scholarly journals Finding Minimal Optimal Indent Separation for Polystyrene via Instrumental Nanoindentation and FEA Method

2020 ◽  
Vol 10 (12) ◽  
pp. 4262
Author(s):  
Chulin Jiang ◽  
Michael Davis ◽  
Jurgita Zekonyte
Keyword(s):  
Mechanical Properties ◽  
Indentation Depth ◽  
Optimal Separation ◽  
Maximum Indentation Depth ◽  
Submicron Scale ◽  
The Matrix ◽  
Different Depths ◽  
Set Up ◽  
The Relationship ◽  
Non Destructive

Nanoindentation became a standard non-destructive technique to measure mechanical properties at the submicron scale of various materials. A set of empirical rules were established to guarantee the validity of the results. One of those rules is the separation between individual indents that should be 20–30 times maximum indentation depth. This paper investigates the influence of the distance between indents on the accuracy of mechanical properties for polystyrene with a view to determine minimum optimal separation that is needed to measure various material properties. A series of different depths with three different orientations was considered through both the experimental and finite element method to explore the relationship between the distance and indentation depth. Both methods demonstrated that hardness and modulus values for polystyrene keep stable with the distance approximately 15 times the maximum indentation depth for the matrix type set up, and nominal separation of 10 is enough when indents are executed in a single row or column.

scholarly journals Study on σ Phase in Fe–Al–Cr Alloys

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1092 ◽  
Author(s):  
Jintao Wang ◽  
Shouping Liu ◽  
Xiaoyu Han
Keyword(s):  
Mechanical Properties ◽  
Grain Boundaries ◽  
Grain Growth ◽  
Thermodynamic Calculation ◽  
Second Phase ◽  
Σ Phase ◽  
Austenitic Transformation ◽  
The Matrix ◽  
The Relationship

In this paper, a method of using the second phase to control the grain growth in Fe–Al–Cr alloys was proposed, in order to obtain better mechanical properties. In Fe–Al–Cr alloys, austenitic transformation occurs by adding austenitizing elements, leading to the formation of the second phase and segregation at the grain boundaries, which hinders grain growth. FeCr(σ) phase was obtained in the Fe–Al–Cr alloys, which had grains of several microns and was coherent and coplanar with the matrix (Fe2AlCr). The nucleation of σ phase in Fe–Al–Cr alloy was controlled by the ratio of nickel to chromium. When the Ni/Cr (eq) ratio of alloys was more than 0.19, σ phase could nucleate in Fe–Al–Cr alloy. The relationship between austenitizing and nucleation of FeCr(σ) phase was given by thermodynamic calculation.

Comparison of Shear, Compressive and Tensile Characteristics of Cast Irons

1973 ◽  
Vol 15 (1) ◽  
pp. 53-60 ◽  
Author(s):  
R. D. Adams ◽  
M. A. O. Fox
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Design Criteria ◽  
Matrix Structure ◽  
Proof Stress ◽  
Cast Irons ◽  
The Matrix ◽  
The Relationship ◽  
Graphite Inclusions ◽  
Strength And Ductility

Cast irons were produced with variations in the quantity and shape of the free graphite inclusions and in the matrix structure to investigate the relationship between the shear, compressive and tensile mechanical properties. Differences were observed which may have a significant effect on design criteria for cast irons. For example, the ratio of shear to tensile strengths decreased from about 1·25 to 0·577 and the ratio of 0·1 per cent proof stress in compression to that in tension decreased from approximately 2 to 11 as the tensile strength (and ductility) were increased.

scholarly journals Determination of the Mechanical Properties of PIN–PMN–PT Bulk Single Crystals by Nanoindentation

Crystals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 28
Author(s):  
Weiguang Zhang ◽  
Jijun Li ◽  
Yongming Xing ◽  
Fengchao Lang ◽  
Chunwang Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Single Crystals ◽  
Indentation Depth ◽  
Young’S Moduli ◽  
Indentation Process ◽  
Maximum Indentation Depth ◽  
Elastic And Plastic Deformations ◽  
Bulk Single Crystals

