The present work investigates the notch radius effect on fracture resistance using the finite element (FE) damage analysis based on the multiaxial fracture strain model. The damage model was determined from experimental data of notched bar tensile and fracture toughness test data using a sharp‐cracked compact tension specimen. Then, the FE damage analysis was applied to simulate fracture resistance tests of SM490A carbon steel specimens with different notch radii. Comparison of simulated results with experimental data showed good agreement. Further simulation was then performed to see effects of the specimen size, thickness, and side groove on J‐R curves for different notch radii. It was found that effects of the specimen size and thickness became more pronounced for the larger notch radius. Furthermore, it was found that without side groove, tearing modulus for notched specimens was similar to that for cracked specimens, regardless of the notch radius.

中文翻译：

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缺口钝性对SM490A碳钢抗断裂性能的数值预测

本工作使用基于多轴断裂应变模型的有限元（FE）损伤分析研究缺口半径对断裂阻力的影响。损伤模型是根据带缺口裂纹的拉力试验数据和断裂韧性试验数据，使用锋利的紧凑型拉力试样确定的。然后，利用有限元损伤分析来模拟具有不同缺口半径的SM490A碳钢试样的断裂抗力测试。模拟结果与实验数据的比较显示出很好的一致性。然后进行了进一步的仿真，以了解试样尺寸，厚度和侧槽对J - R的影响缺口半径的曲线。已经发现，对于较大的切口半径，样品尺寸和厚度的影响变得更加明显。此外，发现没有侧槽，有缺口的试样的撕裂模量与有裂纹的试样的撕裂模量相似，而与缺口的半径无关。