scholarly journals Residual stress in explosion hardened high manganese austenitic cast steel subjected to repeated impact loads.

1987 ◽  
Vol 36 (401) ◽  
pp. 105-109
Author(s):  
Akira ODA ◽  
Hideaki MIYAGAWA
Keyword(s):  
Residual Stress ◽  
Cast Steel ◽  
Impact Loads ◽  
High Manganese ◽  
Repeated Impact

Behaviour of new LCR and ordinary prestressed concrete railway sleepers under repeated impact loads

2022 ◽  
Vol 319 ◽  
pp. 126151
Author(s):  
Ferhat Çeçen ◽  
Bekir Aktaş ◽  
Hakan Öztürk ◽  
M. Burhan Navdar ◽  
İrfan Ş. Öztürk
Keyword(s):  
Prestressed Concrete ◽  
Impact Loads ◽  
Repeated Impact

Effect of Microshot Peening on Surface Characteristics of Spring Steel

2010 ◽  
Vol 654-656 ◽  
pp. 374-377
Author(s):  
Yasunori Harada ◽  
Koji Yoshida
Keyword(s):  
Residual Stress ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Cast Steel ◽  
High Hardness ◽  
Surface Characteristics ◽  
Spring Steel ◽  
Cemented Carbide ◽  
High Carbon ◽  
New Type

Shot peening is a surface treatment that improves the performance of engineering components. In conventional shot peening, the medium consists of small spheres, which are usually made of high-carbon cast steel; the diameter of the spheres is in the range from 0.3 to 1.2mm. More recently, however, a new type of microshot has been developed to enhance the peening effect. The diameter of the spheres in the new medium is in the range from 0.02 to 0.15mm. In the present study, the effect of microshot peening on the surface characteristics of spring steel was investigated. The injection method of the microshot was of the compressed air type. The microshots of 0.1mm diameter were high-carbon cast steel and cemented carbide, and the workpiece used was the commercially spring steel JIS-SUP10. The surface roughness, hardness and compressive residual stress of the peened workpieces were measured. The surface layer of the workpieces was sufficiently deformed by microshot peening. A high hardness or residual stress was observed near the surface. The use of hard microshots such as cemented carbide was found to cause a significantly enhanced peening effect for spring steel.

Mechanics Behavior Analysis on Laser Cladding under Repeated Impacting Load

2010 ◽  
Vol 154-155 ◽  
pp. 1100-1103
Author(s):  
Ru Shu Peng ◽  
De Wen Tang ◽  
Qiong Liu
Keyword(s):  
Behavior Analysis ◽  
Stress Wave ◽  
Laser Cladding ◽  
Impact Load ◽  
Joint Surface ◽  
Impact Loads ◽  
Repeated Impact ◽  
Hardness Change

On the property of repeated impact load, the attrition, hardening and plasticity warp of the laser cladding sampling were researched by using stress wave spread theory. Results show that under repeated impact loads, stress wave occurs on the metallurgical joint surface of the coat and the basis, forming stretch wave that causes coat slitting and angle splitting. The micro-pits failure and deep exfoliation occur on the coat surface because of the stress centralization. The accumulation of impact load energy cause hardness change and plasticity warp.

Experimental and Numerical Investigation of Aluminum Alloy Plates With Initial Crack Under Repeated Dynamic Impact Loads

2018 ◽  
Author(s):  
Fangjuan Duan ◽  
Weiguang Liu ◽  
De Xie ◽  
Jingxi Liu ◽  
Zhiqiang Hu
Keyword(s):  
Aluminum Alloy ◽  
Numerical Simulations ◽  
Carrying Capacity ◽  
Initial Crack ◽  
Impact Loads ◽  
Load Carrying Capacity ◽  
Repeated Impact ◽  
Alloy Plate ◽  
Numerical Predictions ◽  
Load Carrying

Ships and offshore structures are often exposed to various types of repeated impact loads, such as wave slamming, floating ice impacts and ship collisions which will cause large deformation or even fracture. With imperfections due to the process of construction or damage caused by accidents, the load carrying capacity of structures will decrease. This paper investigates the load carrying capacity of aluminum alloy plate with an initial crack under repeated impact loads by means of experiments and numerical simulations. In the experiments, the prepared specimens with crack and without crack are impacted repeatedly up to plate perforation by releasing a hemispherical-headed cylindrical hammer. Numerical simulations are carried out with ABAQUS/Explicit software. The numerical models are built according to the actual experimental conditions. Comparison of the numerical predictions with the experimental results shows reasonable agreement. It is found that aluminum alloy plates under repeated impacts are sensitive to initial cracks. The fracture mode and plastic deformation of aluminum alloy plates can also be affected.

A Rudimentary Analysis of Improving Fatigue Life of Metals by Shot-Peening

1990 ◽  
Vol 57 (2) ◽  
pp. 307-312 ◽  
Author(s):  
Y. F. Al-Obaid
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Theoretical Analysis ◽  
Shot Peening ◽  
Reasonable Agreement ◽  
Experimental Results ◽  
Single Shot ◽  
Repeated Impact ◽  
Entire Surface ◽  
Complicated Process

In this paper, a rudimentary analysis of improving fatigue life of metals is presented. The process is viewed as one of repeated impact of a stream of hard shots on to a target. The model considers first a single shot impinging upon a target and, on bouncing, it leaves a residual stress below the surface of the target. The problem is then generalized to consider the effect of a stream of shots by assuming their effect to be uniformly distributed over the entire surface. The analysis is highly simplified and it mainly aims at understanding the mechanics of this complicated process. Although rudimentary, the theoretical analysis is seen to be in reasonable agreement with experimental results performed with shots on targets of various materials.

AN ANALYSYS OF WEAR AND MECHANICAL AND TRIBOLOGICAL PROPERTIES OF HIGH-MANGANESE CAST STEEL HARDENED BY DIFFERENT METHODS

Tribologia ◽  
2018 ◽  
Vol 280 (4) ◽  
pp. 137-142
Author(s):  
Dagmara TRYBA ◽  
Marcin KOT ◽  
Anna ANTOSZ
Keyword(s):  
Wear Resistance ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Cast Steel ◽  
Base Material ◽  
High Manganese ◽  
Dynamic Impact ◽  
Mechanical And Tribological Properties ◽  
Alternative Method

Properties of high manganese austenitic cast steel are not satisfactory; therefore, this material should be hardened. Currently, the commonly used method of hardening does not allow eliminating problems related to premature wear of railway frogs. Therefore, many studies have been carried out to find an alternative method to obtain improved wear resistance of such elements. The article presents an analysis of the mechanical and tribological properties of base and hardened, by different methods, high-manganese cast steel applied for turnouts. Tests were performed for three hardening methods: explosive, pressure-rolling, and dynamic impact. The results were compared with the properties of base material after saturation treatment. The conducted tests allowed the determination of hardness profiles of hardened surfaces, as well as the wear resistance and coefficient of friction, and the obtained results are very promising. Hardening by dynamic impact provided much better results in relation to presently used explosive hardening technology.

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