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Strength of Dissimilar Metal Bonds and its Nondestructive Evaluation

异种金属键强度及其无损评价

基本信息

批准号：
04452282
负责人：
KATO Hiroshi
金额：
$ 3.84万
依托单位：
Saitama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452282/
关键词：
Diffusion Bonding Bonding Strength Fatigue Strength Nondestructive Testing Ultrasonic Testing Mild Steel Titanium Sub-Space Method ニッケル

项目摘要

Diffusion bonding were carried out with mild steel/nickel and mild steel/titanium in air, and static and fatigue strengths were obtained. The ultrasonic measurement was also carried out to evaluate these strengths and bonding character. Following results were obtained.(1) The shear fracture occurred in static shear test, and the transverse fracture in the thickness direction of the specimen occurred in the fatigue shear test. The shear strength was in proportion to the square of the diameter of the bonded region estimated by the ultrasonic measurement, but no correlation existed between the fatigue life and the estimated diameter. The fatigue limits of the mild steel/Ni and mild steel/Ti diffusion bonds agreed well with that of the steel bonds.(2) The initiation and extension of the fatigue crack in a single specimen of the steel/Ni bonds was monitored nondestructively by using the relation between the echo intensity ratio and the crack depth, which showed the usefulness of the ultrasonic monitoring of the fatigue crack extension.(3) With the steel bonds with grooves, primary and secondary components were derived from spectra of the ultrasonic wave by using the sub-space method, and these components changed with the groove spacing. The shear strength was evaluated with the estimated diameter and the primary and secondary components.(4) In the case of the mild steel/Ti diffusion bonds, the spectrum of the ultrasonic wave reflected from the bonding interface changed with existence of melted layr at the bonding interface. The shear strength was quantitatively evaluated with the ultrasonic paramenters : the estimated diameter and two components derived from the response function of the ultrasonic spectrum by using the sub-space method.

在空气中进行扩散连接与低碳钢/镍和低碳钢/钛，并获得静态和疲劳强度。并通过超声波测试来评价其强度和粘接性能。获得了以下结果。(1)静态剪切试验中试样发生剪切断裂，疲劳剪切试验中试样发生沿厚度方向的横向断裂。剪切强度与超声测量的结合区直径的平方成正比，但疲劳寿命与超声测量的结合区直径无关。低碳钢/Ni和低碳钢/Ti扩散连接的疲劳极限与钢连接的疲劳极限一致。(2)利用超声回波强度比与裂纹深度的关系，对钢/镍粘结单试样疲劳裂纹的萌生和扩展进行了非破坏性监测，表明超声监测疲劳裂纹扩展的有效性。(3)采用子空间法对带槽粘结剂的超声波频谱进行了分析，得到了随槽间距变化的主分量和次分量。用估计的直径和主要和次要成分评价剪切强度。(4)对于低碳钢/钛扩散连接，当连接界面上存在熔化层时，连接界面反射的超声波频谱发生变化。用超声参数定量评价剪切强度：估计的直径和两个分量来自超声频谱的响应函数，使用子空间方法。