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tensile stress

Hyosang Yoon, Xing Xuan, Sungkwan Jeong, Jae Y Park
Electroplating of nanoporous Pt (nPt) induces an extremely strong tensile stress, which results in the exfoliation of nPt on flexible polymer substrate despite plasma treatment to improve adhesion. Here, we overcame this challenge by modifying flexible stainless-steel, and developed wearable, robust, flexible, and non-enzymatic continuous glucose monitoring system. The flexible stainless-steel was highly effective in improving the adhesion between the metal layer and substrate. The developed wireless system included electrochemical analysis circuits, a microcontroller unit, and a wireless communication module...
June 5, 2018: Biosensors & Bioelectronics
Shayan Seyedin, Sepehr Moradi, Charanpreet Singh, Joselito M Razal
This data article contains analyzed data for the article "Continuous Production of Stretchable Conductive Multifilaments in Kilometer Scale Enables Facile Knitting of Wearable Strain Sensing Textiles" (Seyedin et al., 2018) [1]. Details of wet-spinning conditions to achieve scaled-up production of stretchable and conducting polyurethane/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PU/PEDOT:PSS) multifilaments are provided. The stress-strain curves for tensile and stretch-relaxation tests on the multifilament and different knitted textile structures (plain-knit, co-knit, co-knit-alternate, co-knit with conductive stitch, and plain with non-conductive stitch) are presented...
June 2018: Data in Brief
Qi Shen, Zhanqiang Liu, Yang Hua, Jinfu Zhao, Woyun Lv, Aziz Ul Hassan Mohsan
Service performance of components such as fatigue life are dramatically influenced by the machined surface and subsurface residual stresses. This paper aims at achieving a better understanding of the influence of cutting edge microgeometry on machined surface residual stresses during orthogonal dry cutting of Inconel 718. Numerical and experimental investigations have been conducted in this research. The cutting edge microgeometry factors of average cutting edge radius S¯, form-factor K , and chamfer were investigated...
June 14, 2018: Materials
Gurcan Aral, Md Mahbubul Islam, Yun-Jiang Wang, Shigenobu Ogata, Adri C T van Duin
To avoid unexpected environmental mechanical failure, there is a strong need to fully understand the details of the oxidation process and intrinsic mechanical properties of reactive metallic iron (Fe) nanowires (NWs) under various aqueous reactive environmental conditions. Herein, we employed ReaxFF reactive molecular dynamics (MD) simulations to elucidate the oxidation of Fe NWs exposed to molecular water (H2O) and hydrogen peroxide (H2O2) environment, and the influence of the oxide shell layer on the tensile mechanical deformation properties of Fe NWs...
June 14, 2018: Physical Chemistry Chemical Physics: PCCP
Farhad Ghadami, Saeed Saber-Samandari, Gholamreza Rouhi, Mohsen Amani Hamedani, Mohammad Mehdi Dehghan, Saeed Farzad Mohajeri, Fatemeh Mashhadi-Abbas, Hossein Gholami
The main goal of this work was to investigate the effects of implants coatings' mechanical properties and morphology on the osseointegration. In order to produce different mechanical properties of coatings, two thermal spray techniques, high velocity oxy-fuel (HVOF) and air plasma spray (APS) were employed. Titanium pins were coated and implanted into the distal femurs and proximal tibias of fifteen New Zealand white rabbits, equally distributed in three study groups, and a total of twenty pins implanted in each group...
June 14, 2018: Journal of Biomedical Materials Research. Part A
Fei-Fei Li, Bo Zhang, Ji-Hong Cui, Fu-Lin Chen, Yin Ding, Xue Feng
Mechanical load application promotes bone formation, while reduced load leads to bone loss. However, the underlying mechanisms that regulate new bone formation are not fully understood. Wnt/β‑catenin signaling has an important role in bone formation, bone growth and remodeling. The aim of the present study was to investigate whether mechanical stimuli regulated bone formation through the Wnt/β‑catenin signaling pathway. Saos‑2 osteoblastic cells were subjected to mechanical strain using a Flexcell strain loading system...
June 7, 2018: Molecular Medicine Reports
M Vinoth Kumar, V Balasubramanian
Hot tensile test data of Gas Tungsten Arc Welded (GTAW) autogenous joints of Super 304HCu tubes tested at their operating temperature are presented along with the microstructure of the weld joint. The GTAW joints exhibited lower tensile strength than the parent metal and the failure occurred in the weld metal region for all test temperatures. Constant load Stress Corrosion Cracking (SCC) test data of the GTAW weld joints tested in boiling MgCl2 environment at different applied stress level are presented. SCC curves obtained from the test were analyzed to derive SCC parameters such as rate of steady state elongation, the time required for set-in of tertiary region, and time to complete fracture...
