有裂纹的

Special solutions for the ring circular domain with crack surfaces acted on uniform compressive force, linear compressive force and linear shearing force are deduced in polar coordinate employed the eigenfunction expansion technique in the Hamiltonian system of elastic mechanics. Combined with the general solution for the above problems, the analytical solutions for crack tip fields with surfaces acted on the above three kinds of loads are obtained. These solutions offer theoretical basis to construct analytical elements for plastic analysis of crack.

从弹性力学哈密顿体系理论出发，利用平面弹性力学极坐标系下的本征向量展开求解，推导了环形圆形域裂纹边作用有均布压力、线性压力和均布剪切力情况下的特解，从而得到了裂纹表面作用有以上三种荷载情况下的裂纹尖端场的解析解，为进一步构造进行弹塑性裂纹分析的奇异解析元奠定了理论基础。

I've seen some good men get blown over G-packs In the Bronx where it's known to hear the heat clap And live niggaz get it on with the D-techs, SHIT, my life's legendary If I wrote down all in a book it would be very scary What you know 16 be missin' Benzes Rope chain down to my dick, the beef looks tremendous Me and my niggaz flip holes in bitches Back then, when I wouldn't even pose for bitches A-YO, you can ask dapadan who was the man Back in 88, every other week tricked 30 grand Even my bitches wore Gucci and Louie My peeps already in the crowd looking for groupies to screw me Exit the club, about to cruise up the block now with the taj, stay frontin' with top down See me in that new thing with my fiancee Ass so fat, making you say "Muchos GRANDE" Don't blame me, blame them, the white folk for giving me ten mil, for possessin' the tight flow WHOA [Chorus: repeat 2X] Ya'll wanna live my lifestyle Never seen a brick, never seen a crackhouse Wanna a war with the Don have your techs out Bring it on, and I'm show you gangsta [Verse 2] Yeah, yeah, uh, yo, blow half your head off, leave you with brain damage He got his shit rocked cause he didn't pay homage It's the Don of this rap shit, go on with that wack shit Heard you walked the dorm in a thong on your last bid Joey Crack is, the most official Toke the pistol for those who appose the issue I hope I convinced you to back up, really you acted up, believe me I could EASILY GET YOUR ASS TOUCHED And that sucks, ain't nobody could fuck with this Bullet shook could make you take a bucket of piss For runnin' your lips Got the fifth stuck in your ribs, don't make me...

我见过一些好的男人得到吹超过国包在布朗士区，它在已知听到热拍住niggaz得到它同为d -科技股， shit的，我的一生的传奇如果我写下来的一本书，这将是非常可怕的你知道16 missin ' benzes 绳链，以我的迪克，牛肉看起来巨大我和我的niggaz倒装孔犬当年，当我甚至不构成对犬-顿，你可以要求dapadan谁是男子早在88 ，每隔一周骗30大甚至我的犬穿着诺特美联社11 我的peeps已经在人群中寻找groupies以螺丝我退出俱乐部，即将邮轮了，现在座与泰姬陵，逗留frontin '由上而下见我在这件新鲜事，我的未婚妻群丛，使脂肪，使你说& muchos重创&不要怪我，责怪他们，白民歌给我10 mil ， possessin '紧迫流 whoa [合唱：重复2倍速] ya'll想住我的生活方式从未见过砖，从未见过crackhouse 想要战争与顿河有你的科技股列使之对，我敢表明您gangsta [韵文2 ] 嗯，嗯，嗯，协青社，打击了一半，你的脑袋过，留给你的脑损伤他得到了shit的轰动的原因，他不来顶礼膜拜它的顿河的此次rap shit的，继续与wack shit的听到你走到公寓在一个通对你的最后一个申办乔伊裂纹，最正式 toke手枪对于那些appose问题我希望我确信你回来了，真是你们的行动了，请相信我我可以轻易获得您的依次为感动并且吸收，是不是任何人都无法他妈的这子弹震撼了，可以使你的一桶独立私校为runnin '你的嘴唇获得第五停留在你的肋骨，不要让我。。。

I wake up early in the mornin, at the crack of dawn Nigga still tired so I'm yawnin, and now I'm gone Tryin to get my money on strong, so an early riser Out befo' them other guys, that's the way to profit every time Can't get too close, my enemies, they see ghosts, they envy me Plus we been beefin with the East coast, with casualites Got stopped in traffic, had a warrant, so they gaffled me But while I'm gone, watch my business, and my back for me My enemies think they got me crossed, they ain't knowin Ain't no love for player haters where you cowards goin You paid bail, got me out of jail, home again I promise not to leave you on your own again Cristal corks are popped, romantic, thoughts are dropped It's so frantic but don't panic cause we crossed the top I found a partner and a rider, a woman and friend All that is dead though, I'm changed, I'm tellin you..

我醒来早在mornin ，在裂纹的曙光 nigga仍然疲倦，因此我yawnin ，现在我经历了 tryin让我的钱，就强烈，因此，早期冒口列befo '，他们的其他球员，这就是利润每一次不能太接近，我的敌人，他们看到鬼，他们羡慕我再加上我们一直beefin与东海岸，与casualites 得到停在交通，有一个手令，所以他们gaffled我不过，虽然我走了，看我的业务，和我回到我的我的敌人，认为他们让我越过，他们是不会knowin 是不是没有爱的球员haters您懦夫走您支付保释金，让我走出监狱，民政再次我答应不离开对你自己的再次 cristal corks是出现了，浪漫的，思想是下降它的疯狂，但不要恐慌，导致我们越过顶端我发现一个合作伙伴和一个骑士，一名女子和朋友所有这一切都是死亡，虽然，我改变了，我tellin你。。

Through the observation via scanning electron microscope,we can discover that chips mainly have three types of micro-shapes like acicular,massive and squamose,its formation corresponds to PBX macro-fracture which caused by the nucleation and growth of crack and mainly embodied as transgranular fracture of explosive particles.

