scholarly journals Determination of the Mechanical Properties of the Coated Layer in the Sheet Metal Using Load-Displacement Curve by Nanoindentation Technique

2004 ◽  
Vol 13 (8) ◽  
pp. 731-737
Keyword(s):  
Mechanical Properties ◽  
Sheet Metal ◽  
Displacement Curve ◽  
Nanoindentation Technique ◽  
Coated Layer ◽  
Load Displacement

Effect of Lubrication on the Erichsen Test

2013 ◽  
Vol 365-366 ◽  
pp. 425-428 ◽  
Author(s):  
Gillo Giuliano ◽  
F. Samani
Keyword(s):  
Sheet Metal ◽  
Lateral Surface ◽  
Aluminium Alloys ◽  
Mg Alloy ◽  
Displacement Curve ◽  
Cu Alloy ◽  
Load Displacement ◽  
Erichsen Test

This study analyzes experimentally the influence of the friction between the sheet metal and the die surfaces on the results of the Erichsen test in terms of load-displacement curve of the punch, the normalized thickness measured at the specimen apex and the distance measured between the thinnest area of the specimen and the lateral surface of the blankholder. Two types of aluminium alloys, AA 2017 Al-Cu alloy (Al-4.5%Cu-1.0%Mn-1.0%Mg) and AA 5083 Al-Mg alloy (Al-4.5%Mg-1.0%Mn-0.15%Cr), with thickness of 1.0 mm are selected as the experimental materials for Erichsen test.

The Deformation Mechanism at Pop-In: Monocrystalline Silicon under Nanoindentation with a Berkovich Indenter

2008 ◽  
Vol 389-390 ◽  
pp. 453-458 ◽  
Author(s):  
Li Chang ◽  
Liang Chi Zhang
Keyword(s):  
Mechanical Properties ◽  
Phase Transition ◽  
Loading Rate ◽  
Monocrystalline Silicon ◽  
Displacement Curve ◽  
Berkovich Indenter ◽  
Rapid Loading ◽  
Slope Change ◽  
Indentation Tests ◽  
Load Displacement

This paper investigates the “pop-in” behavior of monocrystalline silicon under nanoindentation with a Berkovich indenter. The indentation tests were carried out under ultra-low loads, i.e. 100 μN and 300 μN, with different loading/unloading rates. It was found that with the experimentally determined area function of the indenter tip, the mechanical properties of silicon can be accurately calculated from the load-displacement data, that a pop-in event represents the onset of phase transition, and that a lower loading rate favours a sudden volume change but a rapid loading process tends to generate a gradual slope change of the load-displacement curve.

scholarly journals Analysis on the Mechanical Performance of the Joints of the Wheel-coupler type formwork Support

2021 ◽  
Vol 261 ◽  
pp. 02070
Author(s):  
Shilong Jia ◽  
Fang Zhou ◽  
Zhongliang Chen
Keyword(s):  
Mechanical Properties ◽  
Bearing Capacity ◽  
Mechanical Performance ◽  
Ultimate Bearing Capacity ◽  
Displacement Curve ◽  
Ansys Software ◽  
Rotational Stiffness ◽  
Non Linear ◽  
Tension And Compression ◽  
Load Displacement

In order to study the mechanical properties of the joints, ANSYS software was used to simulate and analyse the failure form, ultimate bearing capacity, load-displacement curve and the rotational stiffness of the wheel-coupler joint node under force. Results: The wheel-coupler joint node has obvious non-linear characteristics when subjected to force; The bilateral symmetric tension and compression state could better reflect the failure form and deformation of the joint; The rotational stiffness of the wheel-coupler joint node under tension and bending was greater than that under bending and torsion, and was greater than that under tension, bending and torsion.