June 2018: Data in Brief
Pingguang Xu, Stefanus Harjo, Mayumi Ojima, Hiroshi Suzuki, Takayoshi Ito, Wu Gong, Sven C Vogel, Junya Inoue, Yo Tomota, Kazuya Aizawa, Koichi Akita
Neutron diffraction texture measurements provide bulk averaged textures with excellent grain orientation statistics, even for large-grained materials, owing to the probed volume being of the order of 1 cm3 . Furthermore, crystallographic parameters and other valuable microstructure information such as phase fraction, coherent crystallite size, root-mean-square microstrain, macroscopic or intergranular strain and stress, etc. can be derived from neutron diffractograms. A procedure for combined high stereographic resolution texture and residual stress evaluation was established on the pulsed-neutron-source-based engineering materials diffractometer TAKUMI at the Materials and Life Science Experimental Facility of the Japan Proton Accelerator Research Center, through division of the neutron detector panel regions...
June 1, 2018: Journal of Applied Crystallography
Martin Drexel, Yvonne Theiner, Günter Hofstetter
The present contribution deals with the experimental investigation of the time-dependent behavior of a typical overlay concrete subjected to tensile stresses. The latter develop in concrete overlays, which are placed on existing concrete structures as a strengthening measure, due to the shrinkage of the young overlay concrete, which is restrained by the substrate concrete. Since the tensile stresses are reduced by creep, creep in tension is investigated on sealed and unsealed specimens, loaded at different concrete ages...
June 12, 2018: Materials
Maria Marjorie Contreras, Christine Rabello Nascimento, Roberto Pinto Cucinelli Neto, Marysilvia F Costa, Celio A Costa
Poly(vinilidene fluoride) was characterized before and after stress relaxation by tensile tests and time-domain nuclear magnetic resonance (TD-NMR). Tensile tests were performed to provide mechanical properties, focused on the data of elastic modulus for this matter. The TD-NMR technique was used to calculate the fraction of crystalline, constrained amorphous and free amorphous phase, and the transversal relaxation time of each of these phases.
August 2018: Data in Brief
V A Burmistrov, I M Lipatova, N V Losev, J A Rodicheva, O I Koifman
The method of mechanical activation in the rotor-stator device was used to combine the starch hydrogel and the latex of the synthetic copolymer. The compatibility of the components was found to improve consistently by the preliminary mechanoactivation of the starch gel and the joint activation of the mixturs. The joint activation was shown to promote the crystallization of starch and the amorphous phase ordering of the composite. An increase in the starch content and co-activation were found to result in rise in the Young's modulus and tensile strength, but joint activation ensures an increase in the elasticity of the samples...
September 15, 2018: Carbohydrate Polymers
Hooman Shirzadi, Hassan Zohoor, Sadegh Naserkhaki
Airbags are safety devices in vehicles effectively suppressing passengers' injuries during accidents. Although there are still many cases of eye injuries reported due to eye-airbag impacts in recent years. Biomechanical approaches are now feasible and can considerably help experts to investigate the issue without ethical concerns. The eye-airbag impact-induced stresses/strains in various components of the eye were found to investigate the risk of injury in different conditions (impact velocity and airbag pressure)...
June 1, 2018: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
Julie Hughes, D Clark Dickin, He Wang
OBJECTIVES: To determine if a history of exercise involving multiaxial loading, through soccer participation, influences tibial stains during incremented load carriage. DESIGN: Cross-sectional study. METHODS: 20 female soccer players (20±1 yr) and 20 mass- and height-matched healthy women (21±1 yr) participated in walking tasks with 0kg, 10kg, 20kg, and 30kg loads on a force instrumented treadmill at 1.67m/s. Subject-specific tibial CT models were combined with subject-specific musculoskeletal models for forward-dynamic simulations and finite element analyses...
June 1, 2018: Journal of Science and Medicine in Sport
Roberto Paiella, Max G Lagally
Group-IV semiconductors, which provide the leading materials platform of micro- electronics, are generally unsuitable for light emitting device applications because of their indirect- bandgap nature. This property currently limits the large-scale integration of electronic and photonic functionalities on Si chips. The introduction of tensile strain in Ge, which has the effect of lowering the direct conduction-band minimum relative to the indirect valleys, is a promising approach to address this challenge. Here we review recent work focused on the basic science and technology of mechanically stressed Ge nanomembranes, i...
