The use of X-ray diffraction measurements to determine the effect of bending loads on internal stresses in aluminum inclusions embedded in a unidirectional graphite-fibre/PMR-15 composite

Benedikt, B.; Predecki, Paul; Kumosa, L.; Armentrout, D.; Sutter, J. K.; Kumosa, M.

doi:10.1016/s0266-3538(01)00105-1

Cited by 22 publications

(42 citation statements)

References 12 publications

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“…Benedikt et al subsequently compared with the residual stresses from the CLPT. It has been shown in this study that the residual interlaminar thermal stresses can be accurately determined not only in unidirectional graphite/polyimide systems as presented in [1] and [2], but also in woven graphite polymer matrix composites.…”

mentioning

confidence: 82%

“…Because of its practical importance, the problem of developing, measuring, and minimizing residual stresses has been addressed by many authors [1][2][3][4][5][6][7][8][9][10][11]. Predecki and Barrett [9][10][11] showed that it was possible to use the X-ray diffraction (XRD) method to measure the state of strain in aluminum, silver, and niobium inclusions embedded in the polymer matrix of a graphite/epoxy composite system.…”

mentioning

confidence: 99%

“…The problem of properly extracting the residual thermal stresses in unidirectional graphite/polymer composites from XRD strains in embedded silver and aluminum inclusions has been recently addressed and thoroughly discussed in [1]. The methodology developed in [1] has been further veri ed by performing XRD measurements of residual strains in Al inclusions embedded in the polyimide matrix of a unidirectional graphite/PMR-15 composite subjected to four-point bending conditions [2]. It was shown that the residual strains in the inclusions increased linearly with applied strain generated by a four-point bend xture used during the XRD tests.…”

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confidence: 99%

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Determination of Interlaminar Residual Thermal Stresses in a Woven 8HS Graphite/PMR-15 Composite Using X-Ray Diffraction Measurements

Benedikt¹,

Rupnowski²,

Kumosa³

et al. 2002

Mechanics of Advanced Materials and Structures

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This work is a continuation of the research recently presented in [1] and [2] on the determination of residual thermal stresses in graphite/polyimide composites with and without externally applied bending loads. In the previous work [1, 2] a combined experimental and numerical methodology for the determination of the residual stresses in unidirectional graphite/PMR-15 composites based on X-ray diffraction (XRD) measurements of residual strains in embedded aluminum (Al) and silver (Ag) inclusions has been presented. In this research, the previously developed approach has been applied to evaluate the residual thermal interlaminar stresses in an 8 harness satin (8HS) woven graphite/PMR-15 composite. First, residual thermal stresses have been measured by XRD in aluminum inclusions embedded between the rst and second plies of a four-ply 8HS woven graphite/PMR-15 composite. The measurements have been conducted with the composite specimens subjected to four-point bending deformations. Second, viscoelastic computations of interlaminar residual stresses in the composite have been performed using classical laminated plate theory (CLPT) following the manufacturing procedure. Third, the residual strains and stresses in the inclusions have been numerically predicted using the viscoelastic Eshelby model for multiple spherical inclusions. Finally, the interlaminar residual stresses in the composite have been extracted from the XRD strains in the Al inclusions, again using the viscoelastic Eshelby model, and

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confidence: 82%

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confidence: 99%

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confidence: 99%

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Determination of Interlaminar Residual Thermal Stresses in a Woven 8HS Graphite/PMR-15 Composite Using X-Ray Diffraction Measurements

Benedikt¹,

Rupnowski²,

Kumosa³

et al. 2002

Mechanics of Advanced Materials and Structures

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“…The samples, cut into bars having dimensions 19 mm×17 mm×12 mm, were scanned by XRD [5][6][7][8][9] (D/ MAX-RB, RIGAKU Co. Japan). The stress values of samples were calculated automatically by program.…”

Section: Xrd Stress Analysis and Sem Observationmentioning

confidence: 99%

“…In order to obtain the stress value on testing surface [7,8] , it is necessary to measure lattice spacing dn of certain (HKL) planes paralleled with surface and dψ of same (HKL) planes being a angle of ψ with surface. When the angle ψ is measured, εψ should be in a planes structured by normal of sample surface and σφ orientation.…”

Section: Stress Formation Of Cao-al 2 O 3 -Sio 2 Glass-ceramic Systemmentioning

confidence: 99%

Effect of the cool system on internal stress of CaO-Al2O3-SiO2 glass-ceramic system

Xie

et al. 2007

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The samples were attained through altering the cooling system of producing glass-ceramics. The X-ray diffraction was used to test the stress value of different samples. The relation of the cooling system and internal stress were also investigated. The experimental results show that the stress of glass-ceramic had a close relation with starting cool temperature. Above 800 ℃, glass-ceramic could be accelerated cooling and did not bring stress. Temperature between 500 ℃ and 800℃ was an important temperature range of the formation of stress in glass-ceramic, in which the glass-ceramic stress would change obviously. Cool system was the key on how to control and eliminate internal stress in order to reduce the destroy of materials crated by internal stress. In addition, glass particles size increase, glass-ceramic stress increase in consequent.

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Understanding residual stresses in polymer matrix composites

Shokrieh

Safarabadi

2021

Residual Stresses in Composite Materials

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The use of X-ray diffraction measurements to determine the effect of bending loads on internal stresses in aluminum inclusions embedded in a unidirectional graphite-fibre/PMR-15 composite

Cited by 22 publications

References 12 publications

Determination of Interlaminar Residual Thermal Stresses in a Woven 8HS Graphite/PMR-15 Composite Using X-Ray Diffraction Measurements

Determination of Interlaminar Residual Thermal Stresses in a Woven 8HS Graphite/PMR-15 Composite Using X-Ray Diffraction Measurements

Effect of the cool system on internal stress of CaO-Al2O3-SiO2 glass-ceramic system

Understanding residual stresses in polymer matrix composites

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