18 Result(s)
within
Frank Liou
Mechanical Engineering
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Article
Analytical and FEM models for thermal analysis and residual stresses using wire arc-based welding and additive manufacturing of SUS304
Austenitic stainless steel, also known as SUS304, has a wide industrial application. The resultant residual stresses and deformation due to arc welding play a critical role in an in-service SUS04 part failure....
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Article
Component repair using additive manufacturing: experiments and thermal modeling
The objective of this work is to propose an advanced automated damage detection and damage reconstruction algorithm for damaged gear tooth repair. It can automate tool path design and provide precise repair vo...
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Article
An efficient predictive modeling for simulating part-scale residual stress in laser metal deposition process
Residual stress and deformation are common issues which prevent dimensional accuracy and lead early fatigue of products by laser metal deposition process. Finite element analysis is an efficient means to estim...
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Article
Temperature and residual stress distribution of FGM parts by DED process: modeling and experimental validation
Laser direct energy deposition (DED) is an advanced additive manufacturing technology, which can produce fully dense and functionally graded materials (FGMs) metal parts. Residual stress and distortion are cru...
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Article
Characteristics of Inconel 625—copper bimetallic structure fabricated by directed energy deposition
Inconel 625 (In625) is preferred under the circumstances where high strength and corrosion resistance at elevated temperatures are required. However, the restricted thermal conductivity constrains the applicat...
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Article
Effects of tool path in remanufacturing cylindrical components by laser metal deposition
Laser metal deposition as an additive manufacturing process has been widely utilized for component repair. In this study, in order to investigate the influence of tool path on characteristics of coatings for c...
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Article
Damage reconstruction from tri-dexel data for laser-aided repairing of metallic components
The laser-assisted additive manufacturing process for component repair requires the repair volume to generate the tool path for building up specific material in the worn area. This paper introduces a damage re...
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Article
Modeling analysis of argon gas flow rate’s effect on pre-mixed powder separation in laser metal deposition process and experimental validation
Pre-mixed powder is frequently used powder supply to fabricate functional gradient material by laser metal deposition (LMD). Argon gas flow blows the powder mixture following feeding pipe to melt pool in the L...
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Article
Evaluation of component repair using direct metal deposition from scanned data
In this work, the repair volume of AISI H13 tool steel samples with hemisphere-shaped defects was reconstructed through reverse engineering and the samples were repaired by laser-aided direct metal deposition ...
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Article
Damage detection and reconstruction algorithm in repairing compressor blade by direct metal deposition
Aero-engine blade repair is challenging due to its complicated geometry and unique defects after serving in a harsh environment. Traditional manual-based remanufacturing processes are not capable of yielding c...
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Article
Additive manufacturing of a new Fe-Cr-Ni alloy with gradually changing compositions with elemental powder mixes and thermodynamic calculation
It is becoming an urgent need to synthesize novel alloy possessing both corrosion resistance and sufficient plasticity to meet various functionality requirements in severe corrosion working environment. This s...
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Article
Defect classification of laser metal deposition using logistic regression and artificial neural networks for pattern recognition
Detecting laser metal deposition (LMD) defects is a key element of evaluating the probability of failure of the produced part. Acoustic emission (AE) is an effective technique in LMD defect detection. This wor...
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Article
Ti6Al4V/SS316 multi-metallic structure fabricated by laser 3D printing and thermodynamic modeling prediction
Directly, welding titanium alloy and stainless steel can cause brittle Ti-Fe intermetallics which compromise join bonds’ mechanical properties. In this research, laser 3D printing was applied to explore a new ...
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Article
Defects monitoring of laser metal deposition using acoustic emission sensor
Laser metal deposition (LMD) is an advanced additive manufacturing (AM) process used to build or repair metal parts layer by layer for a range of different applications. Any presence of deposition defects in t...
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Article
Automatic detection of depth of cut during end milling operation using acoustic emission sensor
Any shortfall in the required depth during milling machining can affect the dimensional accuracy of the part produced and can cause a catastrophic failure to the machine. Corrective remedies to fix the dimensi...
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Article
An investigation of the effect of laser deposition parameters on characteristics of multilayered 316 L deposits
A potential problem in applying the direct laser deposition (DLD) technique to material fabrication is the effect that subsequent deposited layers have on reheating previous laser deposition layers. Most of th...
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Article
Numerical simulation of the thermal history multiple laser deposited layers
Multilayer direct laser metal deposition is a fabrication process in which the parts are fabricated by creating a molten pool into which metal powder particles are injected, and a layer is laid down by moving ...
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Article
Microstructural and hardness investigation of tool steel D2 processed by laser surface melting and alloying
Several techniques can be used to improve surface properties of metals. These can involve changes on the surface chemical composition such as alloying or on the surface microstructure, such as hardening. In th...
