再看abaqus里面关于Johnson-Cookdamageinitiation的定义equivalentplasticstrainattheonsetofdamage,,isassume如果d3取正值,按照abaqus的定义,应力三轴度η几乎总是负值,则-d3*η几乎大部分情况取正,以AISI4340为例,d1=0.05,d2=3.44,d3=2.12(d3本来是-2.12,但按照abaqus里面的定义,理论上要取相反数),d4=0.002,d...
再看abaqus里面关于Johnson-Cook damage initiation的定义equivalent plastic strain at the onset of damage,, is assume 如果d3取正值,按照abaqus的定义,应力三轴度η几乎总是负值,则-d3*η几乎大部分情况取正, 以AISI 4340为例, d1=0.05, d2=3.44, d3=2.12(d3本来是-2.12,但按照abaqus里面的定义,理论上...
Cook failure model is available as part of the family of damage initiation criteria, which is the recommended technique for modeling progressive damage and failure of materials.Discussed further in Lecture 5.*MATERIAL,NAME=COPPER*DENSITY 8.96E3,*ELASTIC 124.E9, 0.34*PLASTIC,HARDENING=JOHNSON COOK**...
The target material behavior was modeled by the Johnson–Cook material model that induced both plastic deformation and damage mechanism. Good agreement was obtained between the experimental measurements and numerical predictions for all testing conditions....
The mesh objectivity is obtained by developing two nonlocal formulations of the well known Johnson-Cook damage criterion: an integral and a gradient enhanced formulation. Unlike previous nonlocal models in which the nonlocal variable is the plastic strain, we adopt the ratio of the plastic strain...
再看abaqus里面关于Johnson-Cookdamageinitiation的定义equivalentplasticstrainattheonsetofdamage,,isassume如果d3取正值,按照abaqus的定义,应力三轴度η几乎总是负值,则-d3*η几乎大部分情况取正,以AISI4340为例,d1=0.05,d2=3.44,d3=2.12(d3本来是-2.12,但按照abaqus里面的定义,理论上要取相反数),d4=0.002,d...
Cook failure model is available as part of the family of damage initiation criteria, which is the recommended technique for modeling progressive damage and failure of materials.Discussed further in Lecture 5.*MATERIAL,NAME=COPPER*DENSITY 8.96E3,*ELASTIC 124.E9, 0.34*PLASTIC,HARDENING=JOHNSON COOK**...
再看abaqus里面关于Johnson-Cookdamageinitiation的定义equivalentplasticstrainattheonsetofdamage,,isassume如果d3取正值,按照abaqus的定义,应力三轴度η几乎总是负值,则-d3*η几乎大部分情况取正,以AISI4340为例,d1=0.05,d2=3.44,d3=2.12(d3本来是-2.12,但按照abaqus里面的定义,理论上要取相反数),d4=0.002,d...
再看abaqus里面关于Johnson-Cookdamageinitiation的定义equivalentplasticstrainattheonsetofdamage,,isassume如果d3取正值,按照abaqus的定义,应力三轴度η几乎总是负值,则-d3*η几乎大部分情况取正,以AISI4340为例,d1=0.05,d2=3.44,d3=2.12(d3本来是-2.12,但按照abaqus里面的定义,理论上要取相反数),d4=0.002,d...
In this research work, finite element simulation and the Johnson and Cook damage model have been used to optimize the punching process. This damage model defines the material fracture as a function of triaxiality, the plastic deformation rate and temperature [19]. Using this damage model, it is...