共查询到11条相似文献,搜索用时 46 毫秒
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Experimental Mechanics - Background: The non-conforming contact usually induce stress concentration as the interaction only occurs at a small interface. Theoretical and numerical investigations... 相似文献
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对两个有限长,外载荷又集中作用的圆拄体,在接触面上的应力分布是不均匀的.为了获得接触应力,本文应用弹性力学的理论、光弹性应力分析方法和有限元计算概念,提出了一种混合计算法.最后给出一个应用实例,讨论了某轧机轧辊的接触问题. 相似文献
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不考虑齿间啮合功率损失和挤压功率损失因素,直接使用实验的方法对单独运转的直齿轮进行搅油功率损失测定。首先,在对影响搅油功率损失的齿轮模数、齿数、齿宽、转速、没齿深度比以及润滑油的密度、粘度等多个参数进行研究的基础上,使用流体力学π定理得到直齿轮搅油功率损失普遍公式。然后进行了各种参数依次变化的分组实验,根据数据拟合计算确定了普遍公式中的待定系数,同时对直齿轮搅油的现象及各参数对搅油功率损失的影响进行了分析。结果表明,实验获得的拟合公式能在中低转速条件下有效预测搅油功率损失数值。本文结果可为后续一对齿轮啮合时的搅油功率损失计算与测定提供了理论基础和方法依据。 相似文献
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钻孔法测量残余应力过程中钻孔附加应变 总被引:3,自引:0,他引:3
本文叙述了钻孔法测量残余应力过程中的附加应变.研究应力水平对附加应变的影响是在单向应力条件下进行的,结果表明,钻孔条件、材料状态以及残余应力达到一定值时,附加应变为零. 相似文献
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本文应用弹塑性理论研究了被测试样的屈服强度、应力场对钻孔法测量残余应力过程中钻孔附加应变的影响,使用简化的理论模型推导了低速旋转钻头钻孔产生附加应变的一般表达式.结果表明钻孔引入的附加应变与被测试样的原始残余应力状态有关,随应力水平增加而增大,在压应力减小到某一临界值σ时,钻孔附加应变为零。在 Ly12铝合金上的实验测量结果与理论结果一致。 相似文献
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利用应变信号对齿轮传动装置进行故障诊断的实验研究 总被引:2,自引:0,他引:2
本文要用在轴承外圈套圈上拾取应变信号的方法对二级齿轮传动装置箱体所受的动态激励力进行了测试和分析,在此基础上对齿轮传动装置的轴系部件故障进行了准确的诊断。 相似文献
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Evaluation of stresses in structures such as bridges, buildings, pipelines and railways is challenging because the loads cannot easily be manipulated to allow direct measurements. This paper focuses on the development of a method that combines the hole-drilling technique with Digital Image Correlation (DIC) to evaluate these difficult-to-measure structural stresses. The hole-drilling technique works by relating local displacements caused by the removal of a small amount of stressed material to the original stresses within the drilled hole. Adaptation of this method to measure structural stresses requires scaling up the hole size and modifying the calculation approach to measure deeper into a material. DIC provides a robust means to measure full-field displacements that can easily be scaled to different hole sizes and corrected for typical artifacts that occur in practical on-site measurements. There are two primary areas of investigation: the adaptation of the DIC/hole-drilling method to measure structural stresses and the development of a correction method to remove coexisting stresses such as residual and machining stresses from the measurement. Experimental measurements are made to demonstrate the measurement method on different structure types including the example practical problem of measuring thermally induced stresses in railroad tracks. 相似文献
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六通换向阀是一种重要的流动换向设备,用整体设计的六通换向阀替代传统的多阀控制系统,完成在主、备用动力设备间的转换.有效提高了整个系统的安全性。针对六通换向阀的特性,设计建造了六通换向阀性能测试系统,着重介绍了该测试系统的结构组成、测试方法、及主要功能。在此基础上,选择32#汽轮机油为工作介质,对80JH-33和40JH-33两种口径的六通换向阀进行了各种工况下的阻力特性实验及稳定性和可靠性实验。实验研究表明,该测试系统设计合理、功能完善、测试准确可靠.可以模拟六通换向阀实际应用的各种工作状况。还可拓展用于其它类似设备的流动性能测试与实验研究。 相似文献
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S. J. Lewis S. Hossain J. D. Booker C. E. Truman U. Stuhr 《Experimental Mechanics》2009,49(5):637-651
Shear stresses along the shaft/hub interface in shrink-fit components, generated by torsional loads, can drive premature failure
through fretting mechanisms. It is difficult to numerically predict these shear stresses, and the associated circumferential
slip along the shaft/hub interface, due to uncertainties in frictional behaviour and the presence of steep stress gradients
which can cause meshing problems. This paper attempts to provide validation of a numerical modelling methodology, based on
finite element analysis, so the procedure may be used with confidence in fitness-for-purpose cases. Very few experimental
techniques offer the potential to make measurements of stress and residual stress interior to metallic components. Even fewer
techniques provide the possibility of measuring shear stresses. This paper reports the results of neutron diffraction measurements
of shear stress and residual shear stress in a bespoke test specimen containing a shrink-fit. One set of measurements was
made with a torsional load ‘locked-in’. A second set of measurements was made to determine the residual shear stress when
the torsional load had been applied and removed. Overall, measurement results were consistent with numerical models, but the
necessity for a small test specimen to allow penetration of the neutron beam to the measurement locations meant the magnitude
of shear stresses was at the limits of what could be measured experimentally. 相似文献