June 6, 2018: Nanomaterials
Yaoqi Xiang, Min Shen, Chao Xue, Di Wu, Yan Wang
The biomechanical behavior of human corneal stroma under uniaxial tension was investigated by the experimental analysis of cornea stromal lenticules taken out by corneal refractive surgery. Uniaxial tests were conducted to determine their stress-strain relationship and tensile strength. The Gasser-Ogden-Holzapfel (GOH) model was used to describe biomechanical behavior of the corneal stroma. The theoretical stress-strain relationship of the GOH model in the uniaxial tensile test was deduced. The corneal specimens were collected from ten patients (4 male and 6 female), aged from 17 to 36...
May 30, 2018: Journal of the Mechanical Behavior of Biomedical Materials
R D Jones, F Di Gioacchino, H Lim, T E J Edwards, C Schwalbe, C C Battaile, W J Clegg
When a material that contains precipitates is deformed, the precipitates and the matrix may strain plastically by different amounts causing stresses to build up at the precipitate-matrix interfaces. If premature failure is to be avoided, it is therefore essential to reduce the difference in the plastic strain between the two phases. Here, we conduct nanoscale digital image correlation to measure a new variable that quantifies this plastic strain difference and show how its value can be used to estimate the associated interfacial stresses, which are found to be approximately three times greater in an Fe-Ni2 AlTi steel than in the more ductile Ni-based superalloy CMSX-4® ...
June 6, 2018: Scientific Reports
Harsimrat Singh, Hemel N Modi, Samriddha Ranjan, James W R Dilley, Dimitrios Airantzis, Guang-Zhong Yang, Ara Darzi, Daniel R Leff
Robotic surgery may improve technical performance and reduce mental demands compared to laparoscopic surgery. However, no studies have directly compared the impact of robotic and laparoscopic techniques on surgeons' brain function. This study aimed to assess the effect of the operative platform (robotic surgery or conventional laparoscopy) on prefrontal cortical activation during a suturing task performed under temporal demand. Eight surgeons (mean age ± SD = 34.5 ± 2.9 years, male:female ratio = 7:1) performed an intracorporeal suturing task in a self-paced manner and under a 2 min time restriction using conventional laparoscopic and robotic techniques...
June 4, 2018: Annals of Biomedical Engineering
Jeong Hwan Lee, Su Ji Choi, Ji Hwan Kwon, Do Van Lam, Seung Mo Lee, An Soon Kim, Hion Suck Baik, Sang Jung Ahn, Seong Gu Hong, Yong Ju Yun, Young Heon Kim
We investigated the elastic modulus behavior of crystalline InAs/amorphous Al2O3 core-shell heterostructured nanowires with shell thicknesses varying between 10 and 90 nm by conducting in situ tensile tests inside a transmission electron microscope (TEM). Counterintuitively, the elastic modulus behaviors of InAs/Al2O3 core-shell nanowires differ greatly from those of bulk-scale composite materials, free from size effects. According to our results, the elastic modulus of InAs/Al2O3 core-shell nanowires increases, peaking at a shell thickness of 40 nm, and then decreases in the range of 50-90 nm...
June 5, 2018: Physical Chemistry Chemical Physics: PCCP
Bing Jiang, Jianxin Wang, Lingfeng Xu, Chengyuan Qian, Tiexin Liu, Jiayu Dai, Xueling Hou
In this paper, the effects of different melt spinning speeds on the mechanical properties of (TiZr)0.5 (Ni0.6 Cr0.1 V0.1 )2.1 amorphous ribbons were studied. Tensile tests of the specimens were used to investigate mechanical behavior and mechanical properties of amorphous ribbons. The effects of cooling rate on the glass transition temperature of amorphous ribbons was discussed. The correlation between the microstructure of serrated flow behavior in stress-strain curves and melt spinning speeds of ribbons was also evaluated...
June 4, 2018: Materials
Yiming Zhao, Nong Zhang, Guangyao Si, Xuehua Li
Fiber Bragg grating (FBG) measuring bolts, as a useful tool to evaluate the behaviors of steel bolts in underground engineering, can be manufactured by gluing the FBG sensors inside the grooves, which are usually symmetrical cuts along the steel bolt rod. The selection of the cut shape and the glue types could perceivably affect the final supporting strength of the bolts. Unfortunately, the impact of cut shape and glue type on bolting strength is not yet clear. In this study, based on direct tension tests, full tensile load⁻displacement curves of rock bolts with different groove shapes were obtained and analyzed...
June 2, 2018: Sensors
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