摘要
提出了一个关于薄钢片动态撕裂试验能量分析法.在摆锤冲击试验机上按原始的实验方法获得了起始动态断裂韧性R0.dyn,和动态撕裂模量Tdyn.为了比较对同样材料进行了静态撕裂试验,以研究加载率V对断裂基本功Гe的影响.结果表明,在加载率1 mm/min到300 mm/min的变化范围内,断裂基本功Гe随加载率的对数略有下降.由于屈服应力随加载率而增加,作RO,dyn和Tdyn的比较时,观察到动态断裂韧性较之静态结果有一个明显的下降.
This paper presents an energy analysis during dynamic tearing tests of thin steel sheet. These experiments are performed on a Charpy test device using an original experimental method. Dynamic fracture toughness at initiation R0,dynand dynamic tearing modulus Tdyn are obtained. For a comparison purpose, static trousers tearing tests are conducted, on the same material, in order to study the influence loading rate V on the essential work of fracture Гe (calculated from Mai and Cotterell (1984) analysis) . We have shown that by varying the loading rate from 1 mm/min to 300 mm/min, the essential work of fracture Гe decreases slowly with the Logarithm of the loading rate V. A significant drop of dynamic fracture toughness compared to static one is observed, while making a comparison between R0,dyn andГe (1 mm/min) due to the increase of yield stress with loading rate.
出处
《宁波大学学报（理工版）》
CAS
2003年第4期342-348,共7页
Journal of Ningbo University：Natural Science and Engineering Edition
