fatigue strength at 中文意思是什麼
fatigue strength at
解釋
n次循環時的疲勞強度-
Based on the experimental data of rotor steel 1crmov in the loading of low - cycle fatigue at high temperature, the strength behavior and the fatigue life curve of this material at 550 have been achieved. meanwhile, with respect to three kinds of notched bar, their material damage assessment method under multiaxial stress condition is discussed
本文在1crmov材料的高溫低周疲勞實驗數據進行了整理和統計的基礎上，得到了材料的疲勞強度特性曲線和疲勞壽命曲線，同時對三種不同缺口形式的圓柱形試件進行了多軸應力狀態下的材料損傷的研究，並通過數值計算方法進行了疲勞壽命評估。 -
Based on the study of strength degradation of material in the fatigue process, a strength degradation model is proposed. a stochastic differential equation, which controls strength degradation, is obtained from the model randomized by markov process. by using the theory of stochastic, the distributions of residual strength at any given lifetime and lifetime of any given residual strength are attained. under a few suitable hypotheses, inverse gaussian distribution of fatigue life is derived, and verified by means of experimental data. the result shows that the model and the method are reasonable
在研究疲勞過程中材料強度退化規律的基礎上，建立了一個強度退化模型.對其進行隨機化處理，得到控制強度退化過程的隨機微分方程.在一定假設條件下，獲得了剩餘強度概率密度函數的封閉解，並推導出疲勞壽命的反高斯分佈形式.給出一種考慮損傷狀態對隨機漲落影響的近似處理方法.與試驗數據的比較結果表明，本文的模型和方法是合理的 -
The research of high performance pavement concrete ( hppc ) is done in two sides. one is mixture design, the other is pavement performance. the mixture design and design flowchart of hppc is given on the base of nc with the consideration of characteristic of both hppc and nc. the grow law, influencing factor and formation mechanism of hppc strength is analisised by perpendicular experiment. in the same, the fatigue equations are set up for hppc and hppc i on the base of fatigue experiment. the fatigue mechanism of hppc is analysised by damage mechanics and fracture mechanics. brittleness, frost resistance and abrasion resistance of hppc is researched with the camparition to nc i. at last, the economic analysis of hppc is done by two kinds of way
結合高性能混凝土與普通路面混凝土的特點，提出了建立在普通路面混凝土基礎上的高性能路面混凝土配合比設計方法，給出了設計流程；通過正交試驗（強度試驗） ，分析了高性能路面混凝土的強度發展規律、影響因素與形成機理；同時，根據疲勞試驗結果採用雙參數weibull分佈模型分別建立了高性能路面混凝土和高性能路面混凝土（沒有摻加硅粉）疲勞方程，應用損傷力學和斷裂力學，分析了高性能路面混凝土的疲勞機理；並採用了對比分析方法，研究了高性能路面混凝土的脆性、抗凍性和耐磨性等。 -
And the finite element method ( fem ) was used to simulate the stress and deformation of the outer casing and the bearing chock. on the basis of the experiments and fem analysis, the strength and fatigue lifetime, the interaction of creep and fatigue lifetime, the creep lifetime of outer casing and bearing chock have been analyzed, at the end of trail, sem analyses of failure section has been conducted
同時對航空發動機燃氣渦輪外機匣和軸承座進行了有限元模擬計算，得到外機匣和軸承座的焊接處的強度和變形情況的模擬結果。根據試驗數據和有限元的計算結果，對發動機燃燒室外機匣和軸承座兩種結構（包含焊縫）進行靜強度分析、疲勞壽命分析、蠕變壽命分析、蠕變疲勞交互作用壽命分析以及斷口的金相分析。 -
The numerical simulation technique is used to study on the fatigue properties of submarine with high strength steel. the numerical simulation model is established and its feasibility is validated. at last, the possibility of establishing a kind of calculation and design methods of fatigue life in submarine structure is primarily analyzed
本文把疲勞裂紋閉合模型通過切片合成法引入到潛艇結構疲勞強度計算上來，建立了潛艇結構疲勞強度的數字模擬計算的數學模型，分析該方法在潛艇結構疲勞強度計算上應用的可行性，為建立一套計算和設計潛艇結構疲勞強度的方法作了初步的探討。 -
Fatigue strength coefficient decreases linearly during the cyclic course ; fatigue strength exponent increases ; fatigue ductility coefficient first goes up till the maximum value at 50 % total life, and then goes down ; fatigue ductility exponent decreases during the first half cycle till its minimum value at 50 % total life and then increases in the rest cycle course ; cycle strength coefficient and cycle strain hardening exponent both decrease during the total cycle course
結果表明： 6個基本疲勞特性參數在循環過程中都呈顯出規律性變化。疲勞強度系數呈線性減小趨勢；疲勞強度指數呈線性增大特徵；疲勞延性系數是一個先增后降的過程；而疲勞延性指數隨循環進行由初始減小到逐漸增大；循環強度系數和循環應變硬化指數在整個循環過程中都趨于減小。 -
