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自增强反应管残余应力的测试 总被引:1,自引:1,他引:0
介绍一种用X射线法测试自增强反应管残余应力的方法,并将试验结果与常用的镗削法加以比较,结果表明X射线法可以用于自增强管体的残余应力测试。 相似文献
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介绍了一种X射线应力测试新技术,基于X射线衍射原理与影像板平面探测器背反射几何,推导出应力测试基本公式,并列举了应用实例.结果证实,该方法具有测试速度快及结果可靠等优点. 相似文献
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等应力片形试样设计及应力松弛测试装置 总被引:1,自引:0,他引:1
根据ASTME328-78设计了等应力的片形应力松弛测试试样,对其应力松弛测试装置进行了初步探索,并进行了应力松弛测试试验研究。 相似文献
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本文介绍了一种无损测试板件焊接残余应力的方法。给出径向残余应力的计算公式、测试步骤及注意事项。 相似文献
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先用X射线衍射法再用盲孔法测定了同一试样的残余应力,对测试结果进行了分析比较。结果表明:对于残余应力分布不随深度改变的情况,两者结果一致;但对于其他情况,两种方法得到的结果不一致。通过测试残余应力沿试样深度的分布和从原理上比较两种测试方法的不同,得出盲孔法的测试结果受深层残余应力分布影响,而X射线衍射法的测试结果不受其影响。 相似文献
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附加载荷下介质爆破特性的全息动光弹试验研究 总被引:1,自引:0,他引:1
冬瓜山矿的矿体埋深大 ,因而存在高应力 ,并且各向应力不均衡。为了指导将来冬瓜山矿的爆破优化工作 ,利用自行改造的加载设备和动光弹模拟试验装置 ,研究了不同高应力条件下的介质爆破特性。研究表明 ,介质在高应力条件下其强度有所增大 ,因此爆破时应适当增加炸药单耗 相似文献
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疲劳损伤件中温热等静压后的疲劳性能试验研究 总被引:1,自引:1,他引:0
对40Cr调质试样先进行了0.6N(N为全寿命)拉-拉疲劳试验,再中温热等静压,在随后的继续拉-拉疲劳试验中,发现其数据分散度降低,疲劳寿命大幅度提高,经分析,认为其主要原因是,中温热等静压使试样表面硬度增加,残余压应力提高,约束并减缓了随后继续疲劳试验时损伤区微裂纹的发展。 相似文献
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Significant errors in interpreting the results of the centre-hole technique may arise where test conditions deviate from a uniform uniaxial low-level stress field. This paper demonstrates that where the stress field varies linearly with depth, the as-measured stress represents the stress at one-quarter hole depth. In cases where surface preparation for strain gauging has induced residual stress or where stress levels are sufficiently high to induce plasticity during hole forming, simple formulae are proposed to correct for these effects. 相似文献
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Narottam P. Bansal 《Materials Science and Engineering: A》1996,220(1-2):129-139
Unidirectional CVD SiC (SCS-6) monofilament reinforced BaOAl2O32SiO2(BAS) glass—ceramic matrix composites have been fabricated by a tape lay-up method followed by hot pressing. The glass matrix flows around fibers during hot pressing resulting in nearly fully dense (95–98%) composites. Strong and tough composites having first matrix cracking stress of 250–300 MPa and ultimate flexural strength as high as 900 MPa have been obtained. Composite fracture surfaces showed fiber pullout with no chemical reaction at the fiber/matrix interface. From fiber push out, the fiber/matrix interfacial debond strength and the sliding frictional stress were determined to be 5.9 ± 1.2 MPa and 4.8 ± 0.9 MPa, respectively. The fracture surface of an uncoated SiC (SCS-0)/BAS composite also showed fiber/matrix debonding, fiber pullout, and crack deflection around the fibers implying that the SiC fibers may need no surface coating for reinforcement of the BAS glass-ceramic. Applicability of micromechanical models in predicting the first matrix cracking stress and the ultimate strength of these composites has also been examined. 相似文献