誘導孔對鋁合金薄壁梁軸向壓縮變形行為的影響
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-04-01
以6063鋁合金薄壁梁結構為研究對象，采用準靜態軸向加載的方式，借助WAW-E600型微控萬能試驗機，探明誘導孔結構對鋁合金薄壁梁壓縮變形行為與吸能性能的影響規律。
誘導孔對鋁合金薄壁梁軸向壓縮變形行為的影響Effect of cut-outs on axial collapse behaviors ofaluminum with thin-walled structure以6063鋁合金薄壁梁結構為研究對象，采用準靜態軸向加載的方式，借助WAW-E600型微控萬能試驗機，探明誘導孔結構對鋁合金薄壁梁壓縮變形行為與吸能性能的影響規律。研究表明：單排誘導孔能夠使試樣的變形模式由歐拉模式轉變為混合模式，提高試樣變形的穩定性，降低載荷峰值，吸能性能增加26.78%。多排誘導孔的位置與尺寸對薄壁梁的變形有較大影響，試樣中部的誘導孔會降低結構穩定性，使試樣失穩以歐拉模式變形為主，其載荷水平及吸能性能均較低；尺寸呈梯度變化的誘導孔能夠使試樣發生手風琴模式的變形，試樣順序壓潰，載荷波動平穩，吸能性能較高；大尺寸誘導孔會使試樣在局部發生剪切變形并逐層順序壓潰，其載荷平穩，是一種新的變形模式。通過實驗數據對比，系統研究誘導孔尺寸對臨界載荷的影響規律，并基于線形回歸理論，建立鋁合金薄壁梁結構臨界載荷與截面慣性矩之間的定量關系。
The effect of cut-outs on deformation behaviors and energy absorption of 6063 aluminum with thin-walled structures will be investigated by quasi-static axial compression using WAW-E600 microcomputer controlled universal testing machine. The results show that the deformation mode of the aluminum extrusions is changed from Euler mode to Mixed mode after setting single line cut-outs on the specimen, and the energy absorption increases 26.78%. The deformation behavior is more stable and the peak force is lower than that of the complete sample during compression. The size and position of cutouts have very significant effects on axial collapse behaviors of aluminum thin-walled structure. The aluminum samples buckle under Euler mode with poor performance of deformation stability, loading force and energy absorption, because cut-outs locate in the middle of extrusions. Gradually changing size of cut-outs could leads that the compression behaviors become concertina mode. The aluminum extrusions collapse from top to bottom sequentially with steady load curve and excellent energy absorbing performance. Large cut-outs will introduce local buckling with shear deformation. The compression behavior is a new mode, which has stable load and successive collapse process. Based on the experimental data, the influence of cut-outs size on the critical force was studied. The relationship between critical force and inertia of the thin-walled structure was established by using linear regression.
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