Article
Materials Science, Multidisciplinary
G. S. Schajer
Summary: This research developed a numerical method to correct for the effects of hole eccentricity, allowing for a larger range of eccentricity. By computing the strain response under a centered hole based on experimental strain measurements from an eccentric hole, the proposed method significantly increased the allowable maximum size of hole eccentricity compared to measurements without error correction.
EXPERIMENTAL MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
M. D. Olson, A. T. DeWald, M. R. Hill
Summary: Measurement precision and uncertainty estimation are crucial for residual stress measurement techniques. This study focused on the precision of hole-drilling residual stress measurement and developed an updated uncertainty estimator. Repeatability studies conducted on aluminum and titanium plates showed larger standard deviations at the surface that decay quickly with depth. Manual milling machines resulted in larger repeatability standard deviations compared to automated machines.
EXPERIMENTAL MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
D. S. da Silva, F. Lutckmeier, I. L. Diehl, C. A. T. S. Diehl, T. R. S. de Lima, T. G. R. Clarke, M. T. P. Paes
Summary: The objective of this study is to develop a methodology to extend the measurement depth of ICHD in tensile armor wires. Numerical and experimental studies were conducted to determine specific calibration coefficients, and the results were validated through experiments. The extended ICHD method was found to accurately measure the residual stress distribution in tensile armor wires.
EXPERIMENTAL MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
G. S. Schajer
Summary: This study proposed a residual stress computation scheme that can be implemented straightforwardly and efficiently, providing the needed calibration data. By recasting the optical data into a compact arrangement and exploring several computation variants, effective computation of residual stresses was achieved with different advantages in various scenarios.
EXPERIMENTAL MECHANICS
(2021)
Article
Construction & Building Technology
Yang Peng, Jun Zhao, Lan-shu Chen, Jun Dong
Summary: In this study, the combination of DIC and hole-drilling method was used to measure residual stress in full-scale steel components, providing theoretical expressions and coefficient estimation using the FE method. The results indicate that the DIC-hole drilling method is feasible and accurate for measuring residual stress, particularly in regions around the drilled hole, with an accuracy of about 10% for measured residual stress greater than 100 MPa.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Ahmad Reza Ghasemi, Ali Tabatabaeian
Summary: Three experimental measurement methods, namely 'hole drilling', 'slitting', and 'curvature' methods, were considered to evaluate residual stresses in laminated polymer composite materials. The hole drilling technique is suitable for measuring stresses in the near-surface areas of the structures, the slitting method is employed to assess stresses through the depth of specimens, and the curvature method shows great potential for estimating the overall residual stress quality in laminated composites with un-symmetrical configurations.
MECHANICS OF MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
T. C. Smit, R. G. Reid
Summary: This study develops and demonstrates an approach to constrain the solution of the regularized integral method using data from complementary measurement techniques. The results show that incorporating XRD data into IHD results reduces uncertainty near the surface and allows the advantages of both techniques to be utilized to the fullest extent.
EXPERIMENTAL MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
G. S. Schajer
Summary: The study aimed to develop a numerical adjustment scheme to accommodate variations in strain gauge length and width and enable the use of publicly available calibration data provided in E837-20 for general rosette types.
EXPERIMENTAL MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
G. S. Schajer, L. To
Summary: The study aimed to develop a practical method for simulating an infinite boundary in finite element models using an outer ring boundary to create a more compact and computationally efficient model. The research involved developing mathematical formulas specifying the material properties of the outer ring and conducting calibration calculations using different loading models. Results showed that the boundary ring is effective in simulating deformations around a stressed hole, which is useful for computing the calibration coefficients needed for hole-drilling residual stress measurements.
EXPERIMENTAL MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Xiaodong Liu, Xiaodong Wang, Zhidong Guan, Ting Jiang, Kunhao Geng, Zengshan Li
Summary: This paper enhances the incremental hole-drilling (IHD) method for calculating in-plane stress distribution in composite laminates. An experiment was conducted to validate the accuracy and efficiency of the improved IHD method, showing good agreement with finite element method (FEM) simulation results.
MECHANICS OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
D. Halabuk, T. Navrat
Summary: This study proposes a novel method for evaluating uniform residual stresses in cylindrical bodies by simulating different residual stress states in cylindrical bodies and using the method described in ASTM E837 standard for evaluation. The four sets of calibration coefficients in the new procedure show a negligible relative error in evaluating residual stresses.
EXPERIMENTAL MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Abba A. Abubakar, Akeem Yusuf Adesina, Abul Fazal M. Arif, Jafar Albinmousa, Khaled S. Al-Athel, S. Sohail Akhtar
Summary: This study evaluates the residual stress in Ni-based metallic coatings deposited on stainless steel substrate using a direct current plasma spray torch by combining hole drilling and micro-indentation techniques. The findings show that the residual stress significantly influences the adhesion strength of the thick metallic coating layers.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Mechanical
Jun Wu, Bin Qiang, Xiaoxuan Liao, Yanmei Huang, Changrong Yao, Yadong Li
Summary: This paper proposes a method that uses a convolutional neural network to correct for the hole-drilling method eccentricity error. By simulating the measurement process and training the neural network, the strain measurement error can be effectively predicted and corrected, thereby improving the accuracy of residual stress measurement.
JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN
(2023)
Article
Engineering, Civil
Yadong Li, Jun Wu, Bin Qiang, Siting Zhou, Weiqin Liu, Changrong Yao
Summary: This study investigated the influence of different strain release coefficient calibration methods on the measurement results of welding residual stress, finding that high-value WRSs are significantly overestimated when calibrated using the formula method and experiment. Consideration of stress biaxiality revealed specific distribution trends of WRSs on an orthotropic steel deck.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Claudia Barile, Simone Carone, Caterina Casavola, Giovanni Pappalettera
Summary: Incremental hole drilling is a valuable tool for measuring surface and sub-surface residual stresses. However, the fitting of strain measurements using polynomials or splines is subject to user experience, which introduces uncertainty to the calculated stresses. This study evaluates the uncertainty associated with strain fitting using Gaussian Process Regression (GPR) and validates the proposed methodology using laser shock peened AA 7050-T7451 specimens. The GPR-based approach demonstrates its ability to successfully discriminate different strain signal sources.
Article
Materials Science, Multidisciplinary
Qiong Chen, Brandon S. McKeon, Sunny Y. Zhang, Fan Zhang, Changkui Hu, Timothy H. Gfroerer, Mark W. Wanlass, David J. Smith, Yong Zhang
Summary: This study uses a variety of spatially resolved techniques to investigate dislocation defects in GaAs solar cells, providing a quantitative and definitive correlation between the atomistic structure of defects and their effects on device performance, offering unprecedented insight into defect physics.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Crystallography
Allison Boley, Esperanza Luna, C. Zhang, N. Faleev, C. B. Honsberg, David J. Smith
Summary: Studies on epitaxial GaP/Si heterostructures grown by MBE and MEE using ACSTEM revealed significant interfacial intermixing and a wide interface width, which will impact theoretical predictions of charge imbalance and strong electric fields across the heterointerface.
JOURNAL OF CRYSTAL GROWTH
(2021)
Article
Engineering, Electrical & Electronic
Prudhvi Peri, Kai Fu, Houqiang Fu, Yuji Zhao, David J. Smith
Summary: The effects of etching treatment on GaN-on-GaN structures for power device applications were investigated in this study. It was found that optimizing surface etching techniques is important to avoid degraded performance in devices that require regrowth of GaN. Devices with fast-etch-only treatment showed lower breakdown voltages compared to those with multiple etching steps, where no interfaces were visible and the breakdown voltages were significantly higher.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Review
Materials Science, Coatings & Films
Yong-Hang Zhang, David J. Smith
Summary: This article provides an overview of research on zincblende II-VI/III-V heterostructures, focusing on several novel device applications based on these materials. The study found that by combining materials with small lattice mismatch, highly crystalline epitaxial films with almost defect-free heterostructures could be grown.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2021)
Article
Nanoscience & Nanotechnology
Pallabi Pramanik, Sayantani Sen, Chirantan Singha, A. Bhattacharyya, Lin Zhou, David J. Smith
Summary: This study reports on the development of deep-ultraviolet wavelength-selective top-illuminated photodetectors based on AlGaN/AlN quantum-dots-in-wells. The research focused on the impact of variation in the group III to group V flux ratio and the use of indium as a surfactant on UV photoresponse. Photodetectors grown under near-stoichiometric conditions exhibited a photocurrent peak in the 210-215 nm range, while those grown under excess group III conditions showed a redshifted peak at around 225 nm with significantly higher responsivity. The enhancement in performance was attributed to the formation of quantum dots with truncated pyramidal structures with near-uniform size distribution and density.
Article
Energy & Fuels
Hadi Afshari, Brandon K. Durant, Tristan Thrasher, Logan Abshire, Vincent R. Whiteside, Shun Chan, Dongyoung Kim, Sabina Hatch, Mingchu Tang, Jeremiah S. McNatt, Huiyun Liu, Martha R. McCartney, David J. Smith, Ian R. Sellers
Summary: The high radiation tolerance of GaAs1-xSbx based solar cells for the low-intensity-low-temperature conditions of Saturn, Jupiter, and Mars is demonstrated. The cells exhibit significant resistance to high energy electron environment on these target planets, with an unusual increase in short circuit current at low temperature. The open circuit voltage and fill factor of the cells are especially tolerant to irradiation, reflected in unchanged dark current-voltage characteristics particularly at LILT.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Chemistry, Multidisciplinary
Ido Levy, Candice Forrester, Haiming Deng, Manuel Roldan-Gutierrez, Martha R. McCartney, David J. Smith, Christophe Testelin, Lia Krusin-Elbaum, Maria C. Tamargo
Summary: Magnetic topological insulators have promising potential for topological spintronics and quantum computing. This study investigates the growth of (Sb2Te3)(1-x)(MnSb2Te4)(x) layers and reveals that by controlling the growth conditions, the incorporation of Mn as a structural component can be enhanced.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Physics, Applied
Tobias Hadamek, Agham B. Posadas, Fatima Al-Quaiti, David J. Smith, Martha R. McCartney, Eric Dombrowski, Alexander A. Demkov
Summary: In this study, thin Ga2O3 films were successfully deposited on SrTiO3 and Si substrates using plasma-assisted molecular beam epitaxy. The orientation and structural alignments of the grains were examined, providing a high-quality seed layer for further epitaxial growth.
