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<p>Standards are well-established to measure materials mechanical properties using common standardized specimens and techniques. However, intensive research focuses on utilizing non-conventional specimens to simulate the real-world operating conditions of mechanical elements. In the current study, a novel ball-ring expansion technique (BRET) was used to determine the mechanical properties of aluminum Al 6082 alloy. The BRET test rig consists of a small ring specimen expanded by a ball pressed inside it. The tested ring specimens were cut from an aluminum Al 6082 alloy rod to make rings with an internal diameter of 46&#xa0;mm and different wall thicknesses of 2, 4, and 6&#xa0;mm. A solid steel ball of an external diameter of 48&#xa0;mm was pressed to pass through the ring causing the ring specimen to expand radially. The force applied to the ball and its corresponding displacement were recorded. The hoop strain developed in the ring specimens was recorded. The relationship between the hoop stress and hoop strain, in rings’ outer surface, was determined and compared to the aluminum alloy engineering stress–strain curve. In addition, finite element analyses (FEA) were carried out to validate the use of the hoop stress and the hoop strain as the stress–strain data of the ring material. The results of the predicted values of yield and ultimate tensile strengths using the BRET were only about 4% different from the conventional tensile test data. The obtained results highlight how promising the proposed ball-ring expansion technique is for determining the mechanical properties of engineering materials.</p>

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Determination of Mechanical Properties of Aluminum 6082 Using a Novel Ball-Ring Expansion Technique

  • 期刊论文

  • 发表日期：

    2025年5月22日

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  • M. Saber,
  • Y. El-Taybany

摘要

Standards are well-established to measure materials mechanical properties using common standardized specimens and techniques. However, intensive research focuses on utilizing non-conventional specimens to simulate the real-world operating conditions of mechanical elements. In the current study, a novel ball-ring expansion technique (BRET) was used to determine the mechanical properties of aluminum Al 6082 alloy. The BRET test rig consists of a small ring specimen expanded by a ball pressed inside it. The tested ring specimens were cut from an aluminum Al 6082 alloy rod to make rings with an internal diameter of 46 mm and different wall thicknesses of 2, 4, and 6 mm. A solid steel ball of an external diameter of 48 mm was pressed to pass through the ring causing the ring specimen to expand radially. The force applied to the ball and its corresponding displacement were recorded. The hoop strain developed in the ring specimens was recorded. The relationship between the hoop stress and hoop strain, in rings’ outer surface, was determined and compared to the aluminum alloy engineering stress–strain curve. In addition, finite element analyses (FEA) were carried out to validate the use of the hoop stress and the hoop strain as the stress–strain data of the ring material. The results of the predicted values of yield and ultimate tensile strengths using the BRET were only about 4% different from the conventional tensile test data. The obtained results highlight how promising the proposed ball-ring expansion technique is for determining the mechanical properties of engineering materials.