The main research contents and results embody as follows: According to the two typical drawing simulation of box part and cylindrical part, it is arrived a main method in improving sheet metal forming ability as follows: in the qualification of not initiating the wrinkle, brought more particle in fillet region into straight flange region, in the meantime cause the particle in the straight flange region run more distance towards the middle region which resistance is the minimal. A theoretical study of new technique is developed in sheet metal forming base on virtual power principle. The results indicate that decrease the equivalent stressσ, improve the lubricate state in contact surface, decrease the area, the normal contact stressσn and the equivalent strain velocityεin initial principal deformation region, adjust and optimize the particle cycle flow of work piece flange face will greatly increase the sheet metal draw ability in room temperature conditions. And drawing hole forming technology is araised based on the analysis above.
本文的主要研究内容和结果体现在以下几个方面：根据两个典型的拉深工艺盒形件和筒形件拉深的数值模拟结果，研究得出为提高板料拉深成形性能而应采取的工艺措施是，在不引发起皱的条件下，使得圆角区域中的质点更多地进入直边区域中，同时使直边区域中的质点、朝着流动阻力为极小的中部区域移动更大的距离；依据塑性力学的基本原理——虚功率方程，基于提高板料的成形性能的目的，对虚功率原理关系式中每项参数的变化，进行了深入的分析后得出，在覆盖件的拉深过程中，可通过适当的工艺方法与措施，减小等效应力σ，改善接触面上的润滑状态，减少初始主变形区的面积，减小主变形区的法向接触应力σn的量值，减小主变形区的等效应变速率ε，起到调节与优化工件法兰面上的质点的周向流动的作用，以此为基础，提出了拉深孔的工艺措施即拉深孔成形新工艺。
In present paper a new rotating-structure was introduced to detect local residual stress and in-plane deflection in thin cold-rolled sheet of copper alloy.
在专用试验台上模拟残余应力释放，用应变仪和工具显微镜同时测量转动结构对应的应变和变形量输出，标定结果显示转动结构对残余应变检测灵敏度为0.49μm/10-6、相对偏差%，与FEM计算结果相吻合。
In this paper, the deep drawing process of sheet is simulated based on solid elements of LS-DYNA finite element software, the stress-strain fields of sheet are obtained from the simulation and the stress and str...
基于连续介质力学及有限变形理论，借助于计算机仿真技术，利用LS-DYNA软件中的实体单元模拟了低碳钢板深冲成筒形件的过程，得到了薄板在冲压成形过程中的应力应变场，并分析了板料各区域的受力变形情况，发现了凸凹模圆角处薄板沿厚度方向的应力应变分布并不均匀，这些模拟结果对筒形工件的深冲压加工具有一定的指导意义。
In micro stretch forming experiments using thin sheet copper and aluminum, stress and strain distribution are investigated.
另外本文通过对薄铜板及薄铝板进行胀形实验，找出了在微细胀形加工中，薄铜板及薄铝板的应力应变变化规律，并对这一规律进行理论分析。
In this paper waterproof sheet material and geotextile were compounded and used as stress absorbed layer, which was applied in composite pavement.
讨论了采用防水卷材与土工织物组成复合物作为应力吸收层应用于复合路面，对路面荷载应力的分析。
At the same time, counterforce, displacement and axial stress of a section on the nodes of BHA are listed in the form of sheet, which provides a basis on studying the fatigue life of BHA.(4) Based on mechanical analysis of BHA, fracture mechanics is used to discuss the stress intensity factor.￡, and the critical stress intensity factorKir of the opening crack propagation mode.
在BHA力学分析的基础上，应用断裂力学知识讨论了张开型裂纹的应力强度因子和断裂韧性，并应用形状改变能判据对构件屈服区进行了渐进分析，扩展了线弹性断裂力学的应用范围。
It had also analyzed the influence of process parameters on temperature field and stress- strain field. The stress- strain field induced by the forming of doubly curved surface was calculated using large-deformation elastic FEM to make sheet-metal form better comply with the object shape. Scanning paths of heat source were designed, including spherical-crown and saddle-shaped surfaces. The mechanisms of edge effects induced in the experiments had been discussed and the solutions were brought forward to form the proper sheet metals through forming experiments and numerical analysis.
为定量描述等离子体弧作用下金属板材的传热规律和应力应变状态，在重点研究了模型选取、移动热源模拟、材料特性和载荷施加等问题的基础上，建立了等离子体弧柔性成形过程的瞬态温度场有限元模型和应力应变场热弹塑性有限元模型；对温度场分布、应力应变状态以及形变规律进行了计算和分析，得出了在各种参数组合条件下的薄板温度场和应力应变场。
The research based on experiments of six reinforced concrete beams strengthened against shear damage. During the research we developed special devices to stress U style stirrup of carbon fiber sheet, and compared deflection, cracks, ultimate load of RC beams in which some was strengthened by prestressed U style stirrup of carbon fiber sheet and the other was strengthened by non-prestressed U style stirrup. I generally analyzed the effectiveness of the prestressed strengthening method on the working performance of RC beams.
本文进行了6根钢筋混凝土受剪梁的试验研究，自行研制了对碳纤维布U形箍施加预应力的方法和装置，对比了预应力碳纤维布U形箍加固的钢筋混凝土受剪梁与非预应力碳纤维布U形箍加固的钢筋混凝土受剪梁的挠度、裂缝、极限荷载等工作性能，分析了碳纤维布施加预应力对这些工作性能的影响。
The results show that the flexible and thin tube sheet can effectively reduce the temperature difference stress, which is brought by the difference in te.
