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The stability of L5S1 ALIF specimen in extension is less than that of intact specimen, and ALIF combined with translaminar facets screw is the most ideal internal fixation to enhance its biomechanical stability of ALIF specimen.

结论] L5S1单纯行ALIF后伸稳定性差,为增加其稳定性,经椎板关节突螺钉应当是首选的内固定器械。

To evaluate the biomechanical stability of lumbar intact specimen, anterior lumbar interbody fixation specimen, ALIF specimen fixed with pedicle screw and ALIF specimen fixed with translaminar facets screw.

目的] 对腰椎完整标本、单纯腰椎前路椎间融合术、ALIF分别行椎弓根钉固定及经椎板关节突螺钉固定4种状态进行测试,比较生物力学稳定性。

The fatigue is analyzed for the SENT specimen of TA6V titanium alloy at different stress ratio and on different stress level by the general finite element analysis software ANSYS. The dangerous fatigue location is predicted by the nodal stress Y-direction of the hemicycle notch for TA6V titanium alloy SENT specimen. Based on the local stress-strain method and the material S-N graph, the nominal stress-strain of the specimen is converted to the local stress-strain of the dangerous location by the elastic and plastic finite element analysis, thus the fatigue life is estimated by Miner fatigue damage accumulation theory and compared with the fatigue test of small crack growth.

借助大型通用有限元分析软件ANSYS对TA6V钛合金SENT试样在不同应力比和不同应力水平下进行疲劳分析,根据SENT试样缺口处的应力状态分布预测疲劳危险部位,采用局部应力应变法,结合材料循环的S-N曲线,通过弹塑性有限元法将构件上的名义应力谱转换成危险部位的局部应力应变谱,从而根据危险部位的局部应力应变历程采用Miner累积损伤理论对构件的疲劳寿命进行估算,并与疲劳小裂纹试验数据进行比较分析。

The microfracturing process of Jinping marble specimen in Sichuan province under uniaxial compression is recorded by using the testing scheme. Quantitatively investigated the propagation and coalescent of cracks at meso-scale with digital technology, the basic geometric information of rock microcracks such as area, angle, length, width, perimeter, are obtained from binary images after segmentation. The failure mechanism of specimen under uniaxial compression with the quantitative information is studied from macro/micro scopic perspective. The result shows that during the damage of the specimen the distribution of microcracks in the whole specimen are still subjected to exponential distribution with some microcracks concentrated in certain regions.

应用于四川锦屏大理岩预制裂纹试样中进行单轴压缩破坏全程的数字化试验,对微裂纹的萌生、生长及贯通过程进行数字化定量分析,得到试样在受荷过程中微裂纹的面积、方位角、长度、宽度和周长基本几何数据,从宏细观角度描述了岩石试样单轴压缩过程中的破坏机制,并分析得出试样单轴受压破坏过程中虽然微裂纹在某些区域集中,但在整个试样中微裂纹的统计分布依然是服从某一指数分布的这一结论。

The experimental results show that: the failure mode of strengthened beam at elevated temperature can be classified as flexure failure mode or flexure-shear failure mode, and the failure mode of strengthened beam at high temperature may be different from that at room temperature; and although the load supported by the strengthened specimen is larger than that supported by the unstrengthened specimen, the fire resistance of the strengthened specimen is still larger than that of the unstrengthened specimen, due to the influence of fire insulation.

结果表明:高温下该类构件的破坏形态大致可分为受弯破坏和弯剪破坏两类,常温下发生弯曲破坏的加固构件有可能在高温下出现破坏形态的转变;虽然加固构件所承受的荷载明显大于未加固构件,前者由于防火涂料的保护,其耐火极限仍大于后者。

To avoid its use as a legal tender note, it can be perforated, punched, without a serial number or a serial of 000000, overprinted with the word "Specimen" or "Cancelled" in any language.

