Wyniki wyszukiwania - BazTech

1

Digital Material Representation Model of Porous Microstructure Based on 3D Reconstruction Algorithm

Madej Ł., Mojżeszko M., Chrapoński J., Roskosz S., Cwajna J.

Archives of Metallurgy and Materials

|

2017

|

Vol. 62, iss. 2A

563--569

EN

Development of the Digital Material Representation (DMR) model, based on 3D reconstruction algorithm and serial sectioning, is the main goal of the present paper. Details on the serial sectioning and image processing algorithms are presented first. Serial sectioning is realized on the basis of light microscopy (LM). Then concept of 3D reconstruction and developed algorithms are presented. Two approaches, based on shape coefficients and the flood fill algorithms, are developed to identify corresponding features on subsequent 2D images. Then, the interpolation algorithm to reconstruct 3D volume between 2D images is presented. Finally, obtained 3D model is an input for finite element mesh generation software for subsequent finite element calculations.

2

Development of Crack Detection Method with 2 Dimensionally Generated 3 Dimensionally Reconstructed Images in THT Solder Joints

Gergely G., Koncz-Horváth D., Weltsch Z., Gacsi Z.

Archives of Metallurgy and Materials

|

2017

|

Vol. 62, iss. 2B

1033--1038

EN

This work represents an interesting development in the detection and interpretation of crack evolution in through hole technology (THT) solder joints, which based on the development of general and common method. Serial sectioning is a useful method because it overcomes the problems associated with traditional two-dimensional metallographic techniques by providing information about (micro)structures in three-dimensions. In our work, serials sectioning with reconstruction method was utilized to visualize the 3D nature of cracks in through hole solder joint. Accurate quantitive analysis of the cracks, such as crack length, position and extension are presented with a help of the developed method: newly defined parameter and serial-cross sectioning method.

3

Evaluation of cracks profile under the Vickers indentation

Blažková K., Jonšta Z., Mazanec K.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

|

2007

|

Vol. 321, z. 89

85-86

EN

This work is devoted to the investigation of indentation crack profiles under Vickers indentation on two types cutting tool ceramics. First type of ceramics was aluminium oxide with zirconium oxide and the second one was silicon nitride ceramics. Vickers indents are created into the ceramic surface by hardness testing machine with a load of 294 N, loading time of indentations is 10 s. The value of investigated ceramics A12O3 + ZrO2 is equal to 1765 HV and Si3N4 ceramics reaches the average hardness value of 1574 HV. After Vickers indentation a system of initiated cracks and deformed area are initiated. The attention of this work is given up to the experimental technique by using serial sectioning to obtain depth profile of indentation cracks. By using this method it is possible to obtain a complete system of crack profiles under the Vickers indent and shape of deformed area. Serial sectioning methods are consisted of removing thin layers of material by ceramographic polishing. For each layer three polishing steps with diamond suspension 6,3 and 1 nm were performed. Two different processes of removing material method layer-by-layer are used. The first method consists in obtaining depth profile of the crack determined by ablating in steps from the surface into which the indentations was made. Diagonals of Vickers indents are measured before consecutive polishing and between every polishing step. In the case where the indents are already ablated there is no way how to determine the depth of polishing. To prevent to lose the depth reference new indents have to be created into the specimen surface before ablating previous ones, The second technique is based on layer removal from plane perpendicular to the indented surface. According the results the second method is more precise because of easier control of removed material, obtaining real profile of cracks system and deformed area under the Vickers indent.