CAJ | 학술논문

为了得到船用907A钢的动态力学性能及本构关系，运用静态试验机及分离式Hopkinson压杆加载装置，在应变率为0．00033～2680 s－1范围内得到了准静态拉伸及动态压缩条件下的应力应变曲线，对比了Cowper?Symonds模型和Johnson?Cook模型，并基于CS模型对应变硬化效应进行了修正。结果表明，船用907A钢具有明显的应变率强化效应和非线性应变硬化效应；CS模型比JC模型更能准确描述其应变率强化效应。
위료득도선용907A강적동태역학성능급본구관계，운용정태시험궤급분리식Hopkinson압간가재장치，재응변솔위0．00033～2680 s－1범위내득도료준정태랍신급동태압축조건하적응력응변곡선，대비료Cowper?Symonds모형화Johnson?Cook모형，병기우CS모형대응변경화효응진행료수정。결과표명，선용907A강구유명현적응변솔강화효응화비선성응변경화효응；CS모형비JC모형경능준학묘술기응변솔강화효응。
In order to get the dynamic mechanical properties and constitutive relation of the ship?built steel 907A, the stress?strain curve within the scope of 0.000 33~2 680 s?1under quasi static stretching and dynamic compression condition was derived using the static testing machine and split Hopkinson press bar ( SHPB) . The Johnson?Cook ( JC) model and Cowper?Symonds ( CS ) model were compared and the hardening effect of strain was corrected based on the CS model. The results showed that ship?built steel 907A has a remarkable effect in strengthening strain rate and hardening nonlinear strain, and the CS model can describe the effect of strengthening strain more exactly than JC model.