无损检测广义可靠性及其研究方法

在地常规无损检测（ＮＤＴ）可靠性概念剖析的基础上,提出了ＮＤＴ广义可靠性的概念。针对影响ＮＤＴ广义可靠性的各类不确定因素,对广义可靠性研究的策略和途径进行了分析。重点介绍故障树分析、模糊综合评判以及可靠度类比分析等研究方法。     

无损检测可靠性与裂纹形成寿命探讨

检测方法的可靠性直接影响结构疲劳裂纹形成寿命估计值,提出一种利用的无损检测（ＮＤＴ）可靠性理论对疲劳试验结果进行修正的方法。     

RELATIONSHIP OF LENNARD－JONES POTENTIAL ANDMORSE POTENTIAL WITH W＿x（r） POTENTIAL

ＲＥＬＡＴＩＯＮＳＨＩＰＯＦＬＥＮＮＡＲＤ－ＪＯＮＥＳＰＯＴＥＮＴＩＡＬＡＮＤＭＯＲＳＥＰＯＴＥＮＴＩＡＬＷＩＴＨＷ＿ｘ（ｒ）ＰＯＴＥＮＴＩＡＬＸｉｅ，Ｙｏｕｑｉｎｇ（ＤｅｐａｒｔｅｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｅｉｎ...     

MAGNETIC PHASE TRANSITIONS AND MAGNETIC PROPERTIES OF Nd_3(Fe,Mo)_(29) COMPOUND AND ITS NITRIDE

ＭＡＧＮＥＴＩＣＰＨＡＳＥＴＲＡＮＳＩＴＩＯＮＳＡＮＤＭＡＧＮＥＴＩＣＰＲＯＰＥＲＴＩＥＳＯＦＮｄ３（Ｆｅ,Ｍｏ）２９ＣＯＭＰＯＵＮＤＡＮＤＩＴＳＮＩＴＲＩＤＥ①ＰａｎＨｏｎｇｇｅ,ＷａｎｇＸｉｎｈｕａ,ＣｈｅｎＹｕｎａｎｄＣｈｅｎＣｈａｎｇｐｉｎＤ...     

MAGNETIC PROPERTIES AND CRYSTALLIZATION BEHAVIOR OF AN AMORPHOUS（Fe＿（1－x）Mo＿x）＿（79）Si＿9B＿（13）ALLOY

ＭＡＧＮＥＴＩＣＰＲＯＰＥＲＴＩＥＳＡＮＤＣＲＹＳＴＡＬＬＩＺＡＴＩＯＮＢＥＨＡＶＩＯＲＯＦＡＮＡＭＯＲＰＨＯＵＳ（Ｆｅ＿（１－ｘ）Ｍｏ＿ｘ）＿（７９）Ｓｉ＿９Ｂ＿（１３）ＡＬＬＯＹＭＡＧＮＥＴＩＣＰＲＯＰＥＲＴＩＥＳＡＮＤＣＲＹＳＴＡＬＬＩＺＡＴＩ...     

COMPOSITION AND SPECTROSCOPIC STUDIES OF HYDRATED SODIUM ALUMINATE COMPOUNDS

ＣＯＭＰＯＳＩＴＩＯＮＡＮＤＳＰＥＣＴＲＯＳＣＯＰＩＣＳＴＵＤＩＥＳＯＦＨＹＤＲＡＴＥＤＳＯＤＩＵＭＡＬＵＭＩＮＡＴＥＣＯＭＰＯＵＮＤＳＱＩＵＧｕｏｆａｎｇ,ＤＥＮＧＨｏｎｇｍｅｉ,ＺＥＮＧＷｅｎｍｉｎｇａｎｄＣＨＥＮＨｉａｎｙｉ（ＳｈａｎｇｈａｉＩ...     

热轧微观组织的计算机模拟及性能预报(一)

热轧微观组织的计算机模拟及性能预报（一）赵辉鹿守理（北京科技大学，１０００８３）ＣＯＭＰＵＴＥＲＳＩＭＵＬＡＴＩＯＮＯＦＨＯＴ┐ＲＯＬＬＥＤＭＩＣＲＯＳＴＲＵＣＴＵＲＥＡＮＤＥＤＩＣＴＩＯＮＯＦＰＲＯＰＥＲＴＩＥＳＺｈａｏｈｕｉＬｕｓｈｏｕｌｉ（Ｕｎ...     

计算机辅助孔型设计（CARD）技术的应用与发展（三）

计算机辅助孔型设计（ＣＡＲＤ）技术的应用与发展（三）⒇赵俊萍鹿守理曲扬（北京科技大学压加系,１０００８３）ＴＨＥＡＰＰＬＩＣＡＴＩＯＮＡＮＤＤＥＶＥＬＯＰＭＥＮＴＯＦＴＨＥＴＥＣＨＮＯＬＯＧＹＯＦＣＯＭＰＵＴＥＲＡＩＤＥＤＲＯＬＬＤＲＡＵＧＨＴＩＮＧ...     

最新的全晶体管化（全固态）高频感应加热设备

最新的全晶体管化（全固态）高频感应加热设备ＡＮＥＷＬＹＤＥＶＥＬＯＰＥＤＦＵＬＬＹＴＲＡＮＳＩＳＴＯＲＩＺＥＤ（ＦＵＬＬＳＯＬＩＤＳＴＡＴＥ）ＨＩＧＨＦＲＥＱＵＥＮＣＹＩＮＤＵＣＴＩＯＮＨＥＡＴＩＮＧＦＡＣＩＬＩＴＹ辽宁电子设备厂采用ＳＩＴ、ＩＧＢＴ...     

