first principal stress 中文意思是什麼
first principal stress
解釋
第一主應力-
Presents the investigation of the heat conduction behavior, internal thermal stress field of specimen under thermal shock and microscopic damage and failure of the tungsten based composites by combination of macroscopic and microscopic analyses and integration of material science and mechanics ; describes a microscopic mechanical model based on the microstructure of components with macroscopic stress applied to the microscopic model as that of maximum principal stress at the center, and the fringe of the specimen, and the microscopic stress fields obtained through calculation by the finite element method, and concludes from test results that the maximum principal stress is first generated inside the test coupon, and a failure will be first initiated in the inclusion if the material fails at this time ; the maximum principal stress moves to the edge of the test coupon after the test coupon is heated for a period of time, and the failure will first be initiated in the base if the material fails at this time
從材料設計的思想出發，採用宏觀與微觀、材料科學與力學相結合的方法，對鎢基復合材料的熱傳導行為、材料在熱沖擊載荷下的內部熱應力場及材料細觀結構的破壞行為進行了詳細的理論研究.根據鎢基復合材料的細觀組織結構建立了材料細觀模型.在宏觀分析的基礎上，分析了材料微結構內部的破壞行為.分別取試件心部與邊緣主應力值最大點的應力狀態，施加在所建立的模型上，用有限元方法計算了模型內部的彈性應力場.結果表明：試件主應力最大值首先產生在試件內部，此時，如果材料發生破壞將先從夾雜中開始；加熱一段時間后試件中的最大主應力值轉移到試件邊緣，此時材料發生破壞將先從基體中開始 -
Research shows that four factors have great influence on the formation of complex rock mass. first, rock mass subjected six times of tectonic movement during long period of geo - history, each tectonic movement produced fractures and associated joints corresponding to the orientation of maximum principal stress and deteriorated the properties of fractures formed at former period ( s ). second, down - cutting of langcangjiang river produced unloading fractures
採用了四種巖體質量分級評價方案對研究區巖體質量進行了研究，這四種方案包括：工程巖體分級標準（ gb50218 - 94 ） 、水利水電圍巖工程地質分類（ gb50267 ? 99 ） 、巖體rmr分類（ bieniawski ， 1973 ） 、巖體質量指數z分級（小灣， 1995 ） 。 -
The steady of grottoes attacked by earthquake is analyzed with the engineering soft named adina, in order to show where the weak parts of grottoes are and time - history curves of the horizontal displacement of the easily damaged nodes and time - history curves of first and third principal stress of the easily damaged elements
（ 3 ）以大型adina有限元分析軟體為基礎，編制了預應力錨索材料的非線性有限元計算程序模塊，研究石窟在地震作用下的穩定性問題。選取能代表石窟整體結構的三個不同剖面作為有限元計算模型，並採用不同工程特性的地震動加速度時程作為荷載輸入。
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