TY  - GEN
AB  - Hydroelectric powerplants play a vital role in the electricity production mix, especially during the ongoing energy transition towards renewable sources. However, they face operational challenges due to harmful stress loading of various components. Ensuring safe operation remains essential for people's safety, electricity supply, and costs avoidance. The study focuses on penstocks and pipelines material damaging caused by fatigue, crack initiation and propagation. These critical components are often several decades old and expensive to refurbish or replace. Cycling loading, induced by pressure oscillations during start-stop or transient operations, accelerates material fatigue. Steel lining corrodes over time, and welds may contain original defects. To address this, a new testing facility that generates controlled cyclic pressure oscillations using the water hammer effect has been built. This specific closed-loop circuit allows accelerated fatigue testing of material probes, providing insights into crack initiation and propagation. The test rig operating principle is described while its 1D numerical model is introduced and validated with measurement data. The prediction of crack incipience and rupture of a tubular specimen with a pre-machined longitudinal weakening is in the end compared with the results of a fatigue test conducted on the test bench.
AD  - School of Engineering, HES-SO Valais-Wallis, HEI, HES-SO University of Applied Sciences and Arts Western Switzerland
AD  - School of Engineering, HES-SO Valais-Wallis, HEI, HES-SO University of Applied Sciences and Arts Western Switzerland
AD  - School of Engineering, HES-SO Valais-Wallis, HEI, HES-SO University of Applied Sciences and Arts Western Switzerland
AD  - School of Engineering, HES-SO Valais-Wallis, HEI, HES-SO University of Applied Sciences and Arts Western Switzerland
AD  - Power Vision Engineering Sàrl, St-Sulpice, Switzerland
AD  - School of Engineering, HES-SO Valais-Wallis, HEI, HES-SO University of Applied Sciences and Arts Western Switzerland
AD  - School of Engineering, HES-SO Valais-Wallis, HEI, HES-SO University of Applied Sciences and Arts Western Switzerland
AU  - Hasmatuchi, Vlad
AU  - Rittiner, Robin
AU  - Boyer-Pires, Salomé
AU  - Lecointre, Charly-Loup
AU  - Nicolet, Christophe
AU  - Münch-Alligné, Cécile
AU  - Rey-Mermet, Samuel
CY  - Bristol, UK
DA  - 2024-09
DO  - 10.1088/1755-1315/1411/1/012039
DO  - DOI
EP  - 012039
ID  - 15338
JF  - IOP Conference Series: Earth and Environmental Science ; Proceedings of the 32nd IAHR Symposium on Hydraulic Machinery and Systems, 11-14 September 2024, Roorkee, India
L1  - https://arodes.hes-so.ch/record/15338/files/Hasmatuchi_2024_experimental_facility_dedicated_detection_prediction_penstock_fatigue_induced_pressure_oscillations.pdf
L2  - https://arodes.hes-so.ch/record/15338/files/Hasmatuchi_2024_experimental_facility_dedicated_detection_prediction_penstock_fatigue_induced_pressure_oscillations.pdf
L4  - https://arodes.hes-so.ch/record/15338/files/Hasmatuchi_2024_experimental_facility_dedicated_detection_prediction_penstock_fatigue_induced_pressure_oscillations.pdf
LA  - eng
LK  - https://arodes.hes-so.ch/record/15338/files/Hasmatuchi_2024_experimental_facility_dedicated_detection_prediction_penstock_fatigue_induced_pressure_oscillations.pdf
N2  - Hydroelectric powerplants play a vital role in the electricity production mix, especially during the ongoing energy transition towards renewable sources. However, they face operational challenges due to harmful stress loading of various components. Ensuring safe operation remains essential for people's safety, electricity supply, and costs avoidance. The study focuses on penstocks and pipelines material damaging caused by fatigue, crack initiation and propagation. These critical components are often several decades old and expensive to refurbish or replace. Cycling loading, induced by pressure oscillations during start-stop or transient operations, accelerates material fatigue. Steel lining corrodes over time, and welds may contain original defects. To address this, a new testing facility that generates controlled cyclic pressure oscillations using the water hammer effect has been built. This specific closed-loop circuit allows accelerated fatigue testing of material probes, providing insights into crack initiation and propagation. The test rig operating principle is described while its 1D numerical model is introduced and validated with measurement data. The prediction of crack incipience and rupture of a tubular specimen with a pre-machined longitudinal weakening is in the end compared with the results of a fatigue test conducted on the test bench.
PB  - IOP Publishing
PP  - Bristol, UK
PY  - 2024-09
SN  - 1755-1307
SP  - 012039
T1  - Experimental facility dedicated to detection and prediction of penstock fatigue induced by pressure oscillations
TI  - Experimental facility dedicated to detection and prediction of penstock fatigue induced by pressure oscillations
UR  - https://arodes.hes-so.ch/record/15338/files/Hasmatuchi_2024_experimental_facility_dedicated_detection_prediction_penstock_fatigue_induced_pressure_oscillations.pdf
VL  - 2024, 1411
Y1  - 2024-09
ER  -