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Compression characteristics of spheroidal graphite cast iron pipe members

机译：球墨铸铁管件的压缩特性

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Spheroidal graphite cast iron can be made with shape freedom, and can be used often in critical parts of automobiles and industrial machinery that are designed using the allowable stress design method. However, spheroidal graphite cast iron has been regarded as having low ductility deriving from fracture. It has therefore never been used for structural members for construction purposes. Previous studies have not clarified the plastic deformation capacity and ultimate strength of the spheroidal graphite cast iron members, even though the material properties were estimated using many experimentally obtained results. As described in this paper, compression tests were performed to investigate the plastic behavior of the spherical graphite cast iron members, and to assess the relation between the collapse mechanism and the width-to-thickness ratio. Tensile strength of samples corresponded to 700 N/mm~2, 450 N/mm~2, and 400 N/mm~2. In addition, steel pipe material corresponding to 490 N/mm~2 was selected. Consequently, six specimens were used for the compression test. One was a steel pipe. The specimen diameters were 165.2 mm; the lengths were 450 mm, corresponding to approximately three times the diameter. The specimen thickness was 4 mm or 6 mm, with a width-to-thickness ratio of 41.3 or 27.5. The ultimate strength of spheroidal graphite cast iron pipe members is about twice the yield strength, even though the ultimate strength of the steel piles is equal to the yield strength. A crack was found on the pipe surface at the ultimate strength because the axial stress on the surface changes compression to tension by growing plate bending deformation of local buckling. Spheroidal graphite cast iron pipe members under compression loading exhibit brittle behavior after post local buckling.
机译：球墨铸铁可以不受形状限制地制造，并且可以经常用在使用容许应力设计方法设计的汽车和工业机械的关键部件中。然而，球状石墨铸铁被认为具有源自断裂的低延展性。因此，它从未被用于建筑目的的结构构件。以前的研究还没有弄清楚球墨铸铁件的塑性变形能力和极限强度，即使材料性能是通过许多实验获得的结果估算出来的。如本文所述，进行了压缩试验，以研究球形石墨铸铁构件的塑性行为，并评估塌陷机理与宽厚比之间的关系。样品的抗张强度分别为700 N / mm〜2、450 N / mm〜2和400 N / mm〜2。另外，选择对应于490N / mm〜2的钢管材料。因此，将六个样本用于压缩测试。一个是钢管。样品直径为165.2毫米；长度为450毫米，大约相当于直径的三倍。样品厚度为4mm或6mm，宽厚比为41.3或27.5。球形石墨铸铁管件的极限强度约为屈服强度的两倍，即使钢桩的极限强度等于屈服强度也是如此。在管表面上发现了一个极限强度的裂纹，这是因为表面上的轴向应力通过增大板的局部屈曲弯曲变形而将压缩力转变为张力。球形石墨铸铁管件在局部受压后呈现压缩特性。

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