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Showing 1-25 of 2,108 resultsfor "Index Terms":Residual Strain
"Index Terms":Residual Strain
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Analysis of Thermal Residual Stress/Strain in REBCO Coated Conductor Tapes
John Ryan C. Dizon;Arman Ray N. Nisay;Marlon James A. Dedicatoria;Rodrigo C. Munoz;Hyung-Seop Shin;Sang-Soo Oh
2G HTS coated conductor (CC) tapes are now used for electric device applications. The residual stress/strain induced in HTS coating films in CC tapes during cool down influences the critical current, Ic, and should be investigated. In this study, the thermal residual stress/strain induced in the REBCO coating film was calculated from deposition temperature (1073 K) to 77 K by thermo-mechanical ana...Show More
Numerical Analysis on Residual Stress Field of Brake Discs by Ultrasonic Shot Peening
2019 IEEE 23rd International Conference on Computer Supported Cooperative Work in Design (CSCWD)
Year: 2019 | Conference Paper |
In order to improve the lifetime of high-speed train brake disc, the ultrasonic shot peening can be used to strengthen surface made of cast steel. According to the principle of ultrasonic shot peening equipment, biased structure FEM models for single pellet and multiple pellets are established based on Johnson-Cook equation. Explicit dynamic analysis of ANSYS / LS-DYNA is used to study effects on ...Show More
High temperature full-field strain measurement based on digital image correlation during arc welding
2016 IEEE Workshop on Advanced Robotics and its Social Impacts (ARSO)
Year: 2016 | Conference Paper |
Cited by: Papers (2)
Experiments for measuring high temperature full-field strain were conducted during GTAW welding process using digital image correlation (DIC) technology. A special visual sensor system was equipped with image acquisition module. In order to reduce the influence of intense arc interference, a special laser-based illumination and filtering system was utilized. The in situ total strain close to the f...Show More
Improvement of Reversible Strain Limit for Critical Current of DI-BSCCO Due to Lamination Technique
Kozo Osamura;S. Machiya;H. Suzuki;S. Ochiai;H. Adachi;N. Ayai;K. Hayashi;K. Sato
The DI (dynamically innovative)-BSCCO-Bi2223 tapes achieved high critical current as well as high modulus of elasticity. Further the reversible strain limit and the corresponding stress for critical current have been remarkably increased by means of lamination technique. During the course of development, their optimized architecture has been designed based on the principle of the rule of mixture f...Show More
Neutron Diffraction Study on Prebending Effects for Bronze Route$rm Nb_3rm Sn$Wires Without Reinforcement
S. Awaji;H. Oguro;G. Nishijima;P. Badica;K. Watanabe;S. Harjo;T. Kamiyama;K. Katagiri
The critical current, upper critical field and critical temperature of bronze route Nb3Sn commercial wires are enhanced by applying a repeated bending strain at room temperature, i.e., "prebending strain". In order to investigate the prebending effects from a viewpoint of a residual strain, axial and lateral residual strains were evaluated directly by neutron diffraction at room temperature. We fo...Show More
Modeling of residual strain in BGA-PCB assemblies for pad cratering control
2017 16th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm)
Year: 2017 | Conference Paper |
Cited by: Papers (3)
Post-reflow residual strain is a typical thermo-mechanical phenomenon of printed circuit board assemblies (PCBA) with a large ball grid array (BGA) component after the surface mount process. In general, the post-reflow residual strain may not directly lead to the failure of solder joints, but it may result in a potential risk for another reliability concern, namely, pad cratering. Without sufficie...Show More
Influence of Deviatoric Strain for Superconducting Parameters of $\hbox{Nb}_{3}\hbox{Sn}$ Wires
Hidetoshi Oguro;Satoshi Awaji;Gen Nishijima;Petre Badica;Fumihito Shikanai;Takashi Kamiyama;Kazumune Katagiri;Kazuo Watanabe
The tensile strain dependence of the upper critical field Bc2 for Nb3Sn wires was measured using a new apparatus for applying tension at low temperature. The critical current Ic calculated from the strain-dependent Bc2 measurements is the almost consistent with the measured Ic. In the measurements by a new apparatus, the axial and the lateral applied strains were examined by the strain gauges atta...Show More
Prebending Effect on Three-Dimensional Strain in ${\rm CuNb}/({\rm Nb},\ {\rm Ti})_{3}{\rm Sn}$ Wires Under a Tensile Load
Kohki Takahashi;Hidetoshi Oguro;Satoshi Awaji;Kazuo Watanabe;Stefanus Harjo;Kazuya Aizawa;Shutaro Machiya;Hiroshi Suzuki;Kozo Osamura
Internal strains under a tensile load for CuNb/Nb3Sn wires with and without the prebending treatment were measured directly by neutron diffraction at room temperature and 7 K. The axial residual strains changed by 0.30% at room temperature and by 0.38% at 7 K to the tensile side due to the prebending treatment. The effective Poisson's ratio evaluated from the relationship between axial and lateral...Show More