The multi - purpose tester developed here is aim at testing the mechanics performance of the brittle material, which bases on modular design thought, it contains several modules as the machinery load component, platform of supporting, the function modules and the software system, they can be combined in different function modules to satisfies the need of different application situation. the tester can be used to measure not only general material properties such as elastic modulus, ultimate strain, strength, hardness and toughness, fatigue properties but also various special properties such as the local strength, and surface residual stress at the different location of the brittle component with non - destructive methods. thus the security and reliability of the brittle component can be evaluated and predicted
本文基於模塊化設計思想，研製了一臺專門針對脆性材料力學性能測試的多功能脆性材料試驗儀，其主要包括機械加載模塊、支撐平臺、功能模塊、測控系統、軟體系統等模塊，通過對這些模塊的不同組合可實現不同的功能及滿足不同應用場合要求;系統除了具有測試脆性材料的彈性模量、極限應變、強度、硬度、韌性等常規性能外，還具有無損測試玻璃構件不同位置的局部強度和表面預應力，進而對玻璃構件的安全可靠性和壽命進行預測等功能。 -
This paper, regarding the asphalt pavement in the zhoukou region as the study object, according to the prevalent norms ( specifications for design of highway asphalt pavement ), with the beginning of the pavement performance and the transportation investigation, totally and systematically analyzes the traffic parameters and the destroying reason of pavement at the early stage in the point of fatigue property and limit strength, gives the concepts and methods of the growth rate of equivalent axle load action time, seasonal modification factor and overload factor, proposes the method of axle load conversion on the condition of heavy loading. on this basis, it proposes the design method adapting to asphalt pavement construction, explains the steps of thickness computation of construction with the combination of engineering example, finally verifies thedesign method in the paper by test road. theory and practice both prove that the reasonability of pavement structure style and the reliability of design method in the paper can adapt to the present heavy loading and overloading traffic conditions, have highly theoretical and practical value
本文以周口地區瀝青路面為研究對象，以現行《公路瀝青路面設計規范》為依據，從路面使用性能和交通特徵的調查入手，從疲勞特性和極限強度出發分析了路面早期破損的原因，全面系統地進行了交通參數的分析，提出了當量軸次增長率、季節修正系數和超載系數的概念和方法，並提出了重載交通的軸載換算方法。在此基礎上，針對超載、重載交通從結構組合設計、結構厚度計算（包括疲勞強度標準和極限強度標準）等方面提出了適宜的瀝青路面結構設計方法，並結合工程實測，說明了結構層厚度計算的具體步驟，最後通過試驗路驗證本文提出的設計方法。理論與實踐均表明，本文提出的路面結構型式合理、設計方法可靠，能適應目前重載、超載交通的狀況，具有較高理論與實用價值。 -
Abstract : based on the study of strength degradation of material in the fatigue process, a strength degradation model is proposed. a stochastic differential equation, which controls strength degradation, is obtained from the model randomized by markov process. by using the theory of stochastic, the distributions of residual strength at any given lifetime and lifetime of any given residual strength are attained. under a few suitable hypotheses, inverse gaussian distribution of fatigue life is derived, and verified by means of experimental data. the result shows that the model and the method are reasonable
文摘:在研究疲勞過程中材料強度退化規律的基礎上，建立了一個強度退化模型.對其進行隨機化處理，得到控制強度退化過程的隨機微分方程.在一定假設條件下，獲得了剩餘強度概率密度函數的封閉解，並推導出疲勞壽命的反高斯分佈形式.給出一種考慮損傷狀態對隨機漲落影響的近似處理方法.與試驗數據的比較結果表明，本文的模型和方法是合理的 -
2, the friction coefficient at the pitch point is not a monotonic quantity of the rational speed or the load, instead of having a maximum value. and the value of the friction coefficient is very small, its order of magnitude only being 10 - 3. so, it is reasonable that the friction force on teeth surfaces are ignored when the gear - driven contact fatigue strength is designed
2 、當輪齒在節點嚙合時，隨著轉速或載荷的變化，齒面摩擦系數並非呈單調變化，而是存在極值點;節點嚙合處的齒面摩擦系數很小，其數量級為10一， ，因此在做齒輪強度設計時，忽略齒面摩擦力的影響是有理論根據的。 -
Calculation of the bending fatigue strength at the tooth root of driving gears on reduction gear drives
減速齒輪傳動中主動輪齒根彎曲疲勞的計算 -
The results show that : the strength and fatigue lifetime of the outer casing including welding line can satisfy the design requirement. although the some parts of bearing has been yielded, the strength at the weld is large enough for requirement. and welding defect, indicted by sem analyses of failure section, is main reason affecting fatigue lifetime
分析結果表明：外機匣（包含焊縫）強度和壽命滿足設計強度和壽命的要求；軸承座的強度已經進入屈服階段，而軸承座及其焊縫處的壽命卻是滿足設計壽命要求；另外斷口的金相分析表明焊接缺陷的存在是影響疲勞壽命的主要原因之一，故需提高焊接技術，減少焊接缺陷的存在以提高焊接結構的壽命。
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