When the pumping area cannot approach the disk had aperture , the concentrated tensile stress appears near the edge of disk hard aperture , while the disk is pumped full aperture the surface exhibits compressive stress , and center is tensile stress which is lesser 当抽运光斑未充满激光介质时，介质的表面靠近边缘处会出现大的拉应力集中，并且介质中最大拉应力和表面的最大轴向位移随抽运光斑尺寸缩小面增大；而当抽运光充满介质时，表面是压应力，较小的拉应力存在于介质内部。
Under the promise of the practical applica tion an frugality , we determined the formula of sfpc and the stud y range . according to principle of damage mechanics , we deduced one axis tensile - compressive stress - strain relations and numeral fitt ing results with the finite element method . with experiment curve and stress - strain curve , we prove theorization method is practical 根据损伤力学原理建立了材料单轴抗拉一抗压本构模型，并应用有限元软件对其进行了数值拟合，通过实验曲线、本构模型曲线之间的关系，证明了理论推导方法的可行性。
Trued cylindricity and enhanced fitting configurations in major bearing areas reduce stretching and greatly increase chain life . our unique shot - peened surface layer , with residual compressive stress considerably improves fatique properties . kmc is a leading manufacturer of bicycle , motorcycle , automobile and industrial transmission chains Kmc桂盟集团是全球居领导地位的自行车摩托车汽车和工业传输链条制造商，工业传动事业部经营产品项目包含标准链条皮带马达非标链条皮带轮传动配件轮同步轮链轮扭力限制器联轴器减速机等。
Using the angle between orientation of maximum principal compressive stress and strike of source - faults , the vertical seal and open features of source - faults in the end of yimin stage sedimentary period ( the main oil gas accumulation period ) are studied , showing that the source faults in the central area are poorly sealed and well opened in vertical direction and ant the main migration pathway of oil gas generating and expelling from the source rock of nantun formation 利用最大主应力方向与源断裂走向之间夹角大小，对贝尔凹陷布达特群源断裂在主要成藏期伊敏组沉积末期的垂向封闭与开启性进行了研究，得到了贝尔凹陷布达特群源断裂在凹陷中部垂向封闭性差，开启程度高，是南屯组源岩生成排出油气向布达特群运移的主要输导通道这一认识。
As we know , concrete structures in reality are always under various stresses or with microcracks of different width . so in this paper , compressive stress tensile stress and microcracks are introduced into water permeability and carbonation experiment , with the object to study the relationship between those factors and durability indexes . sem xrd and mip methods were also used to study the relevant mechanisms 由于实际工程中的混凝土结构均承受不同类型的荷载和带有不同宽度的微裂缝，故本文考虑选取外荷载引起的压应力对普通混凝土渗透性的影响，弯曲应力对砂浆、净浆碳化深度的的影响以及在带有裂缝状态下水泥基材料的渗透和自愈现象开展了部分实验研究，同时通过对混凝土、砂浆及净浆系列水泥基试件的碳化和渗透实验比较，从微观角度对碳化和渗透、自愈现象的一些机理也做了初步研究。
According to the effective field expression which has been derived in former , the phenomenon that the tangential component of magnetic leakage field has maximum value and the normal component of magnetic leakage field acquires zero value at the stress concentration zone of positive magnetostriction ferromagnetism materials under the application of tensile stress and negative magnetostriction ferromagnetism materials under the application of compressive stress is explained theoretically through analyzing and discussing 根据所得到的地磁场中受力铁磁性材料有效场表达式，通过分析讨论，解释了受拉力作用的正磁致伸缩铁磁材料和受压力作用的负磁致伸缩材料在应力集中处漏磁场切向分量出现最大值、同时法向分量为零值的现象。
In order to reveal load mechanism and failure mode of thick pile caps , by means of the test of 1 / 4 - scale models of thick pile caps with six piles and post - handling study of 3 - dimensional non - linear finite element adina , this paper points out the shortage , which is that the design of pile caps is carried out by flexural strength in chinese technical code for building pile foundations jgj94 - 94 and american reinforcement concrete building construction code aci318 - 02 , promulgates that the failure mode of thick pile caps is punching failure and load transfer mechanism is the strut - and - tie , which is that zones of concrete with primarily unidirectional compressive stresses are modeled by compress struts , while tension ties are used to model longitudinal reinforcement over pile 摘要为揭示厚承台的传力机理和破坏形式，通过对4个1 : 5比例的六桩厚承台的模型试验研究与三维非线性有限元adina的后处理研究，指出中国建筑桩基技术规范jgj94 - 94与美国钢筋砼房屋建筑规范aci318 - 02规范中，承台以弯曲强度进行配筋计算的设计方法之不足，揭示出厚承台的破坏模式是冲切破坏，传力机理是以带有主要单向压应力的砼区域作斜压杆，桩顶区域的纵筋作拉杆的空间桁架。
By changing the negative bias current density , gaseous ratio and total pressure , nanocrystalline diamond film is prepared by ion - assisted bombardment method at the substrate temperature of 700 ? 00 ? and mixture gaseous of ch4 and h2 the effect of growth parameters on the diamond film is studied . the diamond film presents very low compressive stress and excellent field emission character 采用离子辅助轰击法，以ch _ 4 、 h _ 2为源气，衬底温度为700 900 ，通过改变衬底负偏压、 h _ 2和ch _ 4气体比例以及工作气压，制备出纳米金刚石薄膜，并对工艺参数对金刚石薄膜沉积的影响进行了研究。
The traditional level measuring methods can n ' t meet our demand because the subjective investigated is in such a poor systemic condition that the temperature is a little high and there ' s so many mill dust and steam there . in this article we perform systemic discuss and research against the dynamic level measuring method under special working condition on the basis of analyzing kinds of level measuring technique in and abroad . first we establish the pressure distribution mathematic model in storage bin and then deduce the mathematic relation between level height and the uniform stress on the bottom of the bin and designed a resistance compressive stress sensor used for the special condition and put forward a resoivement according to its zero excursion existing in practical use 由于本研究系统被测对象环境温度较高且潮湿，同时料仓中有大量粉尘及蒸汽，因此传统的料位检测方法不能满足本测试要求。本文在分析国内外各种物位检测技术的基础上，针对特殊工况下动态物料高度的检测进行了系统的探讨与研究。首先建立了料仓中的压力分布数学模型，推导出料位高度与仓底均布压力间的数学关系式，并据此设计了中温电阻应变式压力传感器，同时对它在实际应用中存在的零点漂移等问题提出了改进措施，提高了传感器性能，解决了上述特殊工况下动态物料检测的技术难题。
Based on the mechanism of shear - slipping dam collapse , the state function of high arch dam shear - slipping failure mode is established , and the function involves four non - fully - independent random variables , namely , compressive stress , shearing stress , coefficient of friction and coefficient of cohesion , and is of nonlinear characteristics 根据剪滑溃坝机理建立了高拱坝剪滑失效模式的状态函数，该状态函数包含压应力、切应力、摩擦系数以及粘结力系数等4个非完全独立的随机变量，且具有非线性特征。
