Measurement of residual stress in thick section composite laminates using the deep-hole method

Bateman, MG; Miller, OH; Palmer, Timothy J.; Breen, Cep; Kingston, E.; Smith, David J.; Pavier, Martyn J

doi:10.1016/j.ijmecsci.2005.06.011

Cited by 41 publications

(32 citation statements)

References 18 publications

(23 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The method is particularly suited to thick components. Some investigators [46] have developed an extension to the method to allow the measurement of residual stress in orthotropic materials such as thick laminated composite components.…”

Section: Deep Hole Methodsmentioning

confidence: 99%

Methods of measuring residual stresses in components

et al. 2012

View full text Add to dashboard Cite

Residual stresses occur in many manufactured structures and components. Large number of investigations have been carried out to study this phenomenon and its effect on the mechanical characteristics of these components.Over the years, different methods have been developed to measure residual stress for different types of components in order to obtain reliable assessment. The various specific methods have evolved over several decades and their practical applications have greatly benefited from the development of complementary technologies, notably in material cutting, full-field deformation measurement techniques, numerical methods and computing power. These complementary technologies have stimulated advances not only in measurement accuracy and reliability, but also in range of application; much greater detail in residual stresses measurement is now available. This paper aims to classify the different residual stresses measurement methods and to provide an overview of some of the recent advances in this area to help researchers on selecting their techniques among destructive, semi destructive and non destructive techniques depends on their application and the availabilities of those techniques. For each method scope, physical limitation, advantages and disadvantages are summarized. In the end this paper indicates some promising directions for future developments.

show abstract

Section: Deep Hole Methodsmentioning

confidence: 99%

Methods of measuring residual stresses in components

et al. 2012

View full text Add to dashboard Cite

show abstract

“…There are many methods for machining the over-core and include electro-chemical machining [7] and mechanical cutting using diamond tipped hole saws [20]. An effective process for metal components is electro-discharge machining.…”

Section: Experimental Techniquementioning

confidence: 99%

“…The application of the DHD technique was explored by Bateman et al [37] on a 22 mm thick carbon fiber-epoxy composite laminate. This work required the isotropic elastic analysis, given in Section 3.2, to be revised to permit the formation of a compliance matrix for orthotropic materials.…”

Section: Fibre Compositesmentioning

confidence: 99%

Deep Hole Drilling

Smith

2013

Practical Residual Stress Measurement Methods

View full text Add to dashboard Cite

The Deep Hole Drilling (DHD) method belongs to the class of mechanical strain relaxation techniques designed to measure stresses and residual stresses in materials. The technique described in this chapter is now used extensively to measure both applied and locked-in stresses in many manufactured engineering materials and components. Its origins as a technique rise from its use in rock mechanics [1,2]. The procedure involves drilling a pilot borehole into the rock to the depth required for stress measurement (Figure 3.1). A device, often called a strain cell, is inserted into the borehole and then pressurized to ensure good contact with the sides of the borehole or glued into the borehole. Then material surrounding the pilot borehole is then over-cored to relax the stresses in the surrounding rock, with the strain cell monitoring the relaxed strains. An elasticity analysis is then used to convert the strains to stresses. Rock mechanics practitioners also refer to using "soft or hard inclusion" analysis for determining the stresses from the strains measured, [2][3][4] with the analysis depending on the type of strain cell used. An example of its application in rock mechanics is provided by Martin and Christiansson [3]. They describe borehole and over-coring methods where the pilot hole was 38 mm diameter and the over-core diameter 96 mm.The process of introducing a pilot hole, inserting a strain cell and then over-coring has also been developed and applied to civil engineering structures, such as bridges and concrete constructions. Ryall [5] explains a "hard inclusion" method based on overcoring. A solid steel bar, representing the "hard inclusion", is bonded into the borehole using high-modulus cement grout. The steel bar is strain gaged to permit measurement of strains during over-coring. Borehole and over-core diameters were about 42 mm and Practical Residual Stress Measurement Methods, First Edition. Edited by Gary S. Schajer.

show abstract

“…For example the accuracy of the method has been enhanced by increasing the number of measurement angles from three to 18 [11,12]. There are many examples of the DHD technique being used to provide reliable results [13][14][15]. The DHD technique is particularly suitable for measurements in large components and examples exist where the technique has been used to measure stresses up to 500 mm below the surface [16].…”

Section: Introductionmentioning

confidence: 99%

A New Procedure to Measure Near Yield Residual Stresses Using the Deep Hole Drilling Technique

et al. 2008

View full text Add to dashboard Cite

Mechanical strain relief techniques for estimating the magnitude of residual stress work by measuring strains or displacements when part of the component is machined away. The underlying assumption is that such strain or displacement changes result from elastic unloading. Unfortunately, in components containing high levels of residual stress, elasticplastic unloading may well occur, particularly when the residual stresses are highly triaxial. This paper examines the performance of one mechanical strain relief technique particularly suitable for large section components, the deep hole drilling (DHD) technique. The magnitude of error is calculated for different magnitudes of residual stress and can be substantial for residual stress states close to yield. A modification to the technique is described to allow large magnitudes of residual stress to be measured correctly. The new technique is validated using the case of a quenched cylinder where use of the standard DHD technique leads to unacceptable error. The measured residual stresses using the new technique are compared with the results obtained using the neutron diffraction technique and are shown to be in excellent agreement.

show abstract

Measurement of residual stress in thick section composite laminates using the deep-hole method

Cited by 41 publications

References 18 publications

Methods of measuring residual stresses in components

Methods of measuring residual stresses in components

Deep Hole Drilling

A New Procedure to Measure Near Yield Residual Stresses Using the Deep Hole Drilling Technique

Contact Info

Product

Resources

About