低温环境中介质结冰时玻璃钢贮罐的应力分析

STRESS ANALYSIS OF A GFRP TANK UPON LOW-TEMPTERATURE ENVIRONMENT AND LIQUID FREEZING

根据复合材料热膨胀系数的细观力学分析,确定玻璃钢贮罐不同铺设单层的热膨胀系数;通过ANSYS大型通用有限元软件,计算了在低温环境下贮罐内的介质水结冰时由于体积膨胀受到约束而对贮罐产生的应力应变;计算分析了冰块厚度不同时贮罐的应力应变变化规律。计算结果表明,贮罐温度降低、水结冰对玻璃钢贮罐产生不可忽略的附加应力与应变;因贮罐结构设计为变厚度铺层,导致不同厚度的冰块对贮罐产生的最大应力应变差别不是很大;低温环境下使用时,建议贮罐设计时考虑低温与结冰工况的影响。

According to the mesoscopic mechanics analysis on thermal expansion coefficients of composite materials,the thermal expansion coefficients of different layers in a GFRP tank are determined.Stress of the GFRP tank upon low-temperature environment and liquid freezing is simulated by using ANSYS.The change laws of the stresses and strains upon different ice thickness are discussed.The results show that additional stress is generated by low temperature and liquid freeze.There is no obvious difference between the stress and strain upon different ice thickness due to different thickness of the GFRP tank at different places.When being used in low temperature environments,it is recommended that low temperature and freezing condition should be involved in tank-design.