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Daniel Krajcarz - One of the best experts on this subject based on the ideXlab platform.

  • influence of Material structure on forces measured during abrasive waterjet awj machining
    Materials, 2020
    Co-Authors: Libor M Hlavac, Adam Stefek, Daniel Krajcarz
    Abstract:

    Material structure is one of the important factors influencing abrasive waterjet (AWJ) machining efficiency and quality. The force measurements were performed on samples prepared from two very similar steels with different thicknesses and heat treatment. The samples were austenitized at 850 °C, quenched in polymer and tempered at various temperatures between 20 °C and 640 °C. The resulting states of Material substantially differed in strength and hardness. Therefore, samples prepared from these Material states are ideal for Testing of Material response to AWJ. The force measurements were chosen to test the possible influence of Material structure on the Material response to the AWJ impact. The results show that differences in Material structure and respective Material properties influence the limit traverse speed. The cutting to deformation force ratio seems to be a function of relative traverse speed independently on Material structure.

Libor M Hlavac - One of the best experts on this subject based on the ideXlab platform.

  • influence of Material structure on forces measured during abrasive waterjet awj machining
    Materials, 2020
    Co-Authors: Libor M Hlavac, Adam Stefek, Daniel Krajcarz
    Abstract:

    Material structure is one of the important factors influencing abrasive waterjet (AWJ) machining efficiency and quality. The force measurements were performed on samples prepared from two very similar steels with different thicknesses and heat treatment. The samples were austenitized at 850 °C, quenched in polymer and tempered at various temperatures between 20 °C and 640 °C. The resulting states of Material substantially differed in strength and hardness. Therefore, samples prepared from these Material states are ideal for Testing of Material response to AWJ. The force measurements were chosen to test the possible influence of Material structure on the Material response to the AWJ impact. The results show that differences in Material structure and respective Material properties influence the limit traverse speed. The cutting to deformation force ratio seems to be a function of relative traverse speed independently on Material structure.

Adam Stefek - One of the best experts on this subject based on the ideXlab platform.

  • influence of Material structure on forces measured during abrasive waterjet awj machining
    Materials, 2020
    Co-Authors: Libor M Hlavac, Adam Stefek, Daniel Krajcarz
    Abstract:

    Material structure is one of the important factors influencing abrasive waterjet (AWJ) machining efficiency and quality. The force measurements were performed on samples prepared from two very similar steels with different thicknesses and heat treatment. The samples were austenitized at 850 °C, quenched in polymer and tempered at various temperatures between 20 °C and 640 °C. The resulting states of Material substantially differed in strength and hardness. Therefore, samples prepared from these Material states are ideal for Testing of Material response to AWJ. The force measurements were chosen to test the possible influence of Material structure on the Material response to the AWJ impact. The results show that differences in Material structure and respective Material properties influence the limit traverse speed. The cutting to deformation force ratio seems to be a function of relative traverse speed independently on Material structure.

Pezeshki Hadi - One of the best experts on this subject based on the ideXlab platform.

  • Numerical Simulation of Industrial Ultrasonic Testing of Material
    University of Stavanger Norway, 2020
    Co-Authors: Pezeshki Hadi
    Abstract:

