Development of Linear Servo Hydraulic Drive for Material Testing

Tič, Vito; Lovrec, Darko

doi:10.1007/978-3-030-46817-0_12

Cited by 1 publication

(2 citation statements)

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“…Conventional fatigue tests were conducted on a servo-hydraulic testing machine, in which frequency can be imposed from 0.5 to 20 Hz. The complete system of the machine was developed in the University of Maribor, Slovenia [23]; an overview is depicted in Figure 4. The manufacturing of The experimental start up for each specimen under ultrasonic fatigue tests was as follows: stabilization of the system for 30 s with an applied load of 44 MPa (corresponding to the lower voltage of ultrasonic generator: 10 volts); afterwards, increasing 4.4 MPa each second to attain the desired applied load.…”

Section: Experimental Set Upmentioning

confidence: 99%

“…Conventional fatigue tests were conducted on a servo-hydraulic testing machine, in which frequency can be imposed from 0.5 to 20 Hz. The complete system of the machine was developed in the University of Maribor, Slovenia [23]; an overview is depicted in Figure 4. The manufacturing of the parts and the whole controlling system for the machine was configurated to work between 0.5 to 20 Hz; all tests under conventional fatigue were obtained at the highest frequency and with load ratio R = 0.1, at room temperature without control of environmental humidity.…”

Section: Experimental Set Upmentioning

confidence: 99%

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Ultrasonic and Conventional Fatigue Endurance of Aeronautical Aluminum Alloy 7075-T6, with Artificial and Induced Pre-Corrosion

Tello

Milković

Almaraz

et al. 2020

Metals

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Ultrasonic and conventional fatigue tests were carried out on the AISI-SAE AA7075-T6 aluminum alloy, in order to evaluate the effect of artificial and induced pre-corrosion. Artificial pre-corrosion was obtained by two hemispherical pitting holes of 500-μm diameter at the specimen neck section, machined following the longitudinal or transverse direction of the testing specimen. Induced pre-corrosion was achieved using the international standard ESA ECSS-Q-ST-70-37C of the European Space Agency. Specimens were tested under ultrasonic fatigue technique at frequency of 20 kHz and under conventional fatigue at frequency of 20 Hz. The two applied load ratios were: R = −1 in ultrasonic fatigue tests and R = 0.1 in conventional fatigue tests. The main results were the effects of artificial and induced pre-corrosion on the fatigue endurance, together with the surface roughness modification after the conventional fatigue tests. Crack initiation and propagation were analyzed and numeric models were constructed to investigate the stress concentration associated with pre-corrosion pits, together with the evaluation of the stress intensity factor in mode I from crack initiation to fracture. Finally, the stress intensity factor range threshold ΔKTH was obtained for the base material and specimens with two hemispherical pits in transverse direction.

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Section: Experimental Set Upmentioning

confidence: 99%

“…Conventional fatigue tests were conducted on a servo-hydraulic testing machine, in which frequency can be imposed from 0.5 to 20 Hz. The complete system of the machine was developed in the University of Maribor, Slovenia [23]; an overview is depicted in Figure 4. The manufacturing of the parts and the whole controlling system for the machine was configurated to work between 0.5 to 20 Hz; all tests under conventional fatigue were obtained at the highest frequency and with load ratio R = 0.1, at room temperature without control of environmental humidity.…”

Section: Experimental Set Upmentioning

confidence: 99%