This article that focuses on the systematic and in-depth research in the current primal problem about abnormal burst pressure reservoir depress burst pressure has procured following main fruits:1 It forms the method which could obtain massive vertical static state mechanics parameters.2 In a foundation of acquisition of rock mechanics parameters,apply bent lamella that as mechanical model along with characteristic of actual geologic characteristics to analysis curvature for anticlinal strcture, get homologous tectonic stress value throug relation between the curvature and stress and different principal curvature in anticlinal structure,consequently set up laminational stress model for anticline reservoir. The block lamination for existed fracturing date has formed method of setting up mechanical model of lamination terrestrial stress by abtaining the block tectonic stress coefficients which are got by complex utilization test, laboratory test and fracturing date playback.3 Analysesing the main reason which lead to high burst pressure by considering the characteristic of reservoir geology,reservoir,and rock mechanics and reservoir damage,etc.Establishing burst pressure quantitative prediction model which provide gist for depressing construction risk and optimizing construction craft under the condition of open hole completion ,gun-perforated completion and damaged reservoir.4 Provding theoretical basis for interpreting acidification pretreatment which could depress busrt pressure by finding the relation between the influencing factors and rock machanics parameters and analysing the factors that have effect on rock mechanics parameters. Expounding the mechanism of reaction of mixed monomineral and acid from the angle of microcosmic element, evaluating quantitatively acid sensilility of different kinds of mineral effectively, and determing the first-order reaction dynamical equation of each mineral.5 Revealing rock mechanics property chage as a result of acid flooding in different condition by sandstone traumata experiment in different temperatures which combined with rock mechanics triaxial stress experiment.6 Associating damage mechanics with sandstone acidizing, established sandstone damage mechanics model in the foundation of the recognition on the rock mechanics parametric variation which is caused by acid-rock reaction in both macroscopic view and microscopic view ,also demonstrated those processes and quantitative estimated the acid busrt pressure to direct the site operation.

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First of all,we tested the germination and water uptake rate of 47 species typical xerophil seeds grow up in north China from 20 families,38 genuses under sufficient water and different Grads water stress by high-molecular-weight polyethylene glycol(PEG6000).The results show that Xerophil seeds from the same habitat exhibited similar patterns in response to water stress.Xerophil seeds from arid community were stronger in germination and imbibition than that from other two communities under serious water stress,whereas Xerophil seeds from humid community were sensitive to any degree of water stress.Namely,the seeds live in arid habitat possessed high germination and quickly water uptake in sufficient water or any degree of water stress,but the others grow up in humid habitat shown significant difference which germination and water uptake well under sufficient water but inhibited even if slight water stress.

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Using FEM, the coupled action of thermal stress and crustal stress has been taken into account. The regularities of distribution of the horizontal displacement of surface of slope and the shear stress of junction plane between shotcrete and rock are discussed too. According to the analysis, under the combined action of thermal stress and crustal stress, top and foot of slope are liable to be destructed. Ordinary, the destructional form of the top is tensile failure and the bottom is shear failure. There are some time effect of displacement and stress in the surface of slope and distribution of temperature in slope, which agrees with actual measured rules.

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The results show that the influences of duration and amplitude of stress wave on spallation process of rock under stress wave loading are important; and stress wave with different waveforms is characteristic of different stress values and different stress loading ratios during the same period of time, which brings about the comprehensive effect when difform stress wave is loaded to medium.

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Incurrent research, aiming at the rupture problem engendered in the shooting process of acertain 5.56mm automatic rifle, the strain and stress distributions on the cartridge caseunder the action of axial pull have been analyzed. Based on the theories of elastic-plasticmechanics and contact mechanics, a mathematic and physical model of the cartridge-caseand chamber system has been set up; and based on the platform of the general softwarepackage APDL of ANSYS for finite element analysis, a parameterized model of thecartridge-case and chamber system has also been established. The method for nonlinearFEA has been adopted to analyze the stress distribution on the entire cartridge-case andchamber system, and the method of contact element has been employed to investigate thecontact stress between the cartridge case and chamber, and then the influences of frictioncoefficient and locking space on the static and dynamic stress and strain response of thecartridge case and chamber to the action of power gas have also been discussed. On thebasis of a lot of numerical tests, a kind of element Plane13, which is concentrated incoupled computation of heat and construction, has been used finally to simulate thetransient response of the cartridge-case and chamber system to the power gas. Throughloading the temporary thermal characteristics of explosive gas in the procedure of emulate, the corresponding transient thermal stress distributed on the entire system under thecombined load of transient thermal stress and transient pressure has been obtained. Owingto these comprehensive considerations, the numerical results obtained in this paperrepresent the actual situations comparatively exactly.

