primary crack 中文意思是什麼
primary crack
解釋
主要裂縫-
And it investigates the appearance condition ( including joint, crack, eroding, corrosion, braking pole device rupture, crane - girder ' s gnawing railway and so on ) of the whole crane - girder system on the spot, at the same time, it also actually examines the stress of the beam, chemical ingredient, distortion and railway excursion, etc. through sampling, and based on the actually examined results, it checks and calculates the carrying capacity of crane - girder system. then, based on the investigating on the spot and the calculated result, it discusses the mechanism of fatigue failure of the upper part of welded steel crane - girder, analyses the reason of steel crane - girder in the high - frequency emerging the fatigue crack, institutes the strengthened method of damaged steel crane - girder of accurate packing up workshop of the primary mill plant. finally, it presents some advice and suggestions for the repairing and strengthening method of fatigue crack of upper part of steel crane - girder in the high - frequency
針對包鋼初軋廠精整車間鋼吊車樑上部區域出現裂縫這一問題，本文首先綜述了國內外關于焊接鋼吊車樑上部區域疲勞裂縫的研究現狀；其次對整個吊車梁系統的外觀情況（包括連接、裂縫、腐蝕、銹蝕、制動桿件斷裂、吊車啃軌等）進行了現場調查，抽樣實測了梁的應力、化學成分、變形及軌道偏移等，根據實測結果，對吊車梁系統的承載能力進行了驗算；然後，根據現場調查及計算結果，探討了焊接鋼吊車樑上部區域疲勞破壞的機理，分析了重級工作制鋼吊車梁出現疲勞裂縫的原因，制定了初軋廠精整車間破損鋼吊車梁的加固方案；最後就重級工作制鋼吊車樑上部區域出現疲勞裂縫的修復與加固方案提出了一些意見和建議。 -
All of these reservoirs have bad physical property with lower porosity and lower permeability. mainly reservoir paces is cracks ( structure crack, diagenetic crack ), the following is primary intergranular pores, primary intragranular pores, intergranular solution pores, intergranular solution pores, intercrystaline pores and so on. this layer was in later diagenetic a stage
這些儲集體的物性都很差，為低孔、低滲儲層，其儲集空間主要為裂縫（構造縫、成巖縫等） ，其次為原生粒間孔、溶蝕粒間孔、原生粒內孔、溶蝕粒內孔和晶間孔等。 -
3. the two stages of primary creep and steady - state creep of 3d c / sic correspond to the gradual saturation of matrix crack and the opening of these cracks respectively. the transverse crack is the main contributor to the macroscopic creep strain of 3d c / sic, and its opening is controlled by the creep temperature
（ 3 ） 3dc sic復合材料的減速蠕變階段和穩態蠕變階段分別對應著基體裂紋趨于飽和和逐漸張開這兩個過程；橫向基體裂紋是3dc sic復合材料宏觀蠕變應變的主要貢獻者，溫度是影響橫向裂紋張開速度的一個重要因素。 -
The critical crack and stress put forward provides theoretic foundation for monitoring portal machine. 3. applying steady theory of board, studying the problem of early curvature, flexibility model, welding remaining stress, elastic transmutation and brace condition and so on, conclude that structure of beam is primary place where metal structure of portal crane lose stabilization and the break of main beam is result of losing partial stabilization of main board
文章提出的界限應力和臨界裂紋對于港口機械的監測提供了理論依據； 3 、運用板的穩定理論，探索了作為薄壁構件的門機金屬結構在失穩破壞中所涉及到的初曲率問題、彈性模量問題、焊接殘余應力問題、彈塑性變形問題以及支承條件問題等，得出了門機金屬結構發生失穩破壞的主要部位為臂架結構，且主臂架的折斷是由於受壓翼板局部失穩引起整體破壞； 4 、探討了焊接對結構承載的影響。 -
