In order to investigate the fracture toughness of 316 L stainless steel ,quasi-static three-point bending tests were conducted by the Instron -4505 universal testing machine using 316 L stainless steel samples which contain pre -existing cracks .From the tests ,its quasi-static fracture property parameters can be obtained:K I =53 .34 MPa m .Meanwhile , the tests were conducted to study this material ’ s dynamic fracture toughness bassed on SHPB technology .Its dynamic fracture toughness parameters can be obtained from the tests at three different loading rates .The results shows that:With the increasing of load rate,the dynamic fracture toughness of the material is decreased .316L stainless steel is the rate -sensitive material ,and the material has excellent fracture mechanical properties which can widely use in engineering practice .%为研究316 L型不锈钢的动静态断裂韧性，该文使用Instron－4505万能材料试验机对含有预制裂纹的316 L型不锈钢试样进行准静态三点弯曲实验，测得其准静态断裂韧性应力强度因子K I＝53．34 MPa m ，同时基于霍普金森压杆（ SHPB）技术对该材料三点弯曲试样进行动态断裂韧性的实验研究，测得其在3种不同加载率下的动态断裂韧性应力强度因子。结果表明：316 L型不锈钢是率敏感材料，随着加载率的增加，该材料的动态断裂韧性呈下降趋势，且其断裂力学性能优良，可在工程实际中广泛应用。
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