一种医疗放射源运输容器冲击试验和数值仿真  

Impact test and numerical simulation on a model container for transport of medical radioactive sources

作　　者：李国强[1] 李志强[2] 罗晓渭[1] LI Guoqiang;LI Zhiqiang;LUO Xiaowei(China Institute for Radiation Protection,Taiyuan 030006;Taiyuan University of Technology,Taiyuan 030024)

机构地区：[1]中国辐射防护研究院,山西太原030006 [2]太原理工大学,山西太原030024

出　　处：《辐射防护》2020年第1期52-57,共6页Radiation Protection

摘　　要：设计了一种用于运输和储存医疗用密封放射源的运输容器,外形尺寸为φ1 141 mm×1 206 mm,质量约3 600 kg,满载444 TBq(12 000 Ci)60Co放射源时属于B型货包,根据GB 11806和SSR-6的要求进行验证货包经受事故能力的自由下落试验Ⅰ(冲击试验)。采用三维非线性显式动力分析软件ANSYS/LS-DYNA对货包顶角下落冲击试验进行了计算分析,结果表明在冲击部位约200 mm×200 mm范围内受力较大,2条螺栓可能断裂,冲击部位最大变形量为45. 9 mm。进行了顶角下落试验,测量了外容器外壳的应力和容器的变形。将计算结果与试验结果进行了比较,其结果相互吻合,表明了有限元算法应用于大冲击的破坏性试验中,可很好地预测应力最大区和形变量。A model container is designed to transport and store radio-therapeutic sealed sources with φ1,141 mm×1,206 mm dimension and about 3,600 kg in mass. The container belongs to type B package when being loaded maximum activity up to 444 TBq(12,000 Ci) for 60Co. The package should be tested subject to the free drop testⅠ(i.e. impact test) according to GB 11806 and SSR-6,which is one of test items for demonstrating its ability to withstand accident conditions of transport. The ANSYS/LS-DYNA code based on finite element method is used to analyze stress and deformation during impact. Under top corner impact condition,the results show that there is larger stress at the impacted position about 200 mm × 200 mm square with 45. 9 mm maximum deformation and two bolts may be ruptured. Stress on the outer shell of the outer container was measured during the test and the deformation of the container was measured after the test. The results show consistency between calculation and test,which verifies that finite elements method can be used to well predict the stress and deformation fields before intensive impact destructive test.

关 键 词：放射源 运输容器 冲击试验 有限元法 数值仿真 

分 类 号：TL932.1[核科学技术—辐射防护及环境保护]