منابع مشابه
Weld defect formation in rail thermite welds
A previously developed heat transfer model is used to study the influence of welding parameters on weld defect development in thermite welds. Weld defect formation maps are constructed from a series of heat transfer simulations. For the current normal rail thermite welding conditions, it is found that shrinkage cavity formation can be avoided but cold-lap and centre-line defects are likely to o...
متن کاملReparation of the Damaged Forging Hammer Mallet by Hard Facing and Weld Cladding
During the long-term operation, mallets of the forging hammers are exposed to thermal fatigue due to the cyclic temperature changes and impact loads. Taking into account very high price, and a risk of buying frequently the new parts, the necessity of their reparation becomes obvious. The forging hammer mallet (Figure 1), is primarily exposed to the impact compressive loads, and partially also t...
متن کاملAnalytical Approach to Vibration Analysis Of the Wheel-rail contact
Wheel/rail contact simulation is one of the most complicated problems in the modeling of railway vehicles. The wheel/rail interaction plays a unique role in rail vehicle dynamics. In this paper, the dynamic response of the wheel on irregular rail track is analyzed with analytical approach using the method of Multiple Scales (MMS). The Hertzian contact theory is used to obtain the relationshi...
متن کاملLimits of Acceptable Rail-and-Post Deflection in Crash-Damaged Strong-Post W-Beam Guardrail
the supporting posts and soil. Impacts with a higher speed but shallower angle can also cause more distributed rail-and-post deflection. The amount of deflection that can be sustained by guardrail before its safety is compromised is a major concern. Maintenance crews and highway agencies are often forced to balance the expense of continual repairs against the potential liability if the damaged ...
متن کاملSpot Weld Analysis With 2D Ultrasonic Arrays
This paper describes a threefold method of testing the performance of an array-based ultrasonic tool for nondestructive testing of spot welds. The tool is described in its capabilities, use, and advantages over existing counterparts. Performance testing for and the results from carrying out the testing are described. The three performance testing methods include 1) the use of calibrated samples...
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ژورنال
عنوان ژورنال: Quarterly Report of RTRI
سال: 2003
ISSN: 0033-9008,1880-1765
DOI: 10.2219/rtriqr.44.59