natural stress state 中文意思是什麼
natural stress state
解釋
天然應力狀態-
In this paper, the finite - element numerical analysis calculation is applied to the foundation of high - rise and multi - floor building and the evolvement law of stress and displacement of tunnel used by urban traffic to explore the mutual influence between the wall rock of underground space and high - rise building foundation, taking account of the specific construction situation in the " sanmu garden " project in dadukou district in chongqing, from the perspective of underground space static - force structure stability analysis to open a underground tunnel with 6m in span and 7. 5m in height for track traffic 20m below the surface. this paper, taking considerations of three different states, i. e. the natural state without any artificial interference, the state of high - rise buildings on the surface, and the underground tunnel state with excavation for track traffic, and four plane lines and four vertical lines, analyzes and studies the distributing law of stress and displacement of calculation section from the following aspects : ( 1 ) the main stress vectorgraph, displacement distribution graph ( ux, uy ) and chromatogram graph of stress isoline ( 1, 2, xy ) of section under different states ; ( 2 ) the contrastive distribution curve of stress ( 1, 2, xy ) of different plane and vertical lines under the same state ; ( 3 ) the contrastive distribution curve of stress ( 1, 2, xy ) of the same plane and vertical lines under different states, wishing to provide references for underground space utilization and project designing and construction of the tunnel under high - rise buildings in the future
本文結合重慶市大渡口區「三木花園」開發建設項目，從地下空間靜力結構穩定性分析角度出發，針對在該項目中涉及的高層和多層建築物以及在其地下20米處開挖了一個用於軌道交通的跨度6米，高7 . 5米的地下隧道這一具體工程情況，採用2d - 3d -有限元結構分析程序對高層與多層建築物的地基基礎及其與城市軌道交通使用的地下隧道圍巖的應力與位移演變規律進行了有限元數值分析計算，探索了地下空間圍巖與高層或多層建築物地基基礎之間的相互影響，通過考慮未受到任何人為擾動影響的天然狀態、地表存在多層或高層建築物狀態和地下開挖用於軌道交通的地下隧道狀態等三種不同狀態以及4個水平剖線和4個垂直剖線等不同情況，從以下幾個方面具體分析研究了計算斷面的應力與位移分佈規律： （ 1 ）在各種不同狀態下計算斷面的主應力矢量圖、位移分布圖（ ux 、 uy ）以及應力等值線色譜圖（ _ 1 、 _ 2 、 _ （ xy ） ）等； （ 2 ）相同狀態下不同水平與垂直剖線的應力_ 1 、 _ 2和_ （ xy ）對比分佈曲線； （ 3 ）不同狀態下相同水平或垂直剖線的應力_ 1 、 _ 2和_ （ xy ）的對比分佈曲線等，為今後在對地下空間的開發利用以及在高層建築物地下開挖硐室時的工程設計和工程施工提供參考依據。 -
Steady state thermal analysis under natural convection boundary condition was performed. both the temperature distribution and the induced mechanical stress were calculated in this simulation. high stress area was found and the potential reasons which can cause packaging to fail were also discussed
具體內容包括: 1 .建立一款疊層csp / bga封裝的三維實體有限元模型，求解自然對流條件下的穩態溫度場分佈，並在此基礎上進行穩態熱應力和熱應變分析，找出由於溫度梯度在封裝內部引起的高熱應力區域，分析其可能造成的失效結果。 -
In first part of the thesis, by a review of the research on aircraft sonic fatigue, the formulas for calculating natural frequencies of the typical aircraft skin - panel structure with four edges simply - supported or four edges fixed - supported were drawn, the response of displacement and stress was analysed under the condition of random white noise loading with the steady - state or unsteady - state. the procedure how to use data of s - n curve under constant loading for predicating the fatigue life of skin - panel subjected to random loading was shown
通過對聲疲勞問題研究的回顧，根據典型飛機蒙皮壁板模型，整理了四邊固支，四邊簡支兩種邊界條件下多階模態固有頻率，非平穩及平穩隨機白噪聲載荷下的位移和應力響應，以及如何從等幅s ? n曲線求得隨機載荷應力下的疲勞壽命。 -
In order to prolong the natural life of fracturing pump valve, this article do much basic research work on fracturing pump value. firstly, kinetic characteristics of fracturing pump valve are stated particularly and analysed. through stimulated experiment based on practical working conditions, the wearing disciplinarian and forms of impact particle wear about fracturing pump valve are researched by comparing it with pure impact wear and abrasive wear. furthermore, the wear mechanism of impact particle wear and particle erosion are analysed. in the end, by using the fenite element analyzing tool ansys, the distributing law of stress and strain of fracturing pump valve at the state of closing and during the process of impact are analysed carefully
詳細闡述和分析了它的運動特性；根據其實際工況，通過模擬試驗，研究了壓裂泵閥沖擊磨料磨損的磨損規律和磨損形式，並且將其與純沖擊磨損、滑動磨料磨損進行了對比；分析了壓裂泵閥的沖擊磨料磨損、沖蝕磨損等磨損機理；藉助ansys有限元分析工具，對泵閥關閉狀態下和沖擊過程中的應力應變分佈規律進行了詳細分析。
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