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对含有裂纹的SM490钢试样,在拉伸断裂过程中使用变形-断裂测量装置和红外-温度测量装置对整个过程进行监测。通过夹位移、COD、裂纹尖端的温度变化和红外热像图分析了材料的性能与裂纹塑性变形和断裂时的力学特征。结果表明:轧制方向对含裂纹SM490钢的力学性能影响很小,在裂纹扩展中应力集中和滑移线对塑性热的产生与分布有较大影响。
For cracked SM490 steel specimens, the whole process was monitored during the tensile fracture using a deformation-fracture measurement device and an infrared-temperature measurement device. The mechanical properties of the material and the plastic deformation and fracture mechanics of the crack were analyzed by means of the displacement of the clamp, COD, the temperature change at the crack tip and the infrared thermogram. The results show that the direction of rolling has little effect on the mechanical properties of cracked SM490 steel. Stress concentration and slip line have a great influence on the generation and distribution of plastic heat in crack propagation.