Residual Stress Measurement and Modeling by the Initial Strain Distribution Method: Part II—Application to Cladded Plates with Different Heat Treatments

2004 ◽  
Vol 32 (3) ◽  
pp. 11891 ◽  
Author(s):  
M Beghini ◽  
L Bertini ◽  
R Valentini
Keyword(s):  
Residual Stress ◽  
Strain Distribution ◽  
Stress Measurement ◽  
Heat Treatments ◽  
Residual Stress Measurement ◽  
Initial Strain ◽  
Distribution Method

Modeling and Measuring Residual Stress in Autofrettaged Hollow Cylinders Through the Initial Strain Distribution Method

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Matteo Loffredo ◽  
Andrea Bagattini ◽  
Bernardo D. Monelli ◽  
Marco Beghini
Keyword(s):  
Residual Stress ◽  
Influence Function ◽  
Strain Distribution ◽  
Fe Simulation ◽  
Initial Strain ◽  
Experimental Setup ◽  
Fe Model ◽  
Distribution Method ◽  
Plastic Properties ◽  
Hollow Cylinders

The paper presents a method for modeling and measuring the residual stress (RS) field in axisymmetric autofrettaged elements. The method is based on the assumption that an Initial Strain Distribution (ISD), originated by the plastic strain previously induced during the autofrettage process, is the source of RSs. The ISD is the quantity to be evaluated and, after being determined, it can be used, by means of a dedicated finite element (FE) model, to evaluate the RS field in the component or in any part extracted from it. The ISD is obtained by elaborating the relaxed strains produced by cutting the autofrettaged component in incremental steps. The elaboration is based on solving a set of Fredholm's integral equations in which the unknown function is the ISD and the kernel is an Influence Function (IF) correlating the measured relaxed strain to the ISD. After a general discussion of the RS induced by the autofrettage and the effect of the plastic properties of the material under process, the methods for obtaining the relaxed strains by a rational experimental setup and the procedures for obtaining the IFs are presented and discussed. The whole methodology is applied to evaluate the RS field in a hollow cylinder for which the autofrettage was modeled by a FE simulation. The consistency of the method is verified and useful indications for the experimental activities were obtained.

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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