316L三点弯曲试样动静态断裂韧性对比实验研究  

Experimental study of 316L stainless steel three-point bend specimen fracture toughness under different strain rates

作　　者：曲嘉[1] 庞跃钊 孙晓庆 

机构地区：[1]哈尔滨工程大学航天与建筑工程学院,黑龙江哈尔滨150001

出　　处：《中国测试》2016年第11期13-16,共4页China Measurement & Test

基　　金：国家自然科学基金(11302055)

摘　　要：为研究316L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316L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 MPam,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:316L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。In order to investigate the fracture toughness of 316L stainless steel, quasi -static three -point bending tests were conducted by the Instron -4505 universal testing machine using 316L stainless steel samples which contain pre - existing cracks. From the tests, its quasi - static fracture property parameters can be obtained： KI = 53. 34MPa √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.

关 键 词：断裂韧性 三点弯曲试样 霍普金森压杆 316L型不锈钢 

分 类 号：O346.1[理学—固体力学]