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2219-T6鋁合金FSW接頭疲勞壽命預測
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-07-27
通過對2219-T6鋁合金攪拌摩擦焊對接接頭進行金相觀察、疲勞試驗和顯微硬度測量，對接頭的不均勻性和疲勞性能進行分析。
2219-T6鋁合金FSW接頭疲勞壽命預測Fatigue life prediction of FSW joints for 2219-T6 aluminum
alloy
通過對2219-T6鋁合金攪拌摩擦焊對接接頭進行金相觀察、疲勞試驗和顯微硬度測量，對接頭的不均勻性和疲勞性能進行分析。結果表明，接頭最低硬度和疲勞源基本都在熱影響區。基于接頭各區的顯微硬度、微觀形貌及微拉伸試驗測試，建立接頭的彈塑性有限元模型，并在循環加載下模擬接頭的應力和應變分布。利用Smith-Watson-Topper損傷公式和性能薄弱區域的應力、應變數據對焊接接頭進行疲勞壽命預測，預測結果與試驗結果相比，壽命誤差基本在兩倍因子之內。
The inhomogeneity and fatigue properties of the friction
stir welded butt joints for 2219-T6 aluminum alloy were analyzed by
metallographic observation of different zones, fatigue tests and micro-hardness
measurement. The results show that the lowest hardness and fatigue crack
initiation sites are mainly located in heat affected zone. The elastic-plastic
FE model was established based on the micro-hardness, microstructure and the
mechanical properties obtained from micro-tensile tests of every zone. The
stress and strain distributions of joints were simulated under cyclic loading.
According to the FE simulations results, the fatigue lives were estimated by
using the damage equation of Smith-Watson-Topper and the stress-strain data of
the weak area in the joints. The results of estimations are compared with the
test results and the errors are less than two times of factors.
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