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四点弯曲缺口试样在微观断裂机理研究中经常采用。解理断裂应力的测定和解理断裂判据的建立,均以试样中的应力提升系数 R=σ_(1max)/σ_y 的准确确定和缺口顶端应力场的准确分析为前提。目前这方面的工作普遍利用 Griffiths 等~([1])按线性硬化假定得到的有限元计算结果。但多数结构钢具有幂硬化特性,且不同钢种具有不同的硬化指数 n,
Four-point bending notched specimen is often used in the study of microscopic fracture mechanism. The determination of cleavage fracture stress and the cleavage fracture criterion are all based on the accurate determination of the stress riser coefficient R = σ 1max / σy in the specimen and the accurate analysis of the stress field at the tip of the notch. At present, the work of Griffiths et al. ([1]) is widely used in the work of finite element calculation based on the linear hardening assumption. However, most structural steels have power hardening characteristics, and different steels have different hardening indices n,