铝合金型材融合口材料疲劳极限测定

摘要/Abstract

摘要： 为了测试口形铝合金型材融合口处材料的疲劳极限，针对型材尺寸、形状和融合口位置的特殊性——不能设计成符合现有规范的标准疲劳试样形状，设计了L形缺口试样及其疲劳试验夹具。通过有限元模拟试验载荷、仿真试样应力分布，应用数值回归的方法求解出最大应力值，确立了试验载荷与L形缺口试样疲劳应力之间的函数关系。利用设计的试样和夹具进行升降法试验，测得了一种口形铝合金型材融合口处材料的疲劳极限，并对试样进行了断口分析。

关键词: 铝合金型材, 融合口, L形缺口试样, 升降法试验, 疲劳极限

Abstract: In order to determine fatigue limit of fusion-mouth material of extruded aluminum alloy, the L-shaped notched specimens and their fixture were designed under the circumstance that those materials might not be designed as the normal standard fatigue specimens due to their special positions and sizes. Firstly, stresses on different locations of the tested L-shaped notched specimens were solved using finite element method. Then, the maximum stresses were approximated by means of the numerical regression method. Thus, the relationship between test load and fatigue stress might be explained by an equation. In order to determine the fatigue limit of the located-in-fused-mouth materials of a kind of extruded aluminium alloy profiles, an up-and-down program was also tested for the designed L-shaped notched specimen by designed fixture, and the fracture samples were also analysed.

Key words: extruded aluminium alloy profile, fusion mouth, L-shaped notched specimen, up-and-down test, fatigue limit

中图分类号:

TH122

白鑫, 谢里阳, 佟安时, 李铭, 谭秀峰. 铝合金型材融合口材料疲劳极限测定[J]. 中国机械工程.

Bai Xin, Xie Liyang, Tong Anshi, Li Ming, Tan Xiufeng. Fatigue Limit Test of Fusion-mouth Material of Extruded Aluminum Alloy Profile[J]. China Mechanical Engineering.

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