Effect of elasto-plastic material behaviour on determination of residual stress profiles using the hole drilling method

2016 ◽  
Vol 51 (8) ◽  
pp. 572-581 ◽  
Author(s):  
Sergey Chupakhin ◽  
Nikolai Kashaev ◽  
Norbert Huber
Keyword(s):  
Residual Stress ◽  
Plastic Material ◽  
Hole Drilling ◽  
Material Behaviour ◽  
Hole Drilling Method ◽  
Drilling Method ◽  
Stress Profiles

Hole-Drilling Method for Residual Stress Measurement - Consideration of Elastic-Plastic Material Properties

2013 ◽  
Vol 768-769 ◽  
pp. 174-181 ◽  
Author(s):  
David von Mirbach
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Yield Stress ◽  
Material Properties ◽  
Plastic Material ◽  
Hole Drilling ◽  
Hole Drilling Method ◽  
Drilling Method ◽  
Elastic Plastic Material ◽  
Ring Core

Two commonly used mechanical methods for the determination of residual stresses are the hole-drilling method and the ring-core method, which can be regarded as semi-destructive. The most restricting limitation for the general applicability of both methods, according to the current state of science and technology, is the fact that the scope for relatively low residual stress under 60% of the yield stress is limited.This is a result of the notch effect of the hole or ring core, which leads to a plastification around and on the bottom of the hole and ring shaped groove already at stresses well below the yield stress of the material. The elastic evaluation of the resulting plastic strains leads consequently to an overestimation of the delineated residual stresses. In this paper the influence of elastic-plastic material properties no the specific calibration function for the hole-drilling method using the differential method is studied, and the method of adaptive calibration functions is presented.

An account of plasticity in the hole-drilling method of residual stress measurement

1995 ◽  
Vol 30 (3) ◽  
pp. 227-233 ◽  
Author(s):  
M Beghini ◽  
L Bertini ◽  
P Raffaelli
Keyword(s):  
Residual Stress ◽  
Stress Measurement ◽  
Plastic Material ◽  
Yield Criterion ◽  
Residual Stress Measurement ◽  
Hole Drilling ◽  
Plane Stress Condition ◽  
Elastic Plastic ◽  
Hole Drilling Method ◽  
Drilling Method

The elastic-plastic stress-strain field produced in a thin plate under equibiaxial loading during the operation of drilling a through-thickness hole was analysed. The plane stress condition and Tresca yield criterion were assumed for an elastic-perfectly plastic material. These hypotheses allowed the problem to be formulated by means of ordinary differential equations which were analytically solved. Within these particular conditions, the results gave indications of the effect produced by plasticity on the widely used hole-drilling method for residual stress measurement. In particular, the equality of final results with those obtained for a plate with a pre-existing hole loaded in an elastic-plastic regime gives useful indications for the experimental analysis of the effect of plasticity on residual stress measurement.

scholarly journals Experimental application of contour method for determination of residual stress in subsurface layers of milled sample

2012 ◽  
Vol 60 (5) ◽  
pp. 79-88
Author(s):  
Karel Horák ◽  
Michal Černý ◽  
Petr Dostál
Keyword(s):  
Residual Stress ◽  
High Speed ◽  
Diffraction Method ◽  
Sample Surface ◽  
Contour Method ◽  
Hole Drilling ◽  
Laboratory Equipment ◽  
Hole Drilling Method ◽  
Drilling Method

Determination of residual stress close to the sample surface is in the most cases performed by hole-drilling method, X-Ray diffraction or neutron diffraction. Each of these methods has its benefits and disadvantages. In case of diffraction methods the measurement speed is the main disadvantage. It is also very problematic to apply diffraction method in case of sample with mechanically deformed surface, for example by standard machining operations. Therefore, determined results are very often confusing and hard to interpret. On the other side, hole drilling method is less sensitive to quality of sample surface than diffraction methods, but measurement realization is quite expensive and equipment demanding (strain gage rosettes, miniature milling cutter, high speed milling machine, pc equipment,…).Recently introduce contour method used for determination of residual stress inside the sample is very fast, can be performed with almost common laboratory equipment and combines traditional stance with modern numerical methods by FEM. Contour method was selected for determination of residual stress below the milled surface and the dependency of milling process quality on residual stress value is demonstrated.

Measurement of Residual Stresses Near the Surface Using the Crack Compliance Method

1991 ◽  
Vol 113 (2) ◽  
pp. 199-204 ◽  
Author(s):  
W. Cheng ◽  
I. Finnie ◽  
O¨. Vardar
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Computational Model ◽  
Strain Measurement ◽  
Stress Measurement ◽  
Residual Stress Measurement ◽  
Hole Drilling ◽  
Hole Drilling Method ◽  
Drilling Method

The use of thin cuts for residual stress measurement is referred to as the crack compliance method. A computational model is presented for the determination of normal and shear residual stresses near the surface by introducing shallow cuts. The optimum regions for strain measurement are obtained. This method is shown to be considerably more sensitive than the conventional hole drilling method and is capable of measuring residual stresses which vary with depth below the surface.

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