查询词典 a hard nut to crack

Nut series: Hex flange nut, nylon nut, with sets of teeth, K nut, square nuts, butterfly nuts, cap-type nut, bolts, plum-type shrapnel, Groove nut, welding nut, thin nuts, both inside and outside the dental cone mother, Nut, the plastic nut, valve nut, pipe joints, back caps, sleeves and other metal products.

螺母系列：六角法兰螺母、尼龙螺母、内套牙、K螺母、方螺母、蝶型螺母、盖型螺母、螺栓、梅型弹片、槽型螺母、焊接螺母、薄型螺母、内外牙锥母、防松螺母、塑胶螺母、阀螺母、管接头、倒帽、套筒等五金产品。

Nut Series: Hex flange nuts, rivet nuts, rivet stud pressure (through-hole and hole barrier), up rivet nut, nylon nut, with sets of teeth, K nut, square nuts, butterfly nuts, cap-type nut, bolts, Mei-type shrapnel, Groove nut, welding nut, thin nuts, conical teeth outside the mother, Nut, the plastic nut, valve nut, pipe joints, back caps, sleeves and other metal products.

螺母系列：六角法兰螺母、铆螺母、压铆螺柱、涨铆螺母、尼龙螺母、内套牙、K螺母、方螺母、蝶型螺母、盖型螺母、螺栓、梅型弹片、槽型螺母、焊接螺母、薄型螺母、内外牙锥母、防松螺母、塑胶螺母、阀螺母、管接头、倒帽、套筒等五金产品。

The company specially has the superiority in the US standard screw and each kind of high difficulty non- sign aspect, moreover may provide each kind of material quality product according to the customer request, the concrete item includes: Outside US standard in hexagonal screw, US standard hexagonal screw, US standard horse-drawn vehicle screw, US standard set screw, US standard pan head screw, US standard flat screw, US standard studs screw, US standard threaded rods, US standard eye bolts screw, US standard welding screw, US standard T screw, US standard square head screw, suspension loop screw, US standard hexagon nuts, US standard flange nut, US standard nylon nut, US standard hexagon machine nut, US standard cover nut, US standard butterfly nut, US standard square nut, US standard round nut, US standard suspension loop nut, US standard ball pad, US standard flat washers and so on US standard fastener and each kind of high difficulty non- sign design.

公司特别在美制螺丝及各种高难度非标方面具有优势，而且可以根据客户要求提供各种材质产品，具体品项包括：美制外六角螺丝、美制内六角螺丝、美制马车螺丝、美制紧定螺丝、美制盘头螺丝、美制十字槽盘头螺丝、美制平头螺丝、美制双头螺丝、美制牙条、美制活节螺丝、美制焊接螺丝、美制T型螺丝、美制地脚螺丝、美制碟型螺丝、美制鞋子定位螺丝、美制方头螺丝、美制吊环螺丝、美制六角螺母、美制法兰螺母、美制尼龙螺母/美制自锁螺母、美制尼龙盖帽螺母、美制六角机螺母、美制六角薄螺母、美制浮动螺母、美制盖型螺母、美制六角嵌入式螺母，美制K帽，美制蝶型螺母、美制方螺母、美制圆螺母、美制压铆螺母，美制吊环螺母、美制不锈钢开口销、美制弹垫、美制平垫等美制紧固件及各种高难度非标设计。

Mainly engaged in: stainless steel 202,304,316, copper, aluminum, high-strength carbon steel GB, American Standard, S Day, German standard of the outer hexagon, internal hexagon, Ping Cup, Yuan Cup screws, tight set (machine-processed rice) screws, open sale, axis with circlips, ring openings, flat pad, flexible sale, the Quartet nut, hexagonal nut, welding nut, pull rivet nut, rivet nut pressure, flange nut, nylon self-locking nuts, nut dish, cover type nut, flat keys Article teeth, the cylindrical pin, internal tooth, external tooth, double-headed screws, wood screws Festival, self-tapping screws, self drilling screws, machine screws , hexagonal key.

主要经营：不锈钢202、304、316、铜、铝、高强度碳钢国标，美标，日标，德标的外六角，内六角，平杯、元杯螺丝，紧定螺丝、开口销，轴用卡簧、开口挡圈，平垫，弹性销，四方螺母，六角螺母，焊接螺母，拉铆螺母，压铆螺母，法兰螺母，尼龙自锁螺母，碟型螺母，盖型螺母，牙条平键条，圆柱销，内齿，外齿，双头螺丝，活节螺丝，自攻螺丝，自钻螺丝，机螺丝，六角匙。

When the mind apprehends the essence of a thing (quod quid est; tò tí en enai), the external object is perceived without the particular notes which attach to it in nature, and it is not yet marked with the attribute of generality which reflection will bestow on it.

