fiber pull-out 中文意思是什麼
fiber pull-out
解釋
纖維拔脫-
Finally, an energy approach is combined with the fem in the simulation of the crack propagation along the fiber / matrix interface in a pull out process. the simulated results are in nice conformity with experimental results. the second part of the research deals with the characterization of the failure process in the fragmentation tests, which is one of the most frequently used test methods in studying thermal mechanical properties of fiber / matrix interfaces
在這一部分工作的最後，採用能量法與有限元法結合起來，模擬纖維抽拔試驗中裂紋的擴展:針對以往研究工作中的不足之處，在模擬中使用能量釋放率，在表徵界面破壞時，所使用的應力強度因子考慮了纖維和基體兩種材料的不同屬性，並考慮裂紋尖端的單元奇異性，來研究裂紋長度和溫度對裂紋擴展的影響。 -
Currently, the main methods used to measure the fiber / matrix interface properties of composite were based on micro - mechanics, including single - fiber composites fragmentation test ( sfc ), micro - debonding technique, single - fiber pull - out test, and single - fiber push - out test, in which sfc was most widely used
目前直接用來測定纖維增強復合材料界面力學性能的主要微觀力學方法有單纖維復合材料斷裂實驗（ sfc ） 、微脫粘方法、單纖維拔出法、單纖維頂出法，其中以單纖維復合材料斷裂實驗的應用最為廣泛。 -
These include the single fiber pull out tests, single fiber fragmentation tests, etc. however, experimental work is time consuming and its outcomes are not always repeatable, while analytical solutions are not usually available for solving such complex problems as the characterizations of the interfacial mechanical properties of fiber reinforced composites
目前在這一領域內常用的研究和分析方法有試驗、解析法以及數值解法。但試驗方法費時費力，結果的可重現性較差，而且對纖維增強復合材料的界面問題幾乎無法得到解析解。 -
Research work described in this dissertation consists of four parts : application of finite element methods ( fem ) in the study of pull out tests of single fiber reinforced composites ( sfrc ), fem study of fragmentation tests for single fiber reinforced composites, monte carlo simulation of fragmentation tests for single fiber reinforced composites, and a simulation of impact failure behaviors of fiber composites with a mesh free method - the sph method
全文論述從四個方面展開的工作：單纖維復合材料抽拔試驗的有限元數值模擬，單纖維復合材料逐節斷裂試驗的有限元數值模擬，蒙特卡羅方法模擬單纖維復合材料受拉破壞過程，無網格sph演算法在復合材料受沖擊破壞過程中的v _ （ 50 ）數值模擬。 -
Although numerical methods have frequently been used in the study of frc, theoretical analyses of such test methods as pull out tests and single fiber fragmentation tests, seemingly simple, remain to be challenging problems. problems arise when other factors are considered in connection with the various numerical models. these factors include nonlinearities in the properties and / or geometries of the materials, influences of such environmental conditions as temperature ( which is also to be studied in the present work )
本論文正是針對以往研究中的不足，在對纖維增強復合材料破壞問題進行數值模擬的研究中，綜合考慮了纖維和基體材料的非線性效應、纖維和基體材料受外載發生大變形時的幾何非線性，以及纖維基體之間界面脫粘時接觸單元的非線性效應。 -
( 1 ) systematic triaxial compression tests are made for the sand reinforced by various national geosynthetics. comprehensive investigations into the interaction characteristics are also made between sand / lime fly ash and various national geosynthetics by direct shear tests and pull out tests, which can help choosing geosynthetic type and understanding the geosynthetic reinforcement mechanism ; ( 2 ) this paper is also firstly systematically presents the results of a comprehensive investigation into the interaction characteristics between lime fly ash and various national geosynthetics ; ( 3 ) by non - linear fem, the influence of the modulus of geosynthetics, the thickness of the soft ground and the width of the foundation on the effectiveness of geosynthetic reinforcement are also studied ; ( 4 ) the main conclusions are as followed : ( geotextiles are likely to be suited for projects allowing high displacement, polyester warp knitting geogrids and oriented geogrids for projects allowing medium displacement, glass fiber geogrids for projects allowing low displacement and geonets for secondary projects. ( the confining effect of fill material to act on different kinds of geosynthetics varies largely, which must be considered
（ 1 ）本文利用三軸壓縮試驗，比較各種國產土工合成材料對砂土的加筋效果；利用直剪試驗和拉拔試驗，比較各種國產土工合成材料與砂土或石灰粉煤灰的界面摩擦特性，深入研究土工合成材料的加筋機理，首次明確提出加筋土工合成材料的選型原則； （ 2 ）本文首次系統地研究了石灰粉煤灰與各種國產土工合成材料的界面摩擦特性； （ 3 ）本文採用有限元法，系統研究了加筋模量、軟土地基厚度、基礎寬度等因素對土工合成材料加固軟土地基效果的影響； （ 4 ）本文主要結論如下： （無紡土工織物適合用於允許大變形的加筋土工程；滌綸纖維經編土工格柵和塑料拉伸土工格柵適合用於對變形有較嚴格要求的加筋土工程；玻璃纖維經編土工格柵適合用於對變形有嚴格要求的加筋工程；土工網適合用於低等級的加筋土工程。 -
In the first part of the research, fem simulations are carried out in the study of the failure process of a single fiber composite in the pull out tests
論文的第一部分是對單纖維增強復合材料的抽拔破壞過程所進行的有限元法的模擬和討論。 -
The results of numerical simulations and analytical solution show good accordance, except in the region near the fiber ends, where the shear - lag approach causes considerable discrepancy. next, to overcome the unrealistic assumption of perfect bonding, augmented - lagrange contact algorithm, element " birth - death " and fem are combined in the study of the partial debonding between fiber and matrix under pull out forces
然而完全粘結的假設過于理想，與實際應用相差較大，因此，本論文將有限元法，接觸演算法和單元生死法結合起來，研究較大抽拔力作用下，纖維與基體之間發生的逐步脫粘的過程，所得到的抽拔力的變化結果，與試驗數據比較，較為一致。 -
Fiber pull - out
纖維拔脫 -
Pull - out test of flexible macro - fiber is conducted firstly, this paper is emphasized effects of fiber embedded length, cured times and matrix strength on bonding strength between synthetic macro - fiber and mortar
本論文首次完成了柔性粗纖維的拉拔試驗，重點研究了纖維埋置長度、養護齡期、基體強度對粗合成纖維-砂漿基體界面粘結強度的影響。 -
The results of single fiber pull - out show that chemical etching on the surface can improve interface - adhesions between treated fiber and epoxy resin. the high performance ve resin has been obtained by methyl acrylic acid, epoxy e - 51 polymerization with suitable proportion. the resin properties are characterized by ftir, dma, dta, tga, sem
在ve樹脂的合成及表徵部分，研究確定了反應的最佳物料配比以及反應條件，對合成機理以及影響因素進行了探討；藉助于ftir 、 dma 、 dta 、 tga 、 sem等測試分析手段對樹脂的性能進行了表徵。 -
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 % 。
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