A digital twin feasibility study (Part I): Non-deterministic predictions of fatigue life in aluminum alloy 7075-T651 using a microstructure-based multi-scale model

2020 ◽  
Vol 228 ◽  
pp. 106888
Author(s):  
Saikumar R. Yeratapally ◽  
Patrick E. Leser ◽  
Jacob D. Hochhalter ◽  
William P. Leser ◽  
Timothy J. Ruggles
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Feasibility Study ◽  
Scale Model ◽  
Digital Twin ◽  
Multi Scale ◽  
Aluminum Alloy 7075

FATIGUE LIFE OF ALUMINUM ALLOY 7075 – T6511 IN THE PRESENCE OF SMALL DEFECTS

2019 ◽  
Author(s):  
Vinícius Rodrigues ◽  
Natalia Gonçalves Torres ◽  
Edgar Mamiya
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Aluminum Alloy 7075

The Effects of Anodizing Process on the Corrosion rate and Fatigue Life of Aluminum Alloy 7075-T73

2020 ◽  
Vol 38 (1A) ◽  
pp. 34-42
Author(s):  
Ibrahim M. AL-Sudani ◽  
Samir A. Al-Rabii ◽  
Dhafir S. Al-Fattal
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Sulfuric Acid ◽  
Fatigue Life ◽  
Aluminum Alloys ◽  
Corrosion Rate ◽  
Stress Level ◽  
Mechanical Characteristics ◽  
Before And After ◽  
Aluminum Alloy 7075

 This research aims to study the effect of using the anodizing process on the corrosion rate, mechanical properties as well as the fatigue life for aluminum alloy (7075-T73), which is one of the most commonly used aluminum alloy in production of aircrafts, vehicles and ships structures. The anodizing process was employed through using sulfuric acid for time (20) min in a salty atmosphere. The mechanical properties and fatigue life of the AA7075-T73 were obtained before and after the anodizing process. All the results were listed in detailed tables and figures for comparison purpose. Generally, these results showed a decrease in corrosion rate by (155.06%) in comparison with untreated, an increase in hardness by (21.54%) and a slight decrease in fatigue life by (7.7%) due to anodizing for a time of 20 min at the stress level of (σa = 491.10 MPa). It was concluded that this technique could be applied on other aluminum alloys in order to know the magnitude of change in the mechanical characteristics and their fatigue life.

Evaluation of the Compatibility of High-Strength Aluminum Alloy 7075-T6 to High-Pressure Gaseous Hydrogen Environments

2018 ◽  
Author(s):  
Yuhei Ogawa ◽  
Dain Kim ◽  
Hisao Matsunaga ◽  
Saburo Matsuoka
Keyword(s):  
Fracture Toughness ◽  
High Pressure ◽  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Fatigue Life ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
High Strength ◽  
Gaseous Hydrogen ◽  
Aluminum Alloy 7075

To develop safer and more cost-effective high-pressure hydrogen tanks used in fuel cell vehicles (FCVs), the metallic materials with the following three key properties, i.e. lightweight, high strength and excellent resistance to hydrogen embrittlement should be explored. In this study, the compatibility of high-strength, precipitation-hardened aluminum alloy 7075-T6 was evaluated according to the four types of mechanical testing including slow-strain rate tensile (SSRT), fatigue life, fatigue crack growth (FCG) and fracture toughness tests in high-pressure gaseous hydrogen environments (95 ∼ 115 MPa) at room temperature. Even though numerous publications have previously reported significant degradation of the mechanical properties of 7075-T6 in some hydrogenating environments, such as moist atmosphere, the understanding with regards to the performance of this alloy in high-pressure gaseous hydrogen environments is still lacking. In SSRT tests, the alloy showed no degradation of tensile strength and ductility. Furthermore, fatigue life, fatigue crack growth and fracture toughness properties were also not degraded in hydrogen gas. Namely, it was first demonstrated that the material has big potential to be used for hydrogen storage tanks for FCVs, according to its excellent resistance to high-pressure gaseous hydrogen.

The Life Prediction of Transmission Tower Based on Multi-Scale Analysis

2014 ◽  
Vol 680 ◽  
pp. 395-398
Author(s):  
Chun Cheng Liu ◽  
Zhao Wen He ◽  
Yu Jiang Pan ◽  
Wen Qiang Li ◽  
Shang Yu Hou
Keyword(s):  
Fatigue Life ◽  
Transmission Lines ◽  
Time Course ◽  
Element Model ◽  
Scale Model ◽  
Transmission Tower ◽  
Multi Scale ◽  
Remaining Service Life ◽  
Transmission Towers ◽  
Residual Fatigue

In order to study the residual fatigue life of 500 kv transmission tower under load conditions, a multi-scale finite element model of transmission tower is established. By simulating time course of wind load, using Miner fatigue cumulative damage theory and linear S-N curve, the calculation method of transmission towers fatigue life is established. The research shows that the multi-scale model can better simulate the stress and strain state of the transmission tower, and can predict the remaining service life of the transmission tower .The research has important significance and application value for the safe operation of the transmission lines.

The Study of Introduced Electrochemical Parameters for Corrosion Fatigue Life of Aluminum

2012 ◽  
Vol 573-574 ◽  
pp. 1211-1215
Author(s):  
Xiang Qi Meng ◽  
Zhou Ying Lin
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Crack ◽  
Fatigue Life ◽  
Corrosion Fatigue ◽  
Surface Current ◽  
Stress Control ◽  
Corrosion Fatigue Crack ◽  
Electrochemical Parameters ◽  
Etched Surface ◽  
Aluminum Alloy 7075

This work introduced electrochemical parameter etched surface current intensity to mainly study corrosion fatigue life of aluminum alloy 7075 under stress control. The S-N curve of 7075 was obtained in specified corrosion media, and a new model was proposed to predict corrosion fatigue crack initiatio.

Multi-Scale Fatigue Modeling and Design Optimization of Bottom Hole Assemblies in High-DLS Applications

2020 ◽  
Author(s):  
Ke Li ◽  
Srinand Karuppoor ◽  
Sepand Ossia
Keyword(s):  
Fatigue Life ◽  
Fatigue Damage ◽  
Bending Moment ◽  
Local Strain ◽  
Scale Model ◽  
Type Model ◽  
Component Level ◽  
Multi Scale ◽  
Bottom Hole ◽  
Threaded Connections

Abstract To quantify the fatigue strength of bottom hole assembly (BHA) components used in high-bending drilling conditions, a multi-scale approach for fatigue analysis of BHAs was developed, which entails calculations at the BHA scale, the component scale, and the feature scale. At the BHA level, a beam-type model was constructed, with the BHA information and drilling parameters as the input. The calculated shear force, contact force, and bending moment were then used as the loading conditions for the finite element models at the component level, which involves drill collars and threaded connections. A local strain based fatigue damage criterion was thereafter employed to compute the fatigue life at the critical features. Part of the outcome from this multi-scale model is a relation between bending moment and fatigue life, which is inherent for each collar or each connection. This relation can then be used to design a BHA, track the fatigue damage of a BHA during operation, and perform root cause analyses if a fatigue related failure has taken place. The methodology was validated with lab experiments and field practices.

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