In polycrystal, triple junction is an important grain defect which plays an important part in the deformation behavior and fracture. However, it is still less known. In this paper, zero-tension-zero test under stress control on tricrystal which grew from pure copper of 99. 999% by the Bridgman method was carried out, and the appearance of surface slip line was also obtained.

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Explain that fracture energy and strength decrease from the viewpoint of surface energy and surface tension.

從表面能及表面張力的觀點(diǎn)分析了斷裂能和強(qiáng)度降低的原因。

The authors adopted the software of finite element to simulate rock tension fracture, gave the breakdown of extensional criterion, selected the round, arch wall, rectangle, trapezoid and hemicycle as the simulation models and obtained the tension fracture forms of different shape chambers.

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Fractography analysis shows that the global tension failures trimly,because of matrix cracks and tension fracture of fiber and the compression specimens failure in a shear plane about a little angle to the compression loading direction because of delamination and longitudinal fiber shear fracture.

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Methods:Twelve patients with fresh transverse fracture of patella were reviewed in the study.The hemarthrosis,blood clot,fracture fragments and soft tissues between them were cleared with arthroscopy.With the help of C-arm X-ray,the fracture was reduced with manipulation method.After the articular facet reached anatomical reduction,two Kirschners were inserted percutaneously from proximal end to distal end of fracture to fix the fragments,Two hollow screw were put along the approach of Kirschners,and tension band fixation was performed with the shape of "8".Results:All the patients were followed up averagely 12.4 months.

12例新鮮髕骨橫骨折患者通過(guò)關(guān)節(jié)鏡清理關(guān)節(jié)腔內(nèi)的血凝塊欧美一级日韩片、碎骨塊和骨折塊之間嵌頓的軟組織，直視下觀察骨折復(fù)位情況以指導(dǎo)骨折復(fù)位固定人人搞人人干人人操，在C形臂X線透視下幫助骨折復(fù)位国产黄色视频影院你懂的，關(guān)節(jié)鏡觀察關(guān)節(jié)面解剖復(fù)位后，經(jīng)皮從近折端向遠(yuǎn)折端平行打入2枚克氏針固定骨折塊黄网站一级视频免费看，順克氏針擰入2枚中空螺釘Jizz中国女人，拔除克氏針，順螺釘空心導(dǎo)入鋼絲，行張力帶&8&字固定1024手机免费视频。

Based on linear elastic fracture theory, a damage evolution equation for composite soild propellant under uniaxial tension is derived. Main mecrosopic of material are determined through fittin the experiment data of constant rate tension. Then, the integrate constitutive equations found is close to microlevel.

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The equilibrium phase particles that induce the sensitivity of the quenching are not the direct reason that causes the alloy fracture; the microzone of PFZ around particles limits crack extension and coordinates deformation, this causes the formation of the ductile tension fracture.

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METHODS: Eight fresh patellae specimens were divided into two groups at random, AO steel wire group (n = 2) and absorbable tension band group (n = 6) to create models of transverse fractures, which were separately fixed by absorbable tension band, steel wire tension band + Kirschner wire to measure their biomechanics function. If fracture gap reached 1.0 mm, the fixation failed.

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The hoop tension force is axisymmetrical about the tension direction and increase from the top position to both sides. The distribution of hoop tension force is even with small friction coefficient, but will increase rapidly from top to side positions, which subsequently result in necking and fracture near the edge of gauge section.

結(jié)果表明：采用正壓力線性變化假設(shè)所得的切向力分布規(guī)律與拉伸實(shí)驗(yàn)結(jié)果吻合較好欧美极品视频；切向力關(guān)于拉伸方向呈軸對(duì)稱分布国内精品视频_区二区，從正上方到兩側(cè)逐漸增大；當(dāng)摩擦系數(shù)較小時(shí)曰批A片，切向力分布較均勻黑人巨大精品欧美在线观看，但當(dāng)摩擦系數(shù)較大時(shí)，切向力從正上方到兩側(cè)迅速增大欧美福利网址，試樣的頸縮和斷裂發(fā)生在標(biāo)距段內(nèi)靠近標(biāo)距邊緣的位置欧洲爽爽网站欧美。

However, there axe defects of the surgical operation in three cases, two cases suffer from knee joint dysfunction as the result of long stay of pin tail of the Kirschne and the left is caused by poor fracture reposition Conclusion: The tension-band internal fixation for the treatment of fractures has such advantages as no external fixation after surgery, early functional exercise, quick fracture healing, good recovery of joint function and resuming the ability to work as early as possible.

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