Design and Durability Analysis of Ladder Chassis Frame

2019 ◽  
Author(s):  
M. Gurjar ◽  
Shubham Deshmukh ◽  
S. Goswami ◽  
V. Mathankar ◽  
S. Shrivastava
Keyword(s):  
Durability Analysis

Durability Analysis of the Reduction Gear for High Speed Train Considering Driving Histories

2012 ◽  
Vol 586 ◽  
pp. 269-273
Author(s):  
Chul Su Kim ◽  
Gil Hyun Kang
Keyword(s):  
Fatigue Life ◽  
High Speed ◽  
Element Model ◽  
Rolling Stock ◽  
Reduction Gear ◽  
High Speed Train ◽  
Analysis Software ◽  
Tractive Effort ◽  
Durability Analysis ◽  
The Finite Element Model

To assure the safety of the power bogies for train, it is important to perform the durability analysis of reduction gear considering a variation of velocity and traction motor capability. In this study, two types of applied load histories were constructed from driving histories considering the tractive effort and the train running curves by using dynamic analysis software (MSC.ADAMS). Moreover, this study was performed by evaluating fatigue damage of the reduction gears for rolling stock using durability analysis software (MSC.FATIGUE). The finite element model for evaluating the carburizing effect on the gear surface was used for predicting the fatigue life of the gears. The results showed that the fatigue life of the reduction gear would decrease with an increasing numbers of stops at station.

scholarly journals Mechanical and durability assessment of cement-based and alkali-activated coating mortars in an aggressive marine environment

2021 ◽  
Vol 3 (6) ◽  
Author(s):  
Salar Lashkari ◽  
Farzad Yazdipanah ◽  
Mahyar Shahri ◽  
Prabir Sarker
Keyword(s):  
Silica Fume ◽  
Marine Environment ◽  
Strength Test ◽  
High Rate ◽  
Chloride Diffusion ◽  
Strength Development ◽  
Diffusion Resistance ◽  
Capillary Absorption ◽  
Durability Analysis ◽  
Alkali Activated

AbstractCoatings are used as practical solutions against the intrusion of corrosive ions into concrete structures, particularly, in the harsh marine environment. In the present study, the effectiveness of using cement-based and geopolymer-based coatings produced using by-product materials has been evaluated. Silica fume and GGBFS at their optimum dosages were incorporated into mortar mixtures as a cement replacement, and mixtures of NaOH or KOH and sodium silicate solutions were used in the alkali-activated mortars. Shrinkage test, RCMT, and capillary absorption test as common experiments for durability analysis, as well as tests related to the mechanical and bonding properties including compressive strength test, pull-off test, and shear bonding strength test were carried out on the specimens. According to the results, both geopolymer and cement-based mortars improved the compressive and bonding strengths, and chloride diffusion resistance of coatings compared to the OPC mortar. Silica fume was found to be more effective in the strength development of mortars at young ages, while GGBFS was more responsible for acting as a filler and producing further gel in the older ages. The major drawback with geopolymer mortars is the high rate of water absorption and shrinkage coefficient in the early hours, which shows the importance of curing of these mortars at young ages. Overall, the mix design produced with 30% GGBFS and 7.5% silica fume showed the highest durability and mechanical properties and proved to be more compatible with the harsh environment of the Persian Gulf.

Comparative durability analysis of CFRP-strengthened RC highway bridges

2012 ◽  
Vol 30 ◽  
pp. 629-642 ◽  
Author(s):  
Osama Ali ◽  
David Bigaud ◽  
Emmanuel Ferrier
Keyword(s):  
Highway Bridges ◽  
Durability Analysis

Research on Combined Processing Technology of Superficial Layers Hardened Steel

2016 ◽  
Vol 841 ◽  
pp. 21-28
Author(s):  
Petrică Corabieru ◽  
Stefan Velicu ◽  
Anişoara Corabieru ◽  
Dan Dragos Vasilescu ◽  
Ionel Păunescu
Keyword(s):  
Solid State ◽  
Liquid Phase ◽  
Cooling Rate ◽  
Hold Time ◽  
Hardened Steel ◽  
Operating Conditions ◽  
Technological Parameters ◽  
Surface Layers ◽  
Durability Analysis ◽  
Machined Parts

The novelty technology lies in the fact that the hardening of the surface layers is carried out both in liquid phase and in the solid state. Technology comprises three main stages with 12 technological phases.Experimentation highlights the viability of the technological procedure. The results of tests and verifications are the basis of the analysis of combined machined parts behavior in conditions similar to the operating conditions and of the analysis of the dependence between operation behavior and durability. Analysis of the results revealed the fact that failure to technological parameters: casting temperature; hold time at high temperatures; cooling rate after microalloying in liquid phase, gives rise to possible faults of the combined treated parts.

scholarly journals Durability analysis of underground structures based on various creep models of the enclosing salt rock massif

2020 ◽  
Vol 201 ◽  
pp. 01007
Author(s):  
Mikhail Zhuravkov ◽  
Sergey Hvesenya ◽  
Siarhei Lapatsin
Keyword(s):  
Underground Structure ◽  
Primary Creep ◽  
Rock Massif ◽  
Initial Time ◽  
Creep Process ◽  
Secondary Creep ◽  
Salt Rock ◽  
Mine Shaft ◽  
Durability Analysis ◽  
Creep Models

The results of the durability analysis of a complex underground structure and surrounding multilayered rock massif are presented. The research is conducted based on an applied stress-strain state problem for a salt rock massif in the vicinity of an underground cavity of a large cross-section which is in conjunction with a mine shaft. The main aim of the research is to perform a comparative analysis of various mathematical models of the creep process. The problem is solved using finite element method to achieve this goal. Regularity in the development of deformation processes of the enclosing rock massif is established as a result of the study. According to this regularity, both primary creep and primary-secondary creep models show that the main increase of creep deformations occurs during a short initial time period after which creep strain rate decreases sharply.

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