磁力矩器用磁性材料力學性能研究
Mechanical properties of magnetic materials for magnetic torquer
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摘要: 為確定用于磁力矩器的鐵鎳合金、鐵鈷合金和鐵鋁合金3種磁性材料的力學性能,，對它們進行了力學拉伸試驗,，發(fā)現(xiàn)材料塑性不同會對試件斷裂位置產(chǎn)生一定影響，主要表現(xiàn)為塑性材料在設計薄弱部位斷裂,，而脆性材料在夾持應力集中位置斷裂,。根據(jù)這一結果,，對拉伸試驗進行有限元模擬分析，計算結果表明導致斷裂位置差異的原因主要是設計薄弱部位的長度以及試件夾持部位出現(xiàn)應力集中,。依據(jù)有限元計算結果,，對試件進行了改進設計并重新模擬計算，結果顯示,，改進后的3種合金材料試件在拉伸試驗中其斷裂部位均出現(xiàn)在設計薄弱部位,。鐵鈷合金試件改進后的拉伸試驗也充分驗證了模擬計算的準確性。由此給出了3種材料合理的力學性能參數(shù),。Abstract: A tension test is used to investigate the mechanical properties of three magnetic materials for the magnetic torque, namely, ferronickel, ferro-cobalt, and ferro. aluminium. Because the three materials have different plasticities。their fractures should appear in different positions in the specimens, which are the weak positions, while for brittle materials, damages appear at the clip positions of the stress concentration. A finite element analysis shows that the length of the weak part and me stress concentration at the clip part determine the fracture position in the tension test. Thus, an improvement of the design is suggested with another round of simulation analysis. It is shown that for the improved specimens of three materials under the same conditions. the fractures all occur at their weak part. and are less affected by the stress concentration. The reasonable mechanical properties of these three materials can thus be obtained.
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