研究了50W800G硅钢板在不同加载路径下预裂纹试样的应力应变关系。结果表明:单轴45°和90°裂纹尖端垂直于裂纹线方向的应力应变曲线,其弹性模量与屈服强度较光滑试样都降低,说明了裂纹尖端应力、应变场的奇异性;双轴45°和90°裂纹尖端的应力应变曲线,在载荷比2∶1和3∶1时,裂纹尖端的应力虽有增加,但应变增加缓慢,应力应变曲线高于载荷比1∶1的加载曲线。 The stress-strain relationship of pre-cracked specimens of 50W800G silicon steel under different loading paths was studied. The results show that the stress-strain curves of 45 ° and 90 ° uniaxial crack tip perpendicular to the crack line have a lower elastic modulus and yield strength than the smooth specimen, which indicates the singularity of stress and strain field at crack tip. 45 ° and 90 ° crack tip stress-strain curve at the load ratio of 2: 1 and 3: 1, the crack tip stress increases, but the strain increases slowly, the stress-strain curve is higher than the load ratio of 1: 1 loading curve .