The present study aimed to experimentally evaluate the mechanical properties of Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 (PIN–PMN–PT) bulk single crystals with different crystallographic directions using the nanoindentation technique. The load–indentation depth curves, elastic and plastic deformations, hardnesses, and Young’s moduli of [100]- and [110]-oriented 0.28PIN–0.43PMN–0.29PT bulk single crystals were investigated. Our results show that with an increase in the maximum indentation depth hmax, the plastic residual percentage increased for both the [100]- and the [110]-oriented single crystals. At each hmax, the plastic residual percentage of the [100]-oriented PIN–PMN–PT single crystals was less than that of the [110]-oriented PIN–PMN–PT single crystals. At hmax from 500 nm to 2000 nm, the plastic deformation was larger than the elastic deformation, and the plastic residual percentage was larger than 50% for both the [100]- and the [110]-oriented single crystals. This means that the plastic deformation dominated in the indentation process of PIN–PMN–PT single crystals. The indentation size effect on the hardness of the PIN–PMN–PT single crystals was apparent in the nanoindentation process. Both the hardness and the Young’s modulus of the [100]-PIN–PMN–PT single crystals were greater than those of the [110]-PIN–PMN–PT single crystals, which indicates that the PIN–PMN–PT single crystals had anisotropic mechanical characteristics.

Analytical Study on Micro-Indentation Method to Integrity Evaluation for Graphite Components in HTGR

2006 ◽  
Author(s):  
Junya Sumtia ◽  
Satoshi Hanawa ◽  
Taiju Shibata ◽  
Tatsuya Tada ◽  
Tatsuo Iyoku ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Indentation Depth ◽  
Analytical Study ◽  
Indentation Load ◽  
Strain Condition ◽  
Indentation Method ◽  
Properties Of Materials ◽  
Oxidized Graphite ◽  
The Relationship ◽  
Micro Indentation

An analytical study on micro-indentation method to integrity evaluation for graphite components was carried out. The indentation method is used as simplicity test to measure mechanical properties of materials. This method is thought to be applicable to evaluate the residual stress from the relationship between indentation load and indentation depth. In this study, in order to confirm the applicability of the micro-indentation method for lifetime evaluation of the graphite component, indentation load-depth behavior under stress/strain condition was evaluated taking account of the specified minimum ultimate strength of IG-110 graphite. Moreover, analytical investigations of indentation load-depth behavior for oxidized graphite and oxidized graphite with residual strain were also carried out. As a result, it can be said that the indentation method is potentially applicable to evaluate the integrity of graphite components.

Material Report in Support to RCC-MRx Code 2010: Stainless Steel Parts and Products

2011 ◽  
Author(s):  
Olivier Ancelet ◽  
Thierry Lebarbe´ ◽  
Sophie Dubiez-Le Goff ◽  
Dominique Bonne ◽  
Odile Ge´lineau
Keyword(s):  
Mechanical Properties ◽  
Stainless Steels ◽  
Vacuum Vessel ◽  
The Status ◽  
Repair Procedure ◽  
The Subject ◽  
Set Up ◽  
Under Construction ◽  
Design Calculations ◽  
Non Destructive

This paper presents the Material Report dedicated to stainless steels parts and products issued by AFCEN (Association Franc¸aise pour les re`gles de Conception et de Construction des Mate´riels des Chaudie`res Electro-Nucle´aires) in support to RCC-MRx 2010 Code. The RCC-MRx Code is the result of the merger of the RCC-MX 2008, developed in the context of the research reactor Jules Horowitz Reactor project, in the RCC-MR 2007, which set up rules applicable to the design of components operating at high temperature and to the Vacuum Vessel of ITER (a presentation of RCC-MRx 2010 Code is the subject of another paper proposed in this Congress; it explains in particular the status of this Code). This Material Report is part of a set of Criteria of RCC-MRx (this set of Criteria is under construction). The Criteria aim at explaining the design and construction rules of the Code. They cover analyses rules as well as part procurement, welding, methods of tests and examination and fabrication rules. The Material Report particularly provides justifications and explanations on requirements and features dealing with parts and products proposed in the Code. The Material Report contains the following information: Introduction of the grade(s): codes and standards and Reference Procurement Specifications covering parts and products, applications and experience gained, • Physical properties, • Mechanical properties used for design calculations (base metal and welds): basic mechanical properties, creep mechanical properties, irradiated mechanical properties, • Fabrication: experience gained, metallurgy, • Welding: weldability, experience gained during welding and repair procedure qualifications, • Non-destructive examination, • In-service behaviour. In the article, examples of data supplied in the Material Report dedicated to stainless steels will be exposed.

