Parametric Study on Wind Fatigue Life of Long Span Flare-Boom Based on Directional Input Parameters to Harris Wind Spectra and Selection of Wind Blocks

2019 ◽  
Author(s):  
Sachin Samant ◽  
Rajender Agrawal ◽  
Faris Kamal ◽  
Oussama Takieddine
Keyword(s):  
Fatigue Life ◽  
Parametric Study ◽  
Long Span ◽  
Input Parameters ◽  
Selection Of

Random impact FEM simulation of irregularly-shaped media for parametric study of vibratory surface enhancement

2021 ◽  
pp. 095440542199012
Author(s):  
Jing Zhang ◽  
Joselito Yam Alcaraz ◽  
Swee-Hock Yeo ◽  
Arun Prasanth Nagalingam ◽  
Abhay Gopinath
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Parametric Study ◽  
Thermal Loading ◽  
Low Cycle Fatigue ◽  
Fem Simulation ◽  
Surface Finishing ◽  
Aerospace Materials ◽  
Surface Enhancement ◽  
Steel Balls

Aerospace materials experience high levels of mechanical and thermal loading, high/low cycle fatigue, and damage from foreign objects during service, which can lead to premature retirement. Mechanical surface treatments of metallic components, for example, fan blades and blisks, are proven to improve fatigue life, improve wear resistance and avoid stress corrosion by introducing work hardening, compressive residual stresses of sub-surface, and surface finishing. Vibropeening can enhance aerospace materials’ fatigue life involving the kinetic agitation of hardened steel media in a vibratory finishing machine that induces compressive stresses into the component sub-layers while keeping a finished surface. Spherical steel balls are the most widely used shape among steel-based media and have been explored for decades. However, they are not always versatile, which cannot access deep grooves, sharp corners, and intricate profiles. Steel ballcones or satellites, when mixed with round steel balls and other steel media (diagonals, pins, eclipses, cones), works very well in such areas that ball-shaped media are unable to reach. However, a methodology of study the effect of irregularly-shaped media in surface enhancement processes has not been established. This paper proposes a finite element-based model to present a methodology for the parametric study of vibratory surface enhancement with irregularly-shaped media and investigates residual stress profiles within a treated area of an Inconel component. The methodology is discussed in detail, which involves a stochastic simulation of orientation, impact force, and impact location. The contrasting effects of a high aspect ratio, or an edge contact, as opposed to rounded and oblique contacts are demonstrated, with further analysis on the superposition of these effects. Finally, the simulation results are compared with actual residual stress measurements and was found to have a max percent difference of 34% up to 20 [Formula: see text]m below the media surface.

Modeling of Crack Propagation Behavior of High Density Polyethylene by Using Crack Layer Theory: Parametric Study

2015 ◽  
Author(s):  
Jung-Wook Wee ◽  
Byoung-Ho Choi
Keyword(s):  
Crack Propagation ◽  
Parametric Study ◽  
High Density Polyethylene ◽  
Creep Condition ◽  
Growth Behavior ◽  
High Density ◽  
Crack Growth Behavior ◽  
Material Parameters ◽  
Input Parameters ◽  
Crack Layer

Creep and fatigue slow crack propagation of engineering thermoplastics display continuous or discontinuous manner depending on the test condition. It could be simulated accurately by use of crack layer theory with theoretical backgrounds. But many input parameters complexify the use of CL theory. Thus the investigation on the effect of material parameters on the CL growth is necessary for the comprehensive understanding. In this paper, a parametric study of CL growth simulation of single edge notched tension specimen in creep condition was performed. Several material parameters were varied so that the effect of input parameters on the CL growth behavior could be understood. Total lifetime is used to figure out the effect of the parameters quantitatively. This study would be beneficial to understand the effect of material parameters on the slow crack growth behavior of high density polyethylene.

Probabilistic Fatigue Damage Analysis of Long Span Suspension Bridge Due to Wind Induced Buffeting

2020 ◽  
Vol 980 ◽  
pp. 275-281
Author(s):  
Hu Jun
Keyword(s):  
Fatigue Life ◽  
Fatigue Damage ◽  
Time History ◽  
Suspension Bridge ◽  
Wind Load ◽  
Strong Wind ◽  
Fatigue Reliability ◽  
Long Span ◽  
Fatigue Damage Analysis ◽  
Fluctuating Wind

In order to consider the fluctuating wind load induced fatigue problem of long span suspension bridge, fatigue reliability formula is modified by assuming the fatigue life is accord with the weibull distribution. Based on the accurate bridge buffeting analysis of time history, the stress time history of components of a suspension bridge in east sea China is simulated, and then the fatigue damages and reliabilities are calculated. The results indicate that the main cables and hangers have enough fatigue reliability under the fluctuating wind load, the fatigue failure will not occur; the stiffening girder has larger fatigue damage, under 40 / (m.s-1) mean wind speed action, the girder of mid-support section’s average fatigue life is only 3.103 years, so the girder’s damage under strong wind action should be taken seriously.

Parametric study to develop an empirical correlation for undersaturated crude oil viscosity based on the minimum measured input parameters

Fuel ◽  
2014 ◽  
Vol 119 ◽  
pp. 111-119 ◽  
Author(s):  
Majda Al-Balushi ◽  
Farouq S. Mjalli ◽  
Talal Al-Wahaibi ◽  
Yahya Al-Wahaibi ◽  
Abdul Aziz Al-Hashmi
Keyword(s):  
Crude Oil ◽  
Parametric Study ◽  
Empirical Correlation ◽  
Oil Viscosity ◽  
Input Parameters ◽  
Measured Input

scholarly journals Building stock energy modeling: Feasibility study on selection of important input parameters using stepwise regression

2020 ◽  
Author(s):  
Reza Arababadi ◽  
Hariharan Naganathan ◽  
Mohsen Saffari Pour ◽  
Atefeh Dadvar ◽  
Kristen Parrish ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Stepwise Regression ◽  
Energy Modeling ◽  
Building Stock ◽  
Input Parameters ◽  
Important Input ◽  
Selection Of
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