Development of Ultrasonic Surface Treatment Device

2016 ◽  
Vol 835 ◽  
pp. 620-625 ◽  
Author(s):  
Yan Jun Qian ◽  
Sang Wook Han ◽  
Hyock Ju Kwon
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Fatigue Life ◽  
Surface Treatment ◽  
Tribological Properties ◽  
Treatment Effect ◽  
Vibration Mode ◽  
Plastic Deformations ◽  
Ultrasonic Surface Treatment

Research based on ultrasonic surface treatment (UST) shows that the operation is beneficial to tribological properties and fatigue life of mechanical structures by enhancing the surface mechanical properties, such as roughness and residual stress, through changing nanostructure induced by severe plastic deformations on the surface. The amplitude of the vibration at the processing end is essential for the treatment effect. This paper presents a way to design an UST device that can control the amplitude and vibration mode.

The Tribological Properties of Mg Alloy Produced by ECAE and Laser Melting

2013 ◽  
Vol 773 ◽  
pp. 397-401
Author(s):  
Lei Lei Gao ◽  
Jin Zhong Zhang
Keyword(s):  
Mechanical Properties ◽  
Surface Treatment ◽  
Tribological Properties ◽  
Equal Channel Angular Extrusion ◽  
Mg Alloy ◽  
Laser Melting ◽  
Processing Procedure ◽  
Angular Extrusion ◽  
Melting Surface ◽  
New Processing

A new processing procedure was applied to an Mg alloy. This procedure involves the equal channel angular extrusion (ECAE) process and laser melting surface treatment. A commercial Mg alloy was first produced by equal channel angular extrusion (ECAE) process. Then the laser melting surfave treatment was carried out after ECAE. The effects of ECAE and laser melting on tribological properties of the alloy were investigated. Experimental results showed that the mechanical properties and tribological properties of the alloy were improved after ECAE. The laser melting surface treatment can further improve the tribological properties of Mg alloy.

scholarly journals Analysis of Mechanical and Tribological properties of Silicon incorporated Diamond Like Carbon Nanocomposite

2021 ◽  
Author(s):  
V. Sakthi Murugan ◽  
S. Madhu
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Tribological Properties ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Diamond Like Carbon ◽  
Mechanical And Tribological Properties ◽  
Atomic Force ◽  
Carbon Nanocomposite ◽  
Scanning Electron

Abstract The Silicon (Si) contained diamond like carbon (DLC) nanocomposite were prepared by using thermal chemical vapour deposition (CVD) technique by varying the acetylene (C2H2) flowrates. The scanning electron microscope (SEM) results showed a smoother surface of nanocomposite at low C2H2 flowrates. The atomic force microscope (AFM) reveals the increase of particle size and surface roughness of the composite with respect to the C2H2 flowrates. The mechanical properties were evaluated using the nanoindentation and it is observed that the hardness (H) and young’s modulus (E) of the nanocomposite increases with increase of the C2H2 flow rate. The internal stress (𝝈) was computed by using Stoney’s equation and it is noticed that due to the incorporation of Si the residual stress significantly decreased. The tribological properties of the nanocomposite were analysed by computing the H/E, H3/E2, plasticity index (PI) and elasticity index (EI). The results showed that the Si incorporated nanocomposite (Si-DLC) has an excellent tribological properties.

scholarly journals Improvement of mechanical properties and fatigue life by shot peening process on ASTM A516 Grade 70 steel

2018 ◽  
Vol 14 (4) ◽  
pp. 440-442
Author(s):  
Mohd Rashdan Isa ◽  
Omar Suliman Zaroog ◽  
Kalaikathir Murugan ◽  
Sharif Osman Kabashi Guma ◽  
Fareg Saeid Ali
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Tensile Strength ◽  
Fatigue Life ◽  
Fatigue Test ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Industrial Sector ◽  
Low Intensity ◽  
Before And After

ASTM A516 Grade 70 is widely used in the industrial sector as it provides very good mechanical properties in tough conditions. The main usage of this material is in moderate and low operating services. This paper focuses on the effect of shot peening process on ASTM A516 Grade 70 on improving the mechanical properties and fatigue life of the material. Samples have been shot peened with steel shot to induce compressive residual stress. Hardness, tensile and fatigue test as well as microstructure were done on the samples before and after shot peening process to study the effects on mechanical properties. The result shows that there is an increment in every test after shot peening process. There is a slight increment of 0.47% in hardness value, 0.39% increment in tensile strength and 6.78% increment in fatigue life of the material after shot peening process applied. The slight increment in every result was due to the low intensity of the shot peening process. Result also shows that the shot peening process compressed the molecules closer to each other as can be seen under SEM. Therefore it was proven that in this study, there is a very significant improvement in mechanical properties and fatigue life by shot peening process on ASTM A516 Grade 70 Steel.

