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j parameter
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  j参量
     EXPERIMENTAL MEASUREMENT OF J PARAMETER AND δ1 ON SPECIAL SHAPE PLATES WITH HIGH STRAIN GRADIENT
     高应变梯度异形板J参量和δ_t的实验测定
短句来源
     J parameter curves and,therefore,the formula for evaluatingJ have been obtained by means of the multiple specimen techniqne.
     采用多试件法标定出J参量曲线,并进一步通过计算机进行分析处理,求得了J参量计算公式。
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  “j parameter”译为未确定词的双语例句
     Three methods of estimating discrimination of Yunnan maize regional trial sites for the best genotypes, i.e., the method of variation coefficient,regression coefficient and the D_j parameter of AMMI model,were compared in detail. The results showed that regression coefficient was not efficient, the conclusions of another two methods were almost the same in general. But the method of AMMI model was comparatively precise.
     用变异系数法、回归系数法和AMMI模型Dj值法对云南玉米区域试验点区辨力进行了比较研究,结果表明:回归系数法不很有效,变异系数法和AMMI模型法的结论大体相近,但AMMI模型Dj值法相对更准确。
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  相似匹配句对
     estimation of its parameter;
     评定运动模糊的参数;
短句来源
     n—Parameter CAPM
     n个参数的资本性资产定价模型
短句来源
     Traverse Parameter Adjustment
     导线间接平差法
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     METHOD OF PARAMETER CONSTRAINT ADJUSTMENT
     参数约束平差法
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  j parameter
The effect of the location convenience enters into the j parameter and forces us to adopt a matrix notation to solve for the markup.
      
This can be done directly using the j parameter in the SVM-light implementation.
      
Much more important, the J parameter is noticeably reduced due to correlation included.
      
An additional study was performed in order to estimate an J parameter and a standard deviation of the estimate.
      


This paper presents a high strain gradient special shape platewith a hole which can simulate better nozzle strain fields and hasthe mechanism and characteristics similar to those of nozzle cornercracks.J parameter curves and,therefore,the formula for evaluatingJ have been obtained by means of the multiple specimen techniqne.The CTOD δ_t of He three kinds of definitions were measured witha microphotography technique.Thus the relationship between J andδ_t has been detrmined.The results are exterded...

This paper presents a high strain gradient special shape platewith a hole which can simulate better nozzle strain fields and hasthe mechanism and characteristics similar to those of nozzle cornercracks.J parameter curves and,therefore,the formula for evaluatingJ have been obtained by means of the multiple specimen techniqne.The CTOD δ_t of He three kinds of definitions were measured witha microphotography technique.Thus the relationship between J andδ_t has been detrmined.The results are exterded to the nozzle cornercracks.Finally the suitability of the defect assessment methods ofengineering now widely used in the word and the problem of Jcontrolling crack extension are also discussed.

本文提出了一种带孔高应变梯度异形试板,试验结果表明,该试板能较好地模拟压力容器按管区应变场,具有类似于接管拐角裂纹的断裂机理及特征。采用多试件法标定出J参量曲线,并进一步通过计算机进行分析处理,求得了J参量计算公式。用显微摄影法求得了三种定义下的CTOD δ_1线,进而求得了关系式J=mσ_yδ_t及m的变化规律。还将试验结果推广到容器接管拐角裂纹问题,讨论了接管断裂安全工程评定及J参量控制裂纹扩展问题。

On the special shape plates of 16 MnR steel simulating the strain fields of pressure vessel nozzle region, elasticplastic fracture J parameter and CTOD δt curves in the high strain gradient fields were measured by means of the multiple specimen technique and the micro photography technique respectively. The evaluating formula of J and the relationship between J and δt had been obtained with computer multiregression and parametric analysis. A new way had been opened up for the close combination...

On the special shape plates of 16 MnR steel simulating the strain fields of pressure vessel nozzle region, elasticplastic fracture J parameter and CTOD δt curves in the high strain gradient fields were measured by means of the multiple specimen technique and the micro photography technique respectively. The evaluating formula of J and the relationship between J and δt had been obtained with computer multiregression and parametric analysis. A new way had been opened up for the close combination between the experimental study of small specimen and that of practical nozzle structures.

在能较好模拟压力容器接管区应变场的16MnR异形板上,采用多试样法和显微摄影法测定出高应变梯度区弹-塑性断裂J参量和CTON δ_t曲线,并通过多重回归和参数分析求出了J参量估算式和关系式J=mσ_yδ_t,为将小试样与实物容器接管结构试验研究紧密相联开拓出一条较新的途径。

Abstract An investigation made on the short crack propagational behaviours of 2.25 Cr 1Mo steel tested both in air and hydrogen obtained from cathodic polarization indicates that under the effect of hydrogen, Δ J th is approximately 360×10 -6 MN/m, and about 200×10 -6 MN/m lower than that obtained in air. The relationship between crack propagation rate da/d N and Δ J parameter in hydrogen moves to leftside to different extents with different Δ J range. Fracture...

Abstract An investigation made on the short crack propagational behaviours of 2.25 Cr 1Mo steel tested both in air and hydrogen obtained from cathodic polarization indicates that under the effect of hydrogen, Δ J th is approximately 360×10 -6 MN/m, and about 200×10 -6 MN/m lower than that obtained in air. The relationship between crack propagation rate da/d N and Δ J parameter in hydrogen moves to leftside to different extents with different Δ J range. Fracture analysis reveals different combination effects between hydrogen and applied force with different Δ J ranges. Not much influence, however, has been found in a specific Δ J range between ≈1000×10 -6 MN/m and ≈1200×10 -6 MN/m. It seems to be due to stress releasing after transcrystalline propagation resulting from hydrogen built up in a local grain boundary, which causes excess stress concentration.

通过对在空气中与阴极渗氢情况下2.25Cr-1Mo钢的短裂纹扩展研究,发现在氢的作用下,ΔJth约为360×10-6MN/m,较空气中约低200×10-6MN/m,da/dN-ΔJ关系与空气中相比左移,且随ΔJ区间不同,左移量不也不同。断口分析表明,在疲劳裂纹扩展的三个阶段,氢原子与交变力动态地起着协同作用。在≈1000×10-6MN/m<ΔJ<≈1200×10-6MN/m内氢原子对裂纹扩展影响不明显可解释为:氢原子在局部晶界的偏聚导致应力过分集中而产生穿晶裂纹后应力缓解的结果。

 
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