Abstract
Based on the bending theory of beams, combining with the constitutive relationship of shape memory alloy materials, the asymmetric bending of shape memory alloy beams under concentrated load was studied. Considering tension-compression asymmetry on both sides of the tension and compression in the process of bending, tension-compression asymmetry coefficient was introduced, by using the step-by-step method. The stress distribution, neutral axis displacement, curvature and phase boundary of the beam sections of the I-shaped cross-section shape memory alloy beam were analyzed. The results show that under the same load, the maximum offset of the neutral axis displacement increases with the increase of tension-compression asymmetry coefficient. Under the same tension-compression asymmetry coefficient, the displacement and curvature of the neutral axis increased with the increase of load; as tension-compression asymmetry coefficient increased, the proportion of mixed phase increased gradually, the proportion of martensite phase decreased, and the asymmetry of phase boundary became more obvious. Under the same conditions, the rectangular section is more suitable. The cross section of I shaped cross section was prone to occur phase transformation.
Highlights
The results show that under the same load, the maximum offset of the neutral ax⁃ is displacement increases with the increase of tension⁃compression asymmetry coefficient
Under the same tension⁃ compression asymmetry coefficient, the displacement and curvature of the neutral axis increased with the increase of load; as tension⁃compression asymmetry coefficient increased, the proportion of mixed phase increased gradually, the proportion of martensite phase decreased, and the asymmetry of phase boundary became more obvious
The stress distribution, neutral axis displacement, curvature and phase boundary of the beam sections of the I⁃shaped cross⁃section shape memory alloy beam were analyzed
Summary
YA1A = (1 + Δi ) h, yEE1 = εtf(1 + Δi ) h / εt , yC1C = εts(1 + Δi ) h / εt , yD1D = - εcs(1 + Δi ) h / εt , yF1F = - εcf(1 + Δi ) h / εt , yB1B = - (1 - Δi ) h 图中 A 表示奥氏体相,M 表示马氏体相,AM 表示混 (1 +Δ4) h -t d éêê σ εts(1+Δ4)h ts ë εt εty + Δ4)h 3.5 不同截面的 SMA 悬臂梁数值结果对比分析 图 11 至 12 为载荷 F = 20 N,拉压不对称系数 α Shape Memory Effect and Superelasticity of Alloy[ M] .
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