本文針對某5.56mm自動步槍在工作中出現(xiàn)斷殼的問題欧洲视频一区二区三区，分析了彈殼在軸向拉力作用下的應(yīng)力應(yīng)變；基于彈塑性力學(xué)及接觸理論国产精品亚洲日韩欧美第一页，建立了彈殼彈膛系統(tǒng)的數(shù)學(xué)一级a毛片免灵靠看久久精品、物理學(xué)模型，在通用有限元ANSYS軟件的參數(shù)化建模工具APDL平臺上国产原创自拍，建立了彈殼彈膛系統(tǒng)的參數(shù)化模型黄色视频一区二区观看；采用非線性有限元法計算了彈殼彈膛系統(tǒng)的整體應(yīng)力，引入接觸單元法分析彈殼和彈膛的接觸壓力一级α片屄，探討了在不同的摩擦系數(shù)和不同的閉鎖間隙對彈殼彈膛靜欧美精品黄一区、動態(tài)響應(yīng)的影響；本文進(jìn)行了大量的嘗試操干无码在线视频，最后確定采用熱很在线视频无码一二三四区、結(jié)構(gòu)耦合單元Plane13，在計算中加載了火藥氣體的溫度歷程男人天堂网站网址，成功的獲得了彈殼彈膛系統(tǒng)在瞬態(tài)的熱載荷和瞬態(tài)的壓力載荷同時作用下彈殼彈膛系統(tǒng)的熱應(yīng)力數(shù)值解91精品国产福利下线，考慮因素全面播放一级毛片免费，比較真實(shí)的反映了彈殼彈膛系統(tǒng)在火藥氣體壓力和熱載荷下作用的情況。

In this paper, the 3-D finite element relocating mesh method is used to calculate the temperature field and the thermal creep stress field of spillway dam and mid level outlet dam in certain roller compacted concrete gravity dam, sensitivity analysis have been down with different parameters, such as placing temperature, the location of cooling pipe, cooling temperature, time for water supply, ascended-layer of concrete, intermissive time and different placing time, and the commendatory construction scheme have been put forward in such analysis; according by the test result on the two scheme of concrete aggregate combination (basalt as coarse aggregate and limestone as fine aggregate, basalt as coarse aggregate and basalt as fine aggregate), simulation analysis on temperature field and thermal creep stress field of the commendatory construction scheme have been down, and analysis have also been down on temperature field and thermal stress field of the two different aggregate combination, the result indicates that the spillway dam and mid level outlet dam which adopted these two aggregate combination can both satisfy the require of design crack resistance in concrete, furthermore limestone as fine is better than basalt as fine aggregate; the effect of summer water storage and winter water storage on the temperature field and thermal stress field have been analyzed, comparing with winter water storage, in summer water storage scheme the maximum tensile stress at abnormal concrete in upstream fill is decreased by 0.1～0.3MPa and there are no evidence change of the maximum tensile stress at other parts, which indicate that summer water storage is avail for the crack resistance of upstream fill; according to the simulation calculating result and comparing temperature simulation calculating results and temperature controlling measures of some similarity projects both completed and construction, synthesis appraise have been carried to the design temperature controlling measures of dam, and the temperature controlling measures of this project have been brought forward, all these have great reference value on the design of temperature controlling measures and the optimization of the construction scheme.

