高压物理学报2016，Vol.30Issue(4)：301-310,10.DOI:10.11858/gywlxb.2016.04.006
PBX炸药含各向异性损伤的黏弹性统计微裂纹本构模型初步研究
Initial Study on Constitutive Model of PBXs via Viscoelastic Statistical Crack Mechanics Including Anisotropic Damage
摘要
Abstract
Building constitutive models that include damage is the foundation for the research of dynam-ic mechanical responses of explosives.Based on the viscoelastic character on macroscale and the crack directions on mesoscale,we established a viscoelastic statistical crack mechanics including anisotropic damage,and then obtained the simplified constitutive model under uniaxial loading.By using a numeri-cal program,and taking PBX9501 as an example,we analyzed the extension rules of cracks with vari-ous directions,and the strength-difference and strain-rate dependence of failure strength and critical strain of explosives.Furthermore,we discussed the sensitivity of 4 main parameters,the crack number density,the initial crack size,the friction coefficient between crack surfaces and the fracture surface energy.The result demonstrates that the 4 parameters greatly affect the extension and evolvement of cracks,which causes the different mechanical responses of explosives.关键词
PBX炸药/各向异性损伤/黏弹性统计微裂纹本构模型/单轴加载Key words
PBX explosive/anisotropic damage/visco statistical crack mechanics/uniaxial loading分类
数理科学引用本文复制引用
张延耿,楼建锋,周婷婷,洪滔,张树道..PBX炸药含各向异性损伤的黏弹性统计微裂纹本构模型初步研究[J].高压物理学报,2016,30(4):301-310,10.基金项目
国家自然科学基金（11302031，11372053，11402031）；中国工程物理研究院安全弹药研发中心开放基金（RMC2014B02）；中国工程物理研究院科学技术发展基金 （）
