Elastic strain effects on catalysis of a PdCuSi metallic glass thin film

2015 ◽  
Vol 17 (3) ◽  
pp. 1746-1754 ◽  
Author(s):  
Yiyi Yang ◽  
Tuhina Adit Maark ◽  
Andrew Peterson ◽  
Sharvan Kumar
Keyword(s):  
Thin Film ◽  
Metallic Glass ◽  
Compressive Stress ◽  
Elastic Strain ◽  
Uniaxial Tensile ◽  
Glass Film ◽  
Stress Strain ◽  
Strain Effects

Electrochemical catalytic response of a palladium-based (Pd–Cu–Si) metallic glass film to mechanically imposed uniaxial tensile and compressive stress–strain.

Correction: Elastic strain effects on catalysis of a PdCuSi metallic glass thin film

2017 ◽  
Vol 19 (18) ◽  
pp. 11707-11707
Author(s):  
Yiyi Yang ◽  
Tuhina Adit Maark ◽  
Andrew Peterson ◽  
Sharvan Kumar
Keyword(s):  
Thin Film ◽  
Metallic Glass ◽  
Elastic Strain ◽  
Chem Phys ◽  
Strain Effects ◽  
Phys Chem Chem Phys

Correction for ‘Elastic strain effects on catalysis of a PdCuSi metallic glass thin film’ by Yiyi Yang et al., Phys. Chem. Chem. Phys., 2015, 17, 1746–1754.

Assessment of Springback Behaviour of 800-1200 MPa Dual-Phase Steel Grades

2021 ◽  
Vol 883 ◽  
pp. 151-158
Author(s):  
Ulas Durmaz ◽  
Sebastian Heibel ◽  
Thomas Schweiker ◽  
Marion Merklein
Keyword(s):  
Young’S Modulus ◽  
Elastic Strain ◽  
Bauschinger Effect ◽  
Young's Modulus ◽  
Strain Curve ◽  
Uniaxial Tensile ◽  
Dual Phase ◽  
Stress Strain ◽  
Dual Phase Steels ◽  
Microplastic Strain

Springback occurs in sheet metal forming due to elastic strain recovery after removal of process forces respectively after opening of the tool. For this reason, a precise description of springback requires the elastic stress-strain relationship described by the Young’s modulus as well as the internal stress distribution of the part before unloading. In this context, the Bauschinger effect influences the stress state before springback due to premature plastification during load reversal or load path change. As is well known, the stress-strain curve of a material during unloading is non-linear because of additional microplastic strain, which is reflected in a decrease of the Young’s modulus. The aim of this work is to characterize the aforementioned phenomena and their effect on springback for three dual-phase steels namely DH800, DH1000 and DP1200LY. For this purpose, cyclic tensile-compression tests as well as loading and unloading loops within uniaxial tensile tests are performed at different plastic strains. To evaluate the springback behavior of the investigated materials, two different hat-profiles geometries are investigated. By comparing the springback of dual-phase steels on part level, the significance of different material influences with regard to springback is evaluated. The results show that the investigated dual-phase steels exhibit a pronounced Bauschinger effect and a considerable amount of microplastic strain with increasing total strain. However, the comparison between the springback of the hat-profiles and the determined material parameters proves a significant influence of the elastic strain on springback, while microplastic strain and the Bauschinger effect have a minor influence.

The relaxation of compressive biaxial strains in SOS via microtwins

1989 ◽  
Vol 47 ◽  
pp. 608-609
Author(s):  
M. E. Twigg ◽  
E. D. Richmond ◽  
J. G. Pellegrino
Keyword(s):  
Thin Film ◽  
Chemical Vapor Deposition ◽  
Molecular Beam Epitaxy ◽  
Compressive Stress ◽  
Vapor Deposition ◽  
Partial Dislocation ◽  
Molecular Beam ◽  
Volume Fraction ◽  
Chemical Vapor ◽  
Silicon Thin Film

For heteroepitaxial systems, such as silicon on sapphire (SOS), microtwins occur in significant numbers and are thought to contribute to strain relief in the silicon thin film. The size of this contribution can be assessed from TEM measurements, of the differential volume fraction of microtwins, dV/dν (the derivative of the microtwin volume V with respect to the film volume ν), for SOS grown by both chemical vapor deposition (CVD) and molecular beam epitaxy (MBE).In a (001) silicon thin film subjected to compressive stress along the [100] axis , this stress can be relieved by four twinning systems: a/6[211]/( lll), a/6(21l]/(l1l), a/6[21l] /( l1l), and a/6(2ll)/(1ll).3 For the a/6[211]/(1ll) system, the glide of a single a/6[2ll] twinning partial dislocation draws the two halves of the crystal, separated by the microtwin, closer together by a/3.