A way to avoiding crack or reducing crack width of concrete or reducing distortion of member is using prestressed concrete. the writer tried to make full use of the merit of the prestressed concrete and designed prestressed concrete mandril to control crack of structure. the prestressed concrete mandril, which was firstly applied high pressure on a small concrete bar, and then was made in concrete, so it would act as reinforced bar and resist load. in this thesis the writer designed 24 mmnbers and had experimental study of them, reached the conclusion that the effect of resisting crack of the prestressed concrete mandril was good when the load was not large, it can enhance the capacity of resisting crack and reduce the crack distance and crack width, but when the loads was large, the effect of resisting crack was not good, when we used the prestressed concrete mandril and reinforced bar together in member, the effect of resisting crack was very good. the writer analysed the adherence mechanism and wreck mechanism of the prestressed concrete mandril in anxial tension members, and according to the character of the prestressed concrete mandril, the writer constructed the bond model of it. then the writer introduced the analysis theory of crack including the bond - slip theory, the non - slip theory, the synthesis theory and mathematics stat method. the different theory had different theory base, they considered that the primary affection of crack width was different. in this test, the crack distance and crack width of members which placed reinforced bar were match to the compute value of the code gb 50010 - 2002 very well. to the members which
本文共進行了24根試件的試驗研究，得出了預應力混凝土芯棒能較大地提高構件抗裂承載力，在荷載小於預應力混凝土芯棒的開裂荷載時有較好的抗裂效果，能較大地減小裂縫間距和裂縫寬度，但是當荷載較大預應力混凝土芯棒開裂時預應力混凝土芯棒的抗裂效果不是很好，若將普通鋼筋和預應力混凝土芯棒一起使用時則有很好的抗裂效果。本文分析了預應力混凝土芯棒在軸拉試件中的粘結機理和破壞機理，根據預應力混凝土芯棒本身的特點，提出了預應力混凝土芯棒與后澆混凝土之間的粘結模型。然後本文詳細介紹了經典的裂縫分析理論粘結滑移理論、無滑移理論、綜合理論和數理統計方法，各理論有著各自不同的理論基礎，認為影響裂縫寬度的主要影響因素也各不相同。 -
In order to accelerate the development of preflex composite beam in railway bridges and to design and construct preflex composite beam bridges of railway in our country reasonably, this thesis is from the scientific project of railway department " experiment and application research of railway preflex composite beam " and summarizes the design information and practical projects on preflex composite beam. on the basis of above works, this thesis improves computation method in analysis of railway preflex composite beam on sectional stress, deflection of mid - span, crack width and shearing resistance and programs a software " preflex composite beam bridge structure analysis system - pfsas ", which is adapt to railway bridges in our country. moreover it makes a primary research in construction techniques and structure measures
為了迅速促進預彎組合梁在我國鐵路橋梁中的發展，合理地進行我國鐵路預彎組合梁橋的設計和施工，本文結合鐵道部科技研究開發項目「鐵路預彎組合梁的實驗與應用研究」 ，在總結以往對預彎組合梁力學性能研究成果及實際工程的基礎上，完善了鐵路預彎組合梁的截面應力、跨中撓度、裂縫寬度和抗剪分析的計算方法；編制了適用於我國鐵路橋梁的「預彎組合梁橋結構分析系統? ? pfsas 」軟體；並對預彎組合梁的施工工藝及構造措施進行了初步探索。 -
The results show that, when the hardfacing process is not appropriate, the thick martensite structure with high carbon content will form in the overheat region of heat affected zone, and the high residual stress occurred, which are the primary causes resulting in crack
結果表明，堆焊工藝制定不當，熱影響區的過熱區形成高碳粗大馬氏體組織及保留了較大的焊接應力，是導致堆焊層開裂的主要原因。 -
For successfully applying ae on detecting crack during fatigue test, noise restraining, signal locating and the building of ae features database has been deeply investigated in this thesis. in brief, the following are the primary contents : by analyzing the source of noise, several methods of restraining the noise are proposed : space filter, amplitude filter, bp filter, parameters filter, hit time setting and illustrate analysis