利用SEM观测发现PBX切屑主要有针状、块状和鳞片状三种细观形态，切屑的形成体现为裂纹的成核扩展导致的宏观断裂，并主要表现为炸药颗粒的穿晶断裂。

The requirements of this section shall be considered as having been met if the four tests have been completed in consecutive order and the test sample has not suffered any water ingestion, discolouration of lens, crack or fatigue of the plastic or glass, and remain in full working order.

本节规定的要求曾经遇到的四个测试完成订单和试验样品连续，没有任何水吸入的变色，或疲劳裂纹的镜头您觉得最佳答案好不好？目前有0人评价

Using a dedicated high-precision polishing machine will be take high-tech nano-anti-fouling agents dripping polished surface, through repeated pressure grinding head polishing rinding ,polishing let's anti-fouling agents to be better to penetrate into the pores polished internal completely blocked pores polished and micro-cracks, to become the special, continuous nano-membrane, so that polished surface to prevent invasion of the functions of all pollutants, stains with the clean water can touch off; At the same time ,higher gloss, reached 90 degrees Celsius, and has the following outstanding performance

采用一种专用的高精度抛光机将高科技纳米防污剂滴到抛光砖的表面，通过抛光磨头的反复施压，打磨，抛光，将防污剂更好地渗透到抛光砖的毛孔内部，完全堵塞了抛光砖的毛孔及微裂纹，形成一种特殊的，连续的纳米膜，从而是抛光砖表面具有阻止一切污染物入侵的功能，污渍用水一抹就干净；同时光泽度更高，达到90度以上，并具有以下有一的性能

The analysis shows that, the maximum stress change appears in the heat affected zone of the flange's center and it has main influence on surface crack of flange plate and the maximum stress is less than the allowable stress 235 MPa of the material, which is in the reliable range.

分析结果表明，最大的应力变化出现在法兰盖板中心的热影响区，对盖板表面裂纹有主要的影响，最大应力小于材料的许用应力235 MPa。

Crack reasons for this are: the heating temperature is too high as a result of quenching or cooling in a hurry, the quality of thermal stress and metal volume changes in the organization of the anti-stress than the breaking strength of steel; the work of the original surface defects (such as surface micro-cracks or scratches) or the internal defect of steel (such as slag, serious non-metallic inclusions, white point, the residual cavity, etc.) formed in the quenching stress concentration; serious Decarburization and carbide surface segregation; parts after quenching Back lack of timely or tempering fire; processes in front of the stress caused by excessive cold red, forging folding, turning deep marks, sharp edges and corners, such as the oil groove.

造成这种裂纹的原因有：由于淬火加热温度过高或冷却太急，热应力和金属质量体积变化时的组织应力大于钢材的抗断裂强度；工作表面的原有缺陷或是钢材内部缺陷（如夹渣、严重的非金属夹杂物、白点、缩孔残余等）在淬火时形成应力集中；严重的表面脱碳和碳化物偏析；零件淬火后回火不足或未及时回火；前面工序造成的冷冲应力过大、锻造折叠、深的车削刀痕、油沟尖锐棱角等。

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.

主要完成研究内容和取得成果如下：(1)利用有限元软件计算出紧凑拉伸试样的裂纹尖端应力强度因子KI值，其结果与理论值一致，从而验证了利用ABAQUS计算裂纹尖端相关断裂参量的可行性；(2)在研究内聚应力等相关理论的基础上，推导出了研究尺度与材料弹性模量的近似关系，并确定了介观尺度上的弹性模量；(3)在宏观尺度上建立了全局有限元计算模型和子模型，得到了裂纹尖端应力应变场分布，结果表明利用子模型技术获得比较准确的裂纹尖端应力应变场分布是可行的；(4)在介观尺度上利用平均晶粒尺度的方式建立了裂纹沿晶扩展模型，得到了裂纹尖端断裂过程区的微观应力应变场；(5)当应力强度因子为30MPa.m1/2时，分析了介观尺度上在裂纹沿晶扩展过程中裂纹长度对Mises应力、最大主应力和应变的影响，结果表明，裂纹扩展长度对试样整体应力应变分布影响不大，而对裂纹尖端区域有较大影响；(6)介。。。

As an example of application, the study on small scale shear failure of Al-Zn-Mg-Cu plate under complicated strain and stress states, especially within the plastic zone ahead of a pre-crack, would promote our understanding of the fracture mechanism, of the shielding effect caused by cracking path deflection, and of the mechanism of fracture toughness anisotropy of textured high strength aluminium alloys.

作为一个应用实例，本文关于Al-Zn-Mg-Cu厚板在复杂应力应变状态下的小尺度剪切失效机制的研究，对于了解工业高强变形铝合金的断裂过程、了解裂纹扩展途径偏斜所引起的shielding效应、了解断裂特征和断裂韧度的各向异性等实际问题也是很有启发的。并已被Materi-als Science and Technology认为是&an interesting piece of work containingsome original idea s&。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。