本文采用三維有限元浮動網(wǎng)格法仿真計算程序视频在线黄色一区，對某碾壓混凝土重力壩的溢流壩段和中孔壩段分別進(jìn)行了三維有限元溫度場和溫度徐變應(yīng)力仿真計算分析在线国产小黄片，對澆筑溫度、冷卻水管的布置方式毛片一级一区二区三区四区91、冷卻水溫大陆日韩内地欧美在线、通水時間、澆筑升程和間歇時間顶级XXXX性欧美中年熟妇、不同開始澆筑日期等參數(shù)進(jìn)行了敏感性分析国产精品JIZZ在线观看，在此基礎(chǔ)上提出了推薦的施工方案；根據(jù)兩種骨料方案(玄武巖粗骨料+灰?guī)r細(xì)骨料方案亚洲一级性交大片；玄武巖粗骨料+玄武巖細(xì)骨料方案)的混凝土性能試驗研究成果2020人人操人人摸，對推薦的施工方案進(jìn)行了溫度場和溫度徐變應(yīng)力仿真計算，并對比分析了兩種不同骨料情況下的溫度場和溫度應(yīng)力日韩偷窥自拍系列视频在线，結(jié)果表明溢流壩段及中孔壩段采用上述兩種骨料均能滿足混凝土的抗裂設(shè)計要求多人作爱一级黄片，且灰?guī)r細(xì)骨料優(yōu)于玄武巖細(xì)骨料；計算分析了夏季蓄水和冬季蓄水對壩體溫度場和溫度應(yīng)力的影響色哟哟哟，夏季蓄水方案與冬季蓄水方案相比在线观看很黄很水的视频网站，壩體上游變態(tài)混凝土區(qū)域最大拉應(yīng)力小0.1～0.3MPa，其他部位最大拉應(yīng)力無明顯變化欧美一级做一级A，夏季蓄水對壩體上游面混凝土的抗裂有利姐姐直播App；根據(jù)仿真計算成果并通過比較國內(nèi)一些已建和在建的類似工程的溫度仿真計算成果及采取的溫控措施，對大壩的設(shè)計溫控措施進(jìn)行了綜合評價日韩最新无码资源站AV，并提出了該工程的溫控措施羞羞漫画官方网站在线观看，對溫控設(shè)計和優(yōu)化施工方案具有重要參考價值。

Through designing of composition and structure of the bioactive graded coating,innerstress and its distribution in the coating were analyzed and calculated, the resultsshowed that when composition distribution coefficient n was 1.5, a reasonable stressdistribution could be got, that was at the beginning of deposition the suspension containingrichly BG granules was used so that a rich BG granules layer, a good transitional layerbetween BG layer at the bottom and the coating could be obtained at the titanium alloy side,the bottom of the coating; the stress value near the interface and surface and its character,pressure stress or tensile stress, were decided by the character of its composition itself.Changing composition distribution coefficient n could only change the variation tendency ofstress in the coating, but did not change the stress distribution rule in the coating. Thethinner the coating is, the sharper stress variation in the coating is, which does not mean thatthicker coating is better because the thicker the coating is, the little the permitteddeformation of coating is, so the coating thickness should be thinner, for example, about50μm for bending applications, but for applications only bearing pure shear stress, such asroot of tooth implant, the coating can be thicker little, for instance, about 80～100μm. The study on electrification characteristic and electrophoresis deposition of HAand BG granules in aqueous and non-aqueous solution system found that EPD almost didn'toccur in aqueous solution system. However, because HA granules take position charges inabsolute alcohol, a homogeneous EPD be carried out on the cathode titanium alloy slice, but taking negative charge in absolute alcohol the BG granules not be deposited on the cathode. A guided HA crystallizing, 100～300nm, on surface of the BG granules be realized by metathetical reaction, which cover BG granules with HA microcrystals and make the covered BG granules taking position charges in absolute alcohol, sequentially realize the EPCD of the BG and HA granules on the cathode, so it is feasible to make a titanium alloy/BG/HA bioactive graded coating by making use of EPCD technology. The corrosion experiment of rich boron bioglass coating and plasma spray coating showed that split phase, rich boron and rich silicon phase, occurred during its preparation. In basic medium the corrosion behavior of 〓 BG coating showed uniformity corrosion, the corrosion mostly occurred at rich boron phase area, therefore batch formula design of BGshould avoid the occurring of split phase. The corrosion appearance of plasma spray coatingappeared a non-uniform corrosion, mostly occurred at the edge of the laminated HA moltendrops, and emerged an accelerated corrosion tendency, which will easyly lead to corrosioncrackles extending to the interface and the happening of osmotic interfacial corrosion, thatmay be one of the major reasons leading to the coating cracking-off in the later period. Thetesting results of thermal expansion coefficient of 〓 and 〓BG showed the thermalexpansion coefficient of 〓 BG matched with that of titanium alloy better, and 〓 BG couldsinter with titanium alloy into densification enamel layer at low temperature (720℃).

