共查询到19条相似文献,搜索用时 109 毫秒
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简述了木材无损检测的几种主要方法,介绍了该技术在木材加工及保护方面的应用,展望了未来木材检测技术的发展趋势。 相似文献
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王清波 《中国新技术新产品》2019,(14)
手持显微镜是当前红木家具木种无损检测中的重要应用设备,检测人员通过应用手持显微镜获取红木家具木材的基本特征,然后对红木家具不同部位进行取样,这样能获取较多数据。通过手持显微镜对木材进行拍照时,还可以在具体拍照位置添加水或是柏油,这样能提升拍照图像清晰度。 相似文献
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由于科学社会的不断发展与进步,人们对无损检测机构的质量要求越来越高,而无损检测机构也是社会十分重视的,因为它影响着无损检测机构的投入融资和经济效益,所以要不断的提高无损检测机构的质量管理,要把对无损检测机构的质量管理作为首要任务。随着无损检测机构的不断发展,无损检测机构的质量管理方式也在不断的改革,在新的改革中把无损检测机构的质量放在了首位,虽对此进行了一些改革措施,但依然不能避免一些问题的发生,所以要重视对无损检测机构的质量管理,这有这样才可以确保产品质量获得有效的控制,从而不断加强无损检测本身的质量。 相似文献
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通过对应用于建筑钢结构行业中的几种常规无损检测方法的简述,归纳了被检对象所适用的不同无损检测方法。为广大工程技术人员和管理人员了解、学习、应用无损检测技术提供参考。 相似文献
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《中国新技术新产品》2017,(5)
随着科学技术的发展与进步,无损检测技术被广泛应用在各个领域中,尤其是航空装备方面,可以保证装备的可靠安全运行,满足适航性的要求,创设良好的经济效益。当前航空工业对无损检测的要求越来越高,需要提倡新的无损检测思路及其理念,这对无损检测技术在航空装备中的研究与应用提供了有利条件,有利于实现基于信息化、图像化、数字化的绿色无损检测技术的发展。本文就对航空装备无损检测技术现状及未来趋势进行分析和探讨。 相似文献
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近年来工程检测技术和检测仪器设备的新发展,表明我国工程检测技术取得了很大的进展;也反映了工程检测技术与工程建设的发展相适应的状况。无损检测技术广泛应用于材料和产品的静态动态检测和质量管理方面。笔者简要的提出几种无损检测技术在混凝土质量检测中的应用。 相似文献
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In the field of pavement engineering, the need to rapidly and economically obtain properties of soils and materials has given rise to the development of many non-destructive techniques. Portable light-weight deflectometers (PLWD) are relatively new deflection-based tools. As a consequence, the main factors influencing the quality of the results obtained using such a tool are still being investigated. Therefore, through finite element modelling and experimental measurements, this research focussed on the stress distribution and stress variability under a PLWD loading plate and how it is influenced by stress level, plate diameter, rubber mat use and rubber hardness. It was shown that the stress distribution factor used for the calculation of elastic modulus from deflection testing is significantly influenced by the loading plate diameter. Moreover, the use of a harder rubber mat was found to be better, but no significant effect was observed for bonded rubber mat conditions. 相似文献
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搅拌摩擦焊接件内部残余应力无损测试研究进展 总被引:1,自引:0,他引:1
搅拌摩擦焊是近年来发展的一种新型焊接技术,目前国内主要着力于搅拌摩擦焊工艺及应用方面的研究,但由于测试方法和相关设备的限制,关于搅拌摩擦焊接件内部残余应力的研究几乎是空白,而国外利用其先进的中子衍射和高能同步辐射装置已经开展了较多搅拌摩擦焊接件内部残余应力的无损测试。综述了近10余年来国外搅拌摩擦焊接件内部残余应力测试的研究进展,讨论了影响残余应力测试结果的各种因素;最后介绍了国内用短波长X射线衍射仪测试材料内部残余应力的探索,对未来准确、高效、经济而无损地测试搅拌摩擦焊接件内部残余应力的研究方向进行了展望。 相似文献
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The Use of a Second Harmonic Correlation to Detect Damage in Composite Structures Using Thermoelastic Stress Measurements 总被引:2,自引:0,他引:2
Abstract: A novel development of the thermoelastic stress measurement technique using the second harmonic of the load test frequency is presented. Clear identification of significant sub-surface damage is demonstrated using the new technique, and test results are presented from a small scale wind turbine blade test which indicate that some quantitative assessment of damage criticality might be possible from a single full-field measurement. A hypothesis is presented as to why the new technique is successful, based on complex movements of the surface caused by local buckling (itself a consequence of the sub-surface damage). Strain gauge evidence is presented to support this hypothesis. 相似文献
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阐述水电站进水压力钢管安全检测与评估的内容和方法,结合安砂水力发电厂工程实例,通过外观检测、腐蚀状况检测、超声波检测、材质检测、结构应力有限元分析与计算、应力检测一系列的检测方法,对安砂水力发电厂的进水压力钢管进行全面的安全检测和评估。 相似文献
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介绍国内外各种复合材料损伤的无损检测技术,对其应用在军用飞机复合材料构件损伤检测的优势和局限性进行分析和探讨.电阻抗检测方法具有设备小型化、抗干扰能力强、检测速度快、可靠性高等特点,适用于军用飞机复合材料构件损伤的外场原位检测,具有良好应用前景,是复合材料构件外场原位检测研究的重点. 相似文献
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In a previous paper [3], the authors presented large sample optimum accelerated test plans to estimate the survival probability at a design stress assuming a linear logistic model, i.e. a linear relationship between stress and the log survival odds at that stress. The optimum plans required testing at two accelerated stresses with a larger allocation of units assigned to the lower of the two stresses. In practice, however, it is often desirable to conduct the accelerated tests at more than two stresses and/or use equal or otherwise prespecified allocation. In this paper we compare the large sample variance of each of ten such non-optimum test plans (and also that of testing exclusively at the design stress) with that of the optimum plan under a variety of conditions. 相似文献
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Non-destructive testing (NDT) detects damage according to a difference in a physical phenomenon between a normal structure and damaged structure. As a solution avoiding human errors in NDT, a numerical method based on a dynamical numerical analysis model and a structural optimization algorithm was proposed. This method automatically derives a structure with a response that is equal to that of a damaged structure through an optimization procedure. Among structural optimization methods, topology optimization can optimize the structure fundamentally by changing the topology and not just the shape of a structure. Thus, topology optimization is employed together with eigenfrequency analysis, which is the most fundamental methodology of NDT. The proposed method derives a structure that has the same eigenfrequencies as a damaged structure employing topology optimization. The shape and location of damage can be identified through the optimal shape obtained. 相似文献