宁波大学学报(理工版)
寧波大學學報(理工版)
저파대학학보(리공판)
JOURNAL OF NINGBO UNIVERSITY (NSEE)
2013年
2期
68-72
,共5页
各向同性钢材%断裂模型%屈服模型%特征应力%主应力空间%二次函数
各嚮同性鋼材%斷裂模型%屈服模型%特徵應力%主應力空間%二次函數
각향동성강재%단렬모형%굴복모형%특정응력%주응력공간%이차함수
isotropic steels%fracture model%yield model%characteristic stresses%principal stress space%quadratic function
基于钢材断裂前必先屈服的基本事实,以钢材断裂面为屈服面后继扩大直至材料完整性(连续性)发生破坏为假设,以已有的屈服模型的共同特征为切入点,建议了各向同性钢材在主应力空间的二次函数型断裂模型和屈服模型.根据不同钢材的特征应力值,量化了各向同性钢材的二次函数型断裂模型和屈服模型.依据不同钢材的特征应力值的相互关系,建议的各向同性钢材的二次函数型断裂模型和屈服模型相应地描述为主应力空间的圆柱面、椭球面、抛物面和双曲面.建议的各向同性钢材的二次函数型断裂模型和屈服模型较已有的强度模型更具一般性.
基于鋼材斷裂前必先屈服的基本事實,以鋼材斷裂麵為屈服麵後繼擴大直至材料完整性(連續性)髮生破壞為假設,以已有的屈服模型的共同特徵為切入點,建議瞭各嚮同性鋼材在主應力空間的二次函數型斷裂模型和屈服模型.根據不同鋼材的特徵應力值,量化瞭各嚮同性鋼材的二次函數型斷裂模型和屈服模型.依據不同鋼材的特徵應力值的相互關繫,建議的各嚮同性鋼材的二次函數型斷裂模型和屈服模型相應地描述為主應力空間的圓柱麵、橢毬麵、拋物麵和雙麯麵.建議的各嚮同性鋼材的二次函數型斷裂模型和屈服模型較已有的彊度模型更具一般性.
기우강재단렬전필선굴복적기본사실,이강재단렬면위굴복면후계확대직지재료완정성(련속성)발생파배위가설,이이유적굴복모형적공동특정위절입점,건의료각향동성강재재주응력공간적이차함수형단렬모형화굴복모형.근거불동강재적특정응력치,양화료각향동성강재적이차함수형단렬모형화굴복모형.의거불동강재적특정응력치적상호관계,건의적각향동성강재적이차함수형단렬모형화굴복모형상응지묘술위주응력공간적원주면、타구면、포물면화쌍곡면.건의적각향동성강재적이차함수형단렬모형화굴복모형교이유적강도모형경구일반성.
Based on the fundamental fact that yield occurs prior to fracture in steel, and on the assumption that the fractured area can be accounted as the enlargement of yield surface until the integrity and the continuum of material fail, both the fracture model and yield model expressed with quadratic functions in the principal stress space are constructed for isotropic steels, in which the common features of the existing yield models are examined with great care. The proposed fracture model and yield model are quantified with characteristic stresses of steels of manifold types, which can be described using column surface, ellipsoidal surface, parabolic surface and hyperboloid in the principal stress space determined by the relations of characteristic stresses of steels. The presented models are more generalized and universalized than the existing yield models in that the latter is the special cases of the former.
