内斜螺母对螺栓承载能力影响的研究

采用PRO/E3.0参数化建模,ANSYS WORKBENCH 10.0进行有限元分析,利用MATLAB对标准螺栓螺杆和内斜螺母螺栓螺杆的计算结果分别做了对比分析,确定了内斜螺母的最优内斜角.     

轮辋螺栓螺母与垫圈结构

我公司是专业生产装载机、平地机、拌和机、轮式挖掘机等驱动桥的厂家，在多年给主机厂配套生产的过程中发现，驱动桥与轮辋辐板联接所用的轮辋螺栓、螺母、垫圈有多种结构。     

高强度螺栓疲劳强度可靠性设计

本文根据金属裂纹扩展理论对高强度螺栓的疲劳断裂过程进行分析,提出了一种估计螺栓疲劳寿命的方法,由此方法,我们能够根据给定的可靠度和疲劳寿命设计螺栓的尺寸。     

螺栓联接疲劳强度的提高

螺栓联接是一个超静定（静不定）系统，其中各零件所受载荷的分配情况取决于系统中零件的相对刚度。普通结构的螺栓联接系统，由于螺栓、螺母固有的问题，如截面突变、刚性较大等，应力集中非常严重。尤其对于承受重载的重要螺栓联接，更是一个值得注意的问题。这些螺栓主要承受交变应力，破坏形式多为疲劳破坏。为了改善螺栓联接的应力集中状况，提高其疲劳强度，实际应用时可从以下几方面考虑：一、改变螺母及螺栓的结构，以提高系统的柔度普通螺母柔性差，与螺栓联接处各圈螺纹上的载荷分布很不均匀，应力集中严重（见图1），尤其对于图1…     

螺栓螺母通用画法的比例值

针对六角头螺栓和螺母两种标准零件的比例画法，对现行的比例画法进行了讨论，指出了现行画法中的误差，给出了通用画法的尺寸确定方法，为在计算机绘图中比较准确地绘制六角头螺栓和螺母提供了画法依据。     

螺栓联接疲劳强度的模糊可靠性设计

根据模糊概率设计理论,初步探讨了螺栓联接疲劳强度的模糊可靠性设计原理和方法,并给出了设计实例。     

螺栓螺母在3D软件中的装配方法的研究

以UG为载体,用几种不同的方法,详细介绍机械设计中螺栓、螺母的装配方法,这些装配方法,也可以应用于其他机械设计的3D软件。     

轮盘和螺栓预紧力对车轮疲劳强度的影响

根据UIC510-5标准,使用单轴疲劳准则对辐板非孔区域进行分析,应用Crossland和Dang Van多轴疲劳准则分析定位销安装孔和螺栓孔的疲劳强度,分析结果表明:制动盘的安装使辐板孔区域、辐板与轮毂过渡区域,以及辐板与轮辋过渡区域的最小安全系数增大;螺栓预紧力由47.62k N增大至64.94k N,车轮辐板各区域的安全系数变化较小;相对于Crossland准则,使用Dang Van多轴疲劳准则评定辐板孔区域疲劳强度得到的安全系数较小;车轮辐板区域最小安全系数为1.17,其疲劳强度满足要求。     

BP神经网络在高强度螺栓疲劳试验设计中的应用

阐述了BP神经网络的结构模型和算法，并由此建立了BP神经网络在高强度螺栓疲劳试验设计中的应用模型。最后，得到的仿真结果表明，它对试验改进措施具有指导意义。     

球磨机筒体中空轴处连接螺栓疲劳强度的可靠性设计

对球磨机筒体中空轴连接螺栓进行失效分析，载荷分布计算、应力分布分析，进而确定疲劳强度可靠度计算方法，并结合实例计算说明本设计方法可靠，具有推广应用价值。     

一种提高螺栓连接强度的有效方法

介绍提高螺栓连接强度的一般方法，提出一种通过增加钢套的简单方法以增大螺栓的柔度，从而提高螺栓连接强度；并从降低螺栓应力幅方面说明该方法能提高螺栓连接强度，运用能量的方法分析其提高螺栓连接抗冲击的原理。     

高强度螺栓连接的节点计算探析

为了解决高强度螺栓连接的节点计算这一难题,在研究了有关规范和国外资料后,提出了适用于没有垂直或水平支撑的梁的端部高强度螺栓连接的选取和节点计算的方法。     

基于零件强度衰减的螺栓抗挤压疲劳可靠性分析研究

螺栓联结是机械系统中常见的结构,联结螺栓通常要受到联结装置接触面的挤压,从而导致螺栓接触面压溃失效,螺栓的失效是其抗挤压强度可靠性下降到一定程度的体现。结合机械零件强度衰减理论分析了螺栓抗挤压强度可靠性随时间的下降的过程,最后通过举例验证了这一结论。     

Predicting the fatigue strength of structural elements

The development of models relating the fatigue strength of materials to their static strength and plasticity is considered. Statistical strength theories were developed to describe the results of fatigue tests and to predict the strength of machine components with variable loads. Experiments show that the strength of materials depends significantly on structural defects, and the limiting stress is a statistical quantity.     

Effects of structure and defect on fatigue limit in high strength ductile irons

In this paper, the influence of several factors such as hardness, internal defect and non-propagating crack on fatigue limits was investigated with three kinds of ductile iron specimens. From the experimental results the fatigue limits were examined in relation with hardness and tensile strength in case of high strength specimens under austempering treatment; in consequence the marked improvement of fatigue limits were not showed. The maximum defect size was an important factor to predict and to evaluate the fatigue limits of ductile irons. And, the quantitative relationship between the fatigue limits (σ _w ) and the maximum defect sizes ( $\sqrt {area} _{\max } $ ) was expressed as $\sigma _w ^n \cdot \sqrt {area} _{\max } = C_2 $ . Also, it was possible to explain the difference for the fatigue limits in three ductile irons by introduction of the non-propagating crack rates.     

Influence of soft surface modification on rolling contact fatigue strength of machine element

Various surface modification methods have been employed in order to improve the tribological performance of machine elements. In this work, electroless Ni–P alloy plating and sulfurizing treatments were employed, and the surface modified steel rollers and ball bearings were fatigue-tested under a pure or free rolling contact condition. The fatigue lives of both rollers and bearings were improved by these surface modifications. The contact pressure and subsurface stresses of the surface modified rollers and bearings were analyzed. The reason why the rolling fatigue strengths of surface modified rollers and bearings were higher than those of the non-coated ones would be due to the smaller contact pressure and subsurface stresses by the smaller elasticity as well as the conformity of the plated layer.     

风力机塔架螺栓强度分析系统设计

把面向对象的思想与螺栓强度分析相结合,设计了风力机塔架螺栓强度分析系统.采用交互式数据输入方式,可以对螺栓静强度以及疲劳强度进行分析计算,并将分析结果以数据的形式输出,为设计提供技术支持与参考.