Effect of Strain History of Steel Sheets on the Mechanical Characteristics of Individual Microstructural Components by Depth Sensing Indentation

2016 ◽  
Vol 368 ◽  
pp. 45-48
Author(s):  
Peter Burik ◽  
Ladislav Pešek ◽  
Zuzana Andršová ◽  
Pavel Kejzlar ◽  
Pavol Zubko
Keyword(s):  
Mechanical Properties ◽  
Strain History ◽  
Depth Sensing ◽  
Multiphase Materials ◽  
Steel Sheets ◽  
History Of ◽  
Local Properties ◽  
Straightforward Solution ◽  
Characterization Of Materials

The macroscopic mechanical properties of steel are highly dependent upon microstructure, crystallographic orientation of grains and distribution of each phase present, etc. Nanomechanical testing using depth sensing indentation (DSI) provides a straightforward solution for quantitatively characterizing each of phases in microstructure because it is very powerful technique for characterization of materials in small volumes. Measuring the local properties of each microstructure component separately in multiphase materials gives information that is valuable for the development of new materials and for modelling. The work experimentally analyses the effect of strain history on the mechanical properties of individual components in steel sheets by depth sensing indentation. The measurements were carried out on broken tensile specimens.

Analysis of Mechanical Properties of Individual Phases in Steels by Depth Sensing Indentation

2014 ◽  
Vol 635 ◽  
pp. 216-220
Author(s):  
Peter Burik ◽  
Ladislav Pešek
Keyword(s):  
Mechanical Properties ◽  
New Materials ◽  
Intrinsic Properties ◽  
Depth Sensing ◽  
Multiphase Materials ◽  
Steel Sheets ◽  
Microstructure Morphology ◽  
Straightforward Solution ◽  
Characterization Of Materials

The macroscopic mechanical properties of steel are highly dependent upon microstructure, morphology, and distribution of each phase present. Nanomechanical testing (Depth sensing indentation) provides a straightforward solution for quantitatively characterizing each of these phases because it is very powerful technique for characterization of materials in small volumes. Measuring the intrinsic properties of each phase separately in multiphase materials gives information that is valuable for the development of new materials and for modelling [1]. In this work, depth sensing indentation has been used to reveal mechanical properties of different phases in steel sheets.

Effect of Different Factors on Measured Values of Indentation Hardness of Interstitial Free Steel by Depth Sensing Indentation

2018 ◽  
Vol 784 ◽  
pp. 49-54
Author(s):  
Peter Burik ◽  
Ladislav Pešek ◽  
Zuzana Andršová ◽  
Pavel Kejzlar
Keyword(s):  
Mechanical Properties ◽  
Sample Surface ◽  
Indentation Hardness ◽  
Indentation Modulus ◽  
Interstitial Free ◽  
Depth Sensing ◽  
Multiphase Materials ◽  
Material Characteristics ◽  
Straightforward Solution ◽  
Characterization Of Materials

Nanomechanical testing using depth sensing indentation (DSI) provides a straightforward solution for quantitatively characterizing each of phases in microstructure because it is very powerful technique for characterization of materials in small volumes. Measuring the local properties (indentation hardness HIT, indentation modulus EIT, indentation energy: total Wtotal, elastic Welast, plastic Wplast) of each microstructure component separately in multiphase materials gives information that is valuable for the development of new materials and for modelling. The mechanical properties of materials measured by DSI are affected by the experimental procedure, by the measurement conditions and factors which result from the material characteristics and device construction. We have to determine the effect of individual factors on the measurement in order to reach the repeatability and to allow the comparing the mechanical properties of the material. The aim of this investigation is to determine the measurement factors that affect indentation hardness of individual microstructural components and global mechanical properties of thin steel sheets. We investigated the factors which result from the material characteristics (crystallographic orientation of grain, grain boundary and anisotropy), preparation of the sample surface (roughness of sample surface) and method of measurement (pile-up, ISE).

Effect of Grid Indentation Parameters on the Mechanical Characteristics of Steel Sheets by Depth Sensing Indentation

2017 ◽  
Vol 891 ◽  
pp. 73-77
Author(s):  
Peter Burik ◽  
Ladislav Pešek ◽  
Zuzana Andršová ◽  
Pavel Kejzlar
Keyword(s):  
Mechanical Properties ◽  
Bulk Material ◽  
Heterogeneous Material ◽  
Indentation Hardness ◽  
Depth Sensing ◽  
Multiphase Materials ◽  
Steel Sheets ◽  
Mapping Tool ◽  
Straightforward Solution ◽  
Multiphase Steel

Nanomechanical testing using depth sensing indentation (DSI) provides a straightforward solution for characterizing of mechanical properties (indentation hardness HIT, Young’s modulus EIT, indentation energy: total Wtotal, elastic Welast, plastic Wplast) of homogeneous (bulk) materials. However, real materials such as multi-phase steels are a heterogeneous material on the microscopic scale (microstructure). We need to know the local mechanical properties of each phase separately in those materials for reasons development of new materials and for modeling. Mechanical properties of each phase separately in multiphase materials are difficult or even impossible to examine in bulk material ex situ.In this paper we describe the technique for measuring the mechanical properties of each phase separately in multiphase steel by two-dimensional mapping tool. This approach relies on large arrays of nanoindentations (known as grid indentation) and statistical analysis of the resulting data [1, 2]. The aim of this investigation is to optimize the parameters of the grid indentation for a given microstructure of steel sheets.

