensitiveness of explosives

1948 ◽  
Vol 241 (831) ◽  
pp. 197-203 ◽  
Keyword(s):  
Scientific Information ◽  
Practical Importance ◽  
Impact Machine ◽  
Physical Test ◽  
Experimental Knowledge ◽  
Future Developments ◽  
Physical Tests ◽  
The Subject ◽  
Service Conditions ◽  
The Impact

The ease with which explosives detonate on receiving a sharp blow or shock is of practical importance in determining manufacturing precautions and safety in handling, and also in deciding what initiators can be used. Physical tests on sensitiveness have hitherto imitated either manufacturing or service conditions as closely as possible. With any one physical test, such as that of the impact machine (cf. part III (1)), it is possible to arrange explosives in a scale of sensitiveness. The order of sensitiveness in a scale determined in any one way may be quite different from the order determined in other ways, but owing to the empirical nature of the tests it is often difficult to explain why anomalies occur. Results in accordance with each other are, however, obtained in many cases. Progress in synthetic organic chemistry has increased the range of possible explosives to such an extent that some more scientific information on sensitiveness would be most useful in orienting future developments. Various developments in the experimental knowledge on the subject are discussed in the following sections.

Experimental Analysis of an Instrumented Charpy Impact Using Signal Processing Approach

2011 ◽  
Vol 197-198 ◽  
pp. 1621-1625
Author(s):  
Mohd Basri Ali ◽  
Shahrum Abdullah ◽  
M.Zaki Nuawi ◽  
M.M. Padzi ◽  
K.A. Zakaria
Keyword(s):  
Signal Processing ◽  
Data Acquisition ◽  
Method Comparison ◽  
Low Carbon Steel ◽  
Charpy Impact ◽  
Dynamic Responses ◽  
Low Carbon ◽  
Impact Machine ◽  
Processing Approach ◽  
The Impact

The dynamic responses of the standard charpy impact machine are experimentally studied using the relevant data acquisition system in order to obtain the impact response. For this reason, strain gauges were connected to the data acquisition set and it was then attached to the charpy striker for the signal collection. Aluminium 6061 and low carbon steel 1050 were used for extracting strain responses on the striker during the testing. In this work, the power spectrum density (PSD) approach was then used for the energy based observation and a signal was converted from the time domain to the frequency domain using the fast Fourier transform (FFT) method. Comparison between experimental findings with related parameters such as of different materials, strain signals pattern, I-kaz, were finally correlated and discussed. It was found that the modulus of elasticity were proportional to the energy absorbed, strain signals amplitude and PSD. Finally, it is suggested that the properties of materials and the impact signals pattern is suitable to be analysed using the signal processing approach.

Research about the Effect of Ultrasonic Impact on the Fatigue Life of Butt Weld Joint of 16MnR Steel

2011 ◽  
Vol 189-193 ◽  
pp. 3296-3299
Author(s):  
Ying Xia Yu ◽  
Bo Lin He ◽  
Huang Huang Yu ◽  
Jian Ping Shi
Keyword(s):  
Fatigue Life ◽  
Welded Joint ◽  
Butt Joint ◽  
Impact Machine ◽  
Ultrasonic Impact Treatment ◽  
Butt Weld ◽  
Impact Time ◽  
Weld Toe ◽  
The Impact ◽  
Fatigue Experiment

Surface treatment was carried out on the butt joint weldment of 16MnR steel by using the HJ-II-type ultrasonic impact machine. The ultrasonic impact current is 1.2A, the impact amplitude is 30 microns and ultrasonic impacting time is 30min and 60 min,respectively. Fatigue experiment was carried out for both treated specimen and un-treated specimen. The fatigue fracture observed with the scanning electron microscope of 6360LA type. The experimental results show that the fatigue life of the butt joint weldment of 16MnR steel can be significantly improved through the ultrasonic impact treatment. The main reason is that the ultrasonic impact can reduces the stress concentration in the weld toe, decrease the tensile stress, and even change to compressive stress in the weldment, the grain size in the welded joint can be refined. The longer the impact time, the greater increasing range of fatigue life will be. Compared to the sample without treatment, its fatigue life was increased 375.22%, 521.24%, respectively, when the impact time was 30, 60min, respectively.

Research about the Effect of Ultrasonic Impact on the Mechanical Property of Welded Cruciform Joint of P355NL1 Steel

2014 ◽  
Vol 644-650 ◽  
pp. 4748-4751
Author(s):  
Bo Lin He ◽  
Ying Xia Yu ◽  
Si Yong Lei ◽  
Jian Ping Shi
Keyword(s):  
Mechanical Property ◽  
Residual Stress ◽  
Grain Size ◽  
Compressive Residual Stress ◽  
Impact Machine ◽  
Ultrasonic Impact Treatment ◽  
Weld Toe ◽  
The Impact ◽  
Cruciform Joint ◽  
Scanning Electron

Surface treatment was carried out on the welded cruciform joint of P355NL1 steel by using the HJ-II-type ultrasonic impact machine. The ultrasonic impact current is 1.5A, the impact amplitude is 20 microns and ultrasonic impacting time is 5min. Tensile test was carried out for both treated specimen and un-treated specimen. The fracture observed with the scanning electron microscope of 6360LA type. The experimental results show that although the compressive residual stress can be obtained in the surface of weld toe area, and the grain size in the surface of welded cruciform joint can be refined, but the mechanical property of the welded cruciform joint of P355NL1 steel can not be improved through the ultrasonic impact treatment. The main reason is that the ultrasonic impact layer is only 70um, it is to thin to compared to the thickness of the specimen.

Effect of Different Energy Frames on the Impact Velocity of Strain Energy Frame Impact Machine

2015 ◽  
Vol 27 (4) ◽  
pp. 363-375
Author(s):  
Seung Hun PARK ◽  
Jun Ki PARK ◽  
Tuan Kiet TRAN ◽  
Dong Joo KIM
Keyword(s):  
Impact Velocity ◽  
Strain Energy ◽  
Impact Machine ◽  
The Impact

Evaluating Charpy Impact Signals with Different Frequencies Using Power Spectrum Densities

2010 ◽  
Vol 156-157 ◽  
pp. 1518-1521
Author(s):  
Shahrum Abdullah ◽  
Mohd Basri Ali ◽  
Mohd Zaki Nuawi ◽  
Zulkifli Mohd Nopiah ◽  
Kamal A. Ariffin
Keyword(s):  
Power Spectrum ◽  
Low Carbon Steel ◽  
Charpy Impact ◽  
Power Spectrum Density ◽  
Dynamic Responses ◽  
Low Carbon ◽  
Impact Machine ◽  
Impact Simulation ◽  
Spectrum Density ◽  
The Impact

The dynamic responses of the standard charpy impact machine are experimentally studied using the relevant data acquisition system in order to obtain the impact response. The numerical analysis by means of the finite element method has been used to obtain the findings. The standard charpy modelling using the aluminium 6061 material and low carbon steel 1050 were used for extracting strain responses on the striker during the impact simulation. A power spectrum density (PSD) approach is then applied to convert a signal from the time domain to the frequency domain using the fast Fourier transform (FFT) method. Related parameters of different frequencies, different material, strain signals, power spectrum density (PSD) and the relationship between them were finally correlated and discussed. It was found that the modulus elasticity of materials and frequencies (sample rates) were proportional to the strain signals and PSD during impact simulation.

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