权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Non-Destructive Evaluation of Fatigue Properties of Diffusion Bonds

扩散键疲劳性能的无损评估

基本信息

批准号：
01460224
负责人：
YOSHIKAWA Keiji
金额：
$ 4.67万
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：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01460224/
关键词：
Diffusion Bonding Fatigue Strength Carbon Steel NDT Ultrasonic Test Speckle Correlation Method Bonding Strength Crack Propagation 変態超塑性平板

项目摘要

Shear and fatigue strengths of diffusion bonded steel plates were measured and the ultrasonic measurement was carried out to estimate a size of the bonded region. Then, origination and propagation of the fatigue crack was examined through the angle beam technique. Also, the speckle correlation method was used to examine a possibility of detection of fatigue damage. The following results were obtained :1. The shear strength of the diffusion bonds is proportional to a bonded area, and the size of bonded region was estimated by the ultrasonic measurement.2. The fatigue life of the diffusion bonds largely scattered, which was caused by difference of the bonding condition, and the size of the bonded region estimated by the ultrasonic measurement was dependent on the bonding condition. Therefore, the scatter of the fatigue life can be decreased by selection of the bonds through the ultrasonic measurement.3. The propagation direction of the initial crack was in good agreement with the direction of the principal shear stress calculated numerically. Cracks with the depth less than 0.2 mm (4% of the plate thickness) were detected by the ultrasonic measurement, and the size of the propagating crack was estimated with the reflected echo strength.4. Vibration of a plate was examined through the speckle correlation method, and the dynamic properties was measured and analyzed in situ, which assures that the deformation of the specimen can be measured in situ during the fatigue process by the speckle correlation method.

测量了扩散连接钢板的剪切强度和疲劳强度，并进行了超声波测量以估计连接区域的大小。然后利用角梁技术对疲劳裂纹的萌生和扩展进行了研究。此外，还使用散斑相关方法来检测疲劳损伤的可能性。得到了以下结果：1.扩散键的剪切强度与连接面积成正比，并通过超声波测量估算了连接区域的大小。扩散连接的疲劳寿命在很大程度上是分散的，这是由于连接条件的不同造成的，而超声测量估计的连接区域的大小取决于连接条件。因此，可以通过超声测量选择键来减小疲劳寿命的离散性。初始裂纹的扩展方向与数值计算的主剪应力方向吻合较好。通过超声检测发现深度小于0.2 mm(占板厚的4%)的裂纹，并用反射回波强度估计扩展裂纹的大小。利用散斑相关法对板的振动进行了检测，并对其动态特性进行了现场测量和分析，从而保证了利用散斑相关法可以现场测量疲劳过程中试件的变形。