Mode I crack growth rate of a ferromagnetic elastic strip in a uniform magnetic field
Mode I crack growth rate of a ferromagnetic elastic strip in a uniform magnetic field
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DOI：
10.1016/j.actamat.2006.06.048
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发表时间：
2006-11
期刊：
影响因子：
9.4
通讯作者：
Y. Shindo;F. Narita;K. Horiguchi;T. Komatsu
中科院分区：
文献类型：
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作者：
Y. Shindo;F. Narita;K. Horiguchi;T. Komatsu
应用多畴结构铁磁弹性材料理论，建立了在均匀磁场和I型拉伸载荷作用下，软铁磁材料中有限裂纹的裂纹扩展速率方程。考虑了平面应变和平面应力问题。Dugdale关于金属中塑性区的假设被应用于估计裂纹尖端周围的屈服效应。采用累积塑性位移准则求解裂纹扩展速率。对含单边裂纹的软铁磁条的裂纹扩展速率进行了数值计算，并将计算结果用图形显示出来。对镍铁软磁材料在超导磁体内腔中的单边裂纹平板试样进行了裂纹扩展速率试验，并将数值计算结果与实验结果进行了比较。
The theory of ferromagnetic elastic materials of multidomain structure is applied to develop a crack growth rate equation of a finite crack in a soft ferromagnetic material under mode I tensile loading and uniform magnetic field. The plane strain and plane stress problems are considered. Dugdale’s assumption regarding the plastic zone in metals is applied to estimate the effect of yield around the crack tip. The accumulated plastic displacement criterion is used for developing a solution for the crack growth rate. Numerical values of crack growth rate are obtained for a soft ferromagnetic strip with a single-edge crack and the results are displayed graphically. Crack growth rate tests are also conducted on nickel–iron soft magnetic materials with a single-edge cracked plate specimen geometry in the bore of a superconducting magnet, and a comparison is made between numerical results and experimental data.