Hole-Drilling Method for Measuring Residual Stresses

Schajer, G. S.; Whitehead, Philip S.

doi:10.2200/s00818ed1v01y201712sem001

Cited by 39 publications

(25 citation statements)

References 65 publications

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“…Equation (1) shows the mathematical relationship between the interior residual stresses and the measured strains, while the distribution of residual stresses is non-uniform through the depth of material. 32 …”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Experimental investigation of cooling conditions, MWCNTs and mandrel diameter effects on the thermal residual stresses of multi-layered filament-wound composite pipes

Amir-Ahmadi

Ghasemi

2020

Journal of Composite Materials

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This study employs numerical and experimental approaches to analyze effects of various filament-winding parameters, including mandrel diameter and cooling conditions, on the process-induced thermal residual stresses of composite and nanocomposite pipes. Simultaneous effects of the addition of multi-walled carbon nanotubes (MWCNTs) and the cooling conditions were also analyzed in detail. To accomplish this aim, a few composite and nanocomposite cylinders with various diameters in different cooling conditions were produced using filament-winding process and experimented. The incremental hole-drilling method using an integral inverse solution was employed for measuring the curing-induced residual stresses. The experimental findings confirm that using MWCNTs for reinforcing the matrix, choosing a slow cooling condition, and increasing the diameter generate less residual stresses during the process. Moreover, this study clearly showed that the addition of MWCNTs decreases the sensitivity of the structure to the effects of cooling conditions during the curing process. Therefore, finding optimum amounts of MWCNTs and cooling rate leads to the minimum cost of fabrication.

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Section: Methodsmentioning

confidence: 99%

“…On the other hand, while the strain response is measured experimentally at a limited number of separate hole-depths, this equation is represented in terms of continuous functions. Therefore, for solving this Equation, equation (1) can be recast in the discrete form: 32 where…”

Section: Methodsmentioning

confidence: 99%

Experimental investigation of cooling conditions, MWCNTs and mandrel diameter effects on the thermal residual stresses of multi-layered filament-wound composite pipes

Amir-Ahmadi

Ghasemi

2020

Journal of Composite Materials

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“…In any case, "thick" workpieces are less sensitive to the plasticity effect. This is due to the presence of material in the lower part of the blind hole determining a local reinforcement and reducing the stress concentration factor [3]. This explains the higher measurement limit in the case of a blind hole (80% of σ Y ) compared to the case of a through hole (50% of σ Y ).…”

Section: Local Plasticity Limitation: Description and Possible Correcmentioning

confidence: 99%

“…Hole-drilling measurements can be performed in metal, composite and polymer materials [2]. The method also allows the test to be performed in different conditions, both in a laboratory and on field [3,4].…”

Section: Introductionmentioning

confidence: 99%

Recent Advancements in the Hole-Drilling Strain-Gage Method for Determining Residual Stresses

Valentini¹,

Bertelli²,

Benincasa³

et al. 2020

New Challenges in Residual Stress Measurements and Evaluation

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The hole-drilling Strain-Gage method is a widely used and cost-effective technique for the evaluation of residual stresses. The test method is standardized by ASTM E837-13a, which defines the scope, measurement range, minimum requirements of instrumentation, test procedure, and algorithms and coefficients for the computation of uniform and non-uniform stress distribution. However, the standardized test method presents some limitations regarding the scope and measurement range; moreover, some typical errors involved in the measurements are not taken into account, i.e., errors due to the hole eccentricity, the local plasticity, the intermediate thickness, and the hole-bottom chamfer, which can affect the results in some cases. Also, the standard does not provide the user with a complete guide regarding the evaluation of the uncertainty connected with this type of measurement. The paper presents a more general approach that allows the correction of some errors and overcomes and some limitations of the ASTM E837-13a test method, contributing to greater accuracy of the test results.

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“…In addition, the standardised type B rosette assembles its three gauges in the same quadrant, as shown in Figure 1, with the intention to be attached close to edges or defects. 13 A question raises about the applicability of coefficients obtained for a flat model in a hole-drilling test performed near a defect, for example, rounded corner, weld seam or free surfaces. Here, the focus is put on the former situation.…”

Section: Introductionmentioning

confidence: 99%

Application of the hole-drilling method for the evaluation of residual stresses near rounded ends

Alegre

Díaz

Cuesta

et al. 2019

The Journal of Strain Analysis for Engineering Design

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The experimental measurement of residual stresses by the hole-drilling method is a versatile technique due to its great simplicity. The technique consists of drilling on a material surface and measuring the relieved deformation on the surface by means of strain gauge rosettes. The most widespread method to obtain residual stresses from relieved deformation is the integral method and is found in the ASTM E837-13a standard. The procedure is standardised for very specific conditions, which are based on the application of the technique on a large flat-plate. To apply this technique to situations outside the standard scope, it is necessary to perform studies that validate its applicability. One of these situations is to evaluate the stresses introduced in hot- or cold-rolled profiles, where the residual stresses are concentrated on the rounded corners generated by rolling operations. In this study, a numerical simulation by finite elements has been carried out to obtain the relieved deformations for the case of drilling near rounded ends. The results show that the hole-drilling technique is applicable for the case of rounded ends; however, there is a significant deviation from the flat-plate condition which can be minimised by considering new matrices for the specific rounding radius and thickness of the analysed workpiece.

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Hole-Drilling Method for Measuring Residual Stresses

Cited by 39 publications

References 65 publications

Experimental investigation of cooling conditions, MWCNTs and mandrel diameter effects on the thermal residual stresses of multi-layered filament-wound composite pipes

Experimental investigation of cooling conditions, MWCNTs and mandrel diameter effects on the thermal residual stresses of multi-layered filament-wound composite pipes

Recent Advancements in the Hole-Drilling Strain-Gage Method for Determining Residual Stresses

Application of the hole-drilling method for the evaluation of residual stresses near rounded ends

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