Calculation of Stress Intensity Factor for Surface Cracks in FeCrAl Cladding under Force-Irradiation Coupling
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摘要: 为研究高辐照剂量情况下铁素体FeCrAl包壳管对断裂失效破坏的抵抗能力，利用有限元方法结合Zencrack软件中的裂纹块分析技术，计算了内压和辐照肿胀应力耦合载荷作用下FeCrAl包壳管轴向半椭圆表面裂纹的裂尖应力强度因子。获得了不同辐照肿胀应变分布情况下内、外表面不同深度裂纹的裂尖应力强度因子变化规律，分析了辐照肿胀效应的影响作用。研究结果表明，相比于均匀辐照肿胀应变分布情况，包壳管在径向方向存在线性梯度变化的辐照肿胀应变时，内表面轴向半椭圆裂纹的裂尖应力强度因子水平显著降低，而外表面轴向半椭圆裂纹的裂尖应力强度因子水平显著提升。Abstract: In order to study the resistance of Ferritic FeCrAl alloy cladding to fracture failure under high radiation dose, the crack tip stress intensity factor of axial semi-elliptical surface crack of FeCrAl cladding tube under internal pressure and radiation swelling stress coupling load is calculated by finite element method combined with crack block analysis technique in Zencrack software. The change rule of stress intensity factor at crack tip with different depth on inner and outer surfaces under different radiation swelling strain distribution is obtained, and the influence of radiation swelling effect is analyzed. The results show that compared with the uniform radiation swelling strain distribution, when the radiation swelling strain of the cladding tube has a linear gradient in the radial direction, the crack tip stress intensity factor of the axial semi-elliptical crack on the inner surface decreases significantly. On the other hand, the crack tip stress intensity factor of the axial semi-elliptical crack on the outer surface increases significantly.
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Key words:
- FeCrAl /
- Irradiation swelling /
- Stress intensity factor /
- Semi-elliptical axial crack
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图 3 植入裂纹块后的局部加密示意图
Figure 3. Schematic Diagram of Local Densification after Implantation of Crack Block
图 4 假设包壳管辐照肿胀应变分布情况
Figure 4. Assumed Distribution of Irradiation Swelling Strain within Cladding Tube
图 5 内表面轴向半椭圆裂纹前沿各点的应力强度因子
Figure 5. Stress Intensity Factors at Each Point in Front of an Axial Semi-elliptical Crack on the Inner Surface
图 6 外表面轴向半椭圆裂纹前沿各点的应力强度因子
Figure 6. Stress Intensity Factors at Each Point in Front of an Axial Semi-elliptical Crack on the Outer Surface
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