將Ti6Al4V合金在1000℃下進(jìn)行真空熱處理會降低其力學(xué)性能免费一看一毛片，且合金內(nèi)的V元素會向表面富集极品欧美，因此，鈦合金真空熱處理和表面涂層的燒結(jié)溫度不能過高1024你懂的金沙人妻片，即應(yīng)低于其相轉(zhuǎn)變點(diǎn)欧美福利1区；通過對生物活性梯度涂層的組成和結(jié)構(gòu)的設(shè)計，分析和計算了梯度涂層內(nèi)的應(yīng)力大小和分布欧美日韩α片在线观看，結(jié)果表明：對于本研究人人插人人妻，當(dāng)成分分布系數(shù)n=1.5時，可以獲得較合理的涂層力學(xué)性能在线观看激情无码毛片，即在沉積開始時国产1级在线视频网站免费，采用富含BG顆粒的懸浮液，以便在鈦合金側(cè)獲得同底層BG有良好過渡的富BG涂層；梯度涂層界面和表面的應(yīng)力大小九九九九人妻一区精品色、性質(zhì)由材料組成本身的性質(zhì)決定又黄又硬又爽又舒服视频，改變成分分布系數(shù)，只能改變涂層內(nèi)應(yīng)力變化的趨勢色在线视频导航；涂層的厚薄不影響涂層內(nèi)的應(yīng)力分布規(guī)律九九热这里只有精品6666，但涂層越薄，涂層內(nèi)的應(yīng)力變化越快在线黄色观看，但這并不意味著涂層越厚越好玖玖网在线，因為涂層越厚，涂層允許的變形越小欧美高清午夜免费一级A片，對于應(yīng)用于彎曲受力部位的涂層而言草哟哟在线，涂層應(yīng)薄一點(diǎn)為好(50μm)；而對于僅純受剪切應(yīng)力的部位一级毛片免费无码播放，如牙根種植體这里只有精品美女老师，涂層可適當(dāng)加厚(80～100μm)；通過對HA和BG顆粒在水溶液體系和非水溶液體系中的帶電特性和電泳沉積的研究發(fā)現(xiàn)国产经典99久久不卡中国情侣，它們在水溶液體系中很難發(fā)生電沉積中文字幕第22页；在無水乙醇溶液中，HA顆粒帶正電国产一级a一片免费视频，可在陰極鈦合金片上發(fā)生均勻的電泳沉積午夜免费电影网，而BG顆粒則帶負(fù)電荷；利用復(fù)分解反應(yīng)法美国不卡av，可以制得100～300nm的HA亚洲另娄视频，通過誘導(dǎo)HA在BG顆粒表面結(jié)晶，可對BG顆粒進(jìn)行表面包覆欧洲黄色官网，獲得了被HA包覆的BG顆粒99re热这里有精品，改變了BG顆粒表面的帶電特性，使BG和HA顆粒在無水乙醇中均帶上正電荷jizzjizz99，從而實(shí)現(xiàn)了HA和BG顆粒在陰極上的共沉積熟女69导航。