JOURNAL OF APPLIED PHYSICS
(2022)
Review
Physics, Condensed Matter
Yong Zhang, David J. Smith
Summary: In this article, a new approach to defect study is introduced, which involves a sequential mode application of spatially-resolved optical, electrical, and structural characterization techniques on fabricated devices. This approach provides definitive answers to questions regarding the impact of individual defects on device performance, the dependence of this impact on device operating conditions, and the variation of this impact between different defects.
JOURNAL OF SEMICONDUCTORS
(2022)
Article
Nanoscience & Nanotechnology
Samreen Khan, Frank Angeles, John Wright, Saurabh Vishwakarma, Victor H. Ortiz, Erick Guzman, Fariborz Kargar, Alexander A. Balandin, David J. Smith, Debdeep Jena, H. Grace Xing, Richard Wilson
Summary: The study aims to investigate the impact of bulk vibrational properties and interfacial structure on thermal transport at interfaces in wide band gap semiconductor systems. The results suggest that thermal conductance depends on the bulk phonon properties of the softer material and the interfacial structure, rather than just the vibrational similarity between the two materials.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Electrical & Electronic
W. W. Pan, R. J. Gu, Z. K. Zhang, W. Lei, G. A. Umana-Membreno, D. J. Smith, J. Antoszewski, L. Faraone
Summary: In this study, strained CdZnTe/CdTe superlattice layers were used as dislocation filtering layers to reduce the threading dislocation density in CdTe buffer layers. The results showed that the dislocation density could be effectively reduced to below the critical level by optimizing the Zn content and thermal annealing. The DFL approach offers the advantages of lower dislocation density and better lattice-matching with HgCdTe, making it a promising path for achieving heteroepitaxy of high-quality HgCdTe on large-area lattice-mismatched substrates for next-generation infrared detectors.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Prudhvi Peri, Kai Fu, Houqiang Fu, Jingan Zhou, Yuji Zhao, David J. Smith
Summary: The morphology of GaN substrates grown by HVPE and by ammonothermal methods was observed to have an impact on the performance of GaN-on-GaN p-i-n diodes. HVPE-grown substrates showed ordered surface features, while ammonothermal substrates did not. Diodes fabricated on HVPE substrates had higher reverse-bias voltages compared to those on ammonothermal substrates.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Coatings & Films
Daniel C. Messina, Kevin A. Hatch, Saurabh Vishwakarma, David J. Smith, Yuji Zhao, Robert J. Nemanich
Summary: Two atomic layer etching methods were investigated for crystalline GaN, involving oxidation, fluorination, and ligand exchange. The etching process was monitored in situ using multiwavelength ellipsometry and characterized through X-ray photoelectron spectroscopy. The results revealed the presence of fluorine and oxygen impurities on the etched surfaces, a slight reduction in thickness, and a lower removal rate than predicted. The observed reduced etch rates were attributed to the ordered structure of the oxide formed on the crystalline GaN surfaces.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Nanoscience & Nanotechnology
Abhinandan Gangopadhyay, Chaomin Zhang, Aymeric Maros, Nikolai Faleev, Richard R. King, Christiana B. Honsberg, David J. Smith
Summary: The atomic-scale structure of extended defects in GaAs/GaAs1-xSbx/GaAs (001) heterostructures has been investigated using aberration-corrected scanning transmission electron microscopy. Two types of defects were identified: a dissociated screw dislocation or a partial dislocation dipole at the tensile-strained GaAs(cap)/GaAs0.34Sb0.66 interface, and a dissociated 90 degrees dislocation at the compressively-strained GaAs0.91Sb0.09/GaAs(substrate) interface. The intrinsic stacking faults associated with these defects were bounded by Shockley partial dislocations.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Suho Park, Martha R. McCartney, David J. Smith, Jiyeon Jeon, Yeongho Kim, Sang Jun Lee
Summary: An inverted structure InGaAsP/InGaAs dual-junction solar cell with enhanced photovoltaic conversion efficiency has been demonstrated by utilizing a metamorphic InAsxP1-x structure.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