本文基於將聲發射技術應用到直升機部件疲勞裂紋檢測中，對噪聲的抑制、聲發射源定位的問題以及聲發射特性典型參數數據庫的構造進行了研究，主要工作如下： ?分析噪聲的來源，對如何抑制環境噪聲進行了研究。 -
The result shows that, when expansion agent is added, shrinkage can he compensated at some extent and crack can be restrained or reduced effectie1y and then the concrete ageing resistance can he enhanced, and under experiment condition, the appropriate mix content of the expansion agent should be less than 6 %, finally, for compensation shrinkage concrete, the restrictive expansion rete should he the primary index
結果表明，加入膨脹劑能補償部分收縮，有效抑制或減少裂縫的產生，提高混凝土的耐久性；試驗條件下試驗所用膨脹劑的適宜摻量應小於6 % ；對補償收縮混凝土，其限制膨脹率應作為第一性指標。 -
At the same time, the energy absorbed in the crack propagation phase decreases relatively that lead to overall energy absorption of the composites increases slightly, it is greater than 12. 89 %. by observing the appearance of the damage area, it can be found that the mode of damage is influenced by the interfacial shear strength. if the interfacial shear strength is low, fiber pull - out is the primary energy - absorbing mechanisms, whereas the dominant energy - absorbing mechanisms changes into fiber / matrix debonding and delamination when the interfacial shear strength is stronger
界面剪切強度增加后，材料的沖擊極限載荷有所增加，在裂紋起始區吸收的引發能增加較多，其中增強纖維經等離子體處理6分鐘的試樣所吸收的引發能增加了18 . 57 % ;由於裂紋擴展階段所吸收的能量相對有所下降，材料總的能量吸收能力雖有所改善，但增加不多，其中界面剪切強度增加最多的試樣，吸收的總能量增加了12 . 89 % 。 -
According to the test results of 15 large size specimens of sfrc four - pile caps, crack status, the midpoint flexibility of pile caps bottom, concrete strain side and steel strain bottom are observed, and primary influencing factors of sfrc four - pile caps are analyzed by changing bulk factor, effective thickness, quantity of distributed steel and steel laying mode
依據15個大尺度鋼纖維混凝土四樁承臺試件的試驗情況，通過改變鋼纖維體積率、承臺有效厚度、配筋量及配筋方式，觀察和記錄了樁承臺裂縫開展與分佈、承臺底部中點撓度、側邊混凝土應變和底部受拉鋼筋應變，分析了影響鋼纖維混凝土四樁承臺承載能力的主要參量。 -
Abstract : according to the test results of 15 large size specimens of sfrc four - pile caps, crack status, the midpoint flexibility of pile caps bottom, concrete strain side and steel strain bottom are observed, and primary influencing factors of sfrc four - pile caps are analyzed by changing bulk factor, effective thickness, quantity of distributed steel and steel laying mode
文摘:依據15個大尺度鋼纖維混凝土四樁承臺試件的試驗情況，通過改變鋼纖維體積率、承臺有效厚度、配筋量及配筋方式，觀察和記錄了樁承臺裂縫開展與分佈、承臺底部中點撓度、側邊混凝土應變和底部受拉鋼筋應變，分析了影響鋼纖維混凝土四樁承臺承載能力的主要參量。 -
In the practice application, the project ? the large dam secure supervising and measuring system of taipu brake, which the penman participated himself, is introduced in detail, which includes the system synopsis, the definition of the pressure, the crack, the horizontal displacement and the vertical displacement, the compare of diversified measuring methods, the choice of the instruments and the configuration of the instruments, the system network topology configuration, the collocation of various metrical dots and instruments " demarcating and testing, the system software and the application software, the communications between the intelligent instruments and the primary interfaces of actual system
在實踐應用方面，詳細介紹了筆者親自參與實施的工程? ?太浦閘大壩安全監測系統，包括系統簡介，揚壓力、裂縫、水平位移和垂直位移的定義，各種測量方法的比較，儀器的選型以及儀器的結構，系統的網路拓撲結構，各測點的布置以及儀器的標定測試，系統軟體和應用軟體，智能儀器與上位機的通信，實際系統的主要界面。為了論文的完整性，介紹了大壩安全監測專家系統。
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