In order to calculate the crack expansion life in the action of variable amplitude load for the metal bar with V-shaped notch, the formula of bar fracture frequency was obtained theoretically by setting a size of bar fracture region applied in the engineering. Based on it, the mathematic expression of crack expansion life of bar V-shapednotch tip in the action of variable amplitude load was built.

針對金屬棒料在變幅載荷作用下需要較精確地獲取其V形槽尖端裂紋擴展壽命的問題4455vs永久亚洲，通過給定一個工程上能接受的瞬斷區(qū)尺寸，獲得了棒料斷裂頻率的計算公式毛片高清无码在线，在此基礎上国产二级三级精品，建立了變幅載荷作用下棒料V形槽尖端裂紋擴展壽命的數(shù)學表達式。

With the adoption of the rate-sensitive constitutive relationship, it is asymptotically investigated the propagating tip fields of antiplane mode III crack under the condition of incompressibility, and the dynamics equations are obtained separately governing the stress and strain fields at the crack-tip.

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With the adoption of the rate-sensitive constitutive relationship, it is asymptotically investigated the propagating tip fields of plane strain mode Ⅰ,Ⅱ and antiplane mode Ⅲ crack under the condition of incompressibility, and the dynamics equations are obtained separately governing the stress and strain fields at the crack-tip.

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Take for the amount of test materials, precision that set, place beaker, unless otherwise specified, may be added 40ml of water and hydrochloric acid solution (1-2) 15ml, and then set on a magnetic stirrer, stirring allows the dissolved, together with potassium bromide 2g insert platinum - platinum electrode, it will insert the solution of the following buret tip is about 2 / 3, using sodium nitrite titration solution (0.1mol / L, or 0.05mol / L) rapid titration, side drops while stirring, to near point, Burette tip surface will be presented with a small amount of water leaching cutting-edge, lotion, and solution and continue titration slowly until the sudden deflection of galvanometer pointer, namely, titration end point.

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The constant term and non-singular terms, which are called general T-stress here, play a significant role in determining the stress and strain fields around a crack tip which in turn can affect the calculation of stress intensity factor of the crack.

裂紋尖端的奇異應力場可以表達為Williams級數(shù)展開的形式，其中常數(shù)項和非奇異項對裂紋尖端的應力應變場有著很大的影響久久国产精品一久国产精品99，這些影響反過來作用于裂紋應力強度因子的計算美女牲交一级a片免费。

Both theory and experimental results show that decrease of the band width has little effect on the faradic current at the ultramicroelectrodes, however, the non-faradic current is proportional to the area of those electrodes.

開創(chuàng)了用等離子刻蝕法制備納米金柱電極的方法，電極的最小尖端直徑可達30nm日韩,亚洲,欧美，這是目前報道的最小的電極尖端永久福利影院。詳細討論了制備條件對制備電極的影響。

Generally, electric-conductivity materials such as metal, conductive polymers, and graphite are coated on the outside surface of the capillary tip followed by the application of an external high voltage on the tip to provide a sufficient electric field to generate electrospray in seathless interface. Thus, the fabrication of the electric-conductivity material on the surface of fused-silica is one of the main issues when using sheathless interfaces.

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In this thesis, a pulled bare capillary tip was proposed to be used as the ESI emitter. The outside surface of the tip was neither coated with electric-conductivity materials nor subjected to an external high voltage. Thus, there is no concern such as short lifetime that generally observed in conventional sheathless tips.

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The main research tasks and results are as follows:(1) Through comparing the stress intensity factor of compact tension specimen calculated by finite element software with the theoretical value, the feasibility of calculating fracture parameters of crack tip in ABAQUS software was verified.(2) The relationship between the elastic modulus of the material and research scale was studied based on deriving the cohesive stress theory and other relevant theories. And the elastic modulus of the material on meso-scale was determined.(3) Global model and sub-model of the finite element were built in th...e macro-scale, and stress-strain field nearby the crack tip was analyzed, and the results show that the detailed stress-strain in the crack tip could be obtained by using the sub-model technique.(4) In meso-scale, the crack growth model was also established by assuming the crack propagating along the grain boundary, and the detailed stress-strain field in the crack tip was obtained.(5) The effect of crack length on Von Mises stress, and maximum principal stress and strain was analyzed in meso-scale when equivalent KI equals 30MPa.m1/2. And the results show that except for crack tip area, the stress-strain distribution in whole specimen is not affected.

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Blunt nose：轍叉實際尖端

actual nose of crossing 實際轍叉心, 轍叉實際尖端 | blunt nose 轍叉實際尖端 | bucket nose 桶嘴

tapering：尖端細的

taper 錐形 | tapering 尖端細的 | taperingly 尖端細地

cuspidate：尖端的

cuspidal 尖的 | cuspidate 尖端的 | cuspidated 有尖端的

taperingly：尖端細地

tapering 尖端細的 | taperingly 尖端細地 | tapestried 飾掛繡帷的

taperingly：尖端細地/漸少地

tapering /尖端細的/ | taperingly /尖端細地/漸少地/ | tapes /膠紙帶/

taperingly：尖端細地 (副)

tapering 尖端細的; 漸漸減少的 (形) | taperingly 尖端細地 (副) | tapestry 織錦, 掛毯 (名)

crack tip blunting：裂縫尖端鈍化

crack resistance 裂縫阻抗 | crack tip blunting 裂縫尖端鈍化 | crack tip closure 裂縫尖端閉合

cuspidated：有尖端的

cuspidate 尖端的 | cuspidated 有尖端的 | cuspidation 尖形飾的建筑

cuspidated：尖端的/尖頭的

cuspidate /尖端的/尖頭的/ | cuspidated /尖端的/尖頭的/ | cuspidor /痰盂/

actual point of switch rail：尖軌尖端

尖軌理論尖端 theoretical point of switch rail | 尖軌尖端 actual point of switch rail | 尖軌跟端 heel of swith rail