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本文从V型切口尖端附近的应力场和位移场出发,按最大周向拉应力理论和最大用向拉应变理论,研究了Ⅰ—Ⅱ复合型V型切口的最大周向拉应力判据(即(σ_θ)_(max)判据)和最大周向拉应变判据(即(ε_θ)_(max)判据),完善了文献[1]所得的结果,使得反映Ⅱ型影响的参数f_σ能够唯一地确定,避免了其取值的任意性。最后用混凝土Ⅰ—Ⅱ复合型断裂试验的资料分析了这两种判据对于混凝土的适用性。分析表明,两种判据与试验资料都比较相符,其中尤以最大周向拉应变复合判据更为满意。
In this paper, starting from the stress field and displacement field near the V-notch tip, according to the maximum circumferential tensile stress theory and the maximum tensile strain theory, the maximum circumferential tensile stress criterion for the I-II composite V-notch is studied (ie, The (σ_θ)_(max) criterion and the maximum circumferential tensile strain criterion (ie, the (ε_θ)_(max) criterion) improve the results obtained in [1], enabling the parameter f_σ reflecting the influence of type II to be Uniquely determined to avoid the arbitrariness of its value. Finally, the applicability of the two criteria to the concrete was analyzed using the composite type I-II composite fracture test data. The analysis shows that the two criteria are in good agreement with the experimental data, especially the composite criterion of maximum circumferential tensile strain is more satisfactory.