Nastran有限元软件对废热锅炉进行了应力分析；详细分析了挠性薄管板的应力强度，结果表明，该挠性薄管板结构能有效地减小管壳程由于膨胀差而引起的温差应力；在管、壳程温差为54℃，膨胀差为2。
Simultaneously also discussed the tunnel tunneling machine tubing sheet material lining work stress and each load computational method; Establishes its mechanics model using the finite element analysis, and through the computation, proved tubing sheet material the lining work intensity to be enough.
同时也讨论了隧道掘进机管片衬砌的受力和各种载荷的计算方法；利用有限元分析建立其力学模型，并通过计算，论证了管片衬砌的强度足够。
Based on the analytical solution of stress field around the center crack in an infinite sheet, the normal stress distribution model was established on the cracked cross section for tensile thin-walled member.
首先根据无限大中心裂纹板在I型荷载作用下应力分布的近场奇异解，构建薄壁杆件在均匀拉伸时沿裂纹所在截面的正应力的分布模型；然后利用平衡条件确定无量纲应力强度因子；从而建立了一种求解含中心裂纹薄壁杆件应力强度因子的面场分析近似方法。
Taking this as a base and combining correlation analysis method of digital image frequency domain, photodynamics experimental study is made for displacement field of tri-point curved beam interface of CFRP strengthening concrete, and the relation curve, between shear stress and slippage, of plastering head end of carbon fibre sheet material.
以此为基础，结合数字图像频域分析法对CFRP加固混凝土三点弯梁界面位移场进行光力学试验研究，得到了碳纤维片材粘贴端部界面剪应力与滑移量之间的关系曲线。
In this technique, the stress distribution on releasing CFRP sheet is very complicated.
预应力碳纤维布加固混凝土结构技术是一种加固效果明显、应用前景广阔的加固技术，在施工工艺中放张预应力碳纤维布时各部分的受力是非常复杂的。
It is hard to make an analysis of the temperature field and stress field in the tube sheet and cylinder of a waster heat boiler owing to asymmetric arrangement of the heat exchange tube.
废热锅炉换热管分布的不对称性，使得管板和筒体等部件的温度场与应力场分析十分困难。
Under concentrated load, using finite element method, deflection of beams at center of span, and load-stress, load-strain of steel bar and CFRP sheet are analyzed for RC simply supported beams strengthened with different types of CFRP sheet. At one time, we also calculate deflection of beams at center of span under line load.
用有限元软件ADINA分析了集中荷载作用下矩形梁、T形梁在不同粘结方式时梁的跨中挠度、钢筋与碳纤维布的荷载—应力、荷载—应变关系，并将计算结果与试验结果进行了对比，分析产生误差的原因；同时对均布荷载作用下T形梁的跨中挠度进行了计算。
This method uses the features of laser such as high-speed heating and cooling to implement scribing treatment on the oriented steel sheet surface so as to promote the generation of micro plastic deformation and high-density dislocation in its heated section, form the subcrystalline boundary, reduce its main domain wall length, and introduce residual tensile stress so obtaining the effects of refining magnetic domain and reducing iron loss.
降低硅钢片铁损的激光处理方法及装置。$该方法是利用激光快速加热和冷却的特点，对取向硅钢片表面做划线状处理，促使加热区产生微小塑性变形和高密度位错，形成亚晶界，减小主畴壁长，同时引起残余张应力，达到细化磁畴，降低铁损的效果。
The adhesive strength between rubber and synthetic fiber texlile was increased effectively by chemically treating the surface of synthetic fiber and adding tackfier to the compound; As the fabric wrapped bladder was shaping, the sheet was symmetric, the joint elimated effectively stress concentration; The whole quality of the fabric wrapped bladder was increased by the new technology that was sh.
采用橡胶的共混技术设计出满足特殊要求，综合性能优良的胶料配方；通过对合成纤维表面进行化学处理，同时在胶料中加入增粘剂有效提高了橡胶与合成纤维织物的粘合强度；夹布胶囊成型时贴片对称，搭接头均布能有效地消除应力集中：采用中温操作成型、高温硫化新工艺，提高了夹布胶囊的整体质量。
The analysis is based on elastic theory and makes use of the formula for calculating anchorage shear stress of steel sheet.
在弹性理论的基础上，利用钢板锚固剪应力计算公式，对在集中荷载或均布荷载作用下采用粘钢加固的混凝土梁，分析钢板锚固最大剪应力的有关影响因数。
With the wide application of adhesive bonding structure of steel sheet and aluminum alloy sheet in automotive body, 3D elastic-plastic finite element model is used to analyze the stress distribution in adhesive joints under tension and shear load, as well as the effect of aluminum alloy sheet thickness and adhesive layer thickness on it.
针对汽车车身中应用日益广泛的钢板与铝合金板胶接结构，通过三维弹塑性有限元模型，分析其在承受拉剪载荷时接头内的应力分布，以及铝合金板厚度和胶层厚度对应力分布的影响。
In this thesis, finite element analysis is performed for bonded composite patch repair of a centre cracked aluminum sheet to reduce the stress intensity factor at the crack tip, and the minimum volume of composite patch is obtained through an optimization process.
中文摘要本研究是以有限元素法计算具有一中央裂缝的铝合金平板、以复材补片修补后之裂缝尖端的应力强度因子，并经由最佳化方法找出最小体积的补片尺寸。