scholarly journals Investigation of Mechanical Properties of Low-Density Polyethylene with Copper Nanoparticles

2021 ◽  
Vol 15 ◽  
pp. 181-188
Author(s):  
M. V. Klychnikova ◽  
Kyaw Ye Ko
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Filler Content ◽  
Physical And Mechanical Properties ◽  
Ex Situ ◽  
Flow State ◽  
In Situ Preparation ◽  
The Matrix ◽  
The Relationship

In this work, it is shown that the method of the in situ preparation of Cu/LLDPE by combining the formation of a composite and a nanodispersed phase in the viscous-flow state of a polymer makes it possible to achieve a uniform distribution of nanoparticles in the matrix and effectively regulate their mechanical and functional properties. The optimal concentration of Cu nanofiller was found to be 2-5%, allowing to achieve the best mechanical properties. Comparative analysis of the physical and mechanical properties of Cu/LLDPE nanocomposites obtained by various methods shows that the deformation and strength characteristics of the 3CuLLDPE nanocomposite obtained by the in situ method are improved in comparison with the properties of the 3CuLLDPE nanocomposite, prepared by ex situ method. The relationship between the filler content and the modulus of elasticity/tensile strength has been determined. With an increase in the filler content, the elastic modulus increases by 10-20%, and the tensile strength decreases by 30%. Elongation at break for samples with nanofiller content up to 3 wt. % higher than unfilled polymer

scholarly journals Determination of DynamicElastic Properties of Anah Formation, Near Rawa city / Western Iraq Using Ultrasonic Technique

2020 ◽  
pp. 1672-1683
Author(s):  
Salman Z. Khorshid ◽  
Munther D. Al-Awsi ◽  
Emad H. Kadhim
Keyword(s):  
Elastic Properties ◽  
Dynamic Properties ◽  
Ultrasonic Method ◽  
S Wave ◽  
Wave Velocities ◽  
A Value ◽  
Different Depths ◽  
The Relationship ◽  
Non Destructive

The aim of the current  study is to determine the elastic properties  of carbonate rocks using ultrasonic method.  Forty rock samples of  Anah formation  were collected at  different depths from  four wells drilled at the study area . The relationship between wave velocities and elastic properties of rocks was defined. Regression analyses to define these relations were applied. The results indicate that the elastic properties of the rocks show a linear relationship with both P- and S-wave velocities. The best relationship was obtained between both Young's modulus and Shear modulus with Vs in the determination of the coefficient ( R2  ), with values of 0.91 and 0.94,  respectively.  Bulk modulus and  Lame’s constant were  better correlated with Vp than with Vs  in the determination of R2,with values of 0.92 and 0.83, respectively. Poisson’s ratio  showed a good correlation using the ratio of Vp/Vs in the determination of R2, with a value of 0.81. The main output of this  study shows that the ultrasonic method is a useful tool for the prediction of the elastic dynamic properties of sample rocks and that it can be used as an economical , simple and  non- destructive method, especially for engineering purposes.    

Rheology, Mechanical Performance and Penetrability through Flax Nonwoven Fabrics of Lime Pastes

2022 ◽  
Author(s):  
Ali Rakhsh Mahpour ◽  
Monica Ardanuy ◽  
Heura Ventura ◽  
Joan Ramon Rosell ◽  
Josep Claramunt
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Construction Materials ◽  
Short Fibers ◽  
Plant Fibers ◽  
Nonwoven Fabrics ◽  
The Matrix ◽  
Negative Effect ◽  
Long Fibers ◽  
The Relationship

The use of plant fibers as a reinforcement for fragile matrices could be an option to improve the sustainability of the construction materials. These reinforcements can be in different forms as short fibers, long fibers or woven or nonwoven fabrics. The mechanical performance of the composites is significantly related to the adhesion between the matrix and the fibers. In the case of nonwoven reinforcement, to get good adhesion, the penetration of the paste is a key point. That is why this study addresses the relationship between rheology, penetration through the nonwoven fabrics and the mechanical properties of various lime pastes with different contents of water and metakaolin (MK). The effect of the binder’s grinding is also evaluated. The results indicate that MK pastes with higher w/b ratios penetrate better into nonwovens, Grinding has a negative effect on penetrability despite improving the mechanical properties of the pastes.

Sign in / Sign up

Export Citation Format

Share Document