Bi-stable analysis of strain hardening shells
2011 International Conference on Electric Technology and Civil Engineering (ICETCE)
Year: 2011 | Conference Paper |
Bi-stable structure can be stable in both its extended and coiled forms. For a thin shell, the plastic forming process leads to the distribution of residual stresses that cause bi-stable behavior. The associated stress distributions are analyzed, assuming a strain hardening material model, and analytical expressions for the distribution of residual stresses and stain energies of the shells in the ...Show More
Quantitative photoelastic characterization of residual strains in LEC-grown indium phosphide [100] wafers
1993 (5th) International Conference on Indium Phosphide and Related Materials
Year: 1993 | Conference Paper |
Cited by: Papers (5)
Residual strains in a 2''-diameter [100] wafer, sliced from a Fe-doped InP ingot grown by the liquid-encapsulated Czochralski method, have been characterized by measuring strain-induced birefringence. The authors present the quantitative photoelastic characterization of the residual strains and compare their two-dimensional distribution maps with the etch pit density distribution map to explore th...Show More
Effect of Residual Stress After Reflow Soldering of Ball Grid Array Mixed Solder Joint on Thermal Cycling Reliability
2023 14th International Conference on Reliability, Maintainability and Safety (ICRMS)
Year: 2023 | Conference Paper |
This study investigates the influence of residual stress after reflow soldering on the thermal cycling of a ball grid array (BGA). The devices were analyzed after thermal cycling using methods such as macroscopic morphology observation and microscopic structure evolution. The residual stress and strain of an Sn63Pb37/Sn3.0Ag0.5Cu mixed BGA structure were obtained by applying the reflow soldering t...Show More
Simulation on Residual Stress Field for Aluminum Alloy 7050-T7451 of Ultrasonic Rolling Process
2019 IEEE International Conference on Real-time Computing and Robotics (RCAR)
Year: 2019 | Conference Paper |
Cited by: Papers (1)
Ultrasonic rolling is a process of intense plastic deformation rolling under the action of a composite energy field formed by normal static pressure and high-frequency ultrasonic shock coupling. The technology can effectively improve the surface quality of parts. Proper residual compressive stress and its distribution on the machined surface can effectively improve the fatigue strength and corrosi...Show More
Three-Dimensional Strain Model on the Superconducting Properties Under the Strain for ${\rm Nb}_{3}{\rm Sn}$ Wires
It is very important for the application of high field magnets to understand the strain effect of the superconducting properties for Nb3Sn wires. We found that the axial strain dependence of the superconducting properties for various kinds of the bronze route Nb3Sn wires can be described clearly, in the case that the deviatoric and hydrostatic strains are determined experimentally as the three-dim...Show More
Research on Inherent Strain Distribution in Welded Low-Alloy Components
2014 Sixth International Conference on Measuring Technology and Mechatronics Automation
Year: 2014 | Conference Paper |
Cited by: Papers (2)
Inherent strain FEM is a recently developed numerical technique to forecast welding residual deformations. It makes use of the concept of inherent strain distribution to effectively reduce the analysis of the very complex highly nonlinear welding process to an equivalent linear elastic FEA, thus the computational cost could be significantly reduced. In this paper, the inherent strain coefficients ...Show More
A passive, in situ micro strain gauge
[1993] Proceedings IEEE Micro Electro Mechanical Systems
Year: 1993 | Conference Paper |
A passive micro strain gauge based on the strain magnification technique has been designed, demonstrated, and characterized. This strain gauge can be fabricated in situ along with active micro sensors or actuators on the same chip for monitoring residual strain effects. Both tensile or compressive strain could be easily observed under optical microscopes and the resolution of strains as small as 0...Show More
Effect of welded residual stresses on the fatigue life of structural components in two-dimensional state
The problem of low-cycle fatigue is investigated by using the local stress-strain approach. The modified rainflow counting method is adopted to obtain the loading and unloading paths as well as rainflow counting. The local stress-strain approach is extended successfull y to the two-dimensional cases by using the first principal stress and strain and the Mises equivalent stress and strain. Three mo...Show More
A Method of the Residual Stress Dynamic Measurement Research
2010 International Conference on Intelligent System Design and Engineering Application
Year: 2010 | Conference Paper |