ACTIVATION ENERGY OF FeAl ALLOYS DURING SUPERPLASTIC DEFORMATION

ＡＣＴＩＶＡＴＩＯＮＥＮＥＲＧＹＯＦＦｅＡｌＡＬＬＯＹＳＤＵＲＩＮＧＳＵＰＥＲＰＬＡＳＴＩＣＤＥＦＯＲＭＡＴＩＯＮ①ＬｉＤｉｎｇｑｉａｎｇ，ＬｉｎＤｏｎｇｌｉａｎｇ（Ｔ．Ｌ．Ｌｉｎ）ＴｈｅＰｕｂｌｉｃＬａｂｏｒａｔｏｒｙｏｆＨｉｇｈＴｅｍｐｅｒａｔｕ...     

无损检测可靠性的模糊定义及其检测概率分析

基于模糊集合理论,建立了在无损检测(NDT)可靠性分析中关于检测概率(POD)的模糊定义.引入半梯形和降岭形的隶属函数,并给出隶属度函数来描述缺陷尺寸与检测概率之间的模糊关系.在此基础上,采用NDT可靠性的对数正态格式,对检测概率进行了计算.     

无损检测模糊可靠度及缺陷模糊检出概率的分析计算

对影响无损检测可靠性的主要因素用模糊综合评判方法进行综合评判，并确定了无损检测模糊区上下限的值。在无损检测可靠度和缺陷检出概率的模糊定义基础上，将模糊集理论与概率统计分析相结合，对检测模糊可靠度和缺陷模糊检出概率进行分析计算。     

基于可靠性的裂纹检出概率曲线测定方法

裂纹检出概率(POD)曲线能够定量评价某种检测方法的裂纹检出能力,而且也是飞机制造商制定飞机结构维修方案的基础。准确测定裂纹检出概率曲线对保证航空结构的安全具有重要的意义。基于可靠性理论确定了测定POD曲线所需要的试验数据点数量、每个试验中裂纹尺寸的大小、最少有效检测次数等,给出了描述检测可靠性的裂纹检出概率曲线制定方法和程序。     

加入世贸组织后的我国无损检测

论述加入世贸组织（WTO）后,我国无损检测面临的挑战与机遇。为了增强制造工业的国际竞争力,无损检测将出现空前良好的机遇,必须抓住这一机遇,以发展新技术为主,实现技术的跨越,并提出在实施技术跨越发展时需要注意的若干方面。     

无损检测技术进展及其在压力容器安全评定中的作用

重点介绍当今无损检测（NDT）技术的研究进展,论述NDT技术在锅炉压力容器安全评定中的作用,提出了NDT现状技术的研究热点-NDT技术可靠性及其智能化定量技术,指出了NDT技术在锅炉压力容器安全评定中的几点发展趋势。     

焊接结构焊缝中缺陷参数不确定性处理方法

提出了含缺陷焊接结构中缺陷参数不确定性的工程处理方法.对于不同板厚、不同形状容器焊缝中的缺陷参数,可分别采用直接法、间接法以及考虑无损检测检出概率(POD)时缺陷参数不确定性的处理方法.同时对缺陷尺寸参数的分布规律与POD的定量关系进行了推论.     

Reliability assessment of manual ultrasonic time of flight diffraction (TOFD) inspection for complex geometry components

Experimental probability of detection (POD) and probability of sizing (POS) curves are developed for the detection and sizing of surface-breaking cracks in components having complex geometry. A manual ultrasonic time of flight diffraction (TOFD) inspection system has been used to develop these POD and POS curves. Initially, it was assumed and subsequently verified that signal responses have a normal distribution. The effects of probe angle and probe center-to-center spacing on both POD and POS were observed. Unlike the PODs previously reported for conventional ultrasonic amplitude based flaw sizing techniques, the PODs associated with TOFD in the range of defect sizes considered here, exhibit a decreasing trend for a fixed set of experimental parameters. It is important to emphasize that the curves obtained in this work are specific to the geometry, specimen dimensions, set of notches and the specific probes used in the experiment. However, when using a manual TOFD inspection system, these curves can be useful for planning the risk-based inspection of components having complex geometry (such as a steam turbine rotor shaft).     

磁偶极子理论在无损检测中的用途

文章阐述了磁偶极子理论在无损检测中的用途：①深化对缺陷漏磁场的认识。②理解磁性无损检测的物理基础。③获得磁性无损检测的基本规律。④阐明有悖于传统磁性无损检测原理的实验现象。⑤求出经典实验结果的解析表达式。⑥指导标准试件的正确设计。⑦为磁性无损检测提供新概念、新理论。⑧为创建磁性无损检测的“当量沟槽标准系统”奠定理论基础。所有这一切都是为了真正实现磁性无损检测的定量化和自动化。     

Reliability in NDT: ROC study of radiographic weld inspections

The complexity of modern NDT equipment as well as the demand for high reliability in many industries makes it necessary to have a tool to assess different NDT techniques and devices quickly. As for cost benefit considerations, a measure of accuracy has to include not only the number of correctly detected defects but also the corresponding number of false indications. In order to satisfy a variety of security demands this ratio of true and false indications must be known for a wide range of defect dimensions to be included in the defect count. This information will be provided by only one ROC (relative operating characteristic) study of inspection data using the rating confidence method. An expanded ROC version also yields an assessment of the accuracy of the defect classification and of the correctness of the indicated defect importance. All these measures of performance can also be called up for each individual inspector. For demonstrating the power of the method it is applied to ascertain the difference in detection performance of three distinct experimental modalities in the radiographic testing of welded joints. In order to be capable of drawing conclusions reliably, the study is completed by statistical significance tests. The paper shows the usefulness of ROC for performance assessment in NDT and gives an illustration of what can be done with which effort.