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为了能够更好掌握冷弯非薄壁方管(壁厚大于6mm)的受力性能,考虑不同的壁厚、宽度、加工工艺和钢号,对冷弯非薄壁方管的平板部位、弯角部位以及平板与弯角交界部位进行了材性试验。结合国内外以往的研究成果,对比发现:所测试的方管角部的屈服强度及抗拉强度都要大于平板部位,角部的屈服强度的提高幅度要大于其抗拉强度;平板与弯角交界部位的材料强度与平板部位相比,并没有表现出明显的提高;虽然方管所有部位的屈服强度及抗拉强度均有不同程度的提高,但它们的强屈比及拉断后的伸长率却有不同程度的降低;材料的应力-应变全过程曲线呈现“无明显屈服平台”的特性,弯角部位的材料强化模量要明显大于平板部位,先圆后方工艺的方管材料的强化模量要大于直接成方的方管。最后,在试验结果的基础上,提出了冷弯非薄壁方管材料力学性能的分析模型。
In order to better grasp the cold bending non-thin-walled square tube (wall thickness greater than 6mm) of the force performance, considering the different wall thickness, width, processing technology and steel number, cold-formed non-thin square tube flat plate parts, Material testing was conducted at the junction with the bend. According to the previous research results both at home and abroad, it is found that the yield strength and tensile strength of the square pipe corner are greater than that of the flat plate, and the yield strength of the corner is greater than the tensile strength. The strength of the material at the junction did not show obvious improvement compared with that of the flat plate. Although the yield strength and tensile strength of all the square pipes increased to some extent, their flexural strength and tensile elongation The curve of the whole process of stress-strain of the material presents the characteristic of “no obvious yield platform”, the material modulus of reinforcement at the corner is obviously larger than that of the flat plate, and the material of the square pipe The strengthening modulus is greater than the square tube directly into the square. Finally, on the basis of the experimental results, an analytical model of the mechanical properties of cold-formed non-walled square tube materials is proposed.