The residual stress affects the corrosion, craze, fatigue strength mechanics performance, and so on, which strongly affects the material physics and mechanics performance as well and does harm to the structure. A method of the residual stress dynamic measurement is advanced to measure the distribution of residual stress in thick prestretched aluminum plate. In the measuring process, the dynamic re...Show More
High-spatial-resolution characterization of residual strain in commercial LEC-grown InP(100) wafers
Seventh International Conference on Indium Phosphide and Related Materials
Year: 1995 | Conference Paper |
Cited by: Papers (3)
By using a high-spatial-resolution scanning infrared polariscope, in-plane components of residual strain have been characterized quantitatively in 2"/spl phi/ LEC-grown Fe-doped InP (100) wafers. Their two-dimensional distribution maps reveal characteristic fine structures such as slip-like patterns originated from crystallographic glides during the crystal growth process, and highly-strained spot...Show More
The aim of this study is to determine the residual stress within a CZTS thin film, which causes changes to several characteristics of the thin film, including the band gap energy and lattice constants. The CZTS thin film was manufactured using a metal precursor. The crystallization of the CZTS photo absorber was confirmed by XRD analysis, Raman spectrum, and HRTEM. The energy of the band gap of th...Show More
In this paper, we derive a model to describe the important inelastic features associated with the cyclic softening, often referred to as stress softening, of soft biological tissue. The model developed here includes the notion of multiple stress–strain cycles with increasing values of the maximum strain. The model draws upon the similarities between the cyclic softening associated with carbon-fill...Show More
Accuracy Improvement of Residual Stress Measurement by Chirp Compensation of FBG
Yao Xu;Chao Duan;Zhuoshu Li;Tao Tan;Chengjun Qiu;Gui Xiao;Ye Tian;Weibin Zhang;Jianzhong Zhang
A chirp compensation method of fiber Bragg grating (FBG) is proposed to improve the residual stress measurement accuracy in the hole-drilling method. The effects of the radii of the hole, the distance between the FBG and the hole, the Young's modulus of the material, and the residual stress on the FBG chirped spectra are analyzed. The relationship between radii of the hole, the distance between th...Show More
Study of Strain and Residual Stress Distribution in the Thickness Direction by Layer Removal Method and X-Ray Diffraction
Tran Minh Tien;Nguyen Vinh Phoi;Le Chi Cuong;Luu Anh Tuyen;La Ly Nguyen
2016 3rd International Conference on Green Technology and Sustainable Development (GTSD)
Year: 2016 | Conference Paper |
Cited by: Papers (1)
Investigation of strain and residual stress in materials plays an important role in evaluation of the lifetime of machine components. Various methods have been also developed to determine the strains and residual stresses. X-ray diffraction is often used technique to measure the residual stress in the surface material, while layer removal method is common applied to determine the in-depth residual...Show More
Strain Gauge Method for Evaluating a Three-Dimensional Residual Strain State in ${\rm Nb}_{3}{\rm Sn}$ Wires
Abstract-Concerning the strain effect of superconducting properties for Nb3Sn wires, it is necessary to investigate a three-dimensional strain state that Nb3Sn superconductors truly experience in the composite wire. However, it is very difficult for Nb3Sn wires to obtain the three-dimensional residual strain components experimentally. We adopted the strain gauge that is directly glued onto the 1 m...Show More
Simulation and Analysis of Residual Stress and Tool Wear in Mechanical Repeated Ruling Process
2019 IEEE International Conference on Mechatronics and Automation (ICMA)
Year: 2019 | Conference Paper |
In order to study the superiority of mechanical repeated ruling grating blank compared with single mechanical ruling, the residual stress and tool wear are analyzed in this paper. In this paper, the residual stress theory of mechanical repeated ruling is first established, and then four groups of single factor test methods with constant total ruling depth are adopted in combination with the finite...Show More
Measurements of the Strain Dependence of Critical Current of Commercial REBCO Tapes at 15 T Between 4.2 and 40 K for High Field Magnets
Federica Pierro;Mario Delgado;Luisa Chiesa;Xiaorong Wang;Soren O. Prestemon
Interest for high magnetic fields (>16 T) for applications in high energy physics (HEP) and fusion machines, requires the development of high current cables capable to withstand the large forces, mechanical and electromagnetic, experienced during manufacturing and operations. The critical current $(I_{{\rm{c}}})$ of REBCO tapes depends on strain, magnetic fields, and operational temperatures. Unde...Show More
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