关键词:航空发动机,风扇/压气机,叶片,硬物损伤,数值模拟,本构模型,失效模型,参数估计基于Johnson-Cook模型的硬物损伤数值模拟研究・II・ABSTRACTForeignobjectdamage(FOD)eventstofan/compressorbladesoftenoccurduringtheoperationofaeroengine.Theyareverydangeroustotheflyingsaftyofaeroengineandaircraft.NumericalmodelingofFOD...
5 点击界面左侧的【material edit】图标,如图所示,点击create创建新的材料,并在弹出的面板上选择【mechanic】-【damage for ductile metal】-【Johnson-Cook damage】,这个就是Johnson-Cook损伤模型了 6 在Johnson-Cook损伤模型中填入相关的参数,最好采用试验值,这样我们就完成了Johnson-Cook损伤模型的定义 注意事...
The validation of the J–C plasticity and damage model provides the basis for using this material model in Acknowledgements This project was funded by the Vertical Lift Consortium (VLC), formerly the Center for Rotorcraft Innovation and the National Rotorcraft Technology Center (NRTC), U.S. Army...
这种由硬物造成的冲击损伤通常被称为“外物损伤”(ForeignObjectDamage,FOD)。常见的外物损伤形貌如图l所示。从图1中的外物损伤形貌町以看出,硬物冲击过程中常仆随着叶片的局部大塑性变形和断裂失效。因此要准确地数值模拟FOD过程,必须建立台理的村料辛相关本构模型。多年来.人们己提出多种率相关率构模型.例如Johnson...
In the Johnson-Cook damage model, there are five material constants viz. D1, D2, D3, D4 and D5, and it is very difficult to find out all of these material constants by experiments. The main objective of the present research is to determine the most sensitive parameter out of these ...
It co&d be that the damage does not accumulate in the manner specified by the model. It could also be that the model and/or data do not extrapolate into the more extreme regions of strain rate, temperature and/or pressure. Also, the fracture status of the OFHC copper and Armco iron ...
pressure and damage model constants were determined by f itting the HJC model to the experimental data obtained from the triaxial compression_ tests and uniaxia l SHPB tests.The obtained HJC parameters were used to numerically simulate the SHPB tests of the sandstone samples using f inite ...
damage evolution Johnson Cook s strength model C30 concrete 第 25 卷增 1 施绍裘等 国产 C30 混凝土考虑率型微损伤演化的改进的 Johnson Cook 强度模型 3251 1 引引 言言 1983 年 在第 7 届国际弹道会议上 G R Johnson 和 W H Cook 报告了描述金属变形中与应 变硬化 温度 应变率相关的计算模型 即 ...
lesson_title%%step_title%The progressive damage and failure models are generally recommended over these models which are restricted to high-strain-rate dynamic problems.These models are commonly used with Johnson-Cook plasticity, because Johnson-Cook plasticity is typically used to model high-strain-...
国产C30混凝土考虑率型微损伤演化的改进Johnson-Cook强度模型