为了避免票样被用作法定纸币,票样都被打孔,穿孔,不带编号或只带有000000编号(全为0),并在其表面以各种语言印有&Specimen&或&Cancelled&的字样。

The effects of strain rate on plastic formation and dynamic recrystallization of 7050 aluminum alloy were discussed. The results show that the deformation of the specimen is inhomogeneous, and the effective strain in the center of the specimen is maximum. The deformation inhomogeneity increases with the increase of strain rate. The effective stress of specimen is inhomogeneous. As the strain rate increases, the minimum stress value moves from the drum-shaped region to the heart of specimen. The standard deviation of dynamic recrystallization grain size decreases with the increase of strain rate.

模拟结果表明,热变形过程中,试样的各个部位的变形分布不均匀,心部的等效应变最大,变形的不均匀性随应变速率的增大而增大,但是变化的程度不大;试样内部各部位的应力大小分布不均匀,随应变速率的增大,最小应力值由自由变形的鼓形区域逐步向心部移动;动态再结晶晶粒尺寸标准偏差随应变速率的增加而减小。

A Dense scale on the2O3(Cr/Y=4/1) coated specimen;2O3(Al/Y=3.6/1) coated specimen; Oxide nodules formed at the corner on the specimen coated with2O3(Cr/Y=2/1) deposited for 15 s; Locally spalled scale on the same specimen as in; The trace of cracks in the deposited oxide film on the scale formed on the specimen coated with2O3 (Cr/Y=2/1) deposited for 60 s; Showing the similar trace on the same specimen as in b

沉积复合OTFC试样的氧化层形貌有如下特征:(1)氧化层绝大部分致密、完整、与基体附着良好,晶粒细小(图7a,7b);(2)在短时间(15s)沉积2O3 OTFC试样的局部表面出现了不均匀氧化(图7c,7d),但只是在沉积Cr/Y=4/1膜试样的局部表面产生了类似无涂层Fe25Cr上剥落的厚膜(图7d);(3)沉积2O3(Cr/Y=2/1) 60s(图7e)与15s(图7c)的结果不同,前者整个试样表面氧化产物颗粒细小,无粗大氧化物颗粒形成;(4)沉积2O3(Cr/Y=2/1) 60s和2O3(Al/Y=3.6/1)薄膜的试样由于氧化增重非常少,氧化层很薄,刻印着涂层中局部出现的裂纹(图7e,7f),这种印迹的保留可能反映着传质机制的改变,即新氧化物由在外表面形成转变为在外表面以下形成。

Put two adjacent fabrics(single-fibre cloth), each measuring 5 cm ×4 cm , side by side on a specimen measuring 10 cm × 4 cm, next, either sew roughly four sides of the specimen with white cotton sewing thread, or fold in half the specimen into 5 5 cm ×4 cm size so as to lay the adjacent fabric inside, and sew roughly at its near centr of the specimen with white cotton sewing thread to make the sewing line parallel to the folding line.

把两个相邻的织物,每5厘米× 4厘米,并排于试样测10厘米× 4厘米,在未来,无论是缝纫大约四个方面的标本与白棉缝纫线,或褶皱在一半标本到五五厘米× 4厘米大小等,以奠定相邻织物内,并缝合大约在其中心附近。该标本与白棉缝纫线,使缝纫机线平行的折线。

Put two adjacent fabrics(single-fibre cloth), each measuring 5 cm ×4 cm , side by side on a specimen measuring 10 cm × 4 cm, next, either sew roughly four sides of the specimen with white cotton sewing thread, or fold in half the specimen into 5 cm ×4 cm size so as to lay the adjacent fabric inside, and sew roughly at its near centr of the specimen with white cotton sewing thread to make the sewing line parallel to the folding line.

把两个各自5厘米× 4厘米毗连的织布,并排放置成10厘米× 4厘米的试样,然后用白棉缝纫线粗略地在试样四周进行缝制,或把试样对折成5厘米× 4厘米大小以确保毗连的织物放在里面,然后用白棉缝纫线以平行于对折线的方向在试样近中心处进行粗略缝制。

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