Characterization of mechanical properties of tungsten carbide/carbon multilayers: Cross-sectional electron microscopy and nanoindentation observations

2001 ◽  
Vol 16 (8) ◽  
pp. 2213-2222 ◽  
Author(s):  
N. J. M. Carvalho ◽  
J. Th. M. De Hosson
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Tungsten Carbide ◽  
Physical Vapor Deposition ◽  
Hysteresis Loops ◽  
Displacement Curve ◽  
Depth Sensing ◽  
Cross Sectional ◽  
Load Displacement ◽  
A New Technique

Multilayers of tungsten carbide/carbon (WC/C) deposited by physical vapor deposition onto steel substrates were subjected to depth-sensing indentation testing. The investigation aimed at probing the influence of dissimilarities between the microstructure of the multilayers and substrate on the system mechanical properties. The resultant load-displacement data were analyzed both by conventional load-displacement (P-δ) and load-displacement squared (P-δ2) plots. Furthermore, it was demonstrated that the occurrence of annular through-thickness cracks around the indentation sites can be identified from the load-displacement curve. Also, analysis of the lower part of the unloading curve permitted us to identify whether the coating had popped up by localized fracture. The cracking mechanism was characterized using a new technique for cross-sectional electron microscopy of the nanoindentations. The information retrieved with this technique eliminates the problems, inherent in assessing at this small contact scales, whether the fracture is by coating decohesion or by interfacial failure. In our case, it was demonstrated that the failure mechanism was decohesion of the carbon lamellae within the multilayers. The mechanical properties (hardness and effective Young's modulus) were also assessed by nanoindentation. The hysteresis loops were analyzed and discussed in terms of the method developed by Oliver and Pharr [J. Mater. Res. 7, 1564 (1992)].

Determination of localized stress–strain behavior of fused silica: Inverse numerical analysis from nanoindentation test

2020 ◽  
pp. 146442072096703
Author(s):  
Suparat Bootchai ◽  
Nitikorn Noraphaiphipaksa ◽  
Nipon Taweejun ◽  
Anchalee Manonukul ◽  
Chaosuan Kanchanomai
Keyword(s):  
Mechanical Properties ◽  
Numerical Analysis ◽  
Three Dimensional ◽  
Fused Silica ◽  
Nanoindentation Test ◽  
Displacement Curve ◽  
Stress Strain ◽  
Element Analysis ◽  
Strain Behavior ◽  
Load Displacement

Because the localized mechanical properties of fused silica are unlikely to be obtained via conventional tensile testing, an inverse numerical analysis has been applied to deduce these properties using the load–displacement curve from nanoindentation testing. The mechanical properties were initially assumed, and the load–displacement curve was numerically simulated using three-dimensional elastic–plastic finite element analysis. The mechanical properties were adjusted until the numerical curve corresponded to the experimental curve, and then the localized mechanical properties in the vicinity of an indentation could be estimated. Unfortunately, the inverse numerical analysis requires time-consuming numerical calculation, involving many repetitions, by experienced researchers. In the present work, the influence of mechanical properties on the nanoindentation parameters of fused silica was evaluated, and the systematical adjustment of mechanical properties to obtain a satisfactory load–displacement curve has been proposed. It is considered that this procedure can be applied for the evaluation of localized stress–strain behavior of fused silica.

scholarly journals Study on Mechanical Properties of Carburized Layer Based on Nano-Indentation

2021 ◽  
Vol 31 (3) ◽  
pp. 131-137
Author(s):  
Zhenduo Sun ◽  
Shifeng Wang ◽  
Dongbo Hou
Keyword(s):  
Mechanical Properties ◽  
Pure Iron ◽  
Indentation Test ◽  
Experimental Result ◽  
Displacement Curve ◽  
Mechanical Parameters ◽  
Nano Indentation ◽  
Dimension Analysis ◽  
Carburized Layer ◽  
Load Displacement

The work aims to obtain the local mechanical parameters of carburized layer of CiNi steel. Tensile test and nano-indentation test were carried out for CrNi steel, stress-strain curve and load-displacement curve were then obtained. The finite element model of nano-indentation was built, and a model for obtaining the local mechanical parameters of carburized layer from load-displacement curve was established combined with dimension analysis. The mechanical parameters of pure iron and carburized layer of CrNi steel were calculated. The results show that, the dimension analysis model is accurate for predicting the mechanical properties of pure iron, the model accuracy is verified. The local mechanical parameters of carburized layer are predicted by the model, the simulated load-replacement curve based on the predicted mechanical parameters is in good agreement with the experimental result, it shows that the prediction result of the model is reasonable.