scholarly journals Ability of Constitutive Models to Characterize the Temperature Dependence of Rubber Hyperelasticity and to Predict the Stress-Strain Behavior of Filled Rubber under Different Defor Mation States

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 369
Author(s):  
Xintao Fu ◽  
Zepeng Wang ◽  
Lianxiang Ma
Keyword(s):  
Experimental Data ◽  
Temperature Dependence ◽  
Mechanical Response ◽  
Constitutive Models ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Chain Model ◽  
Stress Strain ◽  
Filled Rubber ◽  
Yeoh Model

In this paper, some representative hyperelastic constitutive models of rubber materials were reviewed from the perspectives of molecular chain network statistical mechanics and continuum mechanics. Based on the advantages of existing models, an improved constitutive model was developed, and the stress–strain relationship was derived. Uniaxial tensile tests were performed on two types of filled tire compounds at different temperatures. The physical phenomena related to rubber deformation were analyzed, and the temperature dependence of the mechanical behavior of filled rubber in a larger deformation range (150% strain) was revealed from multiple angles. Based on the experimental data, the ability of several models to describe the stress–strain mechanical response of carbon black filled compound was studied, and the application limitations of some constitutive models were revealed. Combined with the experimental data, the ability of Yeoh model, Ogden model (n = 3), and improved eight-chain model to characterize the temperature dependence was studied, and the laws of temperature dependence of their parameters were revealed. By fitting the uniaxial tensile test data and comparing it with the Yeoh model, the improved eight-chain model was proved to have a better ability to predict the hyperelastic behavior of rubber materials under different deformation states. Finally, the improved eight-chain model was successfully applied to finite element analysis (FEA) and compared with the experimental data. It was found that the improved eight-chain model can accurately describe the stress–strain characteristics of filled rubber.

scholarly journals Stress–strain relationship model of glulam bamboo under axial loading

2020 ◽  
Vol 29 ◽  
pp. 2633366X2095872
Author(s):  
Yang Wei ◽  
Mengqian Zhou ◽  
Kunpeng Zhao ◽  
Kang Zhao ◽  
Guofen Li
Keyword(s):  
Tensile Stress ◽  
Compressive Stress ◽  
Failure Modes ◽  
Axial Loading ◽  
Tensile Failure ◽  
Stress Strain ◽  
Laminated Bamboo ◽  
Bamboo Scrimber ◽  
Strain Relationship ◽  
Strain Model

Glulam bamboo has been preliminarily explored for use as a structural building material, and its stress–strain model under axial loading has a fundamental role in the analysis of bamboo components. To study the tension and compression behaviour of glulam bamboo, the bamboo scrimber and laminated bamboo as two kinds of typical glulam bamboo materials were tested under axial loading. Their mechanical behaviour and failure modes were investigated. The results showed that the bamboo scrimber and laminated bamboo have similar failure modes. For tensile failure, bamboo fibres were ruptured with sawtooth failure surfaces shown as brittle failure; for compression failure, the two modes of compression are buckling and compression shear failure. The stress–strain relationship curves of the bamboo scrimber and laminated bamboo are also similar. The tensile stress–strain curves showed a linear relationship, and the compressive stress–strain curves can be divided into three stages: elastic, elastoplastic and post-yield. Based on the test results, the stress–strain model was proposed for glulam bamboo, in which a linear equation was used to describe the tensile stress–strain relationship and the Richard–Abbott model was employed to model the compressive stress–strain relationship. A comparison with the experimental results shows that the predicted results are in good agreement with the experimental curves.

scholarly journals Devitrification of thin film Cu-Zr metallic glass via ultrashort pulsed laser annealing

2021 ◽  
pp. 161437
Author(s):  
J. Antonowicz ◽  
P. Zalden ◽  
K. Sokolowski-Tinten ◽  
K. Georgarakis ◽  
R. Minikayev ◽  
...  
Keyword(s):  
Thin Film ◽  
Metallic Glass ◽  
Laser Annealing ◽  
Pulsed Laser ◽  
Pulsed Laser Annealing ◽  
Ultrashort Pulsed Laser

ZrCuAlNi thin film metallic glass grown by high power impulse and direct current magnetron sputtering

2021 ◽  
pp. 127029
Author(s):  
Niklas Bönninghoff ◽  
Wahyu Diyatmika ◽  
Jinn P. Chu ◽  
Stanislav Mráz ◽  
Jochen M. Schneider ◽  
...  
Keyword(s):  
Thin Film ◽  
Metallic Glass ◽  
Magnetron Sputtering ◽  
Direct Current ◽  
High Power ◽  
Direct Current Magnetron Sputtering
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