A cohesive zone modeling (CZM) approach is adopted to model crack extensions in as-received and hydrided curved compact tension (CCT) specimens of irradiated Zr-2.5Nb pressure tube materials at room temperature. With the CZM approach, two-dimensional finite element analyses are conducted to model the crack extensions in the CCT specimens. A varying cohesive energy approach is adopted, where the varying cohesive energy is determined based on the experimental J-R curves. The two-dimensional computational load-displacement-crack extension curves agree well with the experimental results. The lower identified cohesive energy and cohesive strength for the hydrided CCT specimen indicate the effects of brittle hydrides.

在室温下，采用内聚区建模（CZM）方法对辐照过的Zr-2.5Nb压力管材料的水化弯曲压实试样的裂纹扩展进行建模。使用CZM方法，进行了二维有限元分析，以模拟CCT试样中的裂纹扩展。采用变化的内聚能方法，其中基于实验的JR曲线确定变化的内聚能。二维计算的载荷-位移-裂纹扩展曲线与实验结果吻合良好。氢化CCT样品的较低的确定的内聚能和内聚强度表明了脆性氢化物的影响。