屈服强度

According to the statistical regression, the average acceleration response spectra of the elect earthquake records are satisfied with the standard response spectrum by new code. The result which is obtained by combining the displacement average spectra and the standard deviated spectra are satisfied with the simulate displacement response spectrum by new code. 2. Compare two different calculated methods of inelastic demand spectrum based on the factor of yield strength and equivalent damping ratios.

通过统计回归发现，地震动加速度平均反应谱能较好地拟合规范设计反应谱，而地震动位移谱平均值+1 倍标准差能较好地拟合规范拟位移谱；②对依据屈服强度系数计算弹塑性需求谱和依据等效阻尼比计算等效弹塑性需求谱的方法进行了对比。

Thermal exposured at 175 ℃ for 100 h and 500 h, the yield strength decreases by 5.5% and 14%, and the elongation decreases by 4% and 9.3%, respectively. The fact that S′(Al2CuMg) precipitates get coarsen and the precipitate-free-zones get wider are responsible for the decline of the tensile properties of 2124-T851 aluminum alloy under thermal exposure condition.

于175 ℃热暴露500 h屈服强度和伸长率就分别降低14%和9%；于热暴露条件下，2124-T851合金拉伸性能衰退的主要原因是合金固溶体基体内主要强化相S′(Al2CuMg)相粗化以及晶界无沉淀析出带的宽化。

Thermal exposured at 175℃ for 100 h and 500 h, the yield strength decreases by 5.5% and 14%, and the elongation decreases by 4% and 9.3%, respectively. The fact that S'(AI2CuMg) precipitates get coarsen and the precipitate-free-zones get wider are responsible for the decline of the tensile properties of 2124-T851 aluminum alloy under thermal exposure condition.

于175℃热暴露500h屈服强度和伸长率就分别降低14%和9%；于热暴露条件下，2124-T851合金拉伸性能衰退的主要原因是合金固溶体基体内主要强化相S'(Al2CuMg)相粗化以及晶界无沉淀析出带的宽化。

The analysis results show that the stability of long span curve continuous rigid frame is actually the ultimate load carry capacity considering the yield strength of material and the effect of the geometric nonlinear effect to structure can not be ignored.

结果表明：弯连续刚构桥梁的稳定问题已经转化为考虑结构材料屈服强度的极限承载力问题，同时几何非线性对稳定的影响亦不能忽略。

The increase of yield strength of IA alloy uprises to 13-17 kgf/mm~2, or the relative increment of 20-25%, provided by furnace cooling instead of air cooling.

如IA合金屈服强度提高13-17kgf/mm~2，相对强度提高20-25％，且有改变晶界状态消除缺口敏感的作用。

The results show that the stress of clack box is lower than the yield limit of the material. The safety factor is between 1.8 and 3.2, and the distortion of clack box is in the permission scope. The static strength and stiffness satisfy the request, and the life of clack box exceeds 107, which meets the requirements.

研究结果表明，在3种载荷工况作用下阀箱应力均低于材料的屈服强度，其安全系数为1.8~3.2，且阀箱的变形在允许范围之内，阀箱静强度及刚度满足要求；阀箱疲劳寿命大于107，也满足要求。

The results show that, the coefficients of welded joints are both greater than 0.9, but the yield strength of weld joint filled with Al-Mg-Zr-Sc welding wire is greater 100 MPa than that of filled with Al-Mg-Zr welding wire. It indicates that the Al-Mg-Zr-Sc welding wire is the best alteration of filling materials to weld of Al-Mg-Sc alloy.

但采用Al-Mg-Zr-Sc合金焊丝为填充材料时，焊缝晶粒组织明显细化，熔合区形成的细小等轴晶层提高了基材与焊缝填充材料的结合力，焊接接头的屈服强度比采用Al-Mg-Zr合金焊丝为填充材料时提高了100 MPa，显著提高了Al-Mg-Sc合金焊接构件的许用强度，因此焊接Al-Mg-Sc板材更宜采用Al-Mg-Sc-Zr焊丝。

Numerical simulations of welding transient stress and residual stress with yield strength and thermal expansion coefficient mismatching between the weld metal and the parent metal have been carried out for the first time.

相同焊接温度场的有限元计算结果表明，焊缝与母材强度和线膨胀系数等匹配时，焊缝中心纵向残余应力σ〓与母材屈服强度σ〓和线膨胀系数α〓有关。

The tensile yield strength of 2900 psi, flexural modulus (1% cut) of 117000 psi, at -40 ℃ condition, 0.25 inches of ARM notched specimens for impact strength 180 ft-lb.

拉伸屈服强度为2900 psi，弯曲模量（ 1%切割）达到117000 psi，在-40℃条件下，0.25英寸缺口试样的ARM冲击强度为180 ft-lb。

The bending modulus for the 142000 psi, tensile yield strength of 3400 psi, 0.25 inch notched specimens for the ARM impact strength 180 ft-lb.

其弯曲模量为142000 psi，拉伸屈服强度达3400 psi，0.25英寸缺口试样的ARM冲击强度为180 ft-lb。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。