1) PTHR
正门槛值
2) threshold
[英]['θreʃhəʊld] [美]['θrɛʃhold]
门槛值
1.
An Investigation on the Relation between the Fatigue Crack Propagation Threshold and Grain Size The Application of the Dislocation Theory;
疲劳裂纹扩展门槛值与晶粒尺寸关系的研究—位错理论的应用
2.
In contrast with the threshold of fatigue cracks,a series of regulation of expanding of fatigue small cracks has been deduced.
采用对比分析方法,从疲劳裂纹的门槛值角度出发,归纳总结了疲劳裂纹的扩展规律。
3.
Near-threshold fatigue crack propagation tests were conducted under combined torsion and tension on a circumferentially pre-cracked round bar of an austenite stainless steel.
研究了带环状预裂纹的奥氏体不锈钢圆棒试样在循环扭转／拉伸复合载荷下,门槛值附近的疲劳裂纹扩展行为,分析了复合加载时不同载荷比对裂纹扩展的影响,对裂纹扩展的初始阶段进行了详细研究,用应力强度因子表征了裂纹扩展开始的门槛值,提出了椭圆方程表达的疲劳裂纹扩展开始的门槛值模型,该方程可在裂纹尖端位移准则的基础上导出,疲劳裂纹扩展停止的门槛值条件也可用椭圆方程表达。
3) threshold value
门槛值
1.
Influence of stress ratio R on threshold value △K_(th) of fatigue crack propagation for welded joints of 09CuPCrNi steel;
应力比R对09CuPCrNi钢焊接接头疲劳裂纹扩展门槛值△K_(th)的影响
2.
The results show that the threshold value △Kth of steel with 1.
８％Ｓｉ钢的门槛值△Ｋｔｈ较 ０。
3.
A new method of determinning the threshold value △Kth on a new typeAMSLER fatigue test system by computer control is given.
阐述了用新型AMSLER高频疲劳试验机，结合计算机控制测定材料门槛值△Kth的新方法。
4) lower threshold value
下门槛值
5) fracture threshold value
门槛值
1.
Based on the fracture test standard,fracture roughnessKIC,fracture threshold value Kth and crack growth rate da/dN at three different stress ratio are determined for a metallic material on the root of helicopter rotor blade.
根据断裂性能测试标准,分别测试了直升机桨叶根部材料断裂韧性K1c,3个应力比下的裂纹扩展门槛值△Kth和裂纹扩展速率da/dN;再利用多元线性回归法对试验数据进行了曲线拟合,分别得到了断裂等寿命曲线和四参数全范围da/dN曲线公式。
2.
Based on the fracture test standard,fracture roughness K_(IC),fracture threshold value ΔK_(th) and crack growth rate da/dN at three different stress ratio are determined.
根据断裂性能测试标准,分别实验测试了直升机桨叶根部材料断裂韧性K1C,3个应力比下的裂纹扩展门槛值ΔKth和裂纹扩展速率da/dt;然后,利用多元线性回归法对试验数据进行了曲线拟合,分别得到了断裂等寿命曲线和四参数全范围da/dt曲线公式的参数估计式;最后,将此公式运用于不同应力比下的裂纹扩展速率试验数据,拟合得到该材料四参数全范围da/dt曲线公式。
3.
Then the reliability method to determine fracture threshold value Δ K th is presented.
研究发现 :断裂门槛值ΔKth服从正态分
6) fatigue threshold
疲劳门槛值
1.
The fatigue threshold ofⅠ,Ⅰ+Ⅱ,Ⅰ-Ⅲmixed-mode cracks in 35CrMo steel quenched at 860℃,then tempered at 200,300,400,550,650℃respectively was studied.
研究了35CrMo钢试样在860℃淬火+不同温度回火态的复合型裂纹疲劳门槛值。
2.
According to the analysis of some theoretical models for predicting fatigue threshold of a cracked body, it is held that the tensile properties of structural steels and the stress ratio under recycle loading are main dominant factors of the fatigue threshold.
通过对各种疲劳门槛值的理论模型的分析 ,认为结构钢的拉伸性能指标和循环加载条件是裂纹体疲劳门槛值的决定因素 。
3.
The As-cast ferrite ductile iron specimens with the same chemical composition but the differ-ent graphite nodule sizes and numbers are obtained,through controlling reasonably inoculation condi-tion and cooling rate,The fatigue threshold △K_(th) and the metallographic structure near the crack are de-tected.
通过合理地控制孕育条件和冷却速度，获得了化学成分基本相同，而石墨大小、数量互异的铸态铁素体球铁试样，测定了它们的疲劳门槛值△Ｋ＿（ｔｈ）。
补充资料：正门
1.建筑物正中的主要的门。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条