As showed in Fig.1, the diagrammed stress of short time endurance test forAs showed in Fig.1, the diagrammed stress of short time endurance test for500 hours at 565℃on welded-joint of T91-F12 is 240MPa. Considering the℃on welded-joint of T91-F12 is 240MPa. Considering thedispersity of±20％, stress of check test for 500 hours is 192MPa. The result±20％, stress of check test for 500 hours is 192MPa. The resultof short time endurance test for 500 hours at 565of short time endurance test for 500 hours at 565℃on T91-X20CrMoV121℃on T91-X20CrMoV121welded-joints is showed in Tab.5. The result shows that the short timewelded-joints is showed in Tab.5. The result shows that the short timeendurance stress of weldedendurance stress of welded-joints with two procedures at 565℃for 500 hours-joints with two procedures at 565℃for 500 hoursboth above 192MPa, and meet the requirement.both above 192MPa, and meet the requirement.

依據(jù)圖1，對T91－F12 焊接接頭 565℃溫度下的短時持久性能 500 小時考核試驗依據(jù)圖191popny丨九色国产，對T91－F12 焊接接頭 565℃溫度下的短時持久性能 500 小時考核試驗的圖示應(yīng)力值應(yīng)為 240MPa，按照持久強(qiáng)度試驗數(shù)據(jù)的±20％的分散度国产精品一区二区综合亚洲，取 500的圖示應(yīng)力值應(yīng)為 240MPa日韩成熟熟女精品自拍视频，按照持久強(qiáng)度試驗數(shù)據(jù)的±20％的分散度，取 500小時考核試驗應(yīng)力值為 192MPa.T91－X20CrMoV121 焊接接頭 565℃国产污黄视频网站视频免费看、500 小時小時考核試驗應(yīng)力值為 192MPa.T91－X20CrMoV121 焊接接頭 565℃欧美黄色网站一区、500 小時短時持久考核試驗試驗結(jié)果見表5 ，試驗結(jié)果表明，兩種工藝條件下的焊接接頭短時持久考核試驗試驗結(jié)果見表5 亚洲第一小电影免费网站，試驗結(jié)果表明16萝粉嫩自慰喷水，兩種工藝條件下的焊接接頭565℃溫度下的短時持久性能，500 小時的持久斷裂應(yīng)力均高于 192MPa免费高清一区二区不卡片，結(jié)果符565℃溫度下的短時持久性能一道本天堂在线视频，500 小時的持久斷裂應(yīng)力均高于 192MPa，結(jié)果符合要求欧关一级A片欧美黑人一级A片。

The results of these analysis show that the initial stress of steel stiffened girder has a significant impact on maximum vertical displacement, maximum tensile stress of pavement surface and maximum shear stress of binding course; the deformation of steel stiffened girder has a significant impact on shear stress of binding course; heavy-vehicle load can increase each control index rapidly; the horizontal force of vehicle load has a significant impact on longitudinal tensile stress of pavement surface and longitudinal shear stress of binding course.

分析結(jié)果表明鋼加勁梁初始應(yīng)力對鋪裝層表面最大豎向位移一级黄色片在线观看视频、鋪裝層表面最大拉應(yīng)力與粘結(jié)層最大剪應(yīng)力均有顯著影響；鋼加勁梁變形對粘結(jié)層剪應(yīng)力影響顯著国产清纯白嫩初高生在线；重車荷載將使各控制指標(biāo)均急劇增加www.女干.com；車輛荷載的水平力則對鋪裝層表面縱向拉應(yīng)力與粘結(jié)層縱向剪應(yīng)力影響顯著。

Alone cold stress, simulated 2 km hypoxia stress (4 hours/day, continuation for 2 days)+ cold, 2 km hypoxia stress, 2 km hypoxia stress + restraint stress and alone restraint stress all significantly decreased rats body weight gain.

與各自的單獨(dú)應(yīng)激相比較欧美在线自第一页，冷應(yīng)激+5km低氧(4小時／天日韩中文字幕自拍视频，連續(xù)2天)的復(fù)合應(yīng)激，束縛應(yīng)激+5km低氧的復(fù)合應(yīng)激顯著地抑制了大鼠體重的增重日韩成人网址播放。