3D Computational Simulation of Multi-Impact Shot Peening

2012 ◽  
Vol 1485 ◽  
pp. 35-40
Author(s):  
Juan Solórzano-López ◽  
Francisco Alfredo García-Pastor
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Stress Field ◽  
Surface Treatment ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Fatigue Testing ◽  
Computational Simulation ◽  
Target Material ◽  
Residual Stress Field

ABSTRACTShot peening is a widely applied surface treatment in a number of manufacturing processes in several industries including automotive, mechanical and aeronautical. This surface treatment is used with the aim of increasing surface toughness and extending fatigue life. The increased performance during fatigue testing of the peened components is mainly the result of the sub-surface compressive residual stress field resulting from the plastic deformation of the surface layers of the target material, caused by the high-velocity impact of the shot. This compressive residual stress field hinders the propagation and coalescence of cracks during the second stage of fatigue testing, effectively increasing the fatigue life well beyond the expected life of a non-peened component.This paper describes a 3D computational model of spherical projectiles impacting simultaneously upon a flat surface. The multi-impact model was developed in ABAQUS/Explicit using finite element method (FEM) and taking into account controlling parameters such as the velocity of the projectiles, their incidence angle and different impact locations in the target surface. Additionally, a parametric study of the physical properties of the target material was carried out in order to assess the effect of temperature on the residual stress field.The simulation has been able to successfully represent a multi-impact processing scenario, showing the indentation caused by each individual shot, as well as the residual stress field for each impact and the interaction between each one of them. It has been found that there is a beneficial effect on the residual stress field magnitude when shot peening is carried out at a relatively high temperature. The results are discussed in terms of the current shot-peening practice in the local industry and the leading edge developments of new peening technologies. Finally, an improved and affordable processing route to increase the fatigue life of automotive components is suggested.

Experimental and Simulation Method of Introducing Compressive Residual Stress in ASTM A516 Grade 70 Steel

2019 ◽  
Vol 803 ◽  
pp. 27-31
Author(s):  
Mohd Rashdan Isa ◽  
Saiful Naim Sulaiman ◽  
Omar Suliman Zaroog
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Surface Treatment ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Tensile Loading ◽  
Simulation Method ◽  
Single Shot ◽  
Equivalent Amount ◽  
Simulation Procedure

Compressive residual stress below the surface of material could increase fatigue life as it encounters the tensile loading applied on the material during operation. Shot peening process is a common surface treatment to introduce this stress. This study will investigate on how to introduce the same amount of residual stress by simulation using FEM as introduced in experimental shot peening process. Actual shot peening process was done using a particular sets of parameters and FEM with single shot is used to simplify the simulation procedure. Result shows that using a single shot simulation could also introduce the equivalent amount of residual stress as in the experimental multi-shots shot peening process. This value could be used in further study to study the relaxation of the stress after load is being applied.

scholarly journals Influence of Epoxy Resin Treatment on the Mechanical and Tribological Properties of Hemp-Fiber-Reinforced Plant-Derived Polyamide 1010 Biomass Composites

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1228
Author(s):  
Maiko Morino ◽  
Tetsuto Kajiyama ◽  
Yosuke Nishitani
Keyword(s):  
Mechanical Properties ◽  
Wear Rate ◽  
Surface Treatment ◽  
Epoxy Resin ◽  
Tribological Properties ◽  
Alkaline Treatment ◽  
Hemp Fiber ◽  
Mechanical And Tribological Properties ◽  
Polyamide 1010 ◽  
Resin Treatment

In this study, we investigated the influence of epoxy resin treatment on the mechanical and tribological properties of hemp fiber (HF)-reinforced plant-derived polyamide 1010 (PA1010) biomass composites. HFs were surface-treated using four types of surface treatment methods: (a) alkaline treatment using sodium chlorite (NaClO2) solution, (b) surface treatment using epoxy resin (EP) solution after NaClO2 alkaline treatment, (c) surface treatment using an ureidosilane coupling agent after NaClO2 alkaline treatment (NaClO2 + A-1160), and (d) surface treatment using epoxy resin solution after the (c) surface treatment (NaClO2 + A-1160 + EP). The HF/PA1010 biomass composites were extruded using a twin-screw extruder and injection-molded. Their mechanical properties, such as tensile, bending, and dynamic mechanical properties, and tribological properties were evaluated by the ring-on-plate-type sliding wear test. The strength, modulus, specific wear rate, and limiting pv value of HF/PA1010 biomass composites improved with surface treatment using epoxy resin (NaClO2 + A-1160 + EP). In particular, the bending modulus of NaClO2 + A-1160 + EP improved by 48% more than that of NaClO2, and the specific wear rate of NaClO2 + A-1160 + EP was one-third that of NaClO2. This may be attributed to the change in the internal microstructure of the composites, such as the interfacial interaction between HF and PA1010 and fiber dispersion. As a result, the mode of friction and wear mechanism of these biomass composites also changed.

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