Approaches to automation of strength and durability analysis of crane metal structures

2021 ◽  
pp. 303-315
Author(s):  
S. Gubskyi ◽  
V. Chukhlib ◽  
A. Okun ◽  
Y. Basova ◽  
S. Pavlov ◽  
...  
Author(s):  
S.V. Grubyi ◽  
P.A. Chaevskiy

Machine-building parts can have cylindrical and end grooves, for the machining of which compound and assembled cutters with different geometrical parameters and design features are used. These parts are made of structural steels, including hardened steels, corrosion-resistant steels and alloys, and other tough materials. Improving the efficiency of hard-alloy grooving cutters is an important research and technological challenge. This article presents the results of research concerning the development of methods for calculating forces and temperatures in the cutting area, wear rates and tool life for turning grooves in workpieces of various structural steels, including steels with increased hardness. A test strength calculation of the cutting wedge is conducted and an analysis of the influence of the operating and geometric parameters of the tool on the safety factors on the front and rear surfaces of the tool is performed. Based on the results of the strength and durability analysis, the choice of the hard alloy grade and the limiting values of the cutting speed and the cut layer thickness are validated. The developed recommendations concerning geometrical parameters of the cutting wedge and strength characteristics of the tool material can serve as the basis for designing assembled groove cutters equipped with interchangeable multi-faceted plates.


Transport ◽  
2009 ◽  
Vol 24 (2) ◽  
pp. 83-92 ◽  
Author(s):  
Mykolas Daunys ◽  
Donata Putnaitė ◽  
Žilvinas Bazaras

The paper presents the durability analysis of the automatic coupler in railway carriages. The loading of the automatic coupler predetermined by the weight of a train, train speed and railway relief is a time‐dependent variable. The finite element method was used for stress‐strain state calculation taking into account acting forces. In order to reduce stress concentration, the geometry of the automatic coupler's body was modified. Modelling results for different rounded radii demonstrated it was possible to reduce stress concentration up to 34%. Under maximum forces, plastic strain occurs in the automatic coupler's body. The calculation of strain and stress state in the body of the automatic coupler shows it is under a static, low and high cycle loading. Therefore, to calculate the durability of the automatic coupler, the dependencies for low cycle nonstationary stress limited loading has been proposed evaluating low cycle quasistatic and fatigue damages. In order to evaluate high cycle fatigue damage, a linear law for the summation of loading cycles has been suggested. For low cycle damage evaluation, the calculation method for the summation of fatigue and quasi‐static damages created at one loading cycle taking into account loading level and neglecting the sequence of cycles has been put forward. Thus, to calculate the automatic coupler for each specific case, it is necessary to determine the number of loading cycles at each loading level and to evaluate durability considering dependencies presented in this paper.


Author(s):  
Liping Huang ◽  
Hari Agrawal

Abstract Since the environment of vehicle operation is dynamic in nature, dynamic method should be used in vehicle durability analysis. Due to the constraints in current computer resources, simulation of vehicle durability test and vehicle structural Me analysis need special approaches and efficient CAE tools. A methodology and an integrated analysis process is presented in this paper. Three examples of structural life analysis using transient dynamics are given. The examples show that dynamics analysis for vehicle life prediction is feasible by employing efficient methods and proper process. Results from the analysis demonstrate that dynamic stress levels are much higher than static stress at some locations and that dynamic methods give a significantly different structural life compared with static analysis.


Author(s):  
Sung Gil Han ◽  
Yoo-In Shin ◽  
Chan Heon Yoon ◽  
Chul Ki Song

2007 ◽  
Vol 39 (2) ◽  
pp. 116-127
Author(s):  
N. V. Novikov ◽  
V. I. Kushch ◽  
S. I. Shestakov

2021 ◽  
Vol 14 (1) ◽  
pp. 30-34
Author(s):  
Д.К. Магомедова ◽  
А.А. Чуракова

Проблема расчета прочности и долговечности различных конструкций из металлов является одной из важнейших в современном мире. Для ее решения необходимо понимание определенных механических критериев материала, таких как прочность, пластичность и др. [1, 2]. В данной работе приводятся данные расчета и указан характер распределения критических напряжений, которые определяют зарождение пор внутри материала, в данном случае в Al-6101, при статическом нагружении. Зарождение и слияние пор представляют собой первую стадию разрушения материала. При наличии данных о критических напряжениях материала можно спрогнозировать его дальнейшее разрушение [3, 4]. Calculation of strength and durability of various metal structures presents one of the most significant tasks in the contemporary world. To achieve it, the different mechanical criteria of the material, such as strength, ductility, etc. [1, 2] should be known. The calculation data and t distribution pattern of critical stresses that define formation of pores in the material (in our case, Al-6101) under static loading are presented in this article. The first phase of material fracture is the pore formation and merging. Therefore, its subsequent fracture can be estimated using the data on the critical stresses of the material [3, 4].


Author(s):  
W. T. Donlon ◽  
J. E. Allison ◽  
S. Shinozaki

Light weight materials which possess high strength and durability are being utilized by the automotive industry to increase fuel economy. Rapidly solidified (RS) Al alloys are currently being extensively studied for this purpose. In this investigation the microstructure of an extruded Al-8Fe-2Mo alloy, produced by Pratt & Whitney Aircraft, Goverment Products Div. was examined in a JE0L 2000FX AEM. Both electropolished thin sections, and extraction replicas were examined to characterize this material. The consolidation procedure for producing this material included a 9:1 extrusion at 340°C followed by a 16:1 extrusion at 400°C, utilizing RS powders which have also been characterized utilizing electron microscopy.


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