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double-notched specimen
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  “double-notched specimen”译为未确定词的双语例句
     The Critical Load of Double-Notched Specimen
     双边切口试件的极限载荷
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  相似匹配句对
     The Critical Load of Double-Notched Specimen
     双边切口试件的极限载荷
短句来源
     The Limit Load on Double-Notched Specimens
     双边切口试件的极限载荷分析
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     Research on Fatigue Crack Formation of Notched Specimen
     缺口件疲劳裂纹形成特性研究
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     DOUBLE-SPECIMEN METHOD FOR J_(IC) TSETING
     用双试样求材料的J_(IC)
短句来源
     Precise Forming Simulation of Notched Panels with Double Curvature
     双曲率开槽板精密成型有限元数值模拟
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  double-notched specimen
Strain localization phenomena were simulated with a typical double-notched specimen under tensions.
      


The slip line theory of plasticity and the theory of fracture mechanics are used to analyze the limit load on double-notched specimens under conditions of both plane stress and plane strain. Tension tests on these specimens are also carried out and formulae for calculating the limit load on double-notched tension planes are derived.

本文用塑性力学的滑移场理论和断裂力学理论,分析了平面应变和平面应力两种情形下矩形双边切口试件的极限载荷问题,同时进行了双边切口平板试件的拉伸试验,导出了平面应力条件下计算双边切口试件极限载荷的公式。文中对不同深度的双边切口试件进行了有限元计算,结果表明,该式与有限元计算值符合得很好。

Shear box test was used to conduct Mode Ⅱ fracture of rock and to determine Mode Ⅱ fracture toughness K ⅡC . Under shear box loading the formula for calculating the shear stress intensity factor K Ⅱ of double notched specimen was obtained by finite element method through displacement approach. The effects of the dimensionless notch length (2 a/W ) on K ⅡC and Mode Ⅱ fracture mechanism were studied. Test and numerical results show that under shear box loading the major principal...

Shear box test was used to conduct Mode Ⅱ fracture of rock and to determine Mode Ⅱ fracture toughness K ⅡC . Under shear box loading the formula for calculating the shear stress intensity factor K Ⅱ of double notched specimen was obtained by finite element method through displacement approach. The effects of the dimensionless notch length (2 a/W ) on K ⅡC and Mode Ⅱ fracture mechanism were studied. Test and numerical results show that under shear box loading the major principal stress σ 1 at the notch tip is smaller than the tensile strength σ t and the maximum shear stress τ max is larger than the shear strength σ c in the presence of the compressive stress. Furthermore, the maximum Mode Ⅱ stress intensity factor K Ⅱmax is 2 4 times as large as the maximum Mode Ⅰ stress intensity factor K Ⅰmax . Therefore Mode Ⅱ fracture occurs. The measured value of K ⅡC decreases with the dimensionless notch length (2 a/W ) and becomes a constant when 2 a/W ≥0.7 and B≥W in the range of α =65°~75°. K ⅡC is 2~3 times K ⅠC and can be regarded as a reliable and reasonable value of Mode Ⅱ fracture toughness of rock. Shear box test is a potential method for determining K ⅡC of rock.

采用剪切盒实验获得了岩石的Ⅱ型断裂并测定了岩石的Ⅱ型断裂韧度KⅡC ,通过有限单元法中的位移法推导出剪切盒加载下双切口试样的Ⅱ型应力强度因子KⅡ 的一般计算公式 ,并探讨了KⅡC的尺寸效应和Ⅱ型断裂机理 .实验及数值计算结果表明 :在剪切盒加载下 ,裂纹尖端最大拉应力始终低于岩石的拉伸强度 ,最大剪应力大于其对应压应力下的剪切强度 ,且Ⅱ型最大应力强度因子KⅡmax为Ⅰ型最大应力强度因子KⅠmax的 2~ 4倍 ,从而导致产生Ⅱ型断裂 ;测得的KⅡC值随无量纲切口长度 (2a W)的增加而降低 ,当 2a W≥ 0 .7,且B≥W ,α为 6 5°~ 75°时 ,KⅡC趋近于一个常数 ,该常数为Ⅰ型断裂韧度KⅠC的 2~ 3倍 ,可认为是较合理的岩石Ⅱ型断裂韧度值 ;剪切盒实验是一种测定岩石KⅡC 的行之有效的方法 .

On the basis of existing plasticity_based damage model for plasticity coupled with damage for localization analysis, constitutive parameter identification was carried out through a series of numerical tests at local level.And then improvements were made on the expressions of the evolution laws of damage. Strain localization phenomena were simulated with a typical double_notched specimen under tensions. Numerical results indicate the validity of the proposed theory.

 在已有的损伤塑性耦合本构模型基础上,进行了本构意义上的参数辨识,对不同参数取值时的材料行为进行了数值模拟,并对损伤演化律提出了改进措施· 应用改进了的模型,在结构意义上进行了数值检验,模拟了简单试件拉伸时的变形局部化· 数值结果表明这一理论模型有更好的数值稳定性,能较为准确地模拟金属韧性断裂的变形局部化现象· 

 
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