Experimental Study of the Influence of a Redundant Hole with the Same Cross-Section and Different Diameters on the Response of Round-Hole Tubes under Cyclic Bending

Abstract

This experiment mainly investigates the response and failure of 6061-T6 aluminum round-hole tubes with a 90 degree redundant hole at the same cross-section and different diameters under cyclic bending In this experiment the degree of the round hole of the round-hole 6061-T6 aluminum round-hole tube is at 0 degree and 6 mm in diameter Five different diameters of the redundant hole are 2 4 6 8 and 10 mm The mechanical response is the moment-curvature and ovalization-curvature relationships The failure is the controlled curvature-number of cycles required to ignite failure and critical ovalization-controlled curvature relationships Among five different diameters the experiment result of 6 mm is conducted by Yang [26] The moment-curvature relationships indicate that after the first bending cycle the moment-curvature loop becomes steady and the influence of the diameter of the redundant round-hole on the moment-curvature curve is infinitesimal However the ovalization-curvature relationships show that the greater the diameter of the redundant round-hole is the faster the ovalization increases Finally theoretical analysis models were respectively proposed to simulate the controlled curvature-number of cycles required to ignite failure and critical ovalization-controlled curvature relationships After comparing with experimental result the experimental data can be properly described by the theoretical models

Date of Award	2019
Original language	English
Supervisor	Wen-Fung Pan (Supervisor)