    In this thesis, numerical simulation of ultrasonic Testing is developed by modeling three different Materials including Perspex, water, and steel in each model. Procedures of calibration of An angle probe including timebase calibration, probe index, and probe angle determinations are simulated by 4 different specimens. In addition, speed of sound in the three modeled media, probe near field length, time base linearity, and A-scan display were calculated and verified. The geometry of V1, V2 calibration blocks, and a manipulated V1 calibration block were simulated in the three different models. A model with no detectable back wall echo by the probe was also created to study the noise signals generated in the simulation. An MWB60-N4 type angle probe producing an angle beam in 60 degrees in 4 MHz central frequency along with water coupling were simulated in each model. In the Results section, the nodal displacements are illustrated in magnitude and local directions that shows wave propagation through the different assembled Materials. The simulation results show that the mode change has successfully happened in the probe-coupling and coupling-specimen interfaces. An initial P-wave at the probe medium transformed into an S-wave at the specimen medium. The average speed of sound in the probe and specimen media has been verified with the analytical values. The probe near-field length was obtained at approximately 29mm which is almost the same length as proposed by the probe manufacture. The probe index is the point where the probe centerline coincides with the coupling. The angle of the probe was measured at around 58 degrees that is comparable to the nominal value of 60 degrees proposed by manufacture. Besides, A-scan displays of the models were created by using the extracted data from the simulation. The time base linearity was also verified by comparing these A-scan. The A-scan display of the simulated V2 calibration block was also compared to that of the experimental test. The comparison shows that both A-scan displays of simulation and experimental Testing have a remarkable resemblance in a qualitative manner. However, the amplitude drop between the two back wall echo signals in the experimental test is significantly lower than that of the simulation

  • Numerical Simulation of Industrial Ultrasonic Testing of Material
    University of Stavanger Norway, 2020
    Co-Authors: Pezeshki Hadi
    Abstract:

    Master's thesis in Structural EngineeringIn this thesis, numerical simulation of ultrasonic Testing is developed by modeling three different Materials including Perspex, water, and steel in each model. Procedures of calibration of An angle probe including timebase calibration, probe index, and probe angle determinations are simulated by 4 different specimens. In addition, speed of sound in the three modeled media, probe near field length, time base linearity, and A-scan display were calculated and verified. The geometry of V1, V2 calibration blocks, and a manipulated V1 calibration block were simulated in the three different models. A model with no detectable back wall echo by the probe was also created to study the noise signals generated in the simulation. An MWB60-N4 type angle probe producing an angle beam in 60 degrees in 4 MHz central frequency along with water coupling were simulated in each model. In the Results section, the nodal displacements are illustrated in magnitude and local directions that shows wave propagation through the different assembled Materials. The simulation results show that the mode change has successfully happened in the probe-coupling and coupling-specimen interfaces. An initial P-wave at the probe medium transformed into an S-wave at the specimen medium. The average speed of sound in the probe and specimen media has been verified with the analytical values. The probe near-field length was obtained at approximately 29mm which is almost the same length as proposed by the probe manufacture. The probe index is the point where the probe centerline coincides with the coupling. The angle of the probe was measured at around 58 degrees that is comparable to the nominal value of 60 degrees proposed by manufacture. Besides, A-scan displays of the models were created by using the extracted data from the simulation. The time base linearity was also verified by comparing these A-scan. The A-scan display of the simulated V2 calibration block was also compared to that of the experimental test. The comparison shows that both A-scan displays of simulation and experimental Testing have a remarkable resemblance in a qualitative manner. However, the amplitude drop between the two back wall echo signals in the experimental test is significantly lower than that of the simulation

Krajcarz Daniel - One of the best experts on this subject based on the ideXlab platform.

  • Influence of Material structure on forces measured during abrasive waterjet (AWJ) machining
    'MDPI AG', 2020
    Co-Authors: Hlaváč, Libor M., Štefek Adam, Tyč Martin, Krajcarz Daniel
    Abstract:

    Material structure is one of the important factors influencing abrasive waterjet (AWJ) machining efficiency and quality. The force measurements were performed on samples prepared from two very similar steels with different thicknesses and heat treatment. The samples were austenitized at 850 degrees C, quenched in polymer and tempered at various temperatures between 20 degrees C and 640 degrees C. The resulting states of Material substantially differed in strength and hardness. Therefore, samples prepared from these Material states are ideal for Testing of Material response to AWJ. The force measurements were chosen to test the possible influence of Material structure on the Material response to the AWJ impact. The results show that differences in Material structure and respective Material properties influence the limit traverse speed. The cutting to deformation force ratio seems to be a function of relative traverse speed independently on Material structure.Web of Science1317art. no. 387