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首页> 外文会议>13th International conference on fracture >Based on Micromechanical Damage of Q345 Specimen's Acoustic Emission Quantitative Assessment in Tensile Process
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Based on Micromechanical Damage of Q345 Specimen's Acoustic Emission Quantitative Assessment in Tensile Process

机译：基于Q345拉伸过程中声发射定量评估的微机械损伤

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摘要

To further reveal the mesomechanical damage behavior of the plastic material, quantitative evaluation the micromechanical damage state of material use acoustic emission characteristic parameters. Based on the Gurson-Tvergaard-Needleman micromechanical damage model, establish the quantitative evaluation model of acoustic emission cumulative hits, taking void growth ratio as the damage variable. Taking steel Q345 notched bar specimens tensile process as example, using acoustic emission testing technology, get the AE information from yield to fracture process. Using ABAQUS finite element analysis software, analyze the meso-damage process during tensile process of steel Q345 notched bar specimens, and get the numerical solution of meso-damage parameters. Based on AE testing and Finite Element Simulation, get the quantitative evaluation formula of void growth ratio based on AE cumulative hits N during Q345 steel notched bar specimens tensile process. Result shows that, in the tensile process of Q345 steel from yield to fracture damage, the function relationship of N and VG is divided into two stage, linear damage stage and nonlinear damage stage, and when the N reaches 128, the material is at the transition state from linear damage stage to nonlinear damage stage. This critical transition area value could be used as steel Q345 damage fracture of acoustic emission recognition feature and safety evaluation threshold value.
机译：为了进一步揭示塑料材料的细观机械损伤行为，使用声发射特征参数定量评估材料的微机械损伤状态。在Gurson-Tvergaard-Needleman微机械损伤模型的基础上，建立了以空洞增长率作为损伤变量的声发射累积碰撞定量评估模型。以Q345钢带缺口试件的拉伸过程为例，利用声发射测试技术，获得了从屈服到断裂过程的声发射信息。利用ABAQUS有限元分析软件，对Q345带缺口钢筋试件拉伸过程中的细观损伤过程进行分析，得到细观损伤参数的数值解。通过AE测试和有限元模拟，得出了Q345型钢带缺口试件拉伸过程中基于AE累积冲击量N的空隙率的定量评价公式。结果表明，在Q345钢从屈服到断裂破坏的拉伸过程中，N和VG的函数关系分为线性破坏阶段和非线性破坏阶段两个阶段，当N达到128时，材料处于破坏状态。从线性损伤阶段到非线性损伤阶段的过渡状态。该临界过渡面积值可作为钢Q345声发射识别特征的损伤断裂和安全性评估阈值。

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