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Related Concept Videos

Bending of Material: Problem Solving01:09

Bending of Material: Problem Solving

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In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
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Stresses under Combined Loadings01:23

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When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
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Application of the Linear Momentum Equation01:15

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The application of the linear momentum equation can be used to analyze the forces needed to hold a 180-degree pipe bend in place with flowing water. In this case, water flows through the bend with a constant cross-sectional area of 0.01 square meters and a flow velocity of 15 meters per second. The pressure at the entrance is 0.2 Megapascals and the pressure at the exit is 0.16 Megapascals.
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Fatigue01:21

Fatigue

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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
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Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
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An Experimental Method for Fatigue Testing Cast Iron Water Pipes Using Combined Internal Water Pressure and Bending

E D A John1, J B Boxall1, R P Collins1

  • 1School of Mechanical, Aerospace and Civil Engineering, Sir Frederick Mappin Building, The University of Sheffield, Mappin Street, Sheffield, S1 4DT UK.

Experimental Mechanics
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Summary

A new lab experiment accurately simulates high-cycle biaxial fatigue in Grey Cast Iron (GCI) pipes. This method enables detailed study of fatigue failure mechanisms in GCI water pipes.

Keywords:
Biaxial fatigueConstant amplitudeExperiment verificationGrey cast ironWater pipe

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Civil Engineering

Background:

  • Investigating fatigue failure mechanisms in Grey Cast Iron (GCI) water pipes is challenging due to the absence of a suitable laboratory method for extensive high-cycle biaxial fatigue testing.
  • Existing research is limited by the lack of standardized experimental procedures for simulating real-world stress conditions on GCI pipes.

Purpose of the Study:

  • To develop and validate a novel experimental setup for controlled fatigue failure testing of GCI pipe specimens.
  • To enable extensive high-cycle biaxial fatigue testing of GCI pipes under combined loading conditions.

Main Methods:

  • A novel four-point bending and internal water pressure fatigue testing system was designed to apply constant amplitude, out-of-phase biaxial loading to 58 mm diameter GCI pipes at 1.7 Hz.
  • Finite element analysis (FEA) was employed to estimate strains and displacements, and experimental measurements were used to verify the accuracy and repeatability of the applied loads.
  • The system was tested to quantify dynamic load effects and assess the lifespan of fatigue cracks.

Main Results:

  • Experimental strains and displacements were within ±10% of FEA estimations, and pressure amplitudes remained within ±3% of the average over 10^3 cycles, demonstrating high accuracy and consistency.
  • Dynamic load effects at higher bending loads were identified, quantified, and accounted for in the analysis.
  • Trial tests indicated that the lifespan of leaking fatigue cracks in GCI pipes with uniform wall loss under combined loading is less than 1% of the total cycles to burst.

Conclusions:

  • The developed experimental method successfully applies combined, out-of-phase internal pressure and bending fatigue loads accurately and consistently to small-diameter GCI pipes.
  • This novel system effectively induces high-cycle fatigue failures in GCI pipes, paving the way for more comprehensive investigations into their fatigue behavior.
  • The findings provide a critical tool for understanding and predicting the service life of GCI water infrastructure.