Local Mechanical Properties of Zinc-Iron Coated Steel Sheets by Depth-Sensing Indentation

2018 ◽  
Vol 784 ◽  
pp. 153-158
Author(s):  
Ľubomír Ambriško ◽  
Ladislav Pešek
Keyword(s):  
Mechanical Properties ◽  
Iron Concentration ◽  
Intermetallic Phases ◽  
Coated Steel ◽  
If Steel ◽  
Depth Sensing ◽  
Steel Sheets ◽  
Coating Surface ◽  
Annealing Conditions ◽  
Coating Composition

Depth-sensing indentation (DSI) is used in this work to determine the change of local mechanical properties by annealing of hot-dip galvanized IF steel sheets. The influence of annealing conditions (temperature and time) on: (i) coating composition; (ii) local mechanical properties and (iii) roughness of the coating surface was quantified. Annealing of steel samples (Ti-IF steel and Ti-Nb-P-IF steel alloyed with phosphorus) was performed with different holding times (10, 60, and 300 s) by both temperatures 450 and 550 °C. The zinc in coating transformed during annealing to the intermetallic phases ZnxFey. Annealed Zn-Fe coatings, wherein the iron concentration falls towards the surface, consist of different intermetallic phases.

scholarly journals Effects of Flotage on Immersion Indentation Results of Bone Tissue: An Investigation by Finite Element Analysis

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Mingxing Zhou ◽  
Zunqiang Fan ◽  
Zhichao Ma ◽  
Yue Guo ◽  
Liguo Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Nanoindentation Test ◽  
Liquid Media ◽  
Depth Sensing ◽  
Element Analysis ◽  
Fea Simulation ◽  
The Difference

In reality, nanoindentation test is an efficient technique for probing the mechanical properties of biological tissue that soaked in the liquid media to keep the bioactivity. However, the effects of flotage imposed on the indenter will lead to inaccuracy when calculating mechanical properties (for instance, elastic modulus and hardness) by using depth-sensing nanoindentation. In this paper, the effects of flotage on the nanoindentation results of cortical bone were investigated by finite element analysis (FEA) simulation. Comparisons of nanoindentation simulation results of bone samples with and without being soaked in the liquid media were carried out. Conclusions show that the difference of load-displacement curves in the case of soaking sample and without soaking sample conditions varies widely based on the change of indentation depth. In other words, the nanoindentation measurements in liquid media will cause significant error in the calculated Young’s modules and hardness due to the flotage. By taking into account the effect of flotage, these errors are particularly important to the accurate biomechanics characterization of biological samples.

scholarly journals MERGING GEOMETRIC DOCUMENTATION WITH MATERIALS CHARACTERIZATION AND ANALYSIS OF THE HISTORY OF THE HOLY AEDICULE IN THE CHURCH OF THE HOLY SEPULCHRE IN JERUSALEM

2017 ◽  
Vol XLII-5/W1 ◽  
pp. 487-494 ◽  
Author(s):  
A. Georgopoulos ◽  
E. Lambrou ◽  
G. Pantazis ◽  
P. Agrafiotis ◽  
A. Papadaki ◽  
...  
Keyword(s):  
Building Materials ◽  
Structural Integrity ◽  
Interdisciplinary Approach ◽  
Integrated Approach ◽  
History Of ◽  
Diagnostic Research ◽  
Characterization Of Materials ◽  
Non Destructive ◽  
The Church

The National Technical University of Athens undertook the compilation of an "Integrated Diagnostic Research Project and Strategic Planning for Materials, Interventions Conservation and Rehabilitation of the Holy Aedicule of the Church of the Holy Sepulchre in Jerusalem". This paper focuses on the work merging the geometric documentation with the characterization of materials, the identification of building phases and the diagnosis of decay and pathology through the use of analytical and non-destructive techniques. Through this integrated approach, i.e. through the documentation and characterization of the building materials, through the diagnosis of decay and pathology, through the accurate geometric documentation of the building and through the non-destructive prospection of its internal structure, it was feasible to identify the construction phases of the Holy Aedicule, identifying the remnants of the preserved earlier constructions and the original monolithic Tomb. This work, thus, demonstrates that the adoption of an interdisciplinary approach for integrated documentation is a powerful tool for a better understanding of monuments, both in terms of its structural integrity, as well as in terms of its state of preservation, both prerequisites for effective rehabilitation.

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