Determination of Stress-Strain Curve through Berkovich Indentation Testing

2010 ◽  
Vol 636-637 ◽  
pp. 1186-1193 ◽  
Author(s):  
A.M.S. Dias ◽  
G.C.D. Godoy
Keyword(s):  
Mechanical Properties ◽  
Strain Curve ◽  
Young Modulus ◽  
Displacement Curve ◽  
Indentation Testing ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Research Areas ◽  
Versus Strain

Instrumented indentation testing is a technique widely used in different materials to evaluate the penetration depth in function of the indenter load. Considering Berkovich indenter, this methodology has been used to determine mechanical properties such as hardness, Young modulus and a stress versus strain curve of the elastic-plastic behaviour under compression of the tested materials. However, the implementation of this technique to evaluate mechanical properties and also its results have still brought doubts on research areas. Nowadays, the use of a numerical methodology able to evaluate the stress and strain fields during indentation cycle can lead to a more secure interpretation. The aim of this work was to simulate the Berkovich indentation testing and to propose a methodology to extract the stress-strain curve through experimental and numerical analyses. The obtained numerical results for the load-displacement curve were quite similar to the experimental curve presented in the literature.

Determination of Fracture Toughness From Small Punch Test Using Inverse Finite Element Method for In-Service Equipment

2017 ◽  
Author(s):  
Kaishu Guan ◽  
Tong Xu ◽  
Linling Guo ◽  
Mingxue Fu ◽  
Huadong Zhu
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Fracture Toughness ◽  
Finite Element ◽  
Displacement Curve ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Inverse Finite Element Method ◽  
Load Displacement

Fracture toughness is the most important reference index in safety assessment, life prediction of nuclear reactor, pressure equipment, and risk assessment of pressure equipment containing defects. Conventional mechanical test specimens require a large amount of materials and cannot be carried out on in-service pressure equipment. The specimen of small punch test (SPT) is much smaller than conventional one, and can be sampled from the surface of pressure equipment. Repair is not acquired after sampling. Many mechanical properties parameters of the material can be determined from the load-displacement curve of test. SPT makes up the deficiencies of conventional mechanical properties test. In this paper, an innovative approach, inverse finite element method (IFEM), is proposed to deal with the load-displacement curve. The procedure of IFEM can be divided into 3 steps. Step 1, a database containing a variety set of material parameters and their corresponding load-displacement curve will be built using FEM. Step 2; a set of matched material parameter of test load-displacement curve will be selected from the database by artificial neutral network (ANN). Step 3, a numerical simulation of fracture toughness test will be performed and fracture toughness Jic will be determined from the result of simulation. Compared with empirical correlation method, IFEM is much more theoretical and needs not to perform a large number of small punch tests and conventional mechanical tests to create a correlation equation between the mechanical property and load-displacement curve. So IFEM is more efficiency and accurate.

scholarly journals New approach of eggshell mechanical properties determinantion

2010 ◽  
Vol 58 (1) ◽  
pp. 161-166 ◽  
Author(s):  
Libor Severa ◽  
Jaroslav Buchar ◽  
Jiří Votava
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
New Approach ◽  
Load Displacement ◽  
Deformation Modes ◽  
Eggshell Structure ◽  
Tangential Directions

The paper describes a new approach for determination of mechanical properties of hen’s eggshell. The suitability and applicability of a Berkovich indentation is discussed. The eggshells were tested in the area surrounding equator line. The deformation modes active during indentation have been examinined from the shape of load-displacement curves. According to measured dependencies, the eggshel shown an viscous-elastic deformation.The values of Young’s modulus E obtained from radial and tangential directions did not vary significantly. This fact shows on isotropic nature of eggshell structure. It was found that values of E do not significantly change neither around the cir­cum­fe­ren­ce of the equator. The values obtained within this research correspond to values reported in literature and obtained on macroscopic samples. Nanoindentation was found to be a precise and powerful tool, suitable for determining local variations of mechanical properties of eggshells.

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