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)
2014年
3期
93-96
,共4页
RHT模型%失效强度参数%当前面表达式%SHPB%冲击动态
RHT模型%失效彊度參數%噹前麵錶達式%SHPB%遲擊動態
RHT모형%실효강도삼수%당전면표체식%SHPB%충격동태
RHT constitutive model%parameter of the failure surface%expression of current face%SHPB%dynamic impact
RHT模型普遍用于混凝土的数值模拟当中，但该模型的相关参数较难获得。利用SHPB实验测得C40混凝土应力应变曲线，并从该曲线中选取RHT模型中弹性极限面和失效强度面对应的应力状态点进行数值拟合，从而得到RHT模型参数A、N、δ、α。并引进当前面所对应的归一化静水压参量和应变增量，改进了损伤量D的描述，从而改进了在混凝土数值计算中广泛应用的RHT 模型。结果表明：改进 RHT 模型得到的理论应力应变曲线与实验曲线吻合良好，可作为获得RHT模型参数的有效方法。
RHT模型普遍用于混凝土的數值模擬噹中，但該模型的相關參數較難穫得。利用SHPB實驗測得C40混凝土應力應變麯線，併從該麯線中選取RHT模型中彈性極限麵和失效彊度麵對應的應力狀態點進行數值擬閤，從而得到RHT模型參數A、N、δ、α。併引進噹前麵所對應的歸一化靜水壓參量和應變增量，改進瞭損傷量D的描述，從而改進瞭在混凝土數值計算中廣汎應用的RHT 模型。結果錶明：改進 RHT 模型得到的理論應力應變麯線與實驗麯線吻閤良好，可作為穫得RHT模型參數的有效方法。
RHT모형보편용우혼응토적수치모의당중，단해모형적상관삼수교난획득。이용SHPB실험측득C40혼응토응력응변곡선，병종해곡선중선취RHT모형중탄성겁한면화실효강도면대응적응력상태점진행수치의합，종이득도RHT모형삼수A、N、δ、α。병인진당전면소대응적귀일화정수압삼량화응변증량，개진료손상량D적묘술，종이개진료재혼응토수치계산중엄범응용적RHT 모형。결과표명：개진 RHT 모형득도적이론응력응변곡선여실험곡선문합량호，가작위획득RHT모형삼수적유효방법。
The RHT model is widely employed in the numerical simulation of concrete, but its associated parameters are hard to obtain. The stress-strain curves of C40 concrete are obtained by taking advantage of SHPB, and the special arguments of the stress-strain curves for the given material corresponding to the elastic limit surface and failure surface are used in numerical fitting, and finally the parameters of RHT model A, N,δandαare obtained. The normalization pressure P* of the strength between failure surface and residual strength surface, as well as the increment of strain are introduced to improve the description of the damage D. Consequently, the RHT model is further improved. The theoretic stress-strain curves of improved RHT model are in good agreement with experimental ones. The proposed method proves to be an efficient way to obtain the parameters of RHT model.
