Johnson-Cook本构模型是一种广泛应用于金属材料动态力学行为模拟的唯象模型,其核心是通过分段函数形式描述材料的应变硬化、应变率强化和温度软化效应。该模型需结合实验数据确定参数,并可与损伤模型结合用于失效分析。以下从模型构成、参数确定和应用场景三方面展开说明。 一、模型构成与...
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...
, which introduce large deformation, strain and strain rate hardening, thermal softening, and damage to the material. The material's dynamic constitutive behaviour can be aptly modelled by a visco-plasticity-based Johnson-Cook (J-C) strength model and damage initiation and complete failure by the...
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....
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....
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**...
2. Holmquist–Johnson–Cook Theoretical Model Holmquist, Johnson, and Cook proposed the Holmquist–Johnson–Cook (HJC) damage constitutive model to describe the nonlinear deformation and fracture characteristics of engineering and geological materials under large strain and high variability. This model consi...
Shimuzu et al, Basic Experiment with Mucin Ophthalmic Solution: Effect on Healing of Rabbit Corneal Epithelial Damage, Atarishi Ganka (Journal of the Eye), 1995, 1601-1605, 12(10). Shoji et al, Trapping Role in Mucin, Nippon Ganka Gakkai Zasshi (ACTA Soc. Ophthalmol Jpn), 1988, 2038-20...
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...
Initially, Johnson and Cook [1] reported a constitutive model and experimental data for metals including copper, brass, nickel, iron, etc., under LHH conditions. Later, the Johnson–Holmquist-Ceramics (JH-1) constitutive model was first presented by Johnson and Holmquist [2] to study the ...