当铭记apprehends的本质的东西（狱吏嚼1-5 ；德州仪器恩enai ），外部对象被认为没有特别注意到它重视它的性质（中存在singularibus ），这是没有标明属性一般性的反映将赋予它

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。。。

Book equipment application in automobile, motorcycle, machinery foundation profession such as chain, fastener, bearing, box spanner, tool, special different type nut and flange surface nut, sides nut, welding nut, cover type nut , locknut, defence pine nut, pull hat nut, chain Luo pull, expansion gecko, independently axle gear, bicycle different type etc.

本设备应用于汽车、摩托车、机械基础行业（如链条、紧固件、轴承、套筒扳手、工具、特殊异型螺母、法兰面螺母、四方螺母、焊接螺母、盖型螺母、锁紧螺母、防松螺母、拉帽螺母、链条罗拉、膨胀壁虎、自行轴挡、自行车异型件等）等各类异型、复杂非标件的冷挤成型，适用范围广泛。

Main products: Pressure riveting screw, nut riveting pressure, pressure riveting nut -, Inserts into the nut, rose riveting nut, floating nut, ground-nuts, nut-squeezing, Spring screws, self-locking nut, positioning support columns, targeted marketing, sales support cards, in spring, the combination of screws, rivets hollow, as well as various Pressure riveting type of plastic fasteners, etc.!

主要产品有：压铆螺钉，压铆螺母，压铆螺母柱，镶入螺母，涨铆螺母，浮动螺母，接地螺母柱，挤压螺母柱，弹簧螺钉，自锁螺母，定位支撑柱，定位销，支撑卡柱弹簧销，组合螺钉，空心铆钉，以及各种塑料压铆类紧固件等！

Crack propagation problems under the influence of the edges of the crack subjected to homogenous loads, the origin of the coordinates subjected to concentrated increasing loads, the central zone of the edges of the crack subjected to homogenous loads, the certain point of the edges of the crack subjected to moving unit step loads, the origin of the coordinates subjected to moving increasing loads Px m, the edges of the crack subjected to instantaneous impulse loads, the edges of the crack subjected to moving concentrated variable loads, the origin of the coordinates subjected to point loads, the edges of the crack subjected to a constant moving concentrated loads and the origin of the coordinates subjected to instantaneously moving impulse loads are studied respectively, and the analytical solutions of dislocation distribution function have been obtained.

同时对裂纹面受均布载荷、坐标原点受集中增加载荷、裂纹面中心区受均布载荷、裂纹面上某点受运动阶跃载荷、坐标原点受运动增加载荷Px m、坐标原点受瞬时冲击载荷、裂纹面受运动集中变载荷、坐标原点受集中载荷、裂纹面受常数运动集中载荷、坐标原点受瞬时运动冲击载荷作用下的裂纹扩展问题分别进行了研究，获得了位错分布函数的解析解。

The crack that see much of most in several residence is that a layer maneuver a wall to hand over to connect place to have the stairs form the crack creation;Hand over to connect place or beam bottom and wall body to have the level crack the creation in the house noodles and the wall body;There is Shu under the first floor window sill toward the crack creation, the window sill of each floor two wall window way outside the layer four Cape existence inclined crack;Small scaled and hollow carve in the reinforced concrete pillar and the Mao a piece of fill a wall of mutually knot existence the Shu is to the crack;It is carve a piece periphery a creation crack.

随着国家保护耕地措施的实施，粘土砖的使用逐步得到控制，砼小型空心砌块在住宅工程中开始得到越来越多的应用期刊文章分类查询，尽在期刊图书馆在多层住宅中最常看到的裂缝是顶层纵横墙交接处有阶梯形裂缝产生；在屋面与墙体交接处或梁底与墙体间有水平裂缝产生；在底层窗台下有竖向裂缝产生，各个楼层的窗台两角和顶层外墙窗口四角处有斜裂缝存在；在钢筋混凝土柱和砼小型空心砌块填充墙的相结处有竖向裂缝存在；在砌块周边产生裂缝。

They experience feelings deeply and intensely, and their emotions are often mercurial.

他们的感情深刻而强烈，情绪善变。

Surrounded with or as if with a rampart.

用城墙围绕的用城墙围绕的或类似于为城墙围绕的