共查询到19条相似文献,搜索用时 93 毫秒
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2000m^3在役压力容器应力状况分析 总被引:2,自引:0,他引:2
本文报道了钢制2000m^3球罐实际运行一年后的应力状况,对球罐的残余应力及工作应力进行了现场测试,发现球罐虽经过整体热处理,但局部残余应力仍较高等问题,并进行了对比分析。 相似文献
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无损电测解析法测定焊接容器的残余应力 总被引:1,自引:1,他引:1
本文从塑性增量理论出发,论述了无损电测解析法的基本原理和应用此法确定残余应力的基本步骤,并将其应用大型球罐的现场测量。其特点是在容器例行的水压试验中只需应用电阻应变片测量应变即可确定残余应力用此法所得结果同盲孔法所得结果进行了对比。表明具有一定的工程精度。 相似文献
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高压聚乙烯装置用G4345V钢厚壁管冷弯残余应力检测 总被引:1,自引:0,他引:1
本文对某厂聚乙烯装置用G4345V钢厚壁管冷弯残余应力进行了检测.为寻求较适用的降低残余应力的方法,对弯管进行两种处理以后的效果进行了检验,二种处理工艺为热处理(370℃)及喷丸.最后在现场对喷丸前后的残余应力用磁各向异性探头进行了检测,证明该方法有很大的发展前途 相似文献
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激光反射全息干涉法现场测量残余应力的实验研究 总被引:1,自引:0,他引:1
本文根据激光反射干涉法的基本原理,采用钻盲孔释放残余应变的手段,提出一种新颖的残余应力激光全息现场测量的方法,推导出该光学测量方法3种计算公式.解决了激光全息干涉法不能进行现场实测的难题. 相似文献
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本文根据激光反射干涉法的基本原理,采用钻盲孔释放残余应变的手段,提出一种新颖的残余应力激光全息现场测量的方法,推导出该光学测量方法3种计算公式.解决了激光全息干涉法不能进行现场实测的难题. 相似文献
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15万立米气柜残余应力及工作应力测试分析 总被引:4,自引:2,他引:4
报导了15万立米大型煤气气柜挂圈走台的残余应力及气柜升降时工作应力的测试结果。该气柜服役十余年后发生煤气泄漏,为分析其原因,进行了残余应力及气柜修复前后的工作应力测试,结果表明:修复前残余应力及工作应力均达到很高水平,气柜升起时伴有严重侧偏现象,修复后应力状态有明显好转。 相似文献
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压力机焊接残余应力的状态分析 总被引:2,自引:0,他引:2
对 2000k N 及 1500k N 压力机焊后残余应力状态进行了测试分析,并对用振动法和热处理两种方法进行消除残余应力的效果进行了现场测试及对比分析。 相似文献
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接合残余应力对异种接合材料强度的影响很大,正确地分析接合残余应力在界面端附近的分布及其奇异特性,是研究异材强度评价方法的关键问题之一,本文利用弹性学中的Goursat公式和有关微分方程解的理论,求得了平面近似下的界面端附近的残余应力场及其应力奇异性,与单纯的外力作用时的情况不同,残余应力在界面端有可能出现对数型的应力奇异性,并且不能仅用Dunders的异材参数来描述。 相似文献
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高速客车转向架残余应力的试验研究 总被引:6,自引:0,他引:6
利用磁弹性这种新型的无损检测方法对高速客车转向架焊接构架组焊后的残余应力和构架在疲劳试验过程中的残余应力进行了试验研究,得到了构架残余应力随循环周次的变化规律 相似文献
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A. H. Mahmoudi S. Hossain C. E. Truman D. J. Smith M. J. Pavier 《Experimental Mechanics》2009,49(4):595-604
Mechanical strain relief techniques for estimating the magnitude of residual stress work by measuring strains or displacements
when part of the component is machined away. The underlying assumption is that such strain or displacement changes result
from elastic unloading. Unfortunately, in components containing high levels of residual stress, elastic-plastic unloading
may well occur, particularly when the residual stresses are highly triaxial. This paper examines the performance of one mechanical
strain relief technique particularly suitable for large section components, the deep hole drilling (DHD) technique. The magnitude
of error is calculated for different magnitudes of residual stress and can be substantial for residual stress states close
to yield. A modification to the technique is described to allow large magnitudes of residual stress to be measured correctly.
The new technique is validated using the case of a quenched cylinder where use of the standard DHD technique leads to unacceptable
error. The measured residual stresses using the new technique are compared with the results obtained using the neutron diffraction
technique and are shown to be in excellent agreement. 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
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The present study deals with the development and the application of the through-hole drilling method for the residual stress
analysis in orthotropic materials. Through a systematic theoretical study of the stress field present on orthotropic plates
with a circular hole, the relationships between the relaxed strains measured by a rectangular strain gauge rosette and the
Cartesian components of the unknown residual stresses are obtained. The theoretical formulas of each influence coefficient
allow the user an easy application of the method to the analysis of uniform-residual stresses on a generic homogeneous orthotropic
material. Furthermore, to extend the method to the analysis of the residual stresses on orthotropic laminates, caused by initial
in-plane loadings, an alternative formulation is implemented. The accuracy of the proposed method has been assessed through
3D numerical simulations and experimental tests carried out on unidirectional, cross-ply and angle-ply laminates. 相似文献
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Z-pin复合材料细观模型固化残余应力研究 总被引:1,自引:0,他引:1
针对植入Z-pin后碳纤维增强复合材料的微观结构,通过施加Z-pin周期性边界约束条件,建立了Z-pin复合材料单层板单胞细观模型.考虑固化过程中树脂体积收缩、弹性模量随固化度变化和纤维因Z-pin进入偏转因素,运用有限单元法计算了单胞结构在固化成型工艺过程中树脂和纤维应力发展和分布,并研究了Z-pin直径和分布密度对单层板面内残余应力的影响.结果表明:凝胶点之前,树脂模量和残余应力很小,凝胶点之后,树脂模量和残余应力增加较快;残余应力分布与纤维偏转有关;Z-pin直径和分布密度增加会使固化残余应力增大. 相似文献