Improving the Method of Calculating the Critical Stresses and Strains in Strips Rolled in the Edging Rolls of a Universal Mill

Using the finite element software ANSYS/LS-DYNA for the universal rolling machine to simulate,research unit of the universal rolling deformation etc, and the use of universal mill for heavy rail rolling to simulate of lead samples, study of both. By comparing experimental results, the results show rolling simulation of laboratory lead samples and finite element simulations of computer are basically the same, use the universal pass, the difference of pressure coefficient for the rail head and rail base and rail back that work on the workpiece at the universal pass is small, deformation of workpiece is uniformity, it ensure the dimensional accuracy of the finished rail on the rail section.

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Efficient identification of critical stresses in structures subject to dynamic loads

Computers & Structures ◽

10.1016/0045-7949(86)90041-6 ◽

1986 ◽

Vol 22 (3) ◽

pp. 373-386 ◽

Cited By ~ 14

Author(s):

Ramana V Grandhi ◽

Raphael T Haftka ◽

Layne T Watson

Keyword(s):

Dynamic Loads ◽

Critical Stresses

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Critical stresses in rolling contact fatigue

Wear ◽

10.1016/0043-1648(81)90225-8 ◽

1981 ◽

Vol 71 (3) ◽

pp. 265-282 ◽

Cited By ~ 29

Author(s):

N.G. Popinceanu ◽

E. Diaconescu ◽

S. Cretu

Keyword(s):

Rolling Contact Fatigue ◽

Contact Fatigue ◽

Rolling Contact ◽

Critical Stresses

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Анализ скоростных зависимостей критических напряжений в алюминиевых сплавах системы Al-Mg при ударных нагрузках

Физика твердого тела ◽

10.21883/ftt.2020.11.50048.077 ◽

2020 ◽

Vol 62 (11) ◽

pp. 1749

Author(s):

А.Д. Евстифеев ◽

И.В. Смирнов ◽

Ю.В. Петров

Keyword(s):

Corrosion Resistance ◽

Aluminum Alloys ◽

Strain Rate ◽

Slight Reduction ◽

Dynamic Stresses ◽

Good Ductility ◽

Critical Stresses ◽

Critical Dynamic ◽

Strain Rate Loading ◽

Alloys Of The Al

Aluminum alloys of the Al-Mg system are widely used in automotive and aviation industries due to their combination of strength, good ductility and corrosion resistance. Increasing the percentage of magnesium leads to higher strength of the material with a slight reduction of ductility. Behavior of critical stresses in materials were studied under variable strain rate loading conditions. The possibility to predict critical dynamic stresses of materials based on a structural-time approach is discussed.

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Critical Stresses in Materials with Cracks

Revista de Chimie ◽

10.37358/rc.19.7.7358 ◽

2019 ◽

Vol 70 (7) ◽

pp. 2442-2446

Author(s):

Simona Eugenia Manea ◽

Vali Ifigenia Nicolof ◽

Teodor Sima

Keyword(s):

Fracture Mechanics ◽

Critical Stress ◽

Crack Width ◽

Crack Depth ◽

Equivalent Stress ◽

Critical Energy ◽

Material Behavior ◽

Experimental Results ◽

Critical Stresses ◽

Mechanics Concepts

The fracture mechanics concepts, as well as the concepts introduced on the basis of principle of critical energy, correlated with strength of materials with cracks is analysed. The equivalent stress method of strength was applied to cracked materials, by using the concept of local critical stress. This one depends on the material behavior and the deterioration due to crack. Experimental results have been obtained with specimens of OL304 steel with different cracks. The influence of crack depth and crack width is put into evidence.

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Research on the Approach for the Assessment of Subsurface Rolling Contact Fatigue Damage

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.395-396.845 ◽

2013 ◽

Vol 395-396 ◽

pp. 845-851

Author(s):

Xiao Feng Qin ◽

Da Le Sun ◽

Li Yang Xie

Keyword(s):

Shear Stress ◽

Friction Coefficient ◽

Fatigue Damage ◽

Stress Ratio ◽

Rolling Contact Fatigue ◽

Contact Fatigue ◽

Rolling Contact ◽

Critical Stresses ◽

Orthogonal Shear Stress

In this paper, the distribution of different critical stresses, which were used in previous correlation articles for the assessment of subsurface rolling contact fatigue damage, was analyzed. The rationality of orthogonal shear stress was selected as the key stress controlling the subsurface rolling contact fatigue damage was clarified. Base on the linear fatigue damage accumulative theory and the modification equation for the range of asymmetrical stress, the influence of friction on subsurface rolling contact fatigue damage was studied. The results show that the subsurface orthogonal shear stress is a completely symmetrical stress when the friction coefficient is zero, while it is an asymmetrical stress with considering the friction. The stress ratio of subsurface orthogonal shear stress and subsurface rolling contact fatigue damage is increased with the increasing of friction.

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