Dong CHEN
,
Jingdong CHEN
,
Yinglu ZHAO
,
Benhai YU
,
Chunlei WANG
,
Deheng SHI
金属学报(英文版)
doi:10.1016/S1006-7191(08)60082-4
The equilibrium lattice parameter, relative volume V/V0, elastic constants Cij, and bulk modulus of titanium nitride are successfully obtained using the ab~initio plane-wave pseudopotential (PW-PP) method within the framework of density functional theory. The quasi-harmonic Debye model, using a set of total energy vs molar volume obtained with the PW-PP method, is applied to the study of the elastic properties and vibrational effects. We analyze the relationship between the bulk modulus and temperature up to 2000 K and obtain the relationship between bulk modulus B and pressure at different temperatures. It is found that the bulk modulus B increases monotonously with increasing pressure and decreases with increasing temperature. Moreover, the Debye temperature is determined from the non-equilibrium Gibbs functions.
关键词:
Elastic constants
,
null
,
null
,
null
严博燕
,
侯晓
,
陈慧
,
刘芹
宇航材料工艺
doi:10.3969/j.issn.1007-2330.2014.03.005
针对传统方法测量C/C复合材料弹性模量精度差问题,提出了一种利用模态试验辨识材料弹性模量的新方法.数值仿真结果表明板件材料振动频率与弹性模量之间存在模糊对应关系,利用此关系采用二分法及二阶响应面近似模型对材料弹性模量进行辨识,并分别利用各向同性薄壁板件及正交各向异性薄壁板件对此方法进行验证,计算结果误差最大为16.67％,最小仅为0.5％,表明该方法准确有效.最后将其应用于针刺C/C复合材料,获得了其弹性模量.仿真及试验结果均表明该方法无损、高效且准确度高.
关键词:
针刺C/C复合材料
,
弹性模量
,
模态试验
,
有限元数值模拟
,
二阶响应面模型
