Residual stress measurements on Al-graphite composites using X-ray diffraction

Tsai, Swe-Den; Mahulikar, Deepak; Marcus, Harris L.; Noyan, I. C.; Cohen, J. B.

doi:10.1016/0025-5416(81)90220-2

Cited by 62 publications

(10 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The half value depth, defined as the depth where the intensity of the X-ray is a half of the initial intensity, can be calculated to be about 16 µm for aluminum-base alloys. The calculated value is comparable to the X-ray penetration depth reported in the literature (~20 µm [5,34,35]).…”

Section: Necessity Of Surface Treatment Before Xrd Measurementssupporting

confidence: 87%

Strategy of Residual Stress Determination on Selective Laser Melted Al Alloy Using XRD

Chen

Sun

Li³

et al. 2020

Materials

View full text Add to dashboard Cite

Selective laser melting (SLM) is known to generate large and anisotropic residual stresses in the samples. Accurate measurement of residual stresses on SLM-produced samples is essential for understanding the residual stress build-up mechanism during SLM, while a dramatic fluctuation can be observed in the residual stress values reported in the literature. On the basis of studying the influence of surface roughness on residual stress measured using X-ray diffraction (XRD), we propose a procedure coupling XRD technique with pretreatment consisting of mechanical polishing and chemical etching. The results highlight that residual stresses measured using XRD on as-built SLM-produced samples with high surface roughness are significantly lower than those measured on samples with finished surface, which is due to the stress relaxation on the spiked surface of as-built samples. Surface distribution of residual stresses and the effect of scanning strategy were systematically investigated for SLM-produced AlSi10Mg samples. Microstructural morphology was observed at the interface between sample and building platform and was linked to the surface distribution of residual stresses. This procedure can help us accurately measure the residual stresses in SLM-produced samples and thus better understand its build-up mechanism during the SLM process.

show abstract

Section: Necessity Of Surface Treatment Before Xrd Measurementssupporting

confidence: 87%

Strategy of Residual Stress Determination on Selective Laser Melted Al Alloy Using XRD

Chen

Sun

Li³

et al. 2020

Materials

View full text Add to dashboard Cite

show abstract

“…Experim entally, residual stresses in composites can be inf erred from X -ray and neutron di raction measurements, as for example in the work of Tsai et al (1981), Krawitz et al (1988), A llen et al (1992) and Povirk et al (1992). What is measured, for both types of radiation, is the spacing between lattice planes (Warren 1969, Noyan andCohen 1987).…”

Section: Residual Strainsmentioning

confidence: 99%

A discrete dislocation analysis of residual stresses in a composite material

Cleveringa

1999

Philosophical Magazine A

View full text Add to dashboard Cite

A bstractResidual stresses and strains in a two-dimensional model composite consisting of elastic reinforcements in a crystalline matrix are analysed. The composite is subject to macroscopic shear and then unloaded. Plane-strain conditions and single slip on slip planes parallel to the shear direction are assumed. The dislocations are modelled as line defects in a linear elastic medium. A t each stage of loading, superposition is used to represent the solution in terms of the in® nite medium solution for the discrete dislocations and an image solution that enforces the boundary conditions, which is non-singular and obtained f rom a linear elastic ® nite-element solution. The lattice resistance to dislocation motion, dislocation nucleation and dislocation annihilation are incorporated into the f ormulation through a set of constitutive rules. Obstacles leading to possible dislocation pile-ups are also accounted for. Considerable reverse plasticity is found when the reinforcement arrangement is such that all slip planes are cut by particles and when the unloading rate is equal to the loading rate. When unloading takes place at a very high rate, the unloading slope is essentially elastic but relaxation of the dislocation structure occurs in the unloaded state. Predictions of the discrete dislocation formulation f or residual stresses, residual strains and the strain variance are compared with corresponding predictions obtained using conventional continuum slip crystal plasticity. The e ect of particle size, as predicted by the discrete dislocation description, is also addressed.

show abstract

“…Even though experimental determination of residual stress in composites is possible through X-ray diffraction (XRD) [25] , dilatometry, and acoustic methods, difficulties arise in measurement, which includes lowering the original value of residual stress due to relaxation processes taking place. Original residual stresses can be ascertained by the comparison of stress/strain curves of the matrix and the fibre.…”

Section: Thermal Stressesmentioning

confidence: 99%

The behaviour of aluminium matrix composites under thermal stresses

Dash

Sukumaran

Ray

2014

Science and Engineering of Composite Materials

View full text Add to dashboard Cite

The present review work elaborates the behaviour of aluminium matrix composites (AMCs) under various kinds of thermal stresses. AMCs find a number of applications such as automobile brake systems, cryostats, microprocessor lids, space structures, rocket turbine housing, and fan exit guide vanes in gas turbine engines. These applications require operation at varying temperature conditions ranging from high to cryogenic temperatures. The main objective of this paper was to understand the behaviour of AMCs during thermal cycling, under induced thermal stresses and thermal fatigue. It also focuses on the various thermal properties of AMCs such as thermal conductivity and coefficient of thermal expansion (CTE). CTE mismatch between the reinforcement phase and the aluminium matrix results in the generation of residual thermal stress by virtue of fabrication. These thermal stresses increase with increasing volume fraction of the reinforcement and decrease with increasing interparticle spacing. Thermal cycling enhances plasticity at the interface, resulting in deformation at stresses much lower than their yield stress. Low and stable CTE can be achieved by increasing the volume fraction of the reinforcement. The thermal fatigue resistance of AMC can be increased by increasing the reinforcement volume fraction and decreasing the particle size. The thermal conductivity of AMCs decreases with increase in reinforcement volume fraction and porosity.

show abstract

Residual stress measurements on Al-graphite composites using X-ray diffraction

Cited by 62 publications

References 4 publications

Strategy of Residual Stress Determination on Selective Laser Melted Al Alloy Using XRD

Strategy of Residual Stress Determination on Selective Laser Melted Al Alloy Using XRD

A discrete dislocation analysis of residual stresses in a composite material

The behaviour of aluminium matrix composites under thermal stresses

Contact Info

Product

Resources

About