scholarly journals Residual Stress Measurement on a MEMS Structure With High-Spatial Resolution

2007 ◽  
Vol 16 (2) ◽  
pp. 365-372 ◽  
Author(s):  
Neus Sabate ◽  
Dietmar Vogel ◽  
Astrid Gollhardt ◽  
Jrgen Keller ◽  
Carles Cane ◽  
...  
Keyword(s):  
Residual Stress ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Stress Measurement ◽  
Residual Stress Measurement

AL7N01 Butt Joint Welding Residual Stress Measurement by Ultrasonic Method

2012 ◽  
Vol 468-471 ◽  
pp. 476-479
Author(s):  
Zi Qi Ma ◽  
Xue Song Liu ◽  
Yi Cheng ◽  
Liang Zhang ◽  
Jian Gang Shi ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Field ◽  
Spatial Resolution ◽  
Stress Measurement ◽  
Ultrasonic Method ◽  
Differential Method ◽  
Welding Residual Stress ◽  
Residual Stress Measurement ◽  
Hole Drilling ◽  
Residual Stress Field

Analysis the shortage of ultrasonic stress measurement based on Lcr wave in low spatial resolution. Point out it is inapplicable in measuring gradient stress field like welding residual stress field. In this paper, propagation differential method is proposed to solve the low spatial resolution problem on Lcr wave stress measurement, and its theory is introduced. This method can raise the spatial resolution from tens of millimeter to a several millimeter level with out decline the stress resolution. A welding residual stress field of 7N01 aluminum alloy butted joint plate is measured by this method, and its result is compared with hole drilling method. Source of errors is discussed. It is seen that propagation differential method is applicable in welding residual stress measurement.

Noise-insensitive contour method for residual stress measurement in laser butt welding

2021 ◽  
Vol 165 ◽  
pp. 107861
Author(s):  
Hao Jiang ◽  
Junjun Liu ◽  
Zhenkun Lei ◽  
Ruixiang Bai ◽  
Zhenfei Guo ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Measurement ◽  
Residual Stress Measurement ◽  
Contour Method ◽  
Butt Welding

Analysis of Eddy-Current Measurement System for Residual Stress Assessment in Stainless Steel Grade 304

2015 ◽  
Vol 659 ◽  
pp. 623-627 ◽  
Author(s):  
Cherdpong Jomdecha ◽  
Isaratat Phung-On
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Eddy Current ◽  
Measurement System ◽  
System Analysis ◽  
Stress Measurement ◽  
Steel Grade ◽  
Current Measurement ◽  
Residual Stress Measurement ◽  
Stress Assessment

The objective of this paper is an analysis of statistical discreteness and measurement capability of an eddy-current measurement system for residual stress assessment in stainless steel Grade 304 (SS304). Cylindrical specimens with 50 mm in diameter and 12 mm thickness were prepared to generate residual stress by Resistance Spot Welding at which the welding currents were set at 12, 14, and 16 kA. The eddy-current measurement system was including a probe with frequency range of 0.1 to 3 MHz and an eddy current flaw detector. They were performed by contacting the probe on the specimen. The measurements were performed particularly in the vicinity of heat affected zone (HAZ). In order to determine the results of the residual stress measurement, the calibration curves between static tensile stress and eddy current impedance at various frequencies were accomplished. The Measurement System Analysis (MSA) was utilized to evaluate the changed eddy-current probe impedance from residual stress. The results showed that using eddy current technique at 1 MHz for residual stress measurement was the most efficient. It can be achieved the Gauge Repeatability & Reproducibility %GR&R at 16.61479 and Number of Distinct Categories (NDC) at 8. As applied on actual butt welded joint, it could yield the uncertainty of ± 58 MPa at 95 % (UISO).

Residual stress measurement on welded specimen by neutron diffraction

2004 ◽  
Vol 155-156 ◽  
pp. 1171-1177 ◽  
Author(s):  
Man Jin Park ◽  
Hee Nam Yang ◽  
Dong Y. Jang ◽  
Jong Sung Kim ◽  
Tae Eun Jin
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Stress Measurement ◽  
Residual Stress Measurement
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