A5011396589- Fatigue and fracture mechanics
- Microstructure and Mechanical Properties of Steels
- High Temperature Alloys and Creep
- Metal Alloys Wear and Properties
- Aluminum Alloy Microstructure Properties
- Probabilistic and Robust Engineering Design
- Metal Forming Simulation Techniques
- Mechanical Failure Analysis and Simulation
- Metallurgy and Material Forming
- Welding Techniques and Residual Stresses
- Structural Health Monitoring Techniques
- Microstructure and mechanical properties
- Surface Treatment and Coatings
- Global Health Workforce Issues
- Surface Treatment and Residual Stress
- Non-Destructive Testing Techniques
- Various Chemistry Research Topics
- Material Properties and Failure Mechanisms
- Hydrogen embrittlement and corrosion behaviors in metals
- Industrial Vision Systems and Defect Detection
- Additive Manufacturing Materials and Processes
- Advanced Welding Techniques Analysis
- Engineering Education and Pedagogy
- Brake Systems and Friction Analysis
- Fire effects on concrete materials
Linköping University
2015-2024
Chalmers University of Technology
2018
The crack driving mechanisms in a coarse grained nickel-base superalloy RR1000 when subjected to in- and out of phase thermo mechanical fatigue are investigated. It is found that the difference growth rate between these two load conditions accounted for by different at tip region, rather than oxidation effects. This based on digital image correlation finite element analyses strain field tip, which demonstrate leads larger deformation opening. Notably, it demonstrated rates coincide...
Understanding of crack growth behaviour is necessary to predict accurate fatigue lives. Out-of-phase thermomechanical propagation tests were performed on FB2 steel used in high-temperature steam turbine sections. Testing results showed closure where the compressive part cycle affected rate. Crack closing stress was observed be different, and had more influence rate, than opening stress. rate largely controlled by minimum temperature cycle, which agreed with an isothermal test. Finite element...
Thermomechanical fatigue properties of a compacted graphite iron in an out phase configuration are investigated for different maximum temperatures and mechanical strain ranges. Furthermore, the stress–strain hysteresis loops analysed, and, particular, unloading modulus, i.e. elastic modulus measured during specimen unloading, is obtained from each cycle. This material parameter has earlier been explicitly related to amount microcracking cast irons. The results show that linearly declines...
The complicated constitutive behaviour of cast iron, involving a non-linear elastic regime, tension-compression stress asymmetry, varying modulus and an inflection in the tension-to-compression hardening curve, is investigated using micromechanical modelling approach. In this way, it demonstrated that abnormalities observed are qualitatively quantitatively explained by interaction between matrix graphite constituents. initial tension, absence linearity rationalised successive loss...
Strain-controlled out-of-phase thermo-mechanical fatigue tests at 100–500 °C and various strain ranges were conducted on five cast iron grades, including one lamellar, three compacted spheroidal graphite iron. Investigations of morphology matrix characteristics performed to associate parameters, such as geometrical features inclusions the microhardness, performance each grade. From this, life a function maximum stress half-life, is found decrease consistently with increasing average...
Exploring crack growth behaviour is needed to establish accurate fatigue life predictions. Cracked specimens were tested under strain-controlled out-of-phase thermomechanical conditions. The tests included dwell times and three different minimum temperatures. Higher temperature gave faster rates while the additions of showed no effects. Crack closure was observed in all where addition change displayed little effect on stresses. Finite element models with a sharp stationary material...
The development of fatigue life assessment models for vehicle components exposed to thermomechanical supports the establishing adequate maintenance intervals that neither cause unnecessary downtime, nor jeopardize function components. In modern automotive applications, braking is closely related safety and commonly performed with disc brakes. Failure here may result in structural damage or even breakdown loss lives. present work, cyclic response grey cast iron analysed brake discs made from...
To account for or neglect the defect position, i.e. fatigue initiating location, both radially and axially, is evaluated hourglass-shaped ultrasonic specimen. The commonly used analytical equations to calculate stress compared against a finite element (FE) based approach, which able fully considering state at position. Notably, effects on several common analyses are evaluated: strength distribution, stress–life stress–defect relationships. Fracture mechanical assessment also performed,...
The length-scale dependence of fatigue crack growth is evaluated for a set metallic materials, namely titanium Ti-6Al-4V, ductile iron EN-GJS-500-7 and tool steel AISI H13, by performing tests on geometrically similar compact C(T) specimens different sizes. With references to length-scale-invariant variables, notably the rate normalised specimen width, it demonstrated that not process tested conditions. In particular, less significant larger at longer lengths. test results also contradict...
A new accelerated creep assessment method to evaluate the performance of metals and alloys from high-temperature tensile tests, i.e. slow-strain-rate testing (SSRT), is proposed evaluated. The consists decomposing inelastic strain into a plastic component by adopting general assumptions on behaviour materials, formulated using state variable formalism verified tests with intermediate dwell times at constant stress. Either, components are considered non-interacting additive, as observed in...
Hardening of carbon steel products by austenitization and immersion in a quenching medium is widely used heat treatment to obtain hard strong martensitic structure. To avoid the undesired consequences, such as residual stresses or insufficient hardening depth, cooling rates must be accurately measured controlled. This can achieved using impinging water jet technique. The aim this work perform four low‐alloyed 70 mm cylindrical bars, technique with different flow rates, analyze its effect on...
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A general testing and analysis framework for the Step-Stress fatigue method is identified, utilizing interval-censored data maximum likelihood estimation in an effort to improve of strength distribution parameters has been performed. The method's limitations are characterized, using a simple material model that considers cumulative damage evaluate load history effects. In this way, performance including was evaluated quantified probabilistic approach with Monte-Carlo simulations, benchmarked...