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The Impact Fracture Behavior of Aluminum Alloy 2024-T351: Influence of Notch Severity

机译:铝合金2024-T351的冲击断裂行为:缺口强度的影响

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摘要

In this paper, the interactive influences of notch severity and test temperature on the impact properties and fracture behavior of a Al-Cu-Mg alloy 2024 in the T351 microstructural condition is presented and discussed. Notch angles of 45, 60, 75, and 90 deg were chosen for a standard Charpy impact test specimen containing two notches. For a given angle of the notch, an increase in dynamic fracture toughness, with test temperature, is most significant for the least severe of the notches, i.e., 45 deg. At a given test temperature, the impact toughness decreased with an increase in notch severity. An increase in notch severity resulted in Mode I dominated failure at all test temperatures. The influence of localized mixed-mode loading is minimal for the alloy in the T351 microstructural condition. The impact fracture behavior of the alloy is rationalized in light of alloy microstructure, mechanisms governing fracture, and the deformation field ahead of the propagating crack.
机译:本文提出并讨论了缺口强度和测试温度对T351微结构条件下Al-Cu-Mg合金2024的冲击性能和断裂行为的交互影响。对于包含两个槽口的标准夏比冲击试验样品,选择45、60、75和90度的槽口角。对于给定的切口角度,对于最不严重的切口(即45度),动态断裂韧性随测试温度的增加最为明显。在给定的测试温度下,冲击韧性随着缺口强度的增加而降低。缺口严重性的提高导致在所有测试温度下I型占主导地位的故障。在T351显微组织条件下,合金的局部混合模式载荷影响最小。根据合金的微观组织,控制断裂的机理以及在扩展裂纹之前的变形场,可以合理地确定合金的冲击断裂行为。

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