An Experimental Method for Fatigue Testing Cast Iron Water Pipes Using Combined Internal Water Pressure and Bending Loads.

• Tác giả: E T Bowman, J B Boxall, R P Collins, E D A John, L Susmel
• Ngôn ngữ: eng
• Ký hiệu phân loại: 001.43 Historical, descriptive, experimental methods
• Thông tin xuất bản: United States : Experimental mechanics , 2025
• Bộ sưu tập: NCBI
• ID: 746868

Tóm tắt

BACKGROUND: Investigations into the fatigue failures mechanism of Grey Cast Iron (GCI) water pipes are inhibited by the lack of a lab-based method to conduct extensive high-cycle biaxial fatigue test programmes. OBJECTIVE: The work presented in this paper developed and tested a novel experiment capable of causing controlled fatigue failures of GCI pipe specimens in the high-cycle fatigue regime using bending and internal water pressure fatigue loading. METHODS: A novel four-point bending and internal water pressure fatigue testing system was developed to apply constant amplitude out-of-phase biaxial loading to 58 mm diameter GCI pipes at 1.7 Hz. To verify the ability of this equipment to apply known stresses and repeatable loads to pipe specimens a series of tests were conducted. A finite element model of the pipe specimen was used to estimate the strains and displacements applied by the equipment. RESULTS: Experimental strains and displacements were mainly within ± 10% of the estimated values and the pressure amplitudes measured over 10 CONCLUSIONS: The experimental method developed was able to apply combined, out-of-phase internal pressure and bending fatigue loads accurately and consistently to small-dimeter GCI pipes, and cause these pipes to develop high-cycle fatigue regime failures.