Mechanical Properties of Metallic Thin Films: Tensile Tests vs. Indentation Tests

2003 ◽  
Vol 782 ◽  
Author(s):  
Nian Zhang ◽  
Changjin Xie ◽  
Wei Tong
Keyword(s):  
Thin Films ◽  
Test Data ◽  
Indentation Test ◽  
Tensile Tests ◽  
Equivalent Strain ◽  
Model Material ◽  
Polycrystalline Materials ◽  
Metallic Thin Films ◽  
Element Analysis ◽  
Indentation Tests

ABSTRACTThe existing interpretations of indentation test data (either theoretical or numerical approaches) have been largely based on isotropic plasticity models of polycrystalline materials while most of the metallic thin films widely used in many microelectronic and MEMS applications are strongly textured with a few grains or only a single grain running through the thickness of the films. The multicrystalline nature of the thin films on correlating their indentation and tensile properties is the focus of our investigation. Using multicrystalline aluminum and copper alloy thin sheets as model material systems, both tensile tests and indentation tests were performed and the testing results were compared based on a 3D crystal plasticity finite element analysis. The correlation between the indentation data and the tensile test data (at an effective or equivalent strain) is critically examined for these two multicrystalline materials.

ELASTO-PLASTIC PROPERTIES OF Mo-MODIFIED Ti DEDUCED FROM INDENTATION TESTS AND FINITE ELEMENT ANALYSIS

2019 ◽  
Vol 26 (07) ◽  
pp. 1850225
Author(s):  
YONG MA ◽  
ZHAO YANG ◽  
SHENGWANG YU ◽  
BING ZHOU ◽  
HONGJUN HEI ◽  
...  
Keyword(s):  
Finite Element ◽  
Surface Treatment ◽  
Load Capacity ◽  
Indentation Test ◽  
Element Analysis ◽  
Plastic Properties ◽  
Polynomial Expression ◽  
Indentation Tests ◽  
Graded Material ◽  
Micro Indentation

The aim of this paper is to establish an approach to quantitatively determine the elasto-plastic parameters of the Mo-modified Ti obtained by the plasma surface alloying technique. A micro-indentation test is conducted on the surface under 10[Formula: see text]N. Considering size effects, nanoindentation tests are conducted on the cross-section with two loads of 6 and 8[Formula: see text]mN. Assuming nanoindentation testing sublayers are homogeneous, finite element reverse analysis is adopted to determine their plastic parameters. According to the gradient distributions of the elasto-plastic parameters with depth in the Mo-modified Ti, two types of mathematical expressions are proposed. Compared with the polynomial expression, the linear simplified expression does not need the graded material to be sectioned and has practical utility in the surface treatment industry. The validation of the linear simplified expression is verified by the micro-indentation test and corresponding finite element forward analysis. This approach can assist in improving the surface treatment process of the Mo-modified Ti and further enhancing its load capacity and wear resistance.

Determination of High-Temperature Creep Property of High-Cr Steel Based Upon Indentation Test

2015 ◽  
Author(s):  
Masayuki Arai ◽  
Takahiro Ishikawa ◽  
Yukio Takahashi ◽  
Tomohisa Kumagai
Keyword(s):  
High Temperature ◽  
Creep Property ◽  
Indentation Test ◽  
Indentation Load ◽  
High Temperature Creep ◽  
Element Analysis ◽  
Temperature Creep ◽  
Inner Pressure ◽  
Indentation Tests ◽  
Actual Response

In this paper, the procedure which can estimate creep exponent and coefficient in Norton’s law from the impression size rather than the penetration depth is discussed based upon a high-temperature creep indentation test. Firstly, an analytical solution related to the change in impression size with dwelling time at an indentation load is formulated by solving problem of infinite creeping media embedding spherical cavity subjected to an inner pressure which characterizes an indentation load. The applicability of the formula to elastic-plastic-creeping model resembling an actual response is checked by conducting non-linear finite-element analysis combined with contact option. Finally, creep indentation tests are conducted for a high-Cr ferritic heat-resisting steel. It is shown that the creep parameters at a lower stress level can be estimated at temperature 873K.

High-Temperature Creep Property of High-Cr Ferritic Heat-Resisting Steel Identified by Indentation Test

2016 ◽  
Vol 139 (2) ◽  
Author(s):  
Masayuki Arai
Keyword(s):  
High Temperature ◽  
Creep Property ◽  
Indentation Test ◽  
Indentation Load ◽  
High Temperature Creep ◽  
Element Analysis ◽  
Temperature Creep ◽  
Inner Pressure ◽  
Indentation Tests ◽  
Actual Response

In this paper, the procedure which can estimate creep exponent and coefficient in Norton's law of the miniature sample from the impression size rather than the penetration depth is discussed based upon a high-temperature creep indentation test. First, an analytical solution related to the change in the impression size with dwelling time at an indentation load is solved by using a well-known problem of infinite creeping media embedding spherical cavity subjected to an inner pressure which characterizes an indentation load. The applicability of the formula to elastic–plastic-creeping model resembling an actual response is checked by conducting a nonlinear finite-element analysis combined with contact option. Finally, creep indentation tests are conducted for a high-Cr ferritic heat-resisting steel, grade 122. It is shown that the creep parameters at a lower stress level can be estimated at temperature 873 K.

Determining Representative Stress and Representative Strain in Deriving Indentation Flow Curves Based on Finite Element Analysis

2005 ◽  
Vol 297-300 ◽  
pp. 2152-2157 ◽  
Author(s):  
Eun Chae Jeon ◽  
Min Kyung Baik ◽  
Sung Hoon Kim ◽  
Baik Woo Lee ◽  
Dong Il Kwon
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Indentation Test ◽  
Plastic Property ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Flow Curves ◽  
Element Analysis ◽  
Representative Strain ◽  
Instrumented Indentation Test

A new method [1] to evaluate indentation flow curves using an instrumented indentation test has been applied to many materials for several years. Though the method produces relatively good results compared to uniaxial tensile tests, a few parameters had not been verified by theoretical or numerical methods. In this study, proportional constants of representative strain and representative stress were verified using finite element analysis and proven to be unaffected by the elastic property and strain level. The constants were generally dependent on the plastic property; however, one combination of the constants is independent of all properties. The values of this combination are consistent with early research and produced overlapping indentation flow curves with uniaxial curves.

scholarly journals Study of Elastic Behavior of Metallic Thin Films by 2D Synchrotron XRD and in situ Tensile Testing

2007 ◽  
Vol 1027 ◽  
Author(s):  
Geandier Guillaume ◽  
Renault Pierre-Olivier ◽  
Goudeau Philippe ◽  
Eric Le Bourhis ◽  
Girault Baptiste
Keyword(s):  
Thin Films ◽  
Mechanical Response ◽  
Tensile Tests ◽  
Elastic Behavior ◽  
Metallic Thin Films ◽  
X Ray Diffraction ◽  
Synchrotron Source ◽  
X Ray ◽  
Transmission Geometry

AbstractUnderstanding the mechanical behaviour of nano-structured thin films in relation to their structure, in particular to the grain size, is of high importance for the development of technological applications. Model nanometric multilayer W/Au systems exhibiting different structures are elaborated. These films are supported by a (thin) polyimide substrate. Films mechanical response is characterized experimentally by tensile tests carried out in-situ in a X-ray diffractometer installed on a synchrotron source. X-ray diffraction in transmission geometry has been used to study the deformations of both phases as a function of applied load. This geometry has been developed in the aim of optimizing the experiment time.

scholarly journals Analysis of Impact Energy to Fracture Unnotched Charpy Specimens Made From Railroad Tank Car Steel

2007 ◽  
Author(s):  
H. Yu ◽  
D. Y. Jeong ◽  
J. E. Gordon ◽  
Y. H. Tang
Keyword(s):  
Test Data ◽  
Impact Energy ◽  
Stress Triaxiality ◽  
Fracture Initiation ◽  
Equivalent Strain ◽  
Strain Criterion ◽  
Element Analysis ◽  
Damage And Failure ◽  
Failure Modeling ◽  
The Impact

This paper describes a nonlinear finite element analysis (FEA) framework that examines the impact energy to fracture unnotched Charpy specimens by an oversized, nonstandard pendulum impactor called the Bulk Fracture Charpy Machine (BFCM). The specimens are made from railroad tank car steel, have different thicknesses and interact with impact tups with different sharpness. The FEA employs a Ramberg-Osgood equation for plastic deformations. Progressive damage and failure modeling is applied to predict initiation and evolution of fracture and ultimate material failure. Two types of fracture initiation criterion, i.e., the constant equivalent strain criterion and the stress triaxiality dependent equivalent strain criterion, are compared in material modeling. The impact energy needed to fracture a BFCM specimen is calculated from the FEA. Comparisons with the test data show that the FEA results obtained using the stress triaxiality dependent fracture criterion are in excellent agreement with the BFCM test data.

Determination of the mechanical properties of metallic thin films and substrates from indentation tests

2002 ◽  
Vol 82 (10) ◽  
pp. 2013-2029 ◽  
Author(s):  
K. Tunvisut ◽  
E. P. Busso ◽  
N. P. O'dowd ◽  
H. P. Brantner
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Metallic Thin Films ◽  
Indentation Tests

Determination of Creep Constitutive Law of Solder Materials Using Indentation Creep Test

2005 ◽  
Author(s):  
Shinsuke Sakai ◽  
Yu Watanabe ◽  
Satoshi Izumi ◽  
Atsushi Iwasaki ◽  
Takeshi Ogawa
Keyword(s):  
Creep Test ◽  
High Stress ◽  
Indentation Test ◽  
Turbine Rotor ◽  
Constitutive Law ◽  
Indentation Creep ◽  
Element Analysis ◽  
Stress Region ◽  
Indentation Tests

Authors reported in the previous paper [1] that indentation creep test is effective to evaluate the creep power law from small specimen. We derived the formulation and applied the proposed method to turbine rotor materials. Eventually, it was shown that the method is applicable for the evaluation of creep constitutive law especially under high stress region. Under the low stress region, however, the applicability of the method was not confirmed since it requires much time for the confirmation. As most necessary property for creep deformation is that for low stress region, the extension of the proposed method for the low stress region is considered extremely important. For this purpose, it is not appropriate to use steel materials for the confirmation because it consumes too much time to conduct creep indentation test under low stress. For solder materials, however, it is rather easier to conduct the creep indentation test under low stress because the creep phenomena occur even at room temperature. In this paper, we report the results of creep indentation test for solder materials and examine the applicability of the proposed method. Besides finite element analysis is performed to evaluate stress conversion factor which enables us to evaluate Norton’s law only from creep indentation tests.

Inverse Characterization of Nonlinear Anisotropic Mechanical Properties of Engineered Cardiovascular Tissues Using a Spherical Indentation Test

2007 ◽  
Author(s):  
M. A. J. Cox ◽  
R. A. Boerboom ◽  
C. V. C. Bouten ◽  
N. J. B. Driessen ◽  
F. P. T. Baaijens
Keyword(s):  
Mechanical Properties ◽  
Soft Tissues ◽  
Indentation Test ◽  
Tensile Tests ◽  
Material Behavior ◽  
Uniaxial Tensile ◽  
Spherical Indentation ◽  
Mechanical Conditioning ◽  
Indentation Tests

Over the last few years, research interest in tissue engineering as an alternative for e.g. current treatment and replacement strategies for cardiovascular and heart valve diseaes has significantly increased. In vitro mechanical conditioning is an essential tool for engineering strong implantable tissues [1]. Detailed knowledge of the mechanical properties of the native tissue as well as the properties of the developing engineered constructs is vital for a better understanding and control of the mechanical conditioning process. The typical highly nonlinear and anisotropic behavior of soft tissues puts high demands on their mechanical characterization. Current standards in mechanical testing of soft tissues include (multiaxial) tensile testing and indentation tests. Uniaxial tensile tests do not provide sufficient information for characterizing the full anisotropic material behavior, while biaxial tensile tests are difficult to perform, and boundary effects limit the test region to a small central portion of the tissue. In addition, characterization of the local tissue properties from a tensile test is non-trivial. Indentation tests may be used to overcome some of these limitations. Indentation tests are easy to perform and when indenter size is small relative to the tissue dimensions, local characterization is possible. Therefore, we propose a spherical indentation test using finite deformations.

Rocking Beam Microarea Diffraction Applied to Metallic thin Films

1976 ◽  
Vol 34 ◽  
pp. 396-397
Author(s):  
R. H. Geiss
Keyword(s):  
Thin Films ◽  
Electron Diffraction ◽  
Small Area ◽  
Objective Lens ◽  
Electron Optics ◽  
Metallic Thin Films ◽  
Transmission Electron Diffraction ◽  
Transmission Electron ◽  
Sample Height ◽  
Scanning Transmission

The theory and practical limitations of micro area scanning transmission electron diffraction (MASTED) will be presented. It has been demonstrated that MASTED patterns of metallic thin films from areas as small as 30 Åin diameter may be obtained with the standard STEM unit available for the Philips 301 TEM. The key to the successful application of MASTED to very small area diffraction is the proper use of the electron optics of the STEM unit. First the objective lens current must be adjusted such that the image of the C2 aperture is quasi-stationary under the action of the rocking beam (obtained with 40-80-160 SEM settings of the P301). Second, the sample must be elevated to coincide with the C2 aperture image and its image also be quasi-stationary. This sample height adjustment must be entirely mechanical after the